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In a refrigeration cycle, the flow of refrigerant is controlled by___________________?

A. Compressor
B. Condenser
C. Evaporator
D. Expansion valve

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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

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Aqua ammonia is used as refrigerant in the following type of refrigeration system_________________?

A. Compression
B. Direct
C. Indirect
D. Absorption

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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

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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

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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

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Accumulators should have adequate volume to store refrigerant charge at least_________________?

A. 10%
B. 25%
C. 50%
D. 75%

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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

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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

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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

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