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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
For obtaining high COP, the pressure range of compressor should be

Any value
High
Low
Optimum

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Refrigeration and Air Conditioning
Critical temperature is the temperature above which

Water will evaporate
Water will never evaporate
A gas will never liquefy
A gas will immediately liquefy

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Refrigeration and Air Conditioning
The horizontal and non-uniformly spaced lines on a psychrometric chart indicates

Wet bulb temperature
Dry bulb temperature
Specific humidity
Dew point temperature

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Refrigeration and Air Conditioning
Short horizontal lines on pressure-enthalpy chart show

Constant total heat lines
Constant pressure lines
Constant entropy lines
Constant temperature lines

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

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

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Refrigeration and Air Conditioning
Where does the lowest temperature occur in a vapour compression cycle?

Evaporator
Condenser
Expansion valve
Compressor

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MORE MCQ ON Refrigeration and Air Conditioning

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