mechanical engineering MCQs – Page 68

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 Review each marked answer and report any item that may be outdated or unclear.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

1341. PERT is___________________?
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A. limit up of event oriented diagrams

B. used for research and development projects

C. an analytic tool in concept

D. all of the above

E. based on three time estimates for activities linking up two events

1342. Critical Path Net Work helps an engineer_________________?
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A. all of the above

B. to concentrate his attention on critical activities

C. none of the above

D. to divert the resources from non-critical advanced activities to critical activities

E. to be cautious for avoiding any delay in the critical activities to avoid delay of the whole project

1343. 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______________________?
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A. LF = LS + D

B. LS=LF-D

C. all of the above

D. D = EF-ES

E. EF=ES+D

1344. A fuel will detonate less if it has___________________?
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A. proper self ignition temperature

B. lower self ignition temperature

C. self ingition temperature has nothing to do with detonation

D. none of the above

E. higher self ignition temperature

1345. Ignition timing of a multicylider petrol engine can be adjusted by_________________?
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A. adjusting ignition coil position

B. delaying the spark by increasing capacitor in ignition circuit

C. rotating the crank

D. rotating the distributor

E. adjusting the spark plug gap

1346. Mild steel belongs to the following category___________________?
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A. low carbon steel

B. medium carbon steel

C. special steel

D. alloy steel

E. high carbon steel

1347. 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_____________________?
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A. A-B-C charging method

B. diminishing balance method

C. straight line method

D. sinking fund method

E. annuity charging method

1348. The technique for establishing and maintaining priorities among the various jobs of any project is known as___________________?
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A. short interval scheduling

B. slotting technique for scheduling

C. critical ratio scheduling

D. event flow scheduling technique

E. none of the above

1349. Process layout is employed for_________________?
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A. effective utilisation of machines

B. none of the above

C. all of the above

D. continuous type of product

E. batch production

1350. The probability distribution of project completion in PERT follows following distribution_________________?
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A. beta

B. exponential

C. binomial

D. normal

E. Gaussian

1351. The most important objective behind plant layout is_____________________?
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A. overall simplification, safety of integration

B. to provide conveniently located shops

C. to avoid any bottlenecks

D. economy in space

E. maximum travel time in plant

1352. If diesel is fed by mistake in the oil tank of a petrol engien, then engine will________________?
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A. run for some time and then stop

B. give lot of smoke

C. detonate

D. knock

E. not run

1353. The thermal efficiency of a semi-diesel cycle having fixed compression ratio and fixed quantity of heat, with increase in pressure ratio will_______________?
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A. decrease

B. first increase and then decrease

C. increase

D. increase/decrease depending upon engine capacity

E. remain unaffected

1354. In turbulence chamber in diesel engine__________________?
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A. only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge

B. fuel is partly burnt by spark

C. fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat

D. there are no valves

E. the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect of fuel mixture

1355. Leakage past the piston rings and valve seats in I.C. engines with increase in speed_______________?
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A. increases.

B. unpredictable

C. decreases

D. remains same

E. none of the above

1356. The firing order in a six stroke I.C. engine is_________________?
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A. 1-5-3-4-2-6