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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The wet bulb temperature during sensible heating of air

Decreases
Increases
None of these
Remains constant

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Refrigeration and Air Conditioning
A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is

Ammonia
Carbon dioxide
Freon
Brine

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Refrigeration and Air Conditioning
The refrigerant supplied to a compressor must be

A mixture of liquid and vapour refrigerant
None of these
Superheated vapour refrigerant
Dry saturated liquid refrigerant

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Refrigeration and Air Conditioning
In vapour compression cycle using NH₃ as refrigerant, initial charge is filled at

Delivery of compressor
Low pressure side near receiver
High pressure side close to receiver
Suction of compressor

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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

e₁e₂
1/e₁ + 1/e₂
e₁ + e₂
(e₁ + e₂)/ e₁ + e₂ - e₁e₂

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Refrigeration and Air Conditioning
During cooling and dehumidification, dry bulb temperature

Decreases
Remains constant
Increases
None of these

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MORE MCQ ON Refrigeration and Air Conditioning

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