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Heat Transfer

Heat Transfer
A __________ evaporator employs an annular downtake.

None of these
Basket type
Horizontal
Long tube vertical

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Heat Transfer
Prandtl and Reynold's analogies are identical for Prandtl number value of

5
1
0.5

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

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

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Heat Transfer
Thermal diffusivity of a material

Is the ratio of thermal conductivity to thermal capacity
Has the unit m² /sec
All of these
Is defined as K/ρ . Cp

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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)
Painting the surface black
Giving the surface a mirror finish

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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.

Logarithmic
Either A, B or C
Arithmetic
Geometric

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MORE MCQ ON Heat Transfer

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