REFRIGERATION and AIR CONDITIONING MCQ

66.In vapour compression cycle using NH₃ as refrigerant, initial charge is filled at

A. Suction of compressor

B. Delivery of compressor

C. High pressure side close to receiver

D. Low pressure side near receiver

67.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

A.0.2

B.1.2

C.5

D.6

68.Vertical lines on pressure-enthalpy chart show constant

A. Pressure lines

B. Temperature lines

C. Total heat lines

D. Entropy lines

69.A vapour absorption refrigerator uses _________ as a refrigerant.

A. Water

B. Ammonia

C. Freon

D. Aqua-ammonia

70.Which of the following statement is correct for ammonia as a refrigerant?

A. It is toxic to mucous membranes.

B. It requires large displacement per TR compared to fluoro carbons.

C. It reacts with copper and its alloys.

D. All of these