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Heat and Mass Transfer

Heat and Mass Transfer
In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in

Cross flow
Counter flow
Parallel flow
All of these

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Heat and Mass Transfer
Depending on the radiating properties, body will be transparent when(Where a = absorptivity, p = reflectivity, x = transmissivity)

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

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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
The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law.

None of these
Directly proportional to
Equal to
Inversely proportional to

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

Steam condenser
Electric heater
Refrigerator condenser coils
Boiler

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Heat and Mass Transfer
The amount of radiation mainly depends upon the

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

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