mechanical engineering MCQs – Page 214

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 Review each marked answer and report any item that may be outdated or unclear.

4261. Highest pressure encountered in a refrigeration system should be________________?
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A. near critical pressure

B. there is no such restriction

C. much below critical pressure

D. much above critical pressure

E. critical pressure of refrigerant

4262. Highest temperature encountered in refrigeration cycle should be________________?
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A. could be anywhere

B. much below critical temperature

C. above critical temperature

D. near critical temperature of refrigerant

E. at critica. temperature

4263. If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be________________?
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A. more

B. more/less depending on rating

C. less

D. same

E. unpredictable

4264. One of the purposes of sub-cooling the liquid refrigerant is to________________?
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A. ensure that only liquid and not the vapour enters the expansion (throttling) valve

B. reduce compressor discharge temperature

C. reduce compressor overheating

D. increase cooling effect

E. none of the above

4265. A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is________________?
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A. Ammonia

B. Carbon dioxide

C. Freon

D. Brine

E. Hydrocarbon refrigerant

4266. Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system ?
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A. ammonia vapour to strong solution

B. strong solution to weak solution

C. weak solution to strong solution

D. strong solution to ammonia vapour

E. ammonia vapour to weak solution