250) Kirchhoff's law states that

the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature

the wave length corresponding to the maximum energy is proportional to the absolute temperature

the ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body

none of the above

Answer is:

the ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body

Explanation:

According to Kirchhoff's law, the ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body.

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

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251) Dew point temperature is the temperature of air recorded by a thermometer, when the moisture present in it begins to condense.

Correct

Incorrect

Answer is:

Correct

252) The critical thickness of insulation for a sphere is

k/h₀

2k/h₀

h₀/k

h₀/2k

Answer is:

2k/h₀

253) The difference between dry bulb temperature and dew point temperature, is called

dry bulb depression

wet bulb depression

dew point depression

degree of saturation

Answer is:

dew point depression

254) Logarithmic mean temperature difference is the same as the arithmetic mean temperature difference.

Agree

Disagree

Answer is:

Disagree

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

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250) Kirchhoff's law states that

the ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

Related Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

251) Dew point temperature is the temperature of air recorded by a thermometer, when the moisture present in it begins to condense.

Correct

252) The critical thickness of insulation for a sphere is

2k/h0

253) The difference between dry bulb temperature and dew point temperature, is called

dew point depression

254) Logarithmic mean temperature difference is the same as the arithmetic mean temperature difference.

Disagree

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

2k/h₀