mechanical engineering MCQs – Page 167

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 Review each marked answer and report any item that may be outdated or unclear.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

3321. On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by_______________?
0

A. curved line

B. vertical straight line

C. none of the above

D. straight inclined line

E. horizontal straight line

3322. Latent heat of dry steam at atmospneric pressure is equal to____________________?
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A. 100 kcal/kg

B. 427 kcal/kg

C. 539 BTU/lb

D. 471 kcal/kg

E. 539 kcal/kg

3323. In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is__________________?
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A. 40%

B. 50%

C. 80%

D. 90%

E. 25%

3324. Heating wet steam at constant temperature is heating it at constant_________________?
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A. enthalpy

B. pressure

C. none of the above

D. entropy

E. volume

3325. At very low temperature, the melting and boiling temperatures become equal. This temperature is____________________?
0

A. 0K.

B. 300K

C. 373K

D. 273.16K

E. 303K

3326. 100% efficiency of a thermal cycle cannot be achieved because of __________________?
0

A. non-availability of ideal substance

B. frictional losses

C. it is not possible to achieve 0K temperature

D. leakage

E. none of the above

3327. The saturation temperature of steam with increase in pressure increases____________________?
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A. linearly

B. inversely

C. slowly first and then rapidly

D. rapidly first and then slowly

E. none of the above

3328. A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are________________?
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A. none of the above

B. supplied by same manufacturer loose and assembled at site

C. packaged boiler does not exist

D. supplied mounted on a single base

E. purchased from several parties and packed together at site

3329. The specific volume of steam with increase in pressure decreases_____________________?
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A. slowly first and then rapidly

B. linearly

C. none of the above

D. rapidly first and then slowly

E. inversely

3330. Which of the following gases has the highest calorific value ________________?
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A. producer gas

B. coal gas

C. blast furnace gas

D. coke oven gas

E. water gas

3331. The water tubes in a babcock and wilcox boiler are__________________?
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A. vertical

B. horizontal

C. horizontal and inclined

D. inclined

E. vertical and inclined

3332. The shell diameter and length of locomotive boiler are_______________?
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A. 1.5 m, 8 m

B. 1.5 m, 4 m

C. 2 m, 4 m

D. 1 m, 4 m

E. 1.5 m, 6 m

3333. Which of the following varieties of coals is mostly used in steam boilers____________________?
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A. peat

B. non-coking bituminous coal

C. none of the above

D. brown coal

E. coking bituminous coal

3334. The biggest size of thermal power unit operating in India is ________________?
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A. 60 MW

B. 100 MW

C. 500 MW

D. 210 MW

E. 30 MW

3335. The fire tubes in, a Coarran and Scotish marine boiler are_________________?
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A. horizontal

B. vertical

C. inclined

D. both horizontal and vertical

E. horizontal and inclined

3336. Efficiency of a thermal cycle increases by ________________?
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A. regeneration

B. reheating of steam

C. both A. and B.

D. cooling of steam

E. none of the above

3337. The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is___________________?
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A. same

B. could be more or less depending on other factors

C. none of the above

D. more

E. less

3338. Which of the following is steam dbal?
0

A. non-coking bituminous coal

B. pulverised coal

C. none of the above

D. coking bituminous coal

E. brown coal

3339. The specific heat of superheated steam in kcal/kg is generally of the order of___________________?
0

A. 0.1

B. 0.5

C. 1

D. 0.8

E. 0.3

3340. Superheating of steam is done at_________________?
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A. constant pressure

B. constant entropy

C. constant enthaply

D. constant volume

E. constant temperature

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