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Heat and Mass Transfer

Heat and Mass Transfer
An ordinary passenger aircraft requires a cooling system of capacity.

8 TR
4 TR
10 TR
2 TR

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Heat and Mass Transfer
Absorptivity of a body will be equal to its emissivity

At all temperatures
When system is under thermal equilibrium
At one particular temperature
At critical temperature

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Heat and Mass Transfer
Thermal conductivity of water in general with rise in temperature

May increase or decrease depending on temperature
Increases
Remain constant
Decreases

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Heat and Mass Transfer
According to Stefan's law, the total radiation from a black body per second per unit area is proportional to

T2
Absolute temperature
T5
T

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Heat and Mass Transfer
The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called

Convection
Conduction
None of these
Radiation

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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

25 mm
800 mm
160 mm
40 mm

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