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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The domestic refrigerator uses following type of compressor

Miniature sealed unit
Centrifugal
Piston type reciprocating
Axial

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Refrigeration and Air Conditioning
The thermostatic expansion valve operates on the changes in the

Pressure in the evaporator
Temperature of the evaporator
Degree of superheat at exit from the evaporator
None of these

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

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

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Refrigeration and Air Conditioning
In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to

Detect liquid in vapour
Collect vapours
Superheat the vapour
Collect liquid refrigerant and prevent it from going to compressor

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Refrigeration and Air Conditioning
For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference (tm) for parallel flow is ________ that for counter flow.

Equal to
None of these
Greater than
Less than

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Refrigeration and Air Conditioning
The lowest thermal diffusivity is of

Rubber
Aluminium
Iron
Lead

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