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Heat Transfer

Heat Transfer
In SI units, thermal conductivity is expressed in

Watt/m². °K
Watt/m4. °K
Watt/m.°K
Watt/m². °K

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Heat Transfer
In pipe flow, heat is transferred from hot wall to the liquid by

Forced convection only
Conduction only
Free and forced convection
Forced convection and conduction

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Heat Transfer
In case of heat transfer by conduction in a hollow cylinder, __________ mean area is used to calculate the heat transfer rate.

Either A, B or C
Arithmetic
Geometric
Logarithmic

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Heat Transfer
The critical radius 'r' of insulation on a pipe is given by

r = k/2h
r = k/h
r = h/k
r = 2k/h

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Heat Transfer
Fouling factor for a heat exchanger is given by (where, U₁ = heat transfer co-efficient of dirty surface U₂ = heat transfer co-efficient of clean surface)

U₁ - U₂
1/U₂ - 1/U₁
U₂ - U₁
1/U₁ - 1/U₂

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Heat Transfer
The average heat transfer co-efficient over the entire length of the plate (ha) and the local heat transfer co-efficient (hL), in case of heat transfer over a flat plate in lminar zone is related as

Ha = 0.8hL
Ha = hL
Ha = 2hL
Ha= 5hL

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