- (A) always less than unity
- (B) always more than unity
- (C) equal to unity
- (D) any one of the above
- (E) none of the above
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- (A) increase
- (B) decrease
- (C) remain unaffected
- (D) may increase or decrease depending on the type of refrigerant used
- (E) unpredictable
- (A) high
- (B) low
- (C) optimum
- (D) any value
- (E) there is no such criterion
- (A) increases COP
- (B) decreases COP
- (C) COP remains unaltered
- (D) other factors decide COP
- (E) unpredictable
- (A) ineffective refrigeration
- (B) high power consumption
- (C) freezing automatic regulating valve
- (D) corrosion of whole system
- (E) breakdown of refrigerant
- (A) halide torch which on detection produces greenish flame lighting
- (B) sulphur sticks which on detection gives white smoke
- (C) using reagents
- (D) smelling
- (E) sensing reduction in pressure
- (A) involves no change in volume
- (B) takes place at constant temperature
- (C) takes place at constant entropy
- (D) takes place at constant enthalpy
- (E) takes place at constant pressure
- (A) suction of compressor
- (B) delivery of compressor
- (C) high pressure side close to receiver
- (D) low pressure side near receiver
- (E) anywhere in the cycle
- (A) condensation of the refrigerant vapour
- (B) evaporation of the refrigerant liquid
- (C) compression of the refrigerant vapour
- (D) metering of the refrigerant liquid
- (E) none of the above
- (A) compressor
- (B) condenser
- (C) evaporator
- (D) expansion valve
- (E) all of the above
