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Heat Transfer

Heat Transfer
The ratio of momentum diffusivity to thermal diffusivity is the __________ number.

Stanton
Nusselt
Grashoff
Prandtl

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Heat Transfer
The absorptivity of a grey body at a given temperature __________ with increasing wavelength of radiation.

Decreases
Increases
May increase or decrease ; depends on the material
Remains constant

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Heat Transfer
Nusselt number is a function of Prandtl number and __________ number of fluid in natural convection heat transfer.

Reynolds
Stantan
Grashoff
Biot

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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

25
34.4
26.8
40.5

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Heat Transfer
Increasing the liquor level in the evaporator results in the

increase in liquor film co-efficient
decreased effect of hydrostatic head
decreased capacity
increased true temperature drop

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Heat Transfer
Boiling point elevation of an ideal solution

Increases rapidly with temperature rise
Both B and C
Decreases rapidly with temperature rise
In independent of pressure

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