The critical thickness of insulation is the ratio of thermal conductivity of the

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Question
The critical thickness of insulation is the ratio of thermal conductivity of the insulating material (k) to the heat transfer coefficient at the outer surface of the insulation (h₀).
Options
A. True
B. False

Correct Answer

True

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Options
A. domestic refrigerators
B. water coolers
C. room air conditioners
D. all of these

Discuss

Correct Answer: domestic refrigerators

2. The process of heat transfer from a hot body to a cold body, in a straight line, without affecting the intervening medium, is called radiation.
Options
A. True
B. False

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Correct Answer: True

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A. True
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Correct Answer: True

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A. streamline flow
B. turbulent flow
C. steady flow
D. unsteady flow

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Correct Answer: unsteady flow

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Options
A. 10 to 40%
B. 40 to 60%
C. 60 to 70%
D. 70 to 90%

Discuss

Correct Answer: 70 to 90%

6. The angle included between the two lips projected upon a plane parallel to the drill axis and paralled to the two cutting lips, is called helix angle.
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A. Correct
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Correct Answer: Incorrect

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Options
A. Agree
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Correct Answer: Agree

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A. theoretical power
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Correct Answer: indicated power

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Options
A. dry bulb temperature
B. wet bulb temperature
C. dew point temperature
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Discuss

Correct Answer: dew point temperature

10. A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is
Options
A. 0.26
B. 0.36
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Discuss

Correct Answer: 0, 46

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The critical thickness of insulation is the ratio of thermal conductivity of the insulating material (k) to the heat transfer coefficient at the outer surface of the insulation (h0).

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The critical thickness of insulation is the ratio of thermal conductivity of the insulating material (k) to the heat transfer coefficient at the outer surface of the insulation (h₀).