mechanical engineering MCQs – Page 62

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 Review each marked answer and report any item that may be outdated or unclear.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

1221. Which of the following is false statement. Some of the methods used to reduce diesel smoke are as follows ________________?
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A. engine derating i.e. reducing the maxi-mum flow of fuel

B. increasing the compression ratio

C. using additives in the fuel

D. adherence to proper fuel specification

E. avoidance of overloading

1222. The grouping of activities into organisational units is called_________________?
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A. corporate plans

B. departmentatidn

C. company policy

D. functional authority

E. higher level management

1223. In composite or reverse laid ropes___________________?
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A. wires are not twisted

B. wires in two adjacent strands are twisted in opposite direction

C. direction of twist of wires and strands are same

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

E. none of the above

1224. The shear plane in case of bolts should_________________?
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A. be parallel to axis of bolt

B. be normal to threaded portion of shank

C. be across threaded portion of shank

D. never be across the threaded portion

E. none of the above

1225. If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by________________?
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A. Zp/N

B. ZN/p

C. Z/pN

D. N/Zp

E. p/ZN

1226. The function of a washer is to___________________?
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A. provide bearing area

B. provide cushioning effect

C. act as a locking device

D. absorb shocks and vibrations

E. provide smooth surface in place of rough surface

1227. In hydrodynamic bearings_____________________?
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A. grease is used for lubrication

B. none of the above

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

1228. Pour point of fuel oil is the_________________?
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A. minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame

B. temperature at which it solidifies or congeals

C. it catches fire without external aid

D. temperature at which it flows easily

E. indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off

1229. A stud________________________?
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A. has a head on one end and a nut fitted to the other

B. has head at one end and other end fits into a tapped hole in the other part to be joined

C. has both the ends threaded

D. has pointed threads

E. requires locking nuts

1230. A tube has the following advantage over pipe_________________?
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A. greater shock absorption