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Heat and Mass Transfer

Heat and Mass Transfer
The emissivity for a black body is

1
0.75
0.5

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Heat and Mass Transfer
Thermal conductivity of air with rise in temperature

Increases
Remain constant
Decreases
May increase or decrease depending on temperature

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Heat and Mass Transfer
Thermal conductivity of solid metals with rise in temperature normally

Increases
Remain constant
Decreases
May increase or decrease depending on temperature

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Heat and Mass Transfer
The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Affect the intervening medium
Do not move actually
Move actually
Does not affect the intervening medium

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Heat and Mass Transfer
The amount of radiation mainly depends on

Type of surface of body
All of these
Temperature of body
Nature of body

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Heat and Mass Transfer
The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit

Temperature
Area
Thickness
Time

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