151) Highest pressure encountered in a refrigeration system should be

critical pressure of refrigerant

much below critical pressure

much above critical pressure

near critical pressure

Answer is:

much below critical pressure

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152) If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of - 23°C, then the Carnot COP will be

0.2

1.2

Answer is:

6

153) 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

Ammonia

Carbon dioxide

Freon

Brine

Answer is:

Carbon dioxide

154) Aqua ammonia is used as refrigerant in the following type of refrigeration system

compression

direct

indirect

absorption

Answer is:

absorption

Explanation:

Aqua Ammonia is used as refrigerant in the absorption type of refrigeration system.

155) If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be

same

less

more/less depending on rating

Answer is:

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151) Highest pressure encountered in a refrigeration system should be

much below critical pressure

Heat transfer MCQ with Answers

Related Heat transfer MCQ with Answers

152) If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of - 23°C, then the Carnot COP will be

6

153) 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

Carbon dioxide

154) Aqua ammonia is used as refrigerant in the following type of refrigeration system

absorption

155) If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be

more

Heat transfer MCQ with Answers