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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/m °K sec
J/m² sec
W/m °K

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

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 natural convection air cooled condensers are used in

Water coolers
All of these
Room air conditioners
Domestic refrigerators

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

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

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Heat and Mass Transfer
Which of the following is a case of steady state heat transfer?

Air preheaters
I.C. engine
None of these
Heating of building in winter

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Heat and Mass Transfer
A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

h₁ + h₂ + h₃
(h₁.h₂.h₃)1/3
None of these
1/h₁ + 1/h₂ + 1/h₃

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