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Heat and Mass Transfer

Heat and Mass Transfer
Unit of thermal diffusivity is

m²/hr
kcal/m. hr °C
kcal/m² hr
m²/hr °C

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Heat and Mass Transfer
The rate of energy transferred by convection to that by conduction is called

Peclet number
Nusselt number
Stanton number
Biot number

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Heat and Mass Transfer
The emissive power of a body depends upon its

Physical nature
All of these
Wave length
Temperature

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Heat and Mass Transfer
In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger.

Less
None of these
Same
Greater

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Heat and Mass Transfer
An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m²). The critical thickness of insulation will be

160 mm
40 mm
25 mm
800 mm

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Heat and Mass Transfer
Unit of thermal conductivity in S.I. units is

W/m °K
Option (B) and (C) above
J/m °K sec
J/m² sec

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