mechanical engineering MCQs – Page 66

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 Review each marked answer and report any item that may be outdated or unclear.

1301. Works cost implies________________?
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A. none of the above

B. factory expenses

C. factory cost

D. primary cost + factory expenses

E. primary cost

1302. The connecting rod bolts are tightened up with initial tension greater than the external load so that___________________?
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A. the resultant load on the bolt would not be affected by the external cyclic load

B. bolts will not loosen during service

C. joint may not open up

D. bolts are weakest elements

E. none of the above

1303. The maximum temperature in the I.C. engine cylinder is of the order of ________________?
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A. 2000-2500C

B. 500- 1000C

C. 1500-2000C

D. 1000- 1500C

E. 2500-3000C

1304. In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia of rivet d should be equal to__________________?
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A. 1.25 d

B. 1.75 d

C. d

D. 1.5 d

E. 2 d.

1305. The theoretically correct air fuel ratio for petrol engine is of the order of___________________?
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A. 15 : 1

B. 12:01

C. 9:01

D. 20:01

E. 6:01

1306. In cross or regular lay ropes_________________?
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A. wires in two adjacent strands are twisted in opposite direction

B. direction of twist of wires in strands is opposite to the direction of twist of strands

C. direction of twist of wires and strands are same

D. none of the above

E. wires are not twisted

1307. Oil in journal bearing should be applied at the point where load is________________?
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A. any one of the above

B. unpredictable

C. average

D. nil or lightest

E. maximum

1308. The function of cutting oil when threading a pipe is to___________________?
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A. lubricate the dies

B. all of the above

C. provide cooling action

D. help remove chips

E. none of the above

1309. A backing ring is used inside the pipe joint when making a___________________?
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A. socket weld

B. sleeve weld

C. fillet weld

D. tube weld

E. butt weld
1310. The thermal efficiecny of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will___________________?
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A. be independent

B. none of the above

C. may increase or decrease depending on other factors

D. increase

E. decrease
1311. In Halsey 50-50 plan, output standards are established______________?
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A. all of the above

B. from ones judgement

C. from previous production records

D. none of the above

E. by time study

1312. Basic tool in work study is __________________?
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A. planning chart

B. process chart

C. stop watch

D. graph paper

E. analytical mind

1313. Which is correct statement ?
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A. a member made of steel will generally be more rigid than a member of equal load-carrying ability made of cast iron

B. a member made of cast iron will generally be. more rigid than a member of equal load carrying ability made of steel

C. both will be equally rigid

D. which one is rigid will depend on several other factors

E. none of the above

1314. Basic shaft is one__________________?
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A. none of the above

B. whose upper deviation is zero

C. whose lower deviation is zero

D. whose lower as well as upper deviations are zero

E. does not exist

1315. In which of the following layouts, the lines need to the balanced_______________?
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A. process layout

B. fixed position layout

C. product layout

D. functional layout

E. plant layout

1316. For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately________________?
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A. 0.8 times

B. 0.9 times the normal diameter of bolt

C. 0.6 times

D. 0.4 times

E. 0.7 times

1317. Spring stiffness is__________________?
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A. its capability of storing energy

B. its ability to absorb shocks

C. none of the above

D. ratio of coil diameter to wire diameter

E. load required to produce unit deflection
1318. Octane number is determined by comparing the performance of the petrol with the following hydrocarbons__________________?
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A. alpha methyl napthalene

B. mixture of normal heptane and iso-oc-tane

C. mixture of methane and ethane

D. iso-octane

E. mixture of paraffins and aromatics

1319. The efficiency of I.C. engines normally is of the order of_________________?
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A. 25-30%

B. 15-20%

C. 35-50%

D. 30-35%

E. 20-25%

1320. Fuel consumption with increase in back pressure will________________?
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A. increase

B. remain unaffected

C. decrease

D. depend on other factors

E. none of the above