Aqua ammonia is used as refrigerant in the following type of refrigeration system_________________?
(A) compression
(B) direct
(C) indirect
(D) absorption
(D) none of the above
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
(D) none of the above
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
(D) none of the above
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
(D) 10
Accumulators should have adequate volume to store refrigerant charge at least_________________?
(A) 10%
(B) 25%
(C) 50%
(D) 75%
(D) 100%
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
(D) increase refrigeration effect
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
(D) none of the above
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
(D) condensing temperature of ice
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
(D) none of the above
The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature constant, will______________________?
(A) increase
(B) decrease
(C) remain unaffected
(D) may increase or decrease depending on the type of refrigerant used
(D) unpredictable