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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The pressure at the inlet of a refrigerant compressor is called

Critical pressure
Back pressure
Discharge pressure
Suction pressure

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Refrigeration and Air Conditioning
Nusselt number (NN) is given by

NN = V²/t.cp
NN = hl/k
NN = ρ V l /μ
NN = μ cp/k

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Refrigeration and Air Conditioning
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

increases
depends on other factors
decreases
remains same

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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
21 kJ/ min
420 kJ/ min

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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
Freon
Carbon dioxide
Brine

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Refrigeration and Air Conditioning
The alignment circle is marked on the psychrometric chart at

26°C DBT and 50% RH
26°C DBT and 60% RH
20°C DBT and 60% RH
20°C DBT and 50% RH

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MORE MCQ ON Refrigeration and Air Conditioning

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