REFRIGERATION AND AIR CONDITIONING MCQ -: 05

Q.1 On high side of ammonia absorption system allowable pressure is of the order of ______ .

A. 1 - 2 bars

B. 5 - 6 bars

C. ATM pressure 

D. 10 bars

And -: B

Q.2 The ______ temperature is the temperature above which a gas will never liquefy .

A. Atmospheric temperature 

B. Dew point temperature 

C. Wet bulb temperature 

D. Critical temperature 

And-: D

Q.3 The refrigerant for a refrigerator should have _____ .

A. High latent heat 

B. High sensible heat 

C. Low latent heat

D. Low sensible heat

And-: A

Q.4 At which pressure above which a liquid will remain liquid 

A. Absolute pressure 

B. Critical pressure 

C. Atmospheric pressure 

D. Low pressure 

And -: B

Q.5  In a flooded evaporator refrigerator  , an accumulator at suction of compressor is used to ____.

A. Collect vapour 

B. Increase refrigeration effect 

C. Collect liquid refrigerant and prevent it from going to compressor. 

D. None of the above 

Ans -: C

Q.6 In vapour compression cycle the higher temperature occurs at _____ .

A. Evaporator 

B. Condenser discharge 

C. Compressor discharge 

D. Expansion system

Ans -: C

Q.7 In which type of refrigeration system aqua ammonia is used as a refrigerant?

A. Compression 

B. Absorption 

C. Indirect 

D. None of the above 

Ans -: B

Q.8 The flow of refrigerant is controlled by which device?

A. Evaporator 

B. Compressor 

C. Condenser 

D. Expansion valve 

And -: D

Q.9 what is the effect of supercharging in a refrigeration cycle?

A. Decrease COP

B. Increase COP

C. Higher efficiency 

D. More refrigeration effect 

Ans -: A

Q.10  which temperature indicate the amount of moisture in air ?

A. Dew point temperature 

B. Critical temperature 

C. Dry bulb temperature 

D. Wet bulb temperature 

And -: D

Q.11 Generally cooling towers are installed where __.

A. For very big plant

B. Water is scarce

C. Water is available in plenty 

D. All of the above 

Ans -: B

Q.12 The percentage loss of drift in cooling towers is ____ .

A. 1 to 5 %

B. 10 to 15 %

C. 10 to 20 %

D. 25 to 50 %

Ans -: C

Q.13 Water is cooled by _____ in cooling towers system.

A. Condensation 

B. Evaporation 

C. Fusion

D. Sublimation 

And-: B

Q.14 Pure humidification can be achieved by passing air through the spray water maintained at _________ .

A. Dry bulb temperature 

B. Wet bulb temperature 

C. Dew point temperature 

D. Atmospheric temperature 

And -: A

Q.15 As warm air cools , it's relative humidity ________.

A. Increase and then decrease 

B. Decrease 

C. Increase 

D. Decrease and then increase 

And -: C