252) The critical thickness of insulation for a sphere is

k/h₀

2k/h₀

h₀/k

h₀/2k

Answer is:

2k/h₀

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

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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

255) Film coefficient is defined as the ratio of

thermal conductivity to the equivalent thickness of the film of fluid

temperature drop through the films of fluids to the thickness of film of fluids

thickness of film of fluid to the thermal conductivity

thickness of film of fluid to the temperature drop through the films of fluids

Answer is:

thermal conductivity to the equivalent thickness of the film of fluid

256) Planck's law holds good for all coloured bodies.

Right

Wrong

Answer is:

Right

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

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252) The critical thickness of insulation for a sphere is

2k/h0

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

Related Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

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

255) Film coefficient is defined as the ratio of

thermal conductivity to the equivalent thickness of the film of fluid

256) Planck's law holds good for all coloured bodies.

Right

Heat Transfer Refrigeration and Air Conditioning MCQ with Answers

2k/h₀