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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The thermostatic expansion valve is used in ________ type of evaporators.

Dry
None of these
DX coil
Flooded

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Refrigeration and Air Conditioning
Which of the following refrigerants has lowest freezing point?

CO2
NH3
Freon-12
Freon-22

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Refrigeration and Air Conditioning
During a refrigeration cycle, heat is rejected by the refrigerant in a

Evaporator
Compressor
Expansion valve
Condenser

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Refrigeration and Air Conditioning
The wet bulb temperature at 100% relative humidity is___ dry bulb temperature.

Same as
None of the listed here
Higher than
Lower than

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Refrigeration and Air Conditioning
Pressure of water vapour is given by

0.622 Pv/ (Pb - Pv)
[Pv (Pb - Pd)]/ [Pd (Pb - Pv)]
μ/[1 - (1 - μ) (Ps/Pb)]
None of these

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Refrigeration and Air Conditioning
The leakage in a refrigeration system using ammonia is detected by

Halide torch
Sulphur sticks
Soap and water
All of these

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