Heat Transfer, Refrigeration and Air Conditioning - Section 1 (2)

Directions to Solve

Heat Transfer, Refrigeration and Air Conditioning - Section 1

9.

A refrigeration system

A.	removes heat from a low temperature body and delivers it to a high temperature body
B.	removes heat from a high temperature body and delivers it to a low temperature body
C.	rejects energy to a low temperature body
D.	none of the above

Answer: Option A

Explanation:

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10.

During a refrigeration cycle, heat is rejected by the refrigerant in a

A.	compressor
B.	condenser
C.	evaporator
D.	expansion valve

Answer: Option B

Explanation:

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11.

The coefficient of performance of Heat Pump is always __________ one.

A.	equal to
B.	less than
C.	greater than

Answer: Option C

Explanation:

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12.

Degree of saturation or percentage humidity is

A.	the mass of water vapour present in 1 m3 of dry air
B.	the mass of water vapour present in 1 kg of dry air
C.	the ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure.
D.	the ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure

Answer: Option C

Explanation:

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13.

A perfect black body is one which

A.	is black in colour
B.	absorbs heat radiations of all wave lengths falling on it
C.	reflects all the heat radiations
D.	transmits the heat radiations

Answer: Option B

Explanation:

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14.

The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

A.	equal to one
B.	greater than one
C.	less than one
D.	equal to Nusselt number

Answer: Option A

Explanation:

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15.

During adiabatic saturation process on unsaturated air __________ remains constant.

A.	relative humidity
B.	dew point temperature
C.	dry bulb temperature
D.	wet bulb temperature

Answer: Option D

Explanation:

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16.

Thermal conductivity of water __________ with rise in temperature.

A.	remains same
B.	decreases
C.	increases
D.	may increase or decrease depending upon temperature

Answer: Option D

Explanation:

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