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Heat Transfer

Heat Transfer
Maximum heat transfer rate is achieved in __________ flow.

Laminar
Turbulent
Co-current
Counter-current

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Heat Transfer
One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to

Evaporate the water
To superheat the steam
Data insufficient, can
Heat the water from 0°C to 100°C

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Heat Transfer
The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body)

α T⁴
αT
Independent of T
α 1/T

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Heat Transfer
Steady state one dimensional heat flow by conduction as given by Fourier's low does not assume that

Material is anisotropic
There is no internal heat generation
Boundary surfaces are isothermal
Constant temperature gradient exists

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Heat Transfer
For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of

1
1.74
6.1
37

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Heat Transfer
Fruit juice (a heat sensitive material) can be concentrated in a __________ evaporator.

High pressure
Long tube
Falling film
None of these

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