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Heat and Mass Transfer

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

Grashoff number
Biot number
Stanton number
Peclet number

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Heat and Mass Transfer
Depending on the radiating properties, a body will be opaque when

X = 0, a + p = 1
P = 0, x = 0 and a = 1
P=1, x = 0 and a = 0
P = 0, x = 1 and a = 0

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Heat and Mass Transfer
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

Directly proportional to the difference of temperatures between the two bodies
Directly proportional to the surface area
Both (A) and (B)
Either (A) or (B)

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Heat and Mass Transfer
The ratio of the energy absorbed by the body to total energy falling on it is called

Emissive power
Emissivity
Absorptive power
Absorptivity

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Heat and Mass Transfer
If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of

81
9
3
270

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Heat and Mass Transfer
Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in

Electric heater
Steam condenser
Boiler
Refrigerator condenser coils

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MORE MCQ ON Heat and Mass Transfer

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