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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Carbon dioxide is

Non-flammable
Odourless
Colourless
All of the listed here

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Refrigeration and Air Conditioning
Refrigeration in aeroplanes usually employs the following refrigerant

Air
Freon-11
Freon-22
CO2

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Refrigeration and Air Conditioning
Which of the following is not a desirable property of a refrigerant?

Good electrical conductor
High risibility with oil
Low boiling point
Large latent heat

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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

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

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Refrigeration and Air Conditioning
Accumulators should have adequate volume to store refrigerant charge at least

0.5
0.75
0.25
0.1

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Refrigeration and Air Conditioning
The lowest thermal diffusivity is of

Aluminium
Lead
Rubber
Iron

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MORE MCQ ON Refrigeration and Air Conditioning

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