Category: Refrigeration and Air Conditioning

A. lower than atmospheric pressure
B. higher than atmospheric pressure
C. equal to atmospheric pressure
D. could be anything
E. none of the above

A. Co2
B. Freon-11
C. Freon-22
D. Air
E. none of the above

A. liquid
B. sub-cooled liquid
C. saturated liquid
D. wet vapour
E. dry vapour

A. condenser tubes
B. evaporator tubes
C. refrigerant cooling tubes
D. capillary tubes
E. throttling device

A. after passing through the condenser
B. before passing through the condenser
C. after passing through the expansion or throttle valve
D. before entering the expansion valve
E. before entering the compressor

A. condenser
B. evaporator
C. compressor
D. expansion valve
E. receiver

A. A refrigerant should have low latent heat
B. If operating temperature of system is low, then refrigerant with low boiling point should be used
C. Precooling and subcooling bf refrigerant are same
D. Superheat and sensible heat of a. refrigerant are same
E. Refrigerant is inside the lubes in case of a direct-expansion chiller

A. heat of compression
B. work done by compressor
C. enthalpy increase in compressor
D. all of the above
E. none of the above

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
E. at which all the three phases exist together

A. condenser and expansion valve
B. compressor and evaporator
C. expansion valve and evaporator
D. compressor and condenser
E. none of the above