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Heat and Mass Transfer

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

3
9
81
270

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Heat and Mass Transfer
Which of the following has least value of conductivity?

Plastic
Water
Air
Glass

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Heat and Mass Transfer
Cork is a good insulator because it has

Porous body
Free electrons
Low density
Atoms colliding frequency

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Heat and Mass Transfer
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as

Conduction
Radiation
Free convection
Forced convection

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Heat and Mass Transfer
Which of the following is a case of steady state heat transfer?

Air preheaters
I.C. engine
Heating of building in winter
None of these

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

Full radiation
All of these
Total radiation
Black radiation

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