Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

1. 

R-12 is generally preferred over R-22 in deep freezers since

A. it has low operating pressures
B. it gives higher coefficient of performance
C. it is miscible with oil over large range of temperatures
D. all of the above

Answer: Option C

Explanation:

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2. 

The temperature of air recorded by a thermometer, when its bulb is surrounded by a wet cloth exposed to the air, is called

A. wet bulb temperature
B. dry bulb temperature
C. dew point temperature
D. none of these

Answer: Option A

Explanation:

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3. 

During sub-cooling, sensible heat from a liquid refrigerant is removed.

A. Yes
B. No

Answer: Option A

Explanation:

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4. 

The expression is used for calculating relative humidity.

A. Yes
B. No

Answer: Option B

Explanation:

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5. 

If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called

A. absorptive power
B. emissive power
C. emissivity
D. none of these

Answer: Option B

Explanation:

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