mechanical engineering MCQs – Page 74

Practise multiple-choice questions from mechanical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

mechanical engineering Mcqs

1. compressors gas turbines and jet engines 2. theory of machines 3. nuclear power plants 4. engineering materials 5. strength of materials mechanical engineering 6. thermodynamics 7. heat transfer 8. i c engines 9. steam boilers engines nozzles and turbines 10. engineering mechanics 11. fluid mechanics mechanical engineering 12. production technology 13. machine design 14. hydraulic machines 15. workshop technology 16. refrigeration and air conditioning

1461. Slack represents the difference between the___________________?
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A. latest allowable time and the normal expected time

B. project initiation tune and actual starting time

C. latest allowable time and the earliest expected time

D. proposed allowable time and the earliest expected time

E. normal allowable time and the latest expected time

1462. Criticalpath on PERT/CPM chart is obtained by joining the events having____________________?
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A. no slack

B. maximum slack

C. average slack

D. minimum slack

E. judgement and experience

1463. The ignition of charge by some hot surface in the engine cylinder before operation of spark plug is known as________________?
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A. preignition

B. retarded ignition

C. accelerated ignition

D. auto ignition

E. detonation

1464. The two-bin system is concerned with_________________?
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A. forecasting sales

B. none of the above

C. production planning

D. despatching and expediting

E. ordering procedure

1465. The objective of time study is to determine the time required to complete a job by_______________?
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A. slow worker

B. any one of the above

C. new entrant

D. fast worker

E. average worker

1466. Work study is concerned with_________________?
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A. improving production capability

B. motivation of workers

C. improving present method and finding standard time

D. all of the above

E. improving production planning and control

1467. Injection lag is_________________?
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A. none of the above

B. the time taken by fuel after injection (before top dead center) to reach upto auto-ignition temperature

C. time before actual fuel injection and the pump pluger starts to pump fuel

D. time corresponding to actual injection and top dead center

E. time corresponding to actual ignition and top dead center

1468. Pick up the incorrect statement about advantages of work sampling_________________?
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A. permits a fine breakdown of activities and delays

B. simultaneous study of many operators may be made by a single observer

C. no time measuring devices are generally needed

D. as operators are not watched for long periods, chances of obtaining misleading results are less

E. calculations are easier, method is economical and less time consuming

1469. If TL is the largest allowable event occurrence time, total activity slack (s) is equal to__________________?
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A. none of the above

B. all of the above

C. TL-EFT

D. latest finish time earliest finish time (EFT)

E. latest start time earliest start time

1470. Ignition quailty of petrol is expressed by___________________?
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A. self ignition temperature

B. cetane number

C. calorific value

D. distillation temperature

E. octane number

1471. The assumption in PERT is__________________?
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A. commissioning time can be changed, if activities are behind schedule

B. activities are fixed and cant be changed ,

C. cost of project will always be more than the estimated cost, if no timely corrections are taken

D. a project can be subdivided into a set of predictable, independent activities

E. a project will always be behind schedule, if left uncorrected

1472. Piston rings are plated with chromium,cadmium or phosphate in order to__________________?
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A. reduce wear and eliminate scuffing

B. improve heat transfer

C. reduce cost

D. prevent clogging

E. improve surface finish

1473. Power impulses from an I.C. engine are somoothed out by__________________?
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A. timing spark properly

B. flywheel

C. governor

D. gear box

E. crank shaft

1474. Piston rings are usually made of___________________?
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A. babbitt

B. cast iron

C. aluminium

D. phosphor bronze

E. carbon steel

1475. Which of the following incentive plansrensures a part of the swing to the worker and rest to the employer_______________?
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A. Gilberth plan

B. Emerson efficiency plan

C. Taylor plan

D. Halsey premium plan

1476. Ignition lag is__________________?
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A. the time taken by fuel after injection (before top dead center) to reach upto auto-ignition temperature

B. time corresopnding to actual ingition and top dead center

C. none of the above

D. time before actual fuel injection and the pump plunger starts to pump fuel

E. time corresponding to actual injection and top dead center

1477. Positive slack on a PERT indicates that project is________________?
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A. ahead of schedule

B. on critical path

C. none of the above

D. beyond schedule

E. as per schedule

1478. String diagram is used_________________?
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A. all of the above

B. when a group of workers are working at a place

C. none of the above

D. where processes require the operator to be moved from one place to another

E. for checking the relative values of various layouts

1479. The artificial activity; which indicates that an activity following it cannot be started unless, the preceding activity is complete, is known as_________________?
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A. free float

B. dummy

C. constraint

D. event

E. artificial

1480. In isochronous governing, speed droop is_______________?
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A. 1%.

B. 30%

C. 5%

D. 100%

E. 50%

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