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Heat Transfer

Heat Transfer
In SI units, fouling factor is expressed in

m²°K/W
W/m²°K
m°K/W
m²°K

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Heat Transfer
The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by

Roughening the surface
Painting the surface white (with aluminium paint)
Giving the surface a mirror finish
Painting the surface black

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Heat Transfer
Heat flux, as defined in heat flow is analogous to __________ in electricity flow.

None of these
Current
Resistance
Voltage

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Heat Transfer
In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass __________ through the heat exchanger.

Four times
Twice
Thrice
Once

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

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

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Heat Transfer
Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer.

Reynolds
Prandtl & Grashoff
Both A & B
Grashoff

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