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Heat Transfer

Heat Transfer
Mechanical recompression evaporation is used in the production of

Fruits jam
Alcohol
Distilled water
Salt

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Heat Transfer
Thermal diffusivity of a material

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

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Heat Transfer
The critical radius 'r' of insulation on a pipe is given by

r = k/2h
r = k/h
r = 2k/h
r = h/k

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Heat Transfer
Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is

None of these
In the central core of the fluid
Uniformly distributed throughout the fluid
Mainly confined to a thin film of fluid near the surface

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Heat Transfer
In case of __________ boiling, the bubbles formed on a submerged hot surface get absorbed in the mass of the liquid.

Pool
None of these
Low pressure
Nucleate

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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.

Pool
Local
Nucleate
Saturated

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