Refrigeration and Air Conditioning MCQ. Multiple Choice Questions on Refrigeration and Air Conditioning. Interview questions on Refrigeration and Air Conditioning (RAC)
1- In SI unit, one ton of refrigeration is equal to
(A) 210 J/min
(B) 21 kJ/min
(C) 21 J/min
(D) 210 kJ/min
2- The refrigerant, commonly used in vapor absorption system, is
(A) Nitrogen
(B) Air
(C) Freon
(D) Aqua-ammonia
3- In refrigeration system, throttle valve is a _______.
(A) Expansion device
(B) Compression device
(C) Condensation device
(D) Evaporation device
4- An Electrolux refrigerator is a
(A) vapor compression refrigerator
(B) vapor absorption refrigerator with a liquid pump
(C) vapor absorption refrigerator without any pump
(D) none of the above
5- In a refrigerator, heat is rejected with the help of which device?
(A) compressor
(B) condenser
(C) evaporator
(D) capillary tube
6- Which of the following refrigerant has the lowest freezing point?
(A) R-11
(B) R-12
(C) R-22
(D) Ammonia
7- The coefficient of performance of a refrigerator is
(A) ratio of input to output
(B) ratio of refrigeration effect to work input
(C) ratio of work input to refrigeration effect
(D) ratio of heat rejected to heat absorbed
8- Following is true about COP of heat pump and COP of refrigerator:
(A) COPHeat pump > COPRefrigerator
(B) COPHeat pump < COPRefrigerator
(C) COPHeat pump = COPRefrigerator
(D) COPHeat pump X COPRefrigerator = 1
9- The highest temperature during the cycle, in a vapor compression refrigeration system, occurs after
(A) Compression
(B) Condensation
(C) Expansion
(D) Evaporation
10- Wet compression vapor compression refrigeration cycle means
(A) Vapor compression takes place in wet region
(B) Vapor compression in dry region, but evaporation in wet region
(C) Vapor compression in wet region, but leaves in super-heated region
(D) None of the above
11- The sub-cooling is a process of cooling the refrigerant in vapor compression refrigeration system
(A) Before compression
(B) After compression
(C) Before throttling
(D) After throttling
12- The order in which main components of vapor compression of refrigeration system are used is
(A) Compressor-Evaporator-Condenser-Throttle valve
(B) Compressor-Condenser-Evaporator-Throttle valve
(C) Compressor-Condenser-Throttle valve-Evaporator
(D) Compressor-Throttle valve-Evaporator-Condenser
13- In a vapor compressor refrigeration system, the lowest temperature during the cycle occurs after
(A) compression
(B) condensation
(C) expansion
(D) evaporation
14- The color of flame of halide torch in case of leakage of refrigerant will change to
(A) yellow
(B) orange
(C) bright green
(D) red
ANSWERS:
1-(D), 2-(D), 3-(A), 4-(C), 5-(B), 6-(C), 7-(B), 8-(A), 9-(A), 10-(A), 11-(C), 12-(C), 13-(C), 14-(C)