mechanical engineering MCQs – Page 64

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 Review each marked answer and report any item that may be outdated or unclear.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

1261. The ultimate strength of steel in tension in comparison to shear is in the ratio of__________________?
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A. 1 : l

B. 1:02

C. 2:01

D. 2:03

E. 3 : 2

1262. Cold working________________?
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A. decreases the fatigue strength

B. alone has no influence on fatigue strength

C. increases the fatigue strength

D. has no influence on fatigue strength

E. none of the above

1263. Form coefficient of spring is _____________________?
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A. load required to produce unit deflection

B. ratio of coil diameter to wire diameter

C. nothing

D. concerned With strength of wire of spring

E. its capability of storing energy

1264. In case of gas turbines, the gaseous fuel consumption guarantees are based on________________?
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A. net calorific value

B. calorific value

C. high heat value

D. middle heat value

E. low heat value

1265. The air requirement of a petrol engine during starting compared to theoretical airequired for complete combustion is___________________?
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A. more

B. loss

C. may be more or less depending on engine capacity

D. unpredictable

E. same

1266. Which of the following is not an interns combustion engine___________________?
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A. steam turbine

B. 2-stroke petrol engine

C. diesel engine

D. 4-stroke petrol engine

E. gas turbine

1267. Fuel consumption of diesef engines is not guaranteed at one quarter load because at such low loads________________?
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A. none of the above

B. the friction is high

C. the small difference in cooling water temperature or in internal friction has a disproportionate effect

D. the friction is unpredictable

E. the engine is rarely operated

1268. If threads on a bolt are left hand, threads on nut will be_____________________?
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A. could be left or right hand

B. right hand with same pitch

C. left hand with same pitch

D. right hand with fine pitch

E. left hand with fine pitch

1269. Micromotion study involves following number of fundamental hand motions_______________?
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A. 8

B. 20

C. 24

D. 12

E. 16

1270. The permissible stress for carbon steel under static loading is generally taken as__________________?
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A. 3000-4000 kg/cm2

B. 4000-4500 kg/cm2

C. 10,000-15,000 kg/cm2

D. 2000-3000 kg/pm2

E. 7500-10,000 kg/cm2

1271. Turn buckle has____________________?
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A. right hand threads on bout ends

B. left hand threads on both ends

C. left hand threads on one end and right hand threads on other end

D. no threads

E. threads in middle portion

1272. A 75 cc engine has following parameter as 75 cc ___________________?
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A. clearance volume

B. swept volume

C. fuel tank capacity

D. cylinder volume

E. lub oil capacity

1273. Silver-based solder is used for__________________?
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A. flaring

B. none of the above

C. brazing

D. fusion welding

E. soft soldering

1274. The included angle in unified of American National threads is___________________?
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A. 47

B. 55

C. none of the above

D. 29

E. 60

1275. Set screws are_________________?
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A. used to prevent relative motion be-tween parts

B. slotted for a screw driver and generally used with a nut

C. similar to small size tap bolts except that a greater variety of shapes of heads are available

D. similar to stud

E. none of the above

1276. When crude oil is heated, then which of the following hydrocarbon is given off first______________?
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A. kerosene

B. natural gas

C. gasoline

D. diesel

E. paraffin

1277. In diesel engine, the compression ratio in comparison to expansion ratio is_______________?
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A. more

B. less

C. variable

D. more/less depending on engine capacity.

E. same

1278. Inventory management consists of__________________?
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A. state of merchandise methods of stroing and maintenance etc

B. effective running of stores

C. all of the above

D. none of the above

E. stock control system

1279. An engine indicator is used to determine the following___________________?
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A. volume of cylinder

B. BHP

C. speed

D. m.e.p. and I.H.P.

E. temperature

1280. The pressure at the end of compression in the case of diesel engine is of the order of___________________?
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A. 20 kg/cmz

B. 35 kg/cm

C. 27.5 kg/cmz

D. 12kg/cmz

E. 6 kg/cm

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