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Heat Transfer

Heat Transfer
While the total emissivity of a perfect black body is unity, the same for a real body is

0
>1
1
between 0 and 1

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Heat Transfer
Presence of a non-condensing gas in a condensing vapour

None of the listed here
increases the rate of condensation
is desirable to increase the film co-efficient
decreases thermal resistance

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

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

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Heat Transfer
In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface.

Saturated
Pool
Local
Nucleate

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Heat Transfer
In Joule's experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms⁻². Neglecting the heat capacity of agitator, the temperature of water (in °C) is

26.8
25
40.5
34.4

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Heat Transfer
Agitated film evaporator is suitable for concentrating __________ liquids.

Corrosive
Foaming
Very thin
Viscous

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