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Heat Transfer

Heat Transfer
1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C.

1
None of these
1.49
4.88

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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

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

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Heat Transfer
The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is

Either more or less ; depends on the nature of vapor
Less
Some
More

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Heat Transfer
__________ paint has the minimum absorption co-efficient.

Grey
Light cream
White lead
Black

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Heat Transfer
In a forward feed multiple effect, the pressure build up will be

least at the inlet of the first effect
least at the outlet of the last effect
highest at the outlet of the last effect
highest at the inlet of the last effect

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Heat Transfer
__________ chart is known as transient heat conduction chart.

Mollier's
Cox
Heisler's
Dirhing's

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MORE MCQ ON Heat Transfer

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