mechanical engineering MCQs – Page 56

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 Review each marked answer and report any item that may be outdated or unclear.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

1101. The pressure and temperature at the end of compression stroke in a petrol engine are of the order of___________________?
0

A. 6 12 kg/cm2 and 250 350C

B. 30 40 kg/cm2 and 500 700C

C. 20 30 kg/cm2 and 450 500C

D. 4 6 kg/cm2 and 200 250C

E. 12 20 kg/cm2 and 350 450C

1102. ABC analysis deals with_________________?
0

A. controlling inventory costs money

B. all of the above

C. analysis of process chart

D. flow of material

E. ordering schedule of job

1103. The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of____________?
0

A. 0.45

B. 0.25

C. 0.75

D. 0.65

E. 0.55

1104. The air-fuel ratio in petrol engines-is controlled by__________________?
0

A. carburettion

B. governing

C. controlling valve opening/closing

D. injection

E. scavenging and supercharging

1105. In hydrostatic bearings ____________________?
0

A. do not require external supply of lubricant

B. none of the above

C. the Oil film pressure is generated only by the rotation of the journal

D. grease is used for lubrication

E. the oil film is maintained by supplying oil under pressure

1106. In a cycle, the spark lasts roughly for ____________________?
0

A. 0.1 sec

B. 0.001 sec

C. 1 sec

D. 0.01 sec

E. 0.0001 sec

1107. In order to permit the thermal expansion/contraction of tubing, it should be______________?
0

A. crimped

B. honed

C. bent

D. flared

E. none of the above

1108. Aircraft body is usually fabricated by_________________?
0

A. precasting

B. casting

C. rivetting

D. unconventional methods

E. welding

1109. Most high speed compression engines operate on __________________?
0

A. Otto cycle

B. Carnot cycle

C. Diesel cycle

D. Dual combustion cycle

E. Special type of air cycle

1110. In oilness bearings________________?
0

A. none of the above

B. grease required to be applied after some intervals

C. do not require external supply of lubricant

D. the oil film is maintained by supplying oil under pressure

E. the oil film pressure is generated only by the rotation of the journal

1111. Military organisation is known as_______________________?
0

A. all of the above

B. line and staff organisation

C. none of the above

D. functional organisation

E. line organisation

1112. A bench vice has following type of threads____________________?
0

A. metric

B. BSW

C. square

D. acme

E. buttress

1113. Eye bolts are used for_________________?
0

A. locking devices *

B. foundation purposes

C. lifting and transportation of machines and cubicles

D. transmission of power

E. absorbing shock and vibrations

1114. The amount deducted from the salary of workers towards employees provident fund is_______________?
0

A. deposited in the account of worker with Provident Fund Commissioner

B. credited into reserves of company

C. deposited in the account of worker with employer or Reserve Bank of India

D. deposited in post office

E. deposited in nationalised bank

1115. Scavenging is usually done to increase__________________?
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A. power output

B. thermal efficiency

C. speed

D. all of the above

E. fuel consumption

1116. In a diesel engine, the fuel is ignited by___________________?
0

A. spark

B. heat resulting from compressing air that is supplied for combustion

C. combustion chamber

D. ignition

E. injected fuel

1117. Supercharging is essential in_____________?
0

A. petrol engines

B. aircraft engines

C. gas turbines

D. diesel engines

E. marine engines

1118. Ball bearing type screws are found in following application_____________________?
0

A. bench vice

B. crane

C. steering mechanism

D. aeroplane engines

E. screw jack

1119. For a product layout the material handling equipment must _________________?
0

A. employ conveyor belts, trucks, tractors etc.

B. arranging shops according to specialization of duties

C. be designed as special purpose for a particular application

D. have full flexibility

E. be a general purpose type

1120. At low temperatures (say 75C) the notched-bar impact value of steel____________________?
0

A. depends on heat treatment carried out

B. increases markedly

C. decreases markedly

D. remains same

E. none of the above

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