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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Carbon dioxide is

Colourless
All of the listed here
Odourless
Non-flammable

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Refrigeration and Air Conditioning
A refrigerant with the highest critical pressure is

R-12
R-11
R-22
Ammonia

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Refrigeration and Air Conditioning
Highest pressure encountered in a refrigeration system should be

Much above critical pressure
Critical pressure of refrigerant
Much below critical pressure
Near critical pressure

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Refrigeration and Air Conditioning
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

125 kJ/kg
100 kJ/kg
25 kJ/kg
50 kJ/kg

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Refrigeration and Air Conditioning
Ammonia is

Non-inflammable
Highly toxic and inflammable
Toxic and non-inflammable
Non-toxic

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Refrigeration and Air Conditioning
The vapour compression refrigerator employs the following cycle

Reversed Carnot
Reversed Rankine
Carnot
Rankine

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MORE MCQ ON Refrigeration and Air Conditioning

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