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)

50 kJ/kg

125 kJ/kg

100 kJ/kg

25 kJ/kg

50 kJ/kg

125 kJ/kg

100 kJ/kg

25 kJ/kg

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Refrigeration and Air Conditioning
The emissivity of a polished silver body is ____ as compared to black body.

High

Low

Same

Very low

High

Low

Same

Very low

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Refrigeration and Air Conditioning
Formation of frost on evaporator in refrigerator

Is immaterial

Increases heat transfer rate

Results in loss of heat due to poor heat transfer

Can be avoided by proper design

Is immaterial

Increases heat transfer rate

Results in loss of heat due to poor heat transfer

Can be avoided by proper design

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Refrigeration and Air Conditioning
The lowest thermal diffusivity is of

Lead

Aluminium

Iron

Rubber

Lead

Aluminium

Iron

Rubber

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Refrigeration and Air Conditioning
Under cooling in a refrigeration cycle

Other factors decide C.O.P

O.P remains unaltered

Increases C.O.P

Decreases C.O.P

Other factors decide C.O.P

O.P remains unaltered

Increases C.O.P

Decreases C.O.P

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Refrigeration and Air Conditioning
In order to collect liquid refrigerant and to prevent it from going to a ________, a device known as accumulator is used at the suction of compressor.

Evaporator

Expansion valve

Condenser

Compressor

Evaporator

Expansion valve

Condenser

Compressor

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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning The emissivity of a polished silver body is ____ as compared to black body.

Refrigeration and Air Conditioning Formation of frost on evaporator in refrigerator

Refrigeration and Air Conditioning The lowest thermal diffusivity is of

Refrigeration and Air Conditioning Under cooling in a refrigeration cycle

Refrigeration and Air Conditioning In order to collect liquid refrigerant and to prevent it from going to a ________, a device known as accumulator is used at the suction of compressor.

Refrigeration and Air Conditioning
The emissivity of a polished silver body is ____ as compared to black body.

Refrigeration and Air Conditioning
Formation of frost on evaporator in refrigerator

Refrigeration and Air Conditioning
The lowest thermal diffusivity is of

Refrigeration and Air Conditioning
Under cooling in a refrigeration cycle

Refrigeration and Air Conditioning
In order to collect liquid refrigerant and to prevent it from going to a ________, a device known as accumulator is used at the suction of compressor.