Moisture should be removed from refrigerants to avoid

Refrigeration and Air Conditioning
Moisture should be removed from refrigerants to avoid

Restriction to refrigerant flow

All of these

Corrosion of steel plates

Freezing at the expansion valve

Restriction to refrigerant flow

All of these

Corrosion of steel plates

Freezing at the expansion valve

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Refrigeration and Air Conditioning
The relative coefficient of performance is equal to

(Actual C.O.P.) × (Theoretical C.O.P.)

(Actual C.O.P.) /(Theoretical C.O.P.)

None of these

(Theoretical C.O.P.)/ (Actual C.O.P.)

(Actual C.O.P.) × (Theoretical C.O.P.)

(Actual C.O.P.) /(Theoretical C.O.P.)

None of these

(Theoretical C.O.P.)/ (Actual C.O.P.)

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Refrigeration and Air Conditioning
Degree of saturation or percentage humidity is

The mass of water vapour present in 1 m³ of dry air

The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure

The mass of water vapour present in 1 kg of dry air

The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure

The mass of water vapour present in 1 m³ of dry air

The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure

The mass of water vapour present in 1 kg of dry air

The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure

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Refrigeration and Air Conditioning
When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by

Raising the higher temperature

Lowering the higher temperature

Operating the machine at lower speeds

Operating the machine at higher speeds

Raising the higher temperature

Lowering the higher temperature

Operating the machine at lower speeds

Operating the machine at higher speeds

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Refrigeration and Air Conditioning
If a gas is to be liquefied, its temperature must be

None of these

Reduced to a value below its critical temperature

Increased to a value above its critical temperature

Equal to critical temperature

None of these

Reduced to a value below its critical temperature

Increased to a value above its critical temperature

Equal to critical temperature

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Refrigeration and Air Conditioning
An Electrolux refrigerator is called a ___ absorption system.

Single fluid

Three fluids

Two fluids

None of the listed here

Single fluid

Three fluids

Two fluids

None of the listed here

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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning Moisture should be removed from refrigerants to avoid

Refrigeration and Air Conditioning The relative coefficient of performance is equal to

Refrigeration and Air Conditioning Degree of saturation or percentage humidity is

Refrigeration and Air Conditioning When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by

Refrigeration and Air Conditioning If a gas is to be liquefied, its temperature must be

Refrigeration and Air Conditioning An Electrolux refrigerator is called a ___ absorption system.

Refrigeration and Air Conditioning
Moisture should be removed from refrigerants to avoid

Refrigeration and Air Conditioning
The relative coefficient of performance is equal to

Refrigeration and Air Conditioning
Degree of saturation or percentage humidity is

Refrigeration and Air Conditioning
When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by

Refrigeration and Air Conditioning
If a gas is to be liquefied, its temperature must be

Refrigeration and Air Conditioning
An Electrolux refrigerator is called a ___ absorption system.