Related Questions

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
A vapour absorption refrigeration system
A Gives noisy operation
B Gives quiet operation
C Requires little power consumption
D Cools below 0°C
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
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 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
The condition of refrigerant as it leaves the compressor in a vapour compression system is
A Saturated liquid
B Wet vapour
C Dry saturated vapour
D Superheated vapour
For a two stage compressor, if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will
A Increase
B Decrease
C Remain unaffected
D Other factors control it
Vapour compression refrigeration is somewhat like
A [

A. Carnot cycle

B Reversed Carnot cycle
C None of the above

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