Short horizontal lines on pressure-enthalpy chart show

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

Constant pressure lines

Constant entropy lines

Constant total heat lines

Constant temperature lines

Constant pressure lines

Constant entropy lines

Constant total heat lines

Constant temperature lines

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Refrigeration and Air Conditioning
The power per tonne of refrigeration is

None of these

O.P/3.5

3.5/C.O.P.

3.5 × C.O.P.

None of these

O.P/3.5

3.5/C.O.P.

3.5 × C.O.P.

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Refrigeration and Air Conditioning
The freezing point of R-12 is

-86.6°C

-95.2°C

-135.8°C

-107.7°C

-86.6°C

-95.2°C

-135.8°C

-107.7°C

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Refrigeration and Air Conditioning
A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called

High side float valve

Thermostatic expansion valve

Low side float valve

Automatic expansion valve

High side float valve

Thermostatic expansion valve

Low side float valve

Automatic expansion valve

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Refrigeration and Air Conditioning
The relative humidity is defined as

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 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 kg of dry air

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 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 kg of dry air

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

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Refrigeration and Air Conditioning
The central air conditioning system has ___________ overall efficiency as compared to individual systems.

Same

Higher

Lower

None of these

Same

Higher

Lower

None of these

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Refrigeration and Air Conditioning

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

Refrigeration and Air Conditioning The power per tonne of refrigeration is

Refrigeration and Air Conditioning The freezing point of R-12 is

Refrigeration and Air Conditioning A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called

Refrigeration and Air Conditioning The relative humidity is defined as

Refrigeration and Air Conditioning The central air conditioning system has ___________ overall efficiency as compared to individual systems.

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

Refrigeration and Air Conditioning
The power per tonne of refrigeration is

Refrigeration and Air Conditioning
The freezing point of R-12 is

Refrigeration and Air Conditioning
A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called

Refrigeration and Air Conditioning
The relative humidity is defined as

Refrigeration and Air Conditioning
The central air conditioning system has ___________ overall efficiency as compared to individual systems.