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

In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is_____________________?

A. Less than 2 kg
B. More than or equal to 3.65 kg
C. More than 10 kg
D. There is no such consideration

Critical pressure of a liquid is the pressure_________________?

A. Above which liquid will remain liquid
B. Above which liquid becomes gas
C. Above which liquid becomes vapour
D. Above which liquid becomes solid

The vapor pressure of refrigerant should be_________________?

A. Lower than atmospheric pressure
B. Higher than atmospheric pressure
C. Equal to atmospheric pressure
D. Could be anything

The higher temperature in vapour compression cycle occurs at____________________?

A. receiver
B. expansion valve
C. evaporator
D. condenser discharge

The bank of tubes at the back of domestic refrigerator are _________________?

A. Condenser tubes
B. Evaporator tubes
C. Refrigerant cooling tubes
D. Capillary tubes

Air refrigeration cycle is used in ____________________?

A. Domestic refrigerators
B. Commercial refrigerators
C. Air conditioning
D. Gas liquefaction

For better COP of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be____________________?

A. Small
B. High
C. Euqal
D. Anything

Air refrigeration operates on_____________________?

A. carnot cycle
B. reversed carnot cycle
C. rankine cycle
D. erricson cycle

Refrigeration in aeroplanes usually employs the following refrigerant___________________?

A. Co2
B. Freon-11
C. Freon-22
D. Air