( Best 60+ ) REFRIGERATION and AIR CONDITIONING MCQ

by Mr. DJ

REFRIGERATION and AIR CONDITIONING MCQ

21.The optimum effective temperature for human comfort is

A. Higher in winter than in summer

B. Lower in winter than in summer

C. Same in winter and summer

D. Not dependent on season

22.An evaporator is also known as

A. Freezing coil

B. Cooling coil

C. Chilling coil

D. All of these

23.In a refrigeration cycle, the flow of refrigerant is controlled by

A. Compressor

B. Condenser

C. Evaporator

D. Expansion valve

24.Vapour compression refrigeration is somewhat like

A. Carnot cycle

C. Reversed Carnot cycle

D. None of the above

25.At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

A. decreases

B. increases

C. remains same

D. depends on other factors

26.A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. The Carnot coefficient of performance of cycle will be

A.0.2

B.1.2

C.5

D.6

27.The bypass factor (B. P. F.) in case of sensible heating of air is (Where td₁ = Dry bulb temperature of air entering the heating coil, td₂ = Dry bulb temperature of air leaving the heating coil, and td₃ = Dry bulb temperature of heating coil)

A.(td₂ – td₃)/(td₃ – td₁)

B.(td₃ – td₂)/(td₃ – td₁)

C.(td₃ – td₁)/(td₂ – td₃)

D.(td₃ – td₁)/(td₃ – td₂)

28.The general rule for rating refrigeration systems (excepting for CO₂ system) is to approximate following h.p. per ton of refrigeration

A.0.1 to 0.5 h.p. per ton of refrigeration

B.0.5 to 0.8 h.p. per ton of refrigeration

C.1 to 2 h.p. per ton of refrigeration

D.2 to 5 h.p. per ton of refrigeration

29.The freezing point of R-12 is

A.-86.6°C

B.-95.2°C

C.-107.7°C

D.-135.8°C

30.The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by

A.(C.O.P.)P = (C.O.P.)R + 2

B.(C.O.P.)P = (C.O.P.)R + 1

C.(C.O.P)P = (C.O.P)R – 1

D.(C.O.P)P = (C.O.P)R

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