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Heat Transfer

Heat Transfer
Which of the following has the minimum absorptivity?

Refractory bricks
Coal dust
Aluminium foil
Iron plates

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

Grashoff
Reynolds
Prandtl & Grashoff
Both A & B

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Heat Transfer
The unit of conductance in SI unit is

W/m
W/°K
W/m°K
W/m²

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Heat Transfer
For a given ambient air temperature with increase in the thickness of insulation of a hot cylinderical pipe, the rate of heat loss from the surface would

Decrease
First decrease and then increase
Increase
First increase and then decrease

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Heat Transfer
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is

4.36
120.36
2.36
Dependent on NRe only

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Heat Transfer
Black liquor generated during paper manufacture is concentrated in a

single effect evaporator
single effect evaporator followed by a crystalliser
multiple effect evaporators followed by a crystalliser
multiple effect evaporator

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