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Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

Exercise : Heat Transfer, Refrigeration and Air Conditioning - Section 8
16.
A condenser is used in the __________ pressure side of a refrigerating system.
low
high
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,
the better insulation must be put inside
the better insulation must be put outside
one could place either insulation on either side
one should take into account the steam temperature before deciding as to which insulation is put where
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
In a parallel flow heat exchanger, the rate of flow of heat and the rate of decrease of temperature are maximum.
Yes
No
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
When the air is passed through an insulated chamber having sprays of water maintained at a temperature higher than the dew point temperature of entering air but lower than its dry bulb temperature, then the air is said to be
cooled and humidified
cooled and dehumidified
heated and humidified
heated and dehumidified
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
Which of the following statement is wrong?
The performance of the vapour compression refrigerator varies considerably with both vaporising and condensing temperatures.
In vapour compression cycle, the useful part of the heat transfer is at the condenser.
In ammonia-hydrogen (electolux) refrigerator, no compressor, pump or fan is required.
The effect of under-cooling the liquid refrigerant is to decrease the coefficient of performance.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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