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Heat and Mass Transfer

Heat and Mass Transfer
The highest thermal diffusivity is of

Lead
Iron
Concrete
Wood

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Heat and Mass Transfer
In a shell and tube heat exchanger, baffles are provided on the shell side to

Prevent stagnation of shell side fluid
All of these
Provide support for tubes
Improve heat transfer

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

Atoms colliding frequency
Porous body
Low density
Free electrons

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

Wave length
Temperature
Physical nature
All of these

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Heat and Mass Transfer
The thermal diffusivities for solids are generally

Less than those for gases
More or less same as for liquids and gases
More than those for liquids and gases
Less than those for liquids

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Heat and Mass Transfer
Moisture would find its way into insulation by vapour pressure unless it is prevented by

Less thermal conductivity insulator
High vapour pressure
A vapour seal
High thickness of insulation

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MORE MCQ ON Heat and Mass Transfer

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