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Heat and Mass Transfer

Heat and Mass Transfer
According to Wien's law, the wavelength corresponding to maximum energy is proportion to

F
T
Absolute temperature (T)
I²

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Heat and Mass Transfer
40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is

0.4
0.75
0.55
0.45

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Heat and Mass Transfer
A non-dimensional number generally associated with natural convection heat transfer is

Grashoff number
Weber number
Prandtl number
Nusselt number

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Heat and Mass Transfer
Depending on the radiating properties, a body will be opaque when

P = 0, x = 1 and a = 0
X = 0, a + p = 1
P=1, x = 0 and a = 0
P = 0, x = 0 and a = 1

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Heat and Mass Transfer
If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of

9
270
81
3

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Heat and Mass Transfer
Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in

Boiler
Steam condenser
Refrigerator condenser coils
Electric heater

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