Refrigeration and Air-Conditioning

1.The function of burning Sulphur candle

A) superheating the vapour refrigerant
B) Defrosting of the cooling coil
C) detecting the leakage of the amonia refrigerant
D) None of the above

... Answer is C)
Detecting the leakage of ammonia refrigerant
 

2. Air refrigeration system work on

A) Carnot cycle
B) Stirling cycle
C) Rankine cycle
D) Bell-coleman cycle

... Answer is D) Bell-coleman cycle

3. A bootstrap air refrigeration system has...

A) one heat exchanger
B) two heat exchanger
C) three heat exchanger
D)Four heat exchanger

... Answer is B) two heat exchanger

 

4. Which of the following air refrigeration is commonly used for transport aircraft ?

A) Simple air refrigeration system
B) Regenerative air refrigeration system
C) Bootstrap air refrigeration system
D) Reduced ambient air refrigeration system

... Answer is C) Bootstrap air refrigeration system
 

5.The COP of vapour compression refrigeration system is_______ as compared to air refrigeration and absorption refrigeration.

A) Lower
B) Higher
C) Equal
D) none of above

... Answer is B)
Higher
 

6. During a refrigeration process or cycle ,heat is rejected by the refrigerant in a_______

A) Compressor
B) Condenser
C) Evaporater
D) Expansion device

... Answer is B)
Condenser

7. Main components of vapour compression refrigerator are

A) Generator, condenser, expansion valve ,absorber,pump
B) compressor, Condenser, expansion valve,pump, evaporater
C) compressor, condenser, expansion valve, evaporater
D) all of the above

... Answer is C)
compressor, condenser, expansion valve, evaporater
 

8. In vapour compression refrigeration,the condition of refrigerant after compression

A) high pressure,high temperature vapour refrigerant
B) high pressure, low temperature liquid refrigerant
C) low pressure, low temperature liquid refrigerant
D) low pressure,low temperature vapour refrigerant

... Answer is A)
high pressure, high temperature vapour refrigerant
 

9. In vapour compression refrigeration,the condition of refrigerant after expansion valve...

A) high pressure, high temperature vapour refrigerant
B) high pressure, high temperature liquid refrigerant
C) low pressure, low temperature liquid refrigerant
D) low pressure, low temperature vapour refrigerant

... Answer is C) low pressure,low temperature liquid refrigerant

 

10. In vapour compression refrigeration, sub-cooling is used...

A) Before compression
B) After compression
C) Before throttling
D) After throttling

... Answer is C) Before throttling

 

11. The effect of increasing condenser temperature at fixed evaporater temperature in VCR system is/are

A) increase in power consumption of compressor
B) decrease in refrigeration capacity of plant
C) decrease in volumetric efficiency of compressor
D) all the above

... Answer is D)
all of the above
 

12. A two stage compressor with intercooling gives....

A) Higher COP
B) Lower COP
C) Equal COP
D) none of the above

... Answer is A) Higher COP

13. The effect of inter stage cooling in VCR system is/are...

A) Decrease in power consumption of higher stage compressor
B) decrease in volume of vapour refrigerant handled by higher stage compressor
C) decrease in stroke volume of higher stage compressor
D) all of the above

... Answer is D) all of the above

 

14. In two stage compression with flash intercooler, theoretically the condition of refrigerant at suction of higher stage compression is.....

A) Dry saturated vapour
B) Saturated liquid
C) Mixture of vapour and liquid
D) none of the above

... Answer is A)
Dry saturated vapour