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HEAT AND MASS TRANSFER

Heat and Mass Transfer
Unit of thermal diffusivity is

m²/hr °C
kcal/m² hr
m²/hr
kcal/m. hr °C

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Heat and Mass Transfer
Temperature of steam at around 540°C can be measured by

Thermometer
None of these
Thermistor
Thermocouple

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Heat and Mass Transfer
The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law.

Inversely proportional to
Directly proportional to
None of these
Equal to

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Heat and Mass Transfer
The use of heat exchangers is made in

Condensers and evaporators in refrigeration and air conditioning units
All of these
Condensers and boilers in steam plants
Radiators in automobile

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

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