mechanical engineering MCQs – Page 65

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 Review each marked answer and report any item that may be outdated or unclear.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

1281. Castle nut is a locking device in which__________________?
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A. a slot is cut partly is middle of nut and then slot reduced by tightening a screw

B. a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

C. through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end

D. none of the above.

E. one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

1282. If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the________________?
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A. piston rings would stick into piston grooves

B. exhaust will be smoky

C. scavenging occurs

D. exhaust temperature will be high

E. engine starts overheating

1283. The reason for supercharging in any engine is to________________?
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A. increase power

B. effect fuel economy

C. none of the above

D. reduce weight and bulk for a given out-put

E. increase efficiency

1284. Work study is most useful_______________?
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A. where men are biggest contributor to success of a project

B. in improving industrial relations

C. in judging the rating of machines

D. in judging the output of a man and improving it

E. where production activities are involved

1285. All heat engines utilize_____________________?
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A. net claorific value of oil

B. low heat value of oil

C. high heat value of oil

D. calorific value of fuel

E. all of the above

1286. Rivets are generally specified by_______________?
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A. nominal diameter

B. length of rivet

C. all of the above

D. thickness of plates to be riveted

E. diameter of head

1287. Jam nut is a locking device in which _____________________?
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A. through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end

B. none of the above

C. one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

D. a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

E. a slot is cut partly in middle of nut and then slot reduced by tightening a screw

1288. The strap end of a connecting rod of steam engine is joined by_________________?
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A. universal coupling

B. sleeve and cotter joint

C. knuckle joint

D. spigot socket cotter joint

E. gib of cotter joint

1289. Engine pistons are usually made of aluminium alloy because it_________________?
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A. wears less

B. is stronger

C. does not react with fuel and lub oil

D. absorbs shocks

E. is lighter

1290. Compression ratio of LC. engines is ___________________?
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A. volume displaced by piston per stroke and clearance volume in cylinder

B. the ratio of volumes of air in cylinder before compression stroke and after compression stroke

C. ratio of pressure after compression and before compression

D. swept volume/cylinder volume

E. cylinder volume/swept volume

1291. The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is_________________?
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A. larger

B. equal

C. larger/smaller depending on diameter of spring coil

D. unpredictable

E. smaller

1292. Machine screws are________________?
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A. similar to small size tap bolts except that a greater variety of shapes of heads are available

B. slotted for a screw driver and generally used with a nut

C. similar to stud

D. used to prevent relative motion be-tween two parts

E. none of the above

1293. The resultant axial load on a bolt depends on_______________?
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A. external load applied

B. initial tension

C. relative elastic yielding (springness) of the bolt and the connected member

D. A, B. and C. above

E. A. and B. above

1294. Acceptance sampling is widely used in________________?
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A. mass production

B. all of the above

C. batch production

D. none of the above

E. job production

1295. Gear box is used___________________?
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A. to produce torque

B. to damp out vibrations

C. to increase efficiency of system

D. to obtain variable speeds

E. for speed reduction

1296. Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged ?
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A. depends on other factors

B. no

C. to some extent

D. unpredictable

E. yes

1297. For applications involving high stresses in one direction only the following type of thread would be best suited______________________?
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A. square thread

B. British Association thread

C. buttress thread

D. acme thread

E. ISO metric thread

1298. Supercharging is the process of_____________________?
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A. providing forced cooling air

B. injecting excess fuel for raising more load

C. supplying compressed air to remove combustion products fully

D. raising exhaust pressure

E. supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere

1299. Templates are used for_________________?
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A. a planning layout

B. advancing a programme in automatic machines

C. copying complicated profiles

D. flow of material

E. none of the above

1300. Motion study is used for________________?
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A. ose the wrong statement?

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