A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

Refrigeration and Air Conditioning
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

125 kJ/kg

25 kJ/kg

100 kJ/kg

50 kJ/kg

125 kJ/kg

25 kJ/kg

100 kJ/kg

50 kJ/kg

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Refrigeration and Air Conditioning
An infinite parallel planes with emissivities e₁ and e₂, the interchange factor for radiation from surface 1 to surface 2 is given by

1/e₁ + 1/e₂

e₁e₂

e₁ + e₂

(e₁ + e₂)/ e₁ + e₂ - e₁e₂

1/e₁ + 1/e₂

e₁e₂

e₁ + e₂

(e₁ + e₂)/ e₁ + e₂ - e₁e₂

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Refrigeration and Air Conditioning
The relative coefficient of performance is equal to

None of these

(Actual C.O.P.) /(Theoretical C.O.P.)

(Theoretical C.O.P.)/ (Actual C.O.P.)

(Actual C.O.P.) × (Theoretical C.O.P.)

None of these

(Actual C.O.P.) /(Theoretical C.O.P.)

(Theoretical C.O.P.)/ (Actual C.O.P.)

(Actual C.O.P.) × (Theoretical C.O.P.)

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Refrigeration and Air Conditioning
In a refrigerating machine, heat rejected is _________ heat absorbed.

Greater than

None of these

Equal to

Less than

Greater than

None of these

Equal to

Less than

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Refrigeration and Air Conditioning
A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be

3 kW

4 kW

2 kW

1 kW

3 kW

4 kW

2 kW

1 kW

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Refrigeration and Air Conditioning
Dry bulb temperature is the temperature of air recorded by a thermometer, when

The moisture present in it begins to condense

Its bulb is surrounded by a wet cloth exposed to the air

It is not affected by the moisture present in the air

None of the listed here

The moisture present in it begins to condense

Its bulb is surrounded by a wet cloth exposed to the air

It is not affected by the moisture present in the air

None of the listed here

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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning An infinite parallel planes with emissivities e₁ and e₂, the interchange factor for radiation from surface 1 to surface 2 is given by

Refrigeration and Air Conditioning The relative coefficient of performance is equal to

Refrigeration and Air Conditioning In a refrigerating machine, heat rejected is _________ heat absorbed.

Refrigeration and Air Conditioning A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be

Refrigeration and Air Conditioning Dry bulb temperature is the temperature of air recorded by a thermometer, when

Refrigeration and Air Conditioning
An infinite parallel planes with emissivities e₁ and e₂, the interchange factor for radiation from surface 1 to surface 2 is given by

Refrigeration and Air Conditioning
The relative coefficient of performance is equal to

Refrigeration and Air Conditioning
In a refrigerating machine, heat rejected is _________ heat absorbed.

Refrigeration and Air Conditioning
A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be

Refrigeration and Air Conditioning
Dry bulb temperature is the temperature of air recorded by a thermometer, when