Refrigeration And Air Conditioning MCQ Questions & Answers | Mechanical Engineering

A. Condenser and expansion valve

B. Compressor and evaporator

C. Expansion valve and evaporator

D. Compressor and condenser

A. Kinetic theory of gases

B. Newton's law of gases

C. Dalton's law of partial pressures

D. Avogadro's hypothesis

A. The value of C.O.P. is always greater than one

B. In a vapour compression system, the condition of refrigerant before entering the compressor is dry saturated vapour

C. The space between the saturated liquid line and saturated vapour line, in a pressure enthalpy chart, is wet vapour region

D. None of the above

A. The performance of the vapour compression refrigerator varies considerably with both vaporising and condensing temperatures.

B. In vapour compression cycle, the useful part of the heat transfer is at the condenser.

C. In ammonia-hydrogen (Electrolux) refrigerator, no compressor, pump or fan is required.

D. The effect of under-cooling the liquid refrigerant is to decrease the coefficient of performance.

A. 210 kJ/ min

B. 21 kJ/ min

C. 420 kJ/ min

D. 840 kJ/ min

A. System has high C.O.P.

B. Power per TR is low

C. Mass of refrigerant circulated in the system is low

D. Mass of the refrigeration equipment is low

A. Condenser

B. Evaporator

C. Absorber

D. None of these

A. Carnot cycle

B. Reversed Carnot cycle

C. Rankine’s cycle

D. Brayton cycle

A. $$\frac{{{{\text{T}}_1}\left( {{{\text{T}}_2} - {{\text{T}}_3}} \right)}}{{{{\text{T}}_3}\left( {{{\text{T}}_1} - {{\text{T}}_2}} \right)}}$$

B. $$\frac{{{{\text{T}}_3}\left( {{{\text{T}}_1} - {{\text{T}}_2}} \right)}}{{{{\text{T}}_1}\left( {{{\text{T}}_2} - {{\text{T}}_3}} \right)}}$$

C. $$\frac{{{{\text{T}}_1}\left( {{{\text{T}}_1} - {{\text{T}}_2}} \right)}}{{{{\text{T}}_3}\left( {{{\text{T}}_2} - {{\text{T}}_3}} \right)}}$$

D. $$\frac{{{{\text{T}}_3}\left( {{{\text{T}}_2} - {{\text{T}}_3}} \right)}}{{{{\text{T}}_1}\left( {{{\text{T}}_1} - {{\text{T}}_2}} \right)}}$$

A. A gas will never liquefy

B. A gas will immediately liquefy

C. Water will evaporate

D. Water will never evaporate