89) Which of the following refrigerant has the lowest freezing point?

R-11

R-12

R-22

Ammonia

Answer is:

R-22

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90) For a white body, absorptivity (? ) = 0, reflectivity (?) = 1 and transmittivity (?) = 0.

Correct

Incorrect

Answer is:

Correct

91) Which of the following refrigerant has the maximum ozone depletion potential in the stratophere?

Ammonia

Carbon dioxide

Sulphur dioxide

Flourine

Answer is:

Flourine

92) Which of the following statement is correct?

The constant enthalpy lines are also constant wet bulb temperature lines.

The wet bulb and dry bulb temperature are equal at saturation condition.

The wet bulb temperature is a measure of enthalpy of moist air.

all of the above

Answer is:

all of the above

93) According to Stefan's law, the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature.

Correct

Incorrect

Answer is:

Correct

Explanation:

According to Stefan's law, the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature. Stefan Boltzmann law is applicable for heat transfer by radiation.

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