571. The value of COP in vapour compression cycle is usually__________________?
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

572. Condensing temperature in a refrigerator is the temperature_________________?
A. of cooling medium
B. of freezing zone
C. of evaporator
D. at which refrigerant gas becomes liquid
E. condensing temperature of ice

573. In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be_________________?
A. high, of the order of 25°
B. as low as possible (3 to 11°C)
C. zero
D. any value
E. none of the above

574. In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to___________________?
A. collect liquid refrigerant and prevent it from going to compressor
B. detect liquid in vapour
C. superheat the vapour
D. collect vapours
E. increase refrigeration effect

575. Accumulators should have adequate volume to store refrigerant charge at least_________________?
A. 10%
B. 25%
C. 50%
D. 75%
E. 100%

576. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. The Cannot coefficient of performance of cycle will be_________________?
A. 0.2
B. 1.2
C. 5
D. 6
E. 10

577. In vapor compression refrigeration system, refrigerant occurs as liquid between_________________?
A. condenser and expansion valve
B. compressor and evaporator
C. expansion valve and evaporator
D. compressor and condenser
E. none of the above

578. Efficiency of a Carnot engine is given as 80%. If the- cycle direction be reversed, what will be the value of COP of reversed Carnot cycle_________________?
A. 1.25
B. 0.8
C. 0.5
D. 0.25
E. none of the above

579. Aqua ammonia is used as refrigerant in the following type of refrigeration system_________________?
A. compression
B. direct
C. indirect
D. absorption
E. none of the above

580. If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of – 23°C, then the Carnot COP will be_________________?
A. 0.2
B. 1.2
C. 5
D. 6
E. 10

NOTE
IF YOU THINK ANY OF THE MCQ ABOVE IS WRONG.
PLEASE COMMENT WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION IN COMMENT BOX.
THANK YOU

This Post Has One Comment

Leave a Reply