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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be

2.33
1.33
4.33
3.33

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Refrigeration and Air Conditioning
In S.J. unit, one ton of refrigeration is equal to

210 kJ/ min
840 kJ/ min
420 kJ/ min
21 kJ/ min

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Refrigeration and Air Conditioning
R-12 is generally preferred over R-22 in deep freezers since

It gives higher coefficient of performance
It is miscible with oil over large range of temperatures
It has low operating pressures
All of these

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Refrigeration and Air Conditioning
Bell Coleman cycle is a

Reversed Otto cycle
Reversed Carnot cycle
Reversed Joule cycle
Reversed Rankine cycle

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Refrigeration and Air Conditioning
The superheated vapour region, in a pressure enthalpy chart, is represented by the space

To the right of saturated liquid line
To the left of saturated liquid line
None of these
Between the saturated liquid line and saturated vapour line

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Refrigeration and Air Conditioning
Chaperon equation is a relation between

Temperature, pressure and enthalpy
Temperature, pressure, specific volume and enthalpy
Specific volume and enthalpy
Temperature and enthalpy

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