mechanical engineering MCQs – Page 61

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 Review each marked answer and report any item that may be outdated or unclear.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

1201. Which process will increase the fatigue duration of parts ?
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A. electroplating

B. shot-peening

C. decarburisation

D. all of the above.

E. finishing and polishing

1202. The output of a diesel engine can be increased without increasing the engine revolution or size in following way_________________?
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A. increasing flywheel size

B. scavenging

C. feeding more fuel

D. supercharging

E. heating incoming air

1203. Residual stress in materials_________________?
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A. is independent of external loads

B. is always beneficial

C. becomes zero when external load is removed

D. acts when external load is applied

E. is always harmful

1204. Merit Rating is the method of determining worth of_______________?
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A. overall quality

B. a job

C. a particular division in workshop

D. an individual employee

E. machine

1205. Basic hole is one_________________?
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A. whose upper deviation is zero

B. none of the above

C. whose lower deviation is zero

D. does not exist

E. whose lower as well as upper deviations are zero

1206. Expediting function consists in keeping a watch on__________________?
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A. operators activity

B. minimising the delays

C. making efficient despatching

D. flow of material and in case of trouble locate source of trouble

E. none of the above

1207. Diesel fuel, compared to petrol is_________________?
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A. just about the same difficult to ignite

B. more difficult to ignite

C. less difficult to ignite

D. none of the above

E. highly ignitable

1208. Maximum principal stress theory is applicable for_____________________?
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A. brittle materials

B. all of the above

C. none of the above

D. elastic materials

E. ductile materials

1209. Work study is done with the help of_______________?
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A. none of the above

B. material handling

C. process chart

D. stop watch

E. all of the above

1210. Which of the following is independent of sales forecast______________?
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A. productivity

B. production control

C. inventory control

D. production planning

E. capital budgeting

1211. Which of the following organisations is best suited for steel plants__________________?
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A. functional organisation

B. line, staff and functional organisations

C. staff organisation

D. line organisation

E. scalar organisation

1212. If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited ________________?
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A. acme

B. BSW

C. buttress

D. metric

E. square

1213. The operation of forcing additional air under pressure in the engine cylinder is known as________________?
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A. supercharging

B. scavenging

C. dissociation and carburretion of fuel

D. pre-ignition

E. turbulence

1214. Most high speed compression engines operate on ___________________?
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A. Dual cycle

B. Otto cycle

C. Carnot cycle

D. Two stroke cycle

E. Diesel cycle

1215. The air-fuel ratio of the petrol engine is controlled by__________________?
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A. carburettor

B. scavenging

C. injector

D. governor

E. fuel pump

1216. In nitrated parts, the origins of the fatigue cracks will occur at__________________?
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A. surface

B. within the core

C. just below the surface

D. none of the above

E. could occur anywhere

1217. The mean effective pressure obtained from engine indicator indicates the________________?
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A. minimum pressure

B. exhaust pressure

C. maximum pressure developed

D. instantaneous pressure at any instant

E. average pressure

1218. The rating of a diesel engine, with increase in airintlet temperature, will ___________________?
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A. increase linearly

B. increase parabolically

C. decrease parabolically

D. decrease linearly

E. first decrease linearly and then increase parabolically

1219. Volatility of diesel fuel oil is_________________?
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A. it catches fire without external aid

B. temperature at which it solidifies or congeals

C. indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off

D. minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame

E. temperature at which it flows easily

1220. If two springs are in parallel then their overall stiffness will be_______________?
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A. half

B. same

C. double

D. unpredictable

E. none of the above

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