Related Questions

In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in
A Enhanced COP
B Decreased COP
C No change in the value of COP
D Increased or decreased COP ; depending upon the type of refrigerant
The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will
A Increase
B Decrease
C May increase or decrease depending on the type of refrigerant used
D Remain unaffected
The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is
A Less pronounced
B More pronounced
C Equal
D Data insufficient, can't be predicted
In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by
A Liquid pump
B Generator
C Absorber and generator
D Absorber, generator and liquid pump
If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be
A Same
B More
C Less
D More/less depending on rating
The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P.
A More
B Less
C Equally
D Unpredictable
The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is
A Same
B More
C Less
D More or less depending on ambient conditions
In a vapour compression refrigeration system, a throttle valve is used in place of an expander because
A It considerably reduces mass of the system
B It improves the C.O.P., as the condenser is small
C The positive work in isentropic expansion of liquid is very small
D It leads to significant cost reduction
In vapour compression refrigeration system, refrigerant occurs as liquid between
A Condenser and expansion valve
B Compressor and evaporator
C Expansion valve and evaporator
D Compressor and condenser
Which of the following is a widely used refrigerant in vapour compression refrigeration system (using large centrifugal compressor)?
A Freon
B Liquid sulphur dioxide
C Methyl chloride
D Ammonia

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