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Heat and Mass Transfer

Heat and Mass Transfer
The radiation emitted by a black body is known as

Total radiation
Black radiation
Full radiation
All of these

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Heat and Mass Transfer
Planck’s law holds good for

black bodies
All of these
all coloured bodies
polished bodies

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Heat and Mass Transfer
Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.

Minimum energy
None of these
Both (A) and (B)
Maximum energy

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Heat and Mass Transfer
The automobile radiator is a heat exchanger of

Regenerator type
Counter flow type
Parallel flow type
Cross flow type

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Heat and Mass Transfer
In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

Reynold's number
Reynold's number, Grashoff's number
Grashoff's number
Prandtl number, Grashoff's number

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Heat and Mass Transfer
According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a

Black body
Brilliant white polished body
Red hot body
Grey body

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