Related Questions

Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in
A Increased COP
B Same COP
C Decreased COP
D Increased or decreased COP ; depending upon the type of refrigerant
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 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 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
A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?
A Vapor compression cycle using expansion valve
B Air refrigeration cycle
C Vapor compression cycle using expansion engine
D Carnot refrigeration cycle
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
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
A multiple effect evaporator as compared to a single effect evaporator of the same capacity has
A Lower heat transfer area
B Lower steam economy
C Higher steam economy
D Higher solute concentration in the product
Which of the following has the minimum value of COP for a given refrigeration effect?
A Reverse Carnot cycle
B Ordinary vapour-compression cycle
C Vapour-compression process with a reversible expansion engine
D Air refrigeration cycle

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