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HEAT TRANSFER

Heat Transfer
Heat sensitive materials can be concentrated in an evaporator employing

None of these
Vacuum
High residence time
High pressure

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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
In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is __________ the outlet temperature of the cold fluid.

Less than
Equal to
Either more or less than (depending upon the fluid)
More than

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Heat Transfer
A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when

KA < 0.5kB
CPA < CPB
KA>2 kB
CPA > CPB

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Heat Transfer
In which mode of heat transfer, the Biot number is important?

Forced convection
Natural convection
Radiation
Transient heat conduction

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