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Heat and Mass Transfer

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

Counter flow type
Regenerator type
Cross flow type
Parallel flow type

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

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

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

Atoms colliding frequency
Porous body
Free electrons
Low density

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Heat and Mass Transfer
All radiations in a black body are

Absorbed
Refracted
Reflected
Transmitted

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Heat and Mass Transfer
If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called

Absorptive power
None of these
Emissivity
Emissive power

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Heat and Mass Transfer
The natural convection air cooled condensers are used in

Room air conditioners
Water coolers
Domestic refrigerators
All of these

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