mechanical engineering MCQs – Page 63

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 Review each marked answer and report any item that may be outdated or unclear.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

1241. Transverse fillet welded joints are designed for________________?
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A. compressive strength

B. shear strength

C. torsional strength

D. tensile strength

E. bending strength

1242. Which of the following is the lightest and most volatile liquid fuel________________?
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A. kerosene

B. fuel oil

C. gasoline

D. lub oil

E. diesel

1243. Shear stress theory is applicable for____________________?
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A. none of the above

B. brittle materials

C. elastic materials

D. all of the above

E. ductile fnaterials

1244. The building up of worn and uridersized parts, subjected to repeated loads by electroplating is_____________________?
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A. extremely hazardous

B. best method

C. has no effect as regards fatigue strength

D. all of the above

E. cheapest method

1245. Belt slip may occur due to________________?
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A. loose belt

B. none of the above

C. all of the above

D. heavy load

E. driving pulley too small

1246. A diesel engine as compared to petrol engine (both running ar rated load) is ____________________?
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A. other factors will decide it

B. unperdictable

C. less efficient

D. equally efficient

E. more efficient

1247. The rated life of a bearing varies___________________?
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A. inversely as fourth power of load

B. none of the above

C. directly as load

D. inversely as square of load

E. inversely as cube of load

1248. When a nut is tightened by plaping a washer below it, the bolt will be subjected to following type of loads___________________?
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A. shear

B. combined loads

C. all of the above

D. compression

E. tension

1249. A heat engine utilises the_________________?
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A. low heat value of

B. all of the above

C. high heat value of oil

D. mean heat value of oil

E. calorific value of oil

1250. Fibrous fracture occurs in_____________?
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A. ductile material

B. all of the above

C. elastic material

D. hard material

E. brittle material

1251. The knock in diesel engine occurs due to____________________?
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A. delayed burning of the first part of the charge

B. instantaneous and rapid burning of the first part of the charge

C. reduction of delay period

D. all ot the above

E. instantaneous atuo iginition of last part of charge

1252. The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is__________________?
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A. same

B. less

C. unpredictable

D. more

E. more or less depending on power rating

1253. The main advantage of line organisation is its_______________?
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A. rigid discipline in the organisation

B. all of the above

C. effective command and control

D. defined responsibilities at all levels

E. ability of quick decision at all levels

1254. In loop scavenging, the top of the piston is________________?
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A. flat

B. contoured

C. depressed

D. convex shaped

E. slanted

1255. Crankcase explosion in I.C. engines usuall occurs as ___________________?
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A. first a mild explosion followed by a bi explosion

B. first a big explosion followed by a mil explosion

C. both mild and big explosions occi simultaneously

D. never occurs

E. unpredictable

1256. The designation M 33 x 2 of a bolt means___________________?
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A. metric threads of 33 mm outside diameter and 2 mm pitch

B. metric threads with cross-section of 33 mm

C. bolt of 33 mm nominal diameter having 2 threads per cm

D. none of the above

E. metric threads of 33 nos in 2 cm.

1257. In a typical medium speed 4 stroke cycle diesel engine_______________?
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A. may open and close anywhere

B. exhaust valve opens just after bottom dead center and closes just before top dead center

C. exhaust valve opens at 35 before bot-tom dead center and closes at 20 after top dead center

D. none of the above is true

E. exhaust valve opens at bottom dead center and closes at top dead center

1258. The following volume of air is required for consuming 1 liter of fuel by a four stroke engine_______________?
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A. 9-10 m3

B. 5-6 m3

C. 15-18 m3

D. 5 m3

E. 1 m3

1259. Taper on the cotter and slot is provided_________________?
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A. on both the sides

B. on one side only

C. on none of the sides

D. may be provided anywhere

E. none of the above

1260. Whether any core is required in wire ropes________________?
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A. very often

B. no

C. yes

D. rarely

E. sometimes

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