Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

1.
The heat transfer from a hot body to a cold body is directly proportional to the surface area and difference of temperatures between the two bodies. This statement is called
First law of thermodynamics
Newton's law of cooling
Newton's law of heating
Stefan's law
Answer: Option
Explanation:
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2.
The pressure at the inlet of a refrigerant compressor is called
suction pressure
discharge pressure
critical pressure
back pressure
Answer: Option
Explanation:
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3.
The process, generally used in summer air conditioning to cool and dehumidify the air, is called
humidification
dehumidification
heating and humidification
cooling and dehumidification
Answer: Option
Explanation:
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4.
The leakage in a refrigeration system using ammonia is detected by
halide torch
sulphur sticks
soap and water
all of these
Answer: Option
Explanation:
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5.
The lowest temperature during the cycle in a vapour compression system occurs after
compression
expansion
condensation
evaporation
Answer: Option
Explanation:
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