Refrigeration and Air Conditioning - Interview Questions | Exam2Win

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76. Which of the following refrigerants has lowest freezing point

A. Freon-12

B. NH3

C. C02

D. Freon-22

E. S02.

Explanation:

77. Reducing suction pressure in refrigeration cycle

A. lowers evaporation temperature

B. increases power required per ton of refrigeration

C. lowers compressor capacity because vapour is lighter

D. reduces weight displaced by piston

E. all of the above.

Explanation:

78. A standard ice point temperature corresponds to the temperature of

A. water at 0�C

B. ice at - 4�C

C. solid and dry ice

D. mixture of ice, water and vapour under equilibrium conditions under NTP conditions

E. mixture of ice and water Under equilibrium conditions.

Explanation:

79. The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is

A. same

B. more

C. less

D. more or less depending on ambient conditions

E. unpredictable.

Explanation:

80. The advantage of dry compression is that

A. it permits higher speeds to be used

B. it permits complete evaporation in the evaporator

C. it results in high volumetric and mechanical efficiency

D. all of the above

E. none of the above.

Explanation:

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