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

Lowering the higher temperature
Operating the machine at higher speeds
Operating the machine at lower speeds
Raising the higher temperature

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Refrigeration and Air Conditioning
The relative humidity is defined as

The mass of water vapour present in 1 m3 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 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

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Refrigeration and Air Conditioning
In a saturated air-water vapour mixture, the

Dew point temperature is lower than wet bulb temperature
Dry bulb temperature is higher than wet bulb temperature
Dry bulb temperature is higher than dew point temperature
Dry bulb, wet bulb and dew point temperature are same

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Refrigeration and Air Conditioning
The reciprocating refrigerant compressors are very suitable for

Small displacements and high condensing pressures
Small displacements and low condensing pressures
Large displacements and low condensing pressures
Large displacements and high condensing pressures

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Refrigeration and Air Conditioning
A one tonne refrigerating machine means that

One tonne of water can be converted into ice
One tonne is the total mass of machine
One tonne refrigerant is used
One tonne of ice when melts from and at 0° C in 24 hours, the refrigeration effect is equivalent to 210 kJ/min

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