1000+ Refrigeration and Air Conditioning GATE Interview Questions - 2

Question: 6

The secondary refrigerant used in milk chilling plants is usually

(A) sodium silicate

(B) glycol

(C) ammonia solution

(D) brine

Question: 7

Frost on cooling coils

(A) acts as an insulation, increasing power consumption

(B) reduces power consumption

(C) improves COP of the system

(D) increases heat transfer

Question: 8

Refrigerant R- 744 is

(A) Air

(B) Ammonia

(C) Freon 12

(D) Carbon dioxide

Question: 9

The critical temperature is the temperature

(A) above which a gas may explode

(B) below which a gas does not obey gas laws

(C) above which a gas will never be liquefied

(D) below which gas is always liquefied

Question: 10

In an aircraft refrigeration system, the pressure at the cooling turbine outlet is equal to

(A) evaporator pressure

(B) ambient pressure

(C) cabin pressure

(D) compressor inlet pressure