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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. The Carnot coefficient of performance of cycle will be

1.2
0.2
5
6

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Refrigeration and Air Conditioning
In Electrolux refrigerator

Ammonia is absorbed in water
Hydrogen evaporates in ammonia
Ammonia is absorbed in hydrogen
Ammonia evaporates in hydrogen

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Refrigeration and Air Conditioning
Pressure of water vapour is given by

None of these
μ/[1 - (1 - μ) (Ps/Pb)]
[Pv (Pb - Pd)]/ [Pd (Pb - Pv)]
0.622 Pv/ (Pb - Pv)

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Refrigeration and Air Conditioning
A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be

Lack of cooling water
All of these
Dirty condenser surface
Water temperature being high

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Refrigeration and Air Conditioning
Carbon dioxide is

Non-flammable
Colourless
All of the listed here
Odourless

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Refrigeration and Air Conditioning
The evolution of heat of solution takes place in ammonia absorption plant when

Ammonia vapour is driven out of solution
Lithium bromide mixes with ammonia
Ammonia vapour goes into solution
Weak solution mixes with strong solution

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