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Heat and Mass Transfer

Heat and Mass Transfer
Unit of thermal conductivity in S.I. units is

Option (B) and (C) above
J/m² sec
W/m °K
J/m °K sec

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Heat and Mass Transfer
In heat transfer, conductance equals conductivity (kcal/hr/sq.m/°C/cm) divided by

K.cal (heat)
Hr (time)
Sq. m (area)
°C (temperature)

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Heat and Mass Transfer
Heat transfer by radiation mainly depends upon

Kind and extent of its surface
Its temperature
Nature of the body
All of these

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Heat and Mass Transfer
The most commonly used method for the design of duct size is the

Dual or double method
Static regains method
Velocity reduction method
Equal friction method

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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)

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

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

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

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