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Refrigeration and Air Conditioning

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

Increases
None of these
Remains constant
Decreases

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Refrigeration and Air Conditioning
If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of -23°C, then the Carnot COP will be

1.2
5
6
0.2

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Refrigeration and Air Conditioning
Allowable pressure on high pressure side or ammonia absorption system is of the order of

56 bars
24 bars
Slightly above atmospheric pressure
Atmospheric pressure

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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

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

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Refrigeration and Air Conditioning
One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice

In 1 minute
In 12 hours
In 1 hour
In 24 hours

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

None of these
Flooded
Dry
DX coil

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