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Heat Transfer

Heat Transfer
Which of the following has the minimum absorptivity?

Refractory bricks
Aluminium foil
Coal dust
Iron plates

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Heat Transfer
For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is

Nu = 0.023 Re0.8 . Pr0.4
Nu = 2Gz0.5
Nu = Gz
Nu = Gz

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Heat Transfer
The unit of heat transfer co-efficient in SI unit is

J/M2°K
W/m2°K
J/m°K
W/m°K

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Heat Transfer
Kg of liquid evaporated per hour in an evaporator is defined as its

Capacity
Steam load
None of these
Economy

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Heat Transfer
The Grashoff number is defined as the ratio of the

buoyancy to inertial forces
buoyancy to surface tension forces
buoyancy to viscous forces
inertial to viscous forces.

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Heat Transfer
The purpose of providing expansion bellows in the shell of tubular exchanger is to

Increase the heating load
Facilitate increase of shell length, if needed
Impart structural strength
Account for the uneven expansion of shell and tube bundles

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