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Heat and Mass Transfer

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

K cal m/hr m² °C
K cal/hr m² °C
K calm/hr °C
K cal/kg m² °C

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

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

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Heat and Mass Transfer
The heat transfer from a hot body to a cold body is directly proportional to the surface area and difference of temperatures between the two bodies. This statement is called

Newton's law of cooling
Stefan's law
Newton's law of heating
First law of thermodynamics

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Heat and Mass Transfer
Heat flows from one body to other when they have

Different temperatures
Different specific heat
Different atomic structure
Different heat contents

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Heat and Mass Transfer
LMTD in case of counter flow heat exchanger as compared to parallel flow heat exchanger is

Same
Depends on the area of heat exchanger
Higher
Lower

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

Black radiation
Total radiation
All of these
Full radiation

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