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
(D) at which all the three phases exist together
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
(D) none of the above
The higher temperature in vapour compression cycle occurs at____________________?
(A) receiver
(B) expansion valve
(C) evaporator
(D) condenser discharge
(D) compressor 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
(D) throttling device
Air refrigeration cycle is used in ____________________?
(A) domestic refrigerators
(B) commercial refrigerators
(C) air conditioning
(D) gas liquefaction
(D) such a cycle does not exist
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
(D) under some conditions small and under some conditions high
Air refrigeration operates on_____________________?
(A) Carnot cycle
(B) Reversed Carnot cycle
(C) Rankine cycle
(D) Erricson cycle
(D) Brayton cycle
Refrigeration in aeroplanes usually employs the following refrigerant___________________?
(A) Co2
(B) Freon-11
(C) Freon-22
(D) Air
(D) none of the above
Rating of a domestic refrigerator is of the order of__________________?
(A) 0.1 ton
(B) 5 tons
(C) 10 tons
(D) 40 tons
(D) 100 tons
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
(D) 10