mechanical engineering MCQs – Page 71

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 Review each marked answer and report any item that may be outdated or unclear.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

1401. The knocking in diesel engines for given fuel, will be__________________?
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A. unaflected by compression ratio

B. enhanced by decreasing compression ratio

C. enhanced by increasing compression ratio

D. dependent on other factors

E. first enhanced by increasig compression ratio upto a limit beyond which it will be suppressed

1402. Pick up the incorrect statement from the following. A critical ratio scheduling____________________?
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A. adjusts automatically changes in activity progress

B. establishes the relative priorities among various activities on a common basis

C. determines the status of each activity

D. is a dynamic system

E. none of the above

1403. Pessimistic time is___________________?
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A. the most probable time considering all conditions

B. the maximum time which an activity might require

C. the earliest finish

D. the average time required for a job

E. the minimum time in which an activity can possibly be accomplished

1404. Exhaust pipes of engines are covered with insulating marterial in order to_________________?
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A. conserve heat

B. reduce heat transfer to the engine room

C. reduce formation of condenstae

D. keep the exhaust pipes warm

E. increase engine efficiency

1405. Which of the following plans motivates supervisors by paying a premium on time saved by workers_________________?
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A. Emersons plan

B. Halsey plan

C. Haynes plan

D. Rowan plan

E. Taylors plan

1406. In precombustion 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. There are no valves

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

D. The shape and layout of the pistion crown, the inlet port, and the valve produce the turbulent effect of fuel mixture

1407. In order that linear programming techniques provide valid results________________?
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A. relations between factors must be linear (negative)

B. only one factor should change at a time, others remaining constant

C. none of the above

D. relations between factors must be linear (positive)

E. A. or B.

1408. The ability of a material to resist softening at high temperature is known as____________________?
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A. fatigue

B. creep