mechanical engineering MCQs – Page 57

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 Review each marked answer and report any item that may be outdated or unclear.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

1121. If the intake air temperature of I.C. engine increases, its efficiency will_________________?
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A. decrease

B. unpredictable

C. depend on other factors

D. increase

E. remain same

1122. The cam shaft of a four stroke I.C. engine running at 1500 rmp will run at __________________?
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A. 750 rpm

B. any value independent of engine speed

C. none of the above

D. 3000 rpm

E. 1500 rpm

1123. Diesel engine can work on very lean air fuel ratio of the order of 30 : 1. A petrol engine can also work on such a lean ratio provided__________________?
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A. it is properly designed

B. best quality fuel is used

C. flywheel size is proper

D. engine cooling is stopped

E. can not work as it is impossible

1124. A 5 BHP engine running at full load would consume diesel of the order of_________________?
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A. 1 kg/hr

B. 10 kg/hr

C. 0.3 kg/hr

D. 3 kg/hr

E. 5 kg/hr

1125. For tight leakage joints, following type of thread is best suited ____________________?
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A. square

B. acme

C. NPT (national pipe threads)

D. buttress

E. metric

1126. Taper usually provided on cotter is_________________?
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A. 1 in 5

B. 1 in 24

C. 1 in 40

D. 1 in 10

E. 1 in 50

1127. The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft___________________?
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A. 2

B. 2-Jan

C. 1

D. 8

E. 4

1128. The edges of a boiler plate are bevelled to an angle of______________?
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A. 85.

B. 45

C. 80

D. 60

E. 30

1129. What does symbol D imply in work study ___________________?
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A. permanent storage

B. delay/temporary storage

C. inspection

D. transport

E. none of the above

1130. Applications in which stresses are encountered in one direction only uses following type of threads____________________?
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A. buttress

B. acme

C. metric

D. BSW

E. square

1131. Compression loss in I.C engines occurs due to_________________?
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A. use of thick head gasket

B. leaking piston rings

C. all of the above

D. increase in clearance volume caused b bearing-bushing wear

E. clogged air-inlet slots

1132. Inventory control in production, planning and control aims at________________?
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A. acceptable customer service at low capital investment in inventory

B. regulate supply and demand

C. achieving optimisation

D. discounts allowed in bulk purchase

E. ensuring against market fluctuations

1133. Under the Apprenticeship Act___________________?
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A. industries have to train apprentices ac-cording to their requirement

B. all industries have to necessarily train the apprentices

C. all industries other than small scale industries have to train apprentices

D. only industries employing more than 500 workers have to recruit apprentices

E. all industries employing more than 100 workers have to recruit apprentices

1134. Resistance to fatigue of a material is measured by________________?
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A. coefficient of elasticity

B. elastic limit

C. endurance limit

D. ultimate tensile strength

E. Youngs modulus

1135. The inlet value of a four stroke cycle I.C engine remains open for nearly___________________?
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A. 180

B. 235

C. 125

D. 200

E. 275

1136. When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at_______________?
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A. in the middle

B. anywhere in the bolt

C. at the thread

D. shank

E. head

1137. In the crankcase method of scavenging, the air pressure is produced by_________________?
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A. movement of engine piston

B. reciprocating pump

C. centrifugal pump

D. supercharger

E. natural aspirator

1138. Three different weights fall from a certain height under vacuum. They will take______________?
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A. times inversely proportional to weight to reach earth

B. unpredictable

C. none of the above

D. same time to reach earth

E. times proportional to weight to reach earth

1139. The valve rod in a steam engine is connected to an eccentric rod by_________________?
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A. gib and cotter joint

B. bolted joint

C. kunckle joint

D. cotter joint

E. universal coupling

1140. In micromotion study, therblig is described by_______________?
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A. micro motions

B. an event

C. a symbol

D. an activity

E. standard symbol and colour

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