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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference (tm) for parallel flow is ________ that for counter flow.

Equal to
Greater than
None of these
Less than

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Refrigeration and Air Conditioning
The alignment circle is marked on the psychrometric chart at

20°C DBT and 50% RH
20°C DBT and 60% RH
26°C DBT and 60% RH
26°C DBT and 50% RH

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Refrigeration and Air Conditioning
The operating pressure for refrigerating units using R-12 as a refrigerant is

30 bar
2 bar
8 bar
15 bar

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

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

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Refrigeration and Air Conditioning
The colour of the flame of halide torch, in case of leakage of Freon refrigerant, will change to

Orange
Yellow
Red
Bright green

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Refrigeration and Air Conditioning
The reduced ambient air cooling system has

One cooling turbine and two heat exchangers
One cooling turbine and one heat exchanger
Two cooling turbines and one heat exchanger
Two cooling turbines and two heat exchangers

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