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Heat and Mass Transfer

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

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

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Heat and Mass Transfer
The heat transfer by conduction through a thick sphere is given by

Q = 2πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 8πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 6πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 4πkr1 r2 (T1 - T2)/ (r2 - r1)

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

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

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

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Heat and Mass Transfer
A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

U/Cmin
U.Cmin
Cmin/U
U/A.Cmin

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Heat and Mass Transfer
Stefan Boltzmann law is applicable for heat transfer by

Radiation
Conduction and radiation combined
Convection
Conduction

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