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

A. First law of thermodynamics
B. Newton's law of cooling
C. Newton's law of heating
D. Stefan's law

Answer: Option B

Explanation:

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2. 

The pressure at the inlet of a refrigerant compressor is called

A. suction pressure
B. discharge pressure
C. critical pressure
D. back pressure

Answer: Option A

Explanation:

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3. 

The process, generally used in summer air conditioning to cool and dehumidify the air, is called

A. humidification
B. dehumidification
C. heating and humidification
D. cooling and dehumidification

Answer: Option D

Explanation:

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4. 

The leakage in a refrigeration system using ammonia is detected by

A. halide torch
B. sulphur sticks
C. soap and water
D. all of these

Answer: Option B

Explanation:

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5. 

The lowest temperature during the cycle in a vapour compression system occurs after

A. compression
B. expansion
C. condensation
D. evaporation

Answer: Option D

Explanation:

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