Related Questions

The ratio of heat extracted in the refrigerator to the work-done on the refrigerant is called
A Coefficient of performance of refrigeration
B Coefficient of performance of heat pump
C Relative coefficient of performance
D Refrigerating efficiency
The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of __________ and COP are the same.
A Kinematic viscosity
B Work
C Temperature
D None of these
The coefficient of performance of Electrolux refrigerator is the ratio of
A Heat supplied by the gas burner to the heat absorbed by the evaporator
B Heat absorbed by the evaporator to the heat supplied by the gas burner
C Heat supplied by the gas burner minus the heat absorbed by the evaporator to the heat supplied by the gas burner
D Heat absorbed by the evaporator minus the heat supplied by the gas burner to the heat absorbed by the evaporator
If C is creep coefficient, f is original pre-stress in concrete, m is modular ratio, E is Young's modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is:
A (1 - C) mf - eE
B (C - 1) mf + eE
C (C - 1) mf - eE
D (1 - C) mf + eE
which of the following refrigerant has the lowest freezing point?
A Freon -11
B Freon -12
C Freon -22
D Ammonia
The undesirable property of a refrigerant is
A Non-toxic
B Non-flammable
C Non-explosive
D High boiling point
The desirable property of a refrigerant is
A Low boiling point
B High critical temperature
C High latent heat of vaporisation
D All of these
A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be
A Lack of cooling water
B Water temperature being high
C Dirty condenser surface
D All of these
Refrigeration in aeroplanes usually employs the following refrigerant
A CO2
B Freon-11
C Freon-22
D Air
Absorption system normally uses the following refrigerant
A Freon-11
B Freon-22
C CO2
D Ammonia

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