Wednesday 29 October 2014

180 TOP Production Technology - Mechanical Engineering Multiple choice Questions and Answers

Latest Production Technology Questions and Answers List

1. Work study is concerned with
(a) improving present method and finding
standard time
(b) motivation of workers
(c) improving production capability
(d) improving production planning and control
(e) all of the above.
Ans: a
2. Basic tool in work study is
(a) graph paper
(b) process chart
(c) planning chart
(d) stop watch
(e) analytical mind.
Ans: d
3. What does symbol 'O' imply in work study
(a) operation
(b) inspection
(c) transport
(d) delay/temporary storage
(e) none of the above.
Ans: a
4. What does symbol 'D' imply in work study
(a) inspection
(b) transport
(c) delay/temporary storage
(d) permanent storage
(e) none of the above.
Ans: c
5. What does symbol 'V' employ in work study
(a) operation
(b) inspection
(c) delay/ temporary Storage
(d) permanent storage
(e) none of the above.
Ans: d
6. Material handling in automobile industry is done
by
(a) overhead crane
(b) trolley
(c) belt conveyor
(d) all of the above
(e) none of the above.
Ans: a
7. String diagram is used when
(a) team of workers is working at a place
(b) material handling is to be done
(c) idle time is to be reduced
(d) all of the above
(e) none of the above.
Ans: a
8. Work study is most useful
(a) where production activities are involved
(b) in judging the rating of machines
(c) in improving industrial relations
(d) in judging the output of a man and improving it
(e) where men are biggest contributor to success
of a project.
Ans: a
9. Micromotion study is
(a) enlarged view of motion study
(b) analysis of one stage of motion study
(c) minute and detailed motion study
(d) subdivision of an operation into therbligs and
their analysis
(e) motion study of small components upto mirco-
seconds.
Ans: d
10. In micromotion study, therblig is described by
(a) a symbol
(b) an event
(c) an activity
(d) micro motions
(e) standard symbol and colour.
Ans: e
11. The allowed time for a job equals standard time
plus
(a) policy allowance
(b) interference allowance
(c) process allowance
(d) learning allowance
(e) unforeseen allowance.
Ans: a
12. Micromotion study involves following number of
fundamental hand motions
(a) 8
(b) 12
(c) 16
(d) 20
(e) 24
Ans: c
13. The standard time for a job is
(a) total work content
(b) base time + relaxation time
(c) total work content + basic time
(d) total work content + delay contingency
allowance
(e) total work content + relaxation time.
Ans: d
14. Work study is done with the help of
(a) process chart
(b) material handling
(c) stop watch
(d) all of the above
(e) none of the above.
Ans: c
15. Scheduling gives information about
(a) when work should start and how much work
should be completed during a certain period
(b) when work should complete
(c) that how idle time can be minimized
(d) proper utilisation of machines
(e) none of the above.
Ans: a
16. Expediting function consists in keeping a watch
on
(a) operator's activity
(b) flow of material and in case of trouble locate
source of trouble
(c) minimising the delays
(d) making efficient despatching
(e) none of the above.
Ans: b
17. Choose the wrong statement Time study is
used to
(a) determine overhead expenses
(b) provide a basis for setting piece prices or
incentive wages
(c) determine standard costs
(d) determine the capability of an operator to
handle the number of machines
(e) compare alternative methods.
Ans: a
18. Job evaluation is the method-of determining
the
(a) relative worth of jobs
(b) skills required by a worker
(c) contribution of a worker
(d) contribution of a job
(e) effectiveness of various alternatives.
Ans: a
19. Micromotion study is
(a) analysis of a man-work method by using a
motion picture camera with a timing device in the
field of view
(b) motion study* observed on enhanced time
intervals
(c) motion study of a sequence of operations
conducted systematically
(d) study of man and machine conducted
simultaneously
(e) scientific, analytically procedure for
determining optimum work method.
Ans: a
20. Per cent idle time for men or machines is found
by
(a) work sampling
(b) time study
(c) method study
(d) work study
(e) ABC analysis.
Ans: a
21. TMU in method time measurement stands for
(a) time motion unit
(b) time measurement unit
(c) time movement unit
(d) technique measurement unit
(e) time method unit.
Ans: b
22. Time study is
(a) the appraisal, in terms of time, of the value of
work involving human effort
(b) machine setting time
(c) time taken by workers to do a job
(d) method of fixing time for workers
(e) method of determining the personnel
Requirement.
Ans: a
23. Work sampling observations are taken on the
basis of
(a) detailed calculations
(b) convenience
(c) table of random numbers
(d) past experience
(e) fixed percentage of daily production.
Ans: c
24. One time measurement unit (TMU) in method
time measurement system equals
(a) 0.0001 minute
(b) 0.0006 minute
(c) 0.006 minute
(d) 0.001 minute
(e) 0.06 minute.
Ans: b
25. Basic motion time study gives times for basic
motions in ten thousandths of
(a) second
(b) minute
(c) hour
(d) day
(e) none of the above.
Ans: b
26. Choose the wrong statement. Motion study is
used for
(a) improving a work method
(b) improvising a work method
(c) designing a work method
(d) providing a schematic framework
(e) reducing inventory costs.
Ans: e
27. Gnatt chart provides information about the
(a) material handling
(b) proper utilisation of manpower
(c) production schedule
(d) efficient working of machine
(e) all of the above.
Ans: c
28. ABC analysis deals with
(a) analysis of process chart
(b) flow of material
(c) ordering schedule of job
(d) controlling inventory costs money
(e) all of the above.
Ans: d
29. Process layout is employed for
(a) batch production
(b) continuous type of product
(c) effective utilisation of machines
(d) all of the above
(e) none of the above.
Ans: a
30. For a product layout the material handling
equipment must
(a) have full flexibility
(b) employ conveyor belts, trucks, tractors etc.
(c) be a general purpose type
(d) be designed as special purpose for a particular
application
(e) arranging shops according to specialization of
duties.
Ans: d
31. Travel charts provide
(a) an idea of the flow of materials at various
stages
(b) a compact estimate of the handling which must
be done between various work sections
(c) the information for changes required in
rearranging material handling equipment
(d) an approximate estimate of the handling which
must be done at a particular station
(g) solution to handling techniques to achieve
most optimum^ results.
Ans: b
32. Product layout is employed for
(a) batch production
(b) continuous production
(c) effective utilization of machine
(d) all of the above
(e) none of the above.
Ans: b
33. The most important objective behind plant
layout is
(a) overall simplification, safety of integration
(b) economy in space
(c) maximum travel time in plant
(d) to provide conveniently located shops
(e) to avoid any bottlenecks.
Ans: a
34. The process layout is best suited where
(a) specialisation exists
(b) machines are arranged according to sequence
of operation
(c) few number of non-standardised units are to be
produced
(d) mass production is envisaged
(e) bought out items are more.
Ans: c
35. A low unit cost can be obtained by following
(a) product layout
(b) functional layout
(c) automatic material handling equipment
(d) specialisation of operation
(e) minimum travel time plan and com¬pact layout.
Ans: a
36. Military organisation is known as
(a) line organisation
(b) line and staff organisation
(c) functional organisation
(d) all of the above
(e) none of the above.
Ans: a
37. The main disadvantage of line organisation is
(a) top level executives have to do excessive work
(b) structure is rigid
(c) communication delays occur
(d) all of the above
(e) none of the above.
Ans: d
38. The main advantage of line organisation is its
(a) effective command and control
(b) defined responsibilities at all levels
(c) rigid discipline in the organisation
(d) ability of quick decision at all levels
(e) all of the above.
Ans: e
39. Frederick W. Taylor introduced a system of
working known as
(a) line organisation
(b) line and staff organisation
(c) functional organisation
(d) effective organisation
(e) none of the above.
Ans: c
40. The salient feature of functional organisation is
(a) strict adherence to specification
(b) separation of planning and design part
(c) each individual maintains functional efficiency
(d) work is properly planned and distributed
(e) all of the above.
Ans: e
41. The most popular type of organisation used for
Civil Engineering Constructions is
(a) line organisation
(b) line and staff organisation
(c) functional organisation
(d) effective organisation
(e) none of the above.
Ans: a
42. Templates are used for
(a) a planning layout
(b) flow of material
(c) advancing a programme in automatic machines
(d) copying complicated profiles
(e) none of the above.
Ans: a
43. In steel plant the most important system for
materials handling is
(a) conveyors
(b) cranes and hoists
(c) trucks
(d) locos
(e) none of the above.
Ans: d
44. Routing prescribes the
(a) flow of material in the plant
(b) proper utilization of man power
(c) proper utilization of machines
(d) inspection of final product
(e) none of the above.
Ans: a
45. Queuing theory deals with problems of
(a) material handling
(b) reducing the waiting time or idle Jajme
(c) better utilization of man services
(d) effective use of machines
(e) none of the above.
Ans: b
46. Standard time is defined as
(a) normal time + allowances
(b) normal time + idle time + allowances
(c) normal time + idle time
(d) only normal time for an operation
(e) none of the above.
Ans: a
47. Father of industrial engineering is
(a) Jeck Gilberth
(b) Gnatt
(c) Taylor
(d) Newton
(e) none of the above.
Ans: b
48. The grouping of activities into organisational
units is called
(a) corporate plans
(b) higher level management
(c) functional authority
(d) departmentatidn
(e) company policy.
Ans: d
49. Which of the following organisation is preferred
in automobile industry
(a) functional organisation
(b) line organisation
(c) staff organisation
(d) line and staff organisations
(e) scalar organisation.
Ans: d
50. Which of the following organisations is best
suited for steel plants
(a) functional organisation
(b) line organisation
(c) staff organisation
(d) line, staff and functional organisations
(e) scalar organisation.
Ans: d
51. The wastage of material in the store is taken
into account by the following method in the
evaluation of the material issued from the store
(a) inflated system
(b) primary cost method
(c) current value method
(d) fixed price method
(e) variable price method.
Ans: a
52. Which of the following is independent of sales
forecast
(a) productivity
(b) inventory control
(c) production planning
(d) production control
(e) capital budgeting.
Ans: a
53. Gnatt charts are used for
(a) forecasting sales
(b) production schedule
(c) scheduling and routing
(d) linear programming
(e) none of the above.
Ans: b
54. Inventory management consists of
(a) effective running of stores
(b) state of merchandise methods of stroing and
maintenance etc.
(c) stock control system
(d) all of the above
(e) none of the above.
Ans: d
55. Gnatt charts provide information about
(a) break even point analysis
(b) production schedule
(c) material handling layout
(d) determining selling price
(e) value analysis.
Ans: b
56. Inventory control in production, planning and
control aims at
(a) achieving optimisation
(b) ensuring against market fluctuations
(c) acceptable customer service at low capital
investment in inventory
(d) discounts allowed in bulk purchase
(e) regulate supply and demand.
Ans: c
57. In inventory control, the economic order
quantity is the
(a) optimum lot size
(b) highest level of inventory
(c) lot corresponding to break-even point
(d) capability of a plant to produce
(e) none of the above.
Ans: a
58. Statistical quality control techniques are based
on the theory of
(a) quality
(b) statistics
(c) probability
(d) all of the above
(e) none of the above.
Ans: c
59. The appellate authority for an industrial dispute
is
(a) management
(b) labour court
(c) high court/supreme court
(d) board of directors
(e) president.
Ans: c
60. Under the Apprenticeship Act
(a) all industries have to necessarily train the
apprentices
(b) industries have to train apprentices ac-cording
to their requirement
(c) all industries employing more than 100 workers
have to recruit apprentices
(d) only industries employing more than 500
workers have to recruit apprentices
(e) all industries other than small scale industries
have to train apprentices.
Ans: d
61. Standing orders which are statutory are
applicable to
(a) all industries
(b) all process industries and thermal power plants
(c) only major industries
(d) only key industries
(e) all industries employing more than 100
workers.
Ans: e
62. Acceptance sampling is widely used in
(a) batch production
(b) job production
(c) mass production
(d) all of the above
(e) none of the above.
Ans: c
63. The technique of value analysis can be applied
to
(a) complicated items only
(b) simple items only
(c) crash programmer items only
(d) cost consciousness items only
(e) any item.
Ans: e
64. The term 'value' in value engineering refers to
(a) total cost of the product
(b) selling price of the product
(c) utility of the product
(d) manufactured cost of the product
(e) depreciation value.
Ans: c
65. Value engineering aims at finding out the
(a) depreciation value of a product
(b) resale value of a product
(c) major function of the item and accomplishing
the same at least cost without change in quality
(d) break even point when machine re-quires
change
(e) selling price of an item.
Ans: c
66. In the perpetual inventory control, the material
is checked when it reaches its
(a) minimum value
(b) maximum value
(c) average value
(d) alarming value
(e) original value.
Ans: a
67. According to MAPI formula, the old machine
should be replaced by new one when
(a) CAM < DAM
(b) CAM > DAM
(c) CAM = DAM
(d) there is no such criterion
(e) none of the above.
(CAM = Challenger's Adverse minimum DAM =
Defender's Adverse minimum)
Ans: a
68. Merit Rating is the method of determining worth
of
(a) a job
(b) an individual employee
(c) a particular division in workshop
(d) machine
(e) overall quality.
Ans: b
69. Material handling and plant location is analysed
by
(a) Gnatt chart
(b) bin chart
(c) Emerson chart
(d) travel chart
(e) activity chart.
Ans: d
70. Works cost implies
(a) primary cost
(b) factory cost
(c) factory expenses
(d) primary cost + factory expenses
(e) none of the above.
Ans: d
71. Motion study involves analysis of
(a) actions of operator
(b) layout of work place
(c) tooling and equipment
(d) all of the above
(e) none of the above.
Ans: a
72. Standard time as compared to normal time is
(a) greater
(b) smaller
(c) equal
(d) there is no such correlation
(e) none of the above.
Ans: a
73. Pick up the incorrect statement about
advantages of work sampling
(a) permits a fine breakdown of activities and
delays
(b) simultaneous study of many operators may be
made by a single observer
(c) calculations are easier, method is economical
and less time consuming
(d) no time measuring devices are generally
needed
(e) as operators are not watched for long
periods, chances of obtaining misleading results
are less.
Ans: a
74. In which of the following layouts, the lines need
to the balanced
(a) process layout
(b) product layout
(c) fixed position layout
(d) plant layout
(e) functional layout.
Ans: b
75. Which of the following layouts is suited for
mass production
(a) process layout
(b) product layout
(c) fixed position layout
(d) plant layout
(e) functional layout.
Ans: b
76. Which of the following layouts is suited to job
production
(a) process layout
(b) product layout
(c) fixed position layout
(d) plant layout
(e) functional layout.
Ans: a
77. The employees provident fund act is applicable
to
(a) all industries
(b) all industries other than small and medium
industries
(c) volunteers
(d) the industries notified by Government
(e) all major industries.
Ans: d
78. The amount deducted from the salary of
workers towards employees provident fund is
(a) credited into reserves of company
(b) deposited in nationalised bank
(c) deposited in post office
(d) deposited in the account of worker with
employer or Reserve Bank of India
(e) deposited in the account of worker with
Provident Fund Commissioner.
Ans: e
79. The deductions for, employees provident fund
start
(a) immediately on joining the service
(b) after 60 days of joining the service
(c) after 100 days of joining the service
(d) after 240 days of joining the service
(e) after one year of joining the service.
Ans: d
80. Father of time study was
(a) F.W. Taylor
(b) H.L. Gantt
(c) F.B. Gilberfh
(d) R.M. Barnes
(e) H.B. Maynord.
Ans: a
81. Tick the odd man out
(a) Taylor
(b) Drucker
(c) McGregor
(d) Galileo
(e) Parkinson.
Ans: d
82. Current assets include
(a) manufacturing plant
(b) manufacturing plant and equipment
(c) inventories
(d) common stock held by the firm
(e) all of the above.
Ans: a
83. The objective of time study is to determine the
time required to complete a job by
(a) fast worker
(b) average worker
(c) slow worker
(d) new entrant
(e) any one of the above.
Ans: b
84. Job enrichment technique is applied to
(a) reduce labour monotony
(b) overcome boring and demotivating work
(c) make people happy
(d) all of the above
(e) none of the above.
Ans: d
85. For ship vessel industry the following layout is
best suited
(a) process layout
(b) product layout
(c) fixed position layout
(d) plant layout
(e) functional layout.
Ans: c
86. In Halsey 50-50 plan, output standards are
established
(a) by time study
(b) from previous production records
(c) from one's judgement
(d) all of the above
(e) none of the above.
Ans: b
87. Routing is essential in the following type of
industry
(a) assembly industry
(b) process industry
(c) job order industry
(d) mass production industry
(e) steel industry.
Ans: a
88. An optimum project schedule implies
(a) optimum utilization of men, machines and
materials
(b) lowest possible cost and shortest possible time
for project
(c) timely execution of project
(d) to produce best results under given constraints
(e) realistic execution time, minimum cost and
maximum profits.
Ans: b
89. Graphical method, simplex method, and
transportation method are concerned with
(a) break-even analysis
(b) value analysis
(c) linear programming
(d) queing theory
(e) tnaterial handling.
Ans: c
90. Which one of the following represents a group
incentive plan ?
(a) Scanlon Plan
(b) Rowan Plan
(c) Bedaux Plan
(d) Taylor Differential Piece Rate System
(e) Halsey Premium Plan.
Ans: a
91. In the Halsey 50-50 plan, the following are
rewarded more
(a) past good workers
(b) past poor workers
(c) past average workers
(d) all of the above
(e) none of the above.
Ans: b
92. In the Halsey system of wage incentive plan, a
worker is
(a) paid as per efficiency
(b) ensured of minimum wages
(c) not paid any bonus till his efficiency
(d) never a loser
(e) induced to do more work.
Ans: b
93. 'Value' for value engineering and analysis
purposes is defined as
(a) purchase value
(b) saleable value
(c) depreciated value
(d) present worth
(e) function/cost.
Ans: e
94. Break-even analysis can be used for
(a) short run analysis
(b) long run analysis
(c) average of above two run analysis
(d) there is no such criterion
(e) none of the above.
Ans: a
95. CPM has following time estimate
(a) one time estimate
(b) two time estimate
(c) three time estimate
(d) four time estimate
(e) nil time estimate.
Ans: a
96. PERT has following time estimate
(a) one time estimate
(b) two time estimate
(c) three time estimate
(d) four time estimate
(e) nil time estimate.
Ans: c
97. In Lincoln plan (one type of group incentive
plan), the amount of the profit which an .employee
receives in addition to the guaranteed basic pay/
wages, is based on :
(a) a standard rating system
(b) a merit rating system
(c) a job evaluation system
(d) his individual performance
(e) all of the above.
Ans: b
98. Which of the following incentive plansrensures
a part of the swing to the worker and rest to the
employer
(a) Emerson efficiency plan
(b) Taylor plan
(c) Halsey premium plan
(e) Gilberth plan.
Ans: c
99. Which of the following is not wage incentive
plan
(a) differential piece rate system
(b) Rowan plan
(c) Emerson plan
(d) Taylor plan
(e) Halsey plan.
Ans: d
100. Which of the following plans motivates
supervisors by paying a premium on time saved by
workers
(a) Halsey plan
(b) Rowan plan
(c) Haynes plan
(d) Emerson's plan
(e) Taylor's plan.
Ans: c
101. The time required to complete a task is
established and a bonus is paid to the worker for
every hour he saves from the established time
required. This type of incentive plan is known as
(a) Rowan Plan
(b) Bedaux Plan
(c) Taylor Differential Piece rate system
(d) Halsey Premium plan
(e) Day work plan.
Ans: d
102. One of the basic essentials of an incentive
plan is that
(a) a differential piece rate system should exist
(b) minimum wages should be guaranteed
(c) provide incentive to group efficiency
performance
(d) all standards should be based on optimum
standards of production
(e) all standards should be based on time studies.
Ans: e
103. In the Emerson efficiency plan, a worker
receives only his daily wage and no bonus is paid
till his efficiency reaches
(a) 50%
(b) 661%
(c) 75%
(d) 80%
(e) 90%.
Ans: b
104. According to Rowan plan, if H = hourly rate, A
= actual time and S = standard time, then wages
will be
(a) HA
(b) HA + (S~A) HA
(c) HA + ^^-H
(d) HA + ^^-H
(e) HA + ^^-HA.
Ans: b
105. If a worker gets a daily wage of Rs HA, then
according to Rowan plan, his maximum daily
earnings can be
(a) 2 HA
(b) 1.33 HA
(c) 1.5 HA
(d) 1.15 HA
(e) 2.5 HA.
Ans: a
106. In A-B-C control policy, maximum attention is
given to
(a) those items which consume money
(b) those items which are not readily available
(c) those x items which are in more demand
(d) those items which consume more money
(e) proper quality assurance program-mes.
Ans: d
107. Which one of the following represents a group
incentive plan ?
(a) Halsey Premium Plan
(b) Bedaux Plan
(c) Lincoln Plan
(d) Rowan Plan
(e) Taylor Plan.
Ans: c
108. The mathematical technique for finding the
best use of limited resources in an optimum
manner is known as
(a) operation research
(b) linear programming
(c) network analysis
(d) queuing theory
(e) break-even analysis.
Ans: b
109. In order that linear programming techniques
provide valid results
(a) relations between factors must be linear
(positive)
(b) relations between factors must be linear
(negative)
(c) (a) or (b)
(d) only one factor should change at a time, others
remaining constant
(e) none of the above.
Ans: c
110. The linear programming techniques can be
applied successfully to industries like
(a) iron and steel
(b) food processing
(c) oil and chemical
(d) banking
(e) all of the above.
Ans: e
111. The simplex method is the basic method for
(a) value analysis
(b) operation research
(c) linear programming
(d) model analysis
(e) none of the above.
Ans: c
112. The two-bin system is concerned with
(a) ordering procedure
(b) forecasting sales
(c) production planning
(d) despatching and expediting
(e) none of the above.
Ans: a
113. The time required to complete a job is
established and a bonus is paid to the worker
based on the exact % of time
saved. This type of incentive plan is known as
(a) Dry work Plan
(b) Halsey Premium Plan
(c) Taylor Plan
(d) Bedaux Plan
(e) Rowan Plan.
Ans: e
114. Replacement studies are made on the fol-
lowing basis:
(a) annual cost method
(b) rate of return method
(c) total life average method
(d) present worth method
(e) any one of the above.
Ans: e
115. String diagram is used
(a) for checking the relative values of various
layouts
(b) when a group of workers are working at a place
(c) where processes require the operator to be
moved from one place to another
(d) all of the above
(e) none of the above.
Ans: d
116. Which of the following depreciation system
ensures that the interest be charged on the cost of
machine asset every year on the book value, but
the rate of depreciation every year remains
constant
(a) sinking fund method
(b) straight line method
(c) A-B-C charging method
(d) annuity charging method
(e) diminishing balance method.
Ans: d
117. Bin card is used in
(a) administrative wing
(b) workshop
(c) foundry shop
(d) stores
(e) assembly shop.
Ans: d
118. Slack represents the difference between the
(a) latest allowable time and the normal expected
time
(b) latest allowable time and the earliest expected
time
(c) proposed allowable time and the earliest
expected time
(d) normal allowable time and the latest expected
time
(e) project initiation tune and actual starting time.
Ans: b
119. PERT and CPM are
(a) techniques to determine project status
(b) decision making techniques
(c) charts which increase aesthetic appearance of
rooms
(d) aids to determine cost implications of project
(e) aids to the decision maker.
Ans: e
120. A big advantage of PERT over Gantt charts is
that in the former case
(a) activities and events are clearly shown
(b) early start and late finish of an activity are
clearly marked
(c) activity times are clear
(d) critical path can be easily determined
(e) inter-relationship among activities is clearly
shown.
Ans: e
121. CPM is the
(a) time oriented technique
(b) event oriented technique
(c) activity oriented technique
(d) target oriented technique
(e) work oriented technique.
Ans: c
122. PMTP (predetermined motion time systems)
include
(a) MTM (method time measurement)
(b) WFS (work factor systems)
(c) BNTS (basic motion time study)
(d) all of the above
(e) none of the above
Ans: d
123. Work study comprises following main
techniques
(a) method study and work measurement
(b) method study and time study
(c) time study and work measurement
(d) method study and job evaluation
(e) value analysis and work measurement.
Ans: a
124. Which of the following equations is not in
conformity with others
(a) organisation performance x motivation = profits
(b) knowledge x skill = ability
(c) ability x motivation = performance
(d) attitude x situation = motivation
(e) performance x resources
Ans: a
125. PERT is the
(a) time oriented technique
(b) event oriented technique
(c) activity oriented technique
(d) target oriented technique
(e) work oriented technique.
Ans: b
126. The basic difference between PERT and CPM
is that
(a) PERT deals with events and CPM with activities
(b) critical path is determined in PERT only
(c) costs are considered on CPM only and not in
PERT
(d) guessed times are used in PERT and evaluated
times in CPM
(e) PERT is used in workshops and CPM in plants.
Ans: d
127. PERT stands for k (fit) project evaluation and
review technique
(b) project examination and review technique
(c) project evaluation and reporting technique
(d) process execution and reporting technology
(e) project execution and results technique.
Ans: a
128. Queuing theory is used for
(a) inventory problems
(b) traffic congestion studies
(c) job-shop scheduling
(d) all of the above
(e) none of the above.
Ans: d
129. In queuing theory, the nature of the waiting
situation can be studied and analysed
mathematically if
(a) complete details'of items in, waiting line are
known
(b) arrival and waiting times are known and can be
grouped to form a waiting line model
(c) all variables and constants are known and form
a linear equation
(d) the laws governing arrivals, service times, and
the order in which the arriving units are taken into
source are known
(e) all of the above.
Ans: d
130. Queuing theory is associated with
(a) sales
(b) inspection time
(c) waiting time
(d) production time
(e) inventory.
Ans: c
131. The reasons which are basically responsible
for the formation of a queue should be that
(a) the average service rate Hess than the average
arrival rate
(b) output rate is linearly proportional to input
(c) output rate is constant and the input varies in a
random manner
(d) all of the above
(e) none of the above.
Ans: d
132. Monte Carlo solutions in queuing theory are
extremely useful in queuing problems
(a) that can't be analysed mathematically
(b) involving multistage queuing
(c) to verify mathematical results
(d) all of the above
(e) none of the above.
Ans: a
133. In perpetual inventory control, the material is
checked as it reaches its
(a) minimum value
(b) maximum value
(c) average value
(d) middle value
(e) alarming value.
Ans: a
134. A milestone chart
(a) shows the inter dependences of various jobs
(b) depicts the delay of jobs, if any
(c) points outgoing ahead of schedule of jobs, if any
(d) all of the above
(e) none of the above.
Ans: e
135. Bar charts are suitable for
(a) minor works
(b) major works
(c) large projects
(d) all of the above
(e) none of the above.
Ans: a
136. The first method invented for planning
projects was
(a) bar chart method
(b) milestone chart
(c) critical path method (CPM)
(d) programme evaluation and review technique
(PERT)
(e) none of the above.
Ans: a
137. Pick up the correct statement from the
following
(a) programmer evaluation and review technique is
event oriented
(b) programmer evaluation and review technique is
not event oriented
(c) critical path method is event oriented
(d) critical.path method is not activity oriented
(e) none of the above.
Ans: e
138. Pick up the correct statement from the
following
(a) critical path method is an improvement upon
bar chart method
(b) critical path method provides a realistic
approach to the daily problems
(c) critical path method avoids delays which are
very common in bar chart
(d) critical path method was invented by Morgan R.
Walker of Dupot and James E. Kelley of Remington
U.S.A in 1957
(e) all of the above.
Ans: e
139. Pick up the correct step used for scheduling a
project by C.P.M.
(a) a project is divided into various activities
(b) required time for each activity is established
(c) sequence of various activities is made
according to their importance
(d) network is drawn by connecting the activities
and the events
(e) all of the above.
Ans: e
140. The time of completing a project in network
analysis is given by following time of the critical
activity meeting at the finalitiode
(a) early finish
(b) early start
(c) late start
(d) late finish
(e) none of the above.
Ans: a
141. The disadvantage of product layout is
(a) high initial investment for the specialized
facilities
(b) skilled labour to operate machines
(c) production time is longer, requiring more goods
in inventory
(d) high cost of inspection
(e) costly and complex production control.
Ans: a
142. Emergency rush order can be pushed more
effectively in
(a) job production
(b) automatic production
(c) continuous production
(d) intermittent production
(e) none of the above.
Ans: d
143. Routing assists engineers in deciding in
advance
(a) the flow of material in the plant
(b) the methods of proper utilization of manpower
(c) the methods of proper utilization of machines
(d) the layout of factory facilities
(e) normal route of workers through the plant.
Ans: c
144. The performance of a specific task in CPM is
known as
(a) dummy
(b) event
(c) activity
(d) contract
(e) none of the above.
Ans: c
145. Pick up the incorrect statement from the
following
(a) an activity of the project is denoted by an arrow
on the net work
(b) the tail of the arrow indicates the start of the
activity
(c) the head of the arrow indicates the end of,the
activity!
(d) the arrows are drawn (to scale from) left to
right
(e) each activity consumes a given time
Ans: d
146. The artificial activity; which indicates that an
activity following it cannot be started unless, the
preceding activity is complete, is known as
(a) event
(b) free float
(c) artificial
(d) constraint
(e) dummy.
Ans: e
147. A dummy activity
(a) is artificially introduced
(b) is represented by a dotted line
(c) does not require any time
(d) all of the above
(e) none of the above.
Ans: d
148. If E is the duration, ES and EF are die earliest
start and finish times, LS and LF are latest start
and finish times, then the following relation holds
good
(a) EF=ES+D
(b) LS=LF-D
(c) LF = LS + D
(d) D = EF-ES
(e) all of the above.
Ans: e
149. The difference between the time available to
do the job and the time required to do the job, is
known as
(a) event
(b) float
(c) duration
(d) constraint
(e) none of the above.
Ans: b
150. The probability distribution of activity times in
PERT follows following distribution
(a) normal
(b) binomial
(c) beta
(d) exponential
(e) Gaussian.
Ans: c
151. The probability distribution of project
completion in PERT follows following distribution
(a) normal
(b) binomial
(c) beta
(d) exponential
(e) Gaussian.
Ans: e
152. If TL is the largest allowable event
occurrence time, total activity slack (s) is equal to
(a) latest start time - earliest start time
(b) latest finish time - earliest finish time (EFT)
(c) TL-EFT
(d) all of the above
(e) none of the above.
Ans: d
153. The critical activity has
(a) maximum float
(p) minimum float
(c) zero float,
(d) average float
(e) none of these.
Ans: c
154. The time by which the activity completion time
can be delayed without affecting the start of
succeeding activities, is Known as
(a) duration
(b) total float
(c) free float
(d) interfering float
(e) none of the above.
Ans: c
155. The critical path of a network represents
(a) the minimum time required for completion of
project
(b) the maximum time required for completion of
project
(c) maximum cost required for completion of
project
(d) minimum cost required for completion of
project
(e) none of the above.
Ans: a
156. Pick up the correct statement from the
following
(a) the float may be positive, zero or negative
(b) if the float is positive and the activity is delayed
by a period equal to its total float, the completion of
project in not delayed
(c) if the float of an activity is negative, delay in its
performance is bound to delay the completion of
project
(d) if the float of an activity is zero, the activity is
critical and any delay in its performance will delay
the whole project
(e) all of the above.
Ans: e
157. Critical path moves along the activities having
total float of
(a) positive value
(b) negative value
(c) zero value
(d) same value
(e) none of the above.
Ans: c
158. Critical Path Net Work helps an engineer
(a) to concentrate his attention on critical activities
(b) to divert the resources from non-critical
advanced activities to critical activities
(c) to be cautious for avoiding any delay in the
critical activities to avoid delay of the whole project
(d) all of the above
(e) none of the above.
Ans: d
159. Pick up the correct statement about
relationship between various floats
(a) free float = total float
(b) independent float = total float
(c) independent float > free float
(d) free float > total float
(e) independent float < free float.
Ans: e
160. The time which results in the least possible
direct cost of an activity is known as
(a) normal time
(b) slow time
(c) crash time
(d) standard time
(e) none of the above.
Ans: b
161. The technique for establishing and maintaining
priorities among the various jobs of any project is
known as
(a) event flow scheduling technique
(b) critical ratio scheduling
(c) slotting technique for scheduling
(d) short interval scheduling
(e) none of the above.
Ans: b
162. Pick up the incorrect statement from the
following. A critical ratio scheduling
(a) establishes the relative priorities among
various activities on a common basis
(b) determines the status of each activity
(c) adjusts automatically changes in activity
progress
(d) is a dynamic system
(e) none of the above.
Ans: e
163. PERT is
(a) an analytic tool in concept
(b) limit up of event oriented diagrams
(c) used for research and development projects
(d) based on three time estimates for activities
linking up two events
(e) all of the above.
Ans: e
164. CPMis
(a) synthesising in concepts
(b) is built of activities oriented program-mes
(c) is, based on one time eytimate
(d) is used for repetitive works
(e) all of the above.
Ans: e
165. A CPM family includes
(a) CPA (Critical Path Analysis)
(b) CPP (Critical Path Plotted)
(c) MCE (Minimum Cost Expenditure)
(d) CPS (Critical Path Scheduling)
(e) all of the above.
Ans: e
166. PERT/CPM, techniques can be used for
following applications
(a) once through project
(b) maintenance jobs
(c) research and development
(d) all non-technical jobs
(e) all of the above.
Ans: e
167. PERT analysis is based on
(a) optimistic time
(b) pessimistic time
(c) most likely time
(d) all of the above
(e) none of the above.
Ans: d
168. Descripancies of bar chart techniques are
(a) consequential effects of lack in one activity on
omer
(b) consequential effects of lack in one activity on
the finish date
(c) free time available for an activity can't be
predicted
(d) effective monitoring/controlling can't be done
(e) all of the above.
Ans: e
169. O on a PERT/CPM chart represents
(a) an ordinary event
(b) a significant event representing some mile-
stone
(c) an event to be transferred to other network
chart
(d) dangling event
(e) dummy event.
Ans: a
170. Pick up the correct statement. Dummy
activity on a PERT/CPM chart means, it
(a) consumes time, but no resources
(b) consumes resources but no time
(c) consumes neither time nor resources
(d) is a dangling event
(e) consumes both resources and time.
Ans: c
171. Criticalpath on PERT/CPM chart is obtained
by joining the events having
(a) maximum slack
(b) minimum slack
(c) average slack
(d) no slack
(e) judgement and experience.
Ans: b
172. Slack of various events on the critical path in
PERT/CPM chart
(a) increases continuously
(b) decreases continuously
(c) remains constant
(d) may increase or decrease depending on
various factors
(e) unpredictable.
Ans: c
173. The assumption in PERT is
(a) a project will always be behind schedule, if left
uncorrected
(b) cost of project will always be more than the
estimated cost, if no timely corrections are taken
(c) a project can be subdivided into a set of
predictable, independent activities
(d) activities are fixed and can't be changed ,
(e) commissioning time can be changed, if
activities are behind schedule.
Ans: c
174. Activity s,lack or float of any event on a
PERT/CPM chart is represented by
(a) latest start time of succeeding event -earliest
finish time of preceding event activity time
(b) latest start time of the event - earliest start
time of the event
(c) latest finish time of event - earliest finish time
of the event
(d) anyone of the above
(e) none of the above.
Ans: d
175. The important file in making a PERT is
(a) an event can't be accomplished until activities
leading to it are completed
(b) no activity from any event can be started from
preceding event till it is completed
(c) length of arrow has nothing to do with time
(d) every activity must be completed before end
point is reached
(e) all of the above.
Ans: e
176. An event is indicated on the network by
(a) a straight line
(b) a number enclosed in a circle or a square
(c) a straight line with circles at the ends
(d) a dotted line
(e) an arrow.
Ans: b
177. In a PERT chart
(a) all activities should be numbered
(b) only important activities should be numbered
(c) only critical activities are numbered
(d) only selected activities are numbered
(e) no activity is numbered.
Ans: a
178. Positive slack on a PERT indicates that
project is
(a) ahead of schedule
(b) beyond schedule
(c) as per schedule
(d) on critical path
(e) none of the above.
Ans: a
179. Pessimistic time is
(a) the maximum time which an activity might
require
(b) the average time required for a job
(c) the most probable time considering all
conditions
(d) the minimum time in which an activity can
possibly be accomplished
(e) the earliest finish.
Ans: a
180. In PERT analysis, critical path is obtained by
joining events having
(a) +ve slack
(b) -ve slack
(c) zero sldck
(d) dummy activities
(e) critical activities.
Ans: c

How should GATE be cracked within 3 months ?

The answer for that question solely depends on You.

Here are some points that would help you :

1. Analyze Yourself

I am just a random guy on the internet,you can't. solely depend on my answer. First try to analyze yourself. Go through the syllabus and make a note that how much good you're with your syllabus. You can find the amount of syllabus you've covered by this prepmeter.
Analyze your preparation level

2. How Good are you?

Now you have gone through your syllabus and can know your weak topics.Try to focus more on them.Try to allocate as much as time as possible for those topics.And be intelligent enough to leave the topics that aren't necessary.

3.Follow Standard Textbooks

I can't stress that enough.Majority of my friends who are preparing for GATE exams bought some Mock test papers and were trying to solve them.They are more interested in knowing the technique than learning the topic.They all stuck with all the topics and were solely relying on the
"key".Don't be such kind of a person.Learn from standard textbooks they help you in clearing your basics.

Education is like a house,the basement has to be strong for the house to cherish.

4.Connect Everything

I once read a quote,it says like

" Education is learning random things.Knowledge is about
connecting all those things".

All your subjects are related to one another. So if you read a subject well then it will help you in understanding the other subject. Study SOM before MD. (Sorry! I'm a ME guy).

5.Practice.

Practice and Practice even more Lock up yourself in a room.Study a subject and solve all the questions regarding that subject in previous papers.There will be some topics in which the IIT's concentrate more.Find them and practice them even harder.If you're in college,Read the topics at home and go sit in the last bench of your class and try solving those questions. Never stop practicing.

6.Success comes at a pay

As the GATE exam is about to approach just try to give more time for your preparation.There will be lot
of time you would have been wasting in your day. Just try to minimize that.
DON'T USE INTERNET UNLESS IT IS ACADEMIC ORIENTED.(You can have
a little relaxing time on it but make sure it doesn't count as a distraction).

Give all of your effort.

What is wrong with the Indian education system in terms of growth?

Read all the answers before agreeing to the following consolidation.

The main types of answers appear to be:

1) Half the country does not even have access to proper education, and only a small fraction can go to university.

- Lack of quality primary education for the poor

- Limited seats in Universities

2) Everything is about rote memorization, leading to behaviour which encourages cramming and
forgetting rather than life long learning.

3) Standardized testing determines everything, and aptitude of students is not recognized outside this format

4) Lack of diversity in the subjects you can take in college (e.g. can't double major in Math and German. like you can in the USA)

5) Extreme pressure from parents / society to use education for financial security = CSE degrees for programming jobs or medicine. Societal pressure to get into the "right schools", not only for the
education aspect but to ensure good job/ marriage prospects, in general success in life. Little incentive to take risks and follow own interests or encourage creativity. Generally conformist culture, which makes educational achievement the only thing that matters to social standing.

6) Additional extreme pressure due to limited seats resulting in very intense competition between students.

7) Reservation system

8) Management quota system What is management quota?

9) Government control of education/ Government Monopoly in education.

10) Right to Education Act.

11) Education sector is closed to for-profit organizations.

12) Few opportunities and flexibility to cross over into different streams of education.

What is wrong with Indian Education?

So..what is the definition of wrong when it comes to education ? 

Lack of well rounded education . Nerds are restricted to books while jocks are restricted to practice nets. Unfortunately, nerds can benefit a lot from sports and learn team dynamics and how to work along with other people. Jocks on the other hand can learn a few things like critical thinking and logical reasoning.

Absence of disruptive innovators and rebels in our society . Like the commonly quoted Steve Jobs, we do have a lack of innovators (small when compared to our huge population) in our  country.
What we instead have in our country is nation of sloggers who are restricted by our underdeveloped society's definition of success and cramming in spite of unhappiness to get into an engineering college and later to get the next promotion. This is completely done irrespective of if they actually care about the subject and work but rather by social conditioning which deludes them into thinking this how they can attain salvation.

Is it unfair to compare India with say...United States ?
Well take a completely unrelated metric ..life expectancy and compare the US, India and  Singapore. Singapore was chosen by me because in the lifetime of our previous generation it managed to go from an under developed third world to a first world country. Now if you look at something as basic as life expectancy, India completely lacks behind US and Singapore with a life expectancy of something around 65. That would literally mean,  if you are in your 30s, more than half of your life
is gone (yes you can argue it is for the entire nation and not specifically the urban population.)  Anyway coming back to life expectancy, India is where Singapore was in the 1960s. 

Now what does that say to us ?
India is still in the "survival mode" . Since its creation in 1947, we have been and still are in the "survival mode". What happens in the survival mode is that we do cost-benefit  analysis of every decision in our lives and unfortunately in education, career as well as marriage. This explains why engineering is the overwhelming choice of the majority of the people in this country and in similar countries like China (who smartly have also recognized the potential of studying finance.) After we leave the "survival mode" as a nation, then only we will reach the developed stage like US and Canada where a significant fraction will choose subjects which they actually like and rather not forced by society to choose. After that when we reach the "Uber-Developed" status like Scandinavian countries, then the majority of our country, free of financial constraints will pursue their dreams.

Inspite of all this if we look at the enrollment in tertiary education in both US and India (assuming the correctness of the data, they are amazingly similar with approximately 20% enrollment with India doing better). As per the Annual Status of Education Report (ASER) 2012, 96.5% of all rural children between the ages of 6-14 were enrolled in school. This is the fourth annual survey to report enrollment above 96%. 83% of all rural 15-16 year olds were enrolled in school. However, going forward, India will need to focus more on quality.Gross enrollment at the tertiary level has crossed 20% (as per an Ernst & Young Report cited in Jan 2013 in Education News/ minglebox.com  "In 2006, 19.5 percent of the adult population had attended college but had no degree, 7.4 percent held an associate's degree , 17.1 percent held a bachelor's degree , and 9.9 percent held a graduate or professional degree . The historic gender gap had practically vanished.  New England had the highest proportion of college graduates, and the South Central states the lowest. "
So what is wrong with our curriculum ?
Actually nothing. Our curriculum is perfect and better than most countries. We are taught a vast majority of subjects (we will get to teaching methods later) which will allow us to recognize where  our interest lies later in life. Hardly do you get Shakespeare and C++ being taught at high school  level in developing country. Even in a developed country like Singapore, the syllabus is not so vast and people who might take History will not end up taking Geography. Unfortunately, our co-curricular activities lack behind a lot which would actually produce a well rounded individual. We end up being egoistical, individualistic narrow minded individual. However, till this crazy competition goes away, I doubt if any importance will be paid to co- curricular activities.
So who are we to blame ?
Parents, Teachers and Society "Cost Benefit Analysis of every Career Decision" When was the last time anyone studied engineering especially ECE because they liked it? They had been tinkering with circuits since young, taking apart radios and other stuff. When was the last time we studied anything because we liked doing it not because we can quote a huge starting annual salary?

Another consequence of the country being in the "survival mode", is that the insecurities of the parents are passed to the children over time and the ultimate objective is to achieve financial stability in whichever way possible.
"Myopic Definition of Success"
Standard definition of success common in our society is getting into a top engineering college followed by working in an unrelated field which would pay the most followed by getting into a B School to work in a field which you did not know  even existed when you were in high school. Although I congratulate the successful ones from the top schools, what concerns me is that the definition of success is extremely myopic. Life is  a long, long journey and although this might give you a good start, it will never determine where you end up.

In this way I will argue that we should stop blaming reservation as a curse of our society. Reservations can only stop you to a certain point and blaming them for "ruining your whole life" is extremely short sighted.
"Nation of Conformists"
We although will hate to admit, are a nation of conformists. Adventure and risk taking as a whole is just lacking in our DNA. We never explored China during ancient times (Marco Polo came from  Italy), we never bothered to go to Africa till there were jobs for us. We are shit scared to be different.  Every career decision is approved by our parents and society. We are just afraid of making a mistake and being pointed at. This comes from the very fact that  since childhood, our teachers will label anyone different to be a "problem child" who needs psychiatric help, thanks to their limitations as incomplete human beings. We are so scared that we even make our parents choose our life  partners.

Sometimes this delusion and comfort in success are gone by our early 30s and for the first time we want to live for ourselves. Unfortunately thanks to our small life expectancy and probably a family and child to support, this becomes a dream which we can never fulfill. Have you noticed why your father is grumpy all the time...this might be the very reason..!!
So is there any hope left ?

Yes! there is. This new generation is slowly breaking conventions and we are seeing more artists, more designers, more scientists.
Things will be much better by the next generation when people will choose careers out of their own free will.

Tuesday 28 October 2014

The Pros And Cons OfTurbochargers Vs Superchargers

Have you ever wondered what the advantages of a turbocharger are over a supercharger? Or vice versa? Well, wonder no more, because here is the best explanation you're likely to ever read...

When designing an engine to pull in more than atmospheric pressure, tuners often turn to forced induction. It’s one of the fastest ways to add significant power to almost any engine, and there are two prevalent ways it can be done:
supercharging and turbocharging.
What’s the difference?
A supercharger is an air compressor driven by the crankshaft of an engine, usually connected with a belt. Alternatively, a turbocharger is simply an air compressor driven by an exhaust gas turbine. That’s the one key difference; a supercharger requires engine power to run, while a turbocharger runs off waste energy created by the engine. You might assume that because the turbo is run off waste gases that it’s more efficient, and you’d be correct!

1. Turbocharger advantages and disadvantages:
Pros:
Significant increase in horsepower.
Power vs size: allows for smaller engine displacements to produce much more power. relative to their size.
Better fuel economy: smaller engines use less fuel to idle, and have less rotational and reciprocating mass, which improves fuel economy.
Higher efficiency: turbochargers run off energy that is typically lost in naturally-aspirated and supercharged engines (exhaust gases), thus the recovery of this energy improves the overall efficiency of the engine.
Cons:
Turbo lag: turbochargers, especially large turbochargers, take time to spool up and provide useful boost.
Boost threshold: for traditional turbochargers, they are often sized for a certain RPM range where the exhaust gas flow is adequate to provide additional boost for the engine. They typically do not operate across as wide an RPM range as superchargers.
Power surge: in some turbocharger applications, especially with larger turbos, reaching the boost threshold can provide an almost instantaneous surge in power, which could compromise tyre traction or cause some instability of the car.
Oil requirement: turbochargers get very hot and often tap into the engine’s oil supply. This calls for additional plumbing, and is more demanding on the engine oil. Superchargers typically don't require engine oil lubrication.
2. Supercharger advantages and disadvantages:
Pros:
Increased horsepower: adding a supercharger to any engine is a quick solution to boosting power.
No lag: the supercharger’s biggest advantage over a turbocharger is that it does not have any lag. Power delivery is immediate because the
supercharger is driven by the engine’s crankshaft.
Low RPM boost: good power at low RPM in comparison with turbochargers.
Price: cost effective way of increasing
horsepower.
Cons:
Less efficient: the biggest disadvantage of superchargers is that they suck engine power simply to produce engine power. They’re run off an engine belt connected to the crankshaft, so you’re essentially powering an air pump with another air pump. Because of this, superchargers are significantly less efficient than turbochargers.
Reliability: with all forced induction systems (including turbochargers), the engine internals will be exposed to higher pressures and temperatures, which will of course affect the longevity of the engine.

It’s best to build the engine from the bottom up to handle these pressures, rather than relying on stock internals. Superchargers often go hand in hand with big V8s, and they’re certainly capable of producing big power.
Which do I prefer?
As an engineer, it’s difficult to not side with efficiency. Turbochargers simply make more sense, as they improve the efficiency of the engine in multiple ways. Superchargers are an extra demand on the engine, even if they are capable of producing useful boost at low RPM. But if you find yourself unable to decide, it is possible to use both simultaneously, and it’s called twin-charging.

Monday 27 October 2014

Professor Bhaskar Ramamurthi, Director of IIT Madras, answersquestions on Vision 2020 for the institution. Excerpts from an interview…

Where does IIT Madras stand globally?....................Professor Bhaskar Ramamurthi, Director of IIT Madras

With the second strategic plan for IIT Madras having been put forth,  The IITs have already grown into a brand. Why then hanker for an international rank?
The IITs are not meant only for undergraduate education. What you are talking about is our global position as a top undergraduate educational institution. …you can’t do world-class undergraduate teaching without doing research also. Now the government has made it clear that they want research as a direct output, not just as a part of undergraduate teaching. So we have to aspire for a ranking on all outputs. We want to be known for our post- graduate output and research output as well. The global rankings don’t capture this too well and the government wants to set up an Indian ranking framework which takes into account what our objectives are. 

But while this may be true, we must rank ourselves to see where we stand globally. How will it change things?
It can only improve. We are also getting a lot of interest from the cream of undergraduate students, not just our own, after the launch of the direct PhD programme [PhD after BTech]. I recently met with 80 students we have picked this way; they’ve all come because they have made an early decision to get into research. As many hands were raised for industry as for teaching. This is very good for the
country and for us to pick them early and nurture them. I was really encouraged by this.

Can you talk about the MoUs with foreign universities ?
We have MoUs with nearly 150 universities. With 50 to 60 of them there are PhDs being  co-supervised with their faculty and with five there are joint PhD programmes planned.
You have talked about developing interdisciplinary centres. What are the directions in which IIT Madras is likely to make progress?
We are seeing very clearly that some 25 [interdisciplinary] centres are coming up. Propulsion technologies became obvious to me a year or so ago. For about two years now, we have been working on getting the right centre, for our capabilities, on data sciences. We want an interdisciplinary group. We’ve assembled six to seven faculties, now it’s grown to about ten. It will be based more on networks. Whether it’s a transportation network or a biological network or a network of wireless communication nodes, what you can learn about these systems and what is happening based on volumes of data that you generate, that is the area we want to look at. There is a big centre on machine tools coming up. We have proposed a large centre in advanced manufacturing, to focus on very new areas of manufacturing, not what is traditionally understood.

You plan to change the curriculum so that students will be taking 50 per cent core courses and 50 per cent electives. Please elaborate.
There are some constraints of the IIT system by which students have to choose their branch at the time of joining — whether they know anything about it or not. There’s no easy way around this. However, what we are saying is that we will define the curriculum for each of these majors in such a way that with the core courses, roughly 50 per cent, you will be legitimately qualified for a bachelor’s degree in that discipline; as you grow here, if you find that your interests are taking you [elsewhere],
through the electives you can redefine yourself. Your degree might say you’re from metallurgical engineering, but your transcript will say you are also somewhat different. And very often in the world, jobs as well as higher education is as much based on what your transcript says as your degree. The students will be able to move in the direction they want.  

Student life has changed in recent times. People are more isolated and face pressures, perhaps because of technology. Is there a plan to address this?
Our counselling setup is becoming bigger and better all the time. Now counselling is not just for those in trouble. It is for everybody. We are now seeing that everybody is involved in some activity  other than their academics — it could be sport, music, art, literature, debate… We are trying to track  that. Our counselling is becoming more proactive. We try to find out the students who are not doing anything and ask them, “Would you like to do something [else]?” We are trying to open out more things for the students. We are trying to reach out and be more available, with quick closing of feedback loops so that we can counsel if they are in trouble of any kind or confused in any way.

The campus is poised to become more student- friendly. Can you explain?
One thing I have always noticed in many universities around the world is that there is a square — where it is very nice. Somewhere off the square there is a cafeteria and a lot of people hang out there. IIT Madras in particular has had to deal from its inception that it is in a very pristine natural setting. And we just don’t have a square — a central, human-designed, architected, space. For the new academic complex that’s coming up, we have found a way to create a big social space and a food court nearby. We need a place which is a very obvious hangout for students. The new academic complex is coming up where we used to have our big godowns earlier. There used to be a bus depot
nearby, we got rid of that and it turns out that there is a big open area there which is going to become a quadrangle.

This is not the satellite campus?
No, the satellite campus may or may not happen. We are working with the Tamil Nadu government on that and they are trying very hard to find us suitable land. It obviously cannot be very far from [the main campus]. Finding a suitable land has been a challenge, but we have identified it and it is now at a very advanced stage of consideration in the government. If that comes, that will change our planning, but it will not change the need for that kind of place here.

Tuesday 21 October 2014

Engineering Explained: The Pros And Cons Of Different Engine Types

Engineering Explained: The Pros And Cons Of Different Engine Types

The most common engine types - the four-cylinder, the boxer-four, straight-six, V6 and V8 - have their
own pros and cons. Here's everything you need to know in one handy guide...

By Engineering

What makes more power, a 4.0-litre V6 engine or a 4.0-litre V8? The answer isn’t so simple. When discussing various engines, the layout isn’t the biggest contributing factor to how much power it makes. With a bit of ingenuity (and you know, cash), a four cylinder engine can make just as much power as a V12. So what makes manufacturers
choose different engine layouts?

Here are the advantages and disadvantages of each layout.

1. Four-cylinder inline four

Let’s start with one of the most common engines, the inline four cylinder. There’s a reason it’s common, largely because it’s so simple: one cylinder bank, one cylinder head and one valve train. Here’s all you need to know:

Advantages:

->The four-cylinder, inline four is small and compact, meaning it easily fits in nearly any engine bay.

-> It’s also lightweight, and with only one exhaust manifold, weight is further reduced.

-> With only one cylinder head, there are fewer moving parts than engines with multiple cylinder banks. This means less energy is lost which
reduces the probability of malfunctions.

-> Primary forces are balanced because the outside two pistons move in the opposite direction of the inside two pistons (see picture above).

-> Four-cylinder engines are easy to work on; the cylinder head is the highest point which makes spark plug jobs and valve train access very
easy.

->. Four-cylinder engines require lower manufacturing costs.

Disadvantages:

-> Secondary forces are not balanced, which ultimately limits the size of the engine.

-> Inline fours will rarely exceed 2.5 litres to 3.0 litres.

-> Larger four cylinder engines will often require balancing shafts to cancel the vibration caused by the secondary imbalance.

->High centre of gravity compared to some layouts (H4).

-> Not as rigid as some layouts (V6, V8).

2. Horizontally-opposed

From a performance standpoint, there aren’t many options as attractive as an engine with horizontally- opposed cylinders. The boxer four isn’t nearly as common as the other engines on this list, but from an engineering standpoint it’s a logical choice for your race car.

Advantages:

Primary and secondary forces are well balanced.

This is a smooth engine.

This allows for less weight on the crankshaft, resulting in less power lost to rotational inertia.

Low centre of gravity allows for better handling.

Disadvantages:

Packaging size: these are very wide engines.

Flat engines were once used in Formula 1 for their performance advantages, but due to their width they obstructed airflow and are no longer used.

Complexity - two cylinder heads/valve trains.

Rocking couple (plane imbalances) due to offset pistons to allow for the connecting rods to connect with the crankshaft.

Maintenance can be challenging if packaging is tight.

3. Straight-six

An engineer’s object of affection, the straight-six is the result of tacking on two more cylinders to an inline four engine. BMW loves them, and it’s the
layout of one of the most well-known boost-ready engines, the 2JZ. So what’s so special about the straight-six?

Advantages:

The straight-six is Inherently balanced.

The layout combined with its firing order leads to essentially the smoothest engine out there.

V12s and Flat-12s are the next step in further reducing vibration, as they are two I6s matched together.

Lower manufacturing cost - single cylinder block with all the cylinders in one orientation.

Simple design, easy to work on much like the I4.

Disadvantages:

Packaging can be difficult due to the length.

Not ideal for FWD vehicles.

High center of gravity (vs flat engines).

Lower rigidity than V engines as it’s long and narrow.

4. V6

Now cut that straight-six in half and match the two cylinder banks to a common crank. The V6 is a common layout when there are six spark plugs
involved. It’s also the current layout for Formula 1 engines. Why use it?

Advantages:

They’re compact and can easily be used for both FWD and RWD vehicles.

Allows for greater displacement than four- cylinder engines, typically meaning more power.

Rigid design. Formula 1 chose to use V6s rather than I4s for the 2014 season because they wanted to use the engine as a stressed member of the car.

Disadvantages:

Two cylinder heads means added cost, complexity, and weight.

Additional rotational inertia and friction (more moving parts).

High centre of gravity vs flat engines.
Cost is often greater than inline.

Secondary imbalance requires additional weight on the crankshaft.

Two exhaust manifolds means additional weight.

5. V8

When you add a cylinder to each bank of the V6, you get an icon in both American muscle and European exotics - the V8. It can produce a refined whine, or a shuddering burble. So what makes this layout such a popular choice?

Advantages:

Packaging size (short in length).

Good balance, depending on the crankshaft type and firing order (flatplane vs crossplane).

Rigid design.
Allows for high displacement.

Disadvantages:

Like a V6, the V8 engine’s weight can be high.

Additional rotational inertia and friction (more moving parts).

Cost and complexity will be higher.

Higher centre of gravity vs flat engines.

Engine weight is usually increased.
Packaging is large, typically restricted to RWD/ AWD vehicles.

Let us know below which engine type you are currently running and what you like and loathe about it.

Friday 17 October 2014

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Monday 13 October 2014

Supercharger:-

SUPERCHARGER


A supercharger is an air compressor that increases the pressure or density of air supplied to an internal combustion engine.  This gives each intake cycle of the engine more oxygen, letting it burn more fuel and do more work, thus increasing power.

Power for the supercharger can be provided mechanically by means of a belt, gear, shaft, or chain connected to the engine's crankshaft. When power is provided by a turbine powered by exhaust gas, a supercharger is known as a turbo supercharger typically referred to simply as a turbocharger or just
turbo.