Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

1. 

The centrifugal compressors are generally used for refrigerants that require

A. small displacements and low condensing pressures
B. large displacements and high condensing pressures
C. small displacements and high condensing pressures
D. large displacements and low condensing pressures

Answer: Option D

Explanation:

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2. 

The water, alcohol and ammonia have same refrigerating effect at different altitudes.

A. Yes
B. No

Answer: Option B

Explanation:

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3. 

The automobile radiator is a heat exchanger of

A. parallel flow type
B. counter flow type
C. cross flow type
D. regenerator type

Answer: Option C

Explanation:

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4. 

In mechanical refrigeration system, the refrigerant occurs as liquid between condenser and expansion valve.

A. True
B. False

Answer: Option A

Explanation:

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5. 

A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be

A. 1 kW
B. 2 kW
C. 3 kW
D. 4 kW

Answer: Option D

Explanation:

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