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Heat and Mass Transfer

Heat and Mass Transfer
The value of Prandtl number for air is about

0.1
0.7
0.3
1.7

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Heat and Mass Transfer
In heat exchangers, degree of approach is defined as the difference between temperatures of

Hot medium outlet and cold water outlet
Hot medium inlet and outlet
Hot medium outlet and cold water inlet
Cold water inlet and outlet

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

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Heat and Mass Transfer
The product of Reynolds number and Prandtl number is known as

Grashoff number
Stanton number
Biot number
Peclet number

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Heat and Mass Transfer
Emissivity of a white polished body in comparison to a black body is

Depends upon the shape of body
Lower
Higher
Same

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Heat and Mass Transfer
Total emissivity of polished silver compared to black body is

Same
Very much lower
More or less same
Higher

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