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Heat and Mass Transfer

Heat and Mass Transfer
An ordinary passenger aircraft requires a cooling system of capacity.

2 TR
10 TR
4 TR
8 TR

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Heat and Mass Transfer
In heat transfer, conductance equals conductivity (kcal/hr/sq.m/°C/cm) divided by

Sq. m (area)
Hr (time)
K.cal (heat)
°C (temperature)

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

All of these
Total radiation
Full radiation
Black radiation

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Heat and Mass Transfer
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Wien's law
Kirchhoff's law
Stefan's law
Planck's law

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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
Condensers and boilers in steam plants
All of these
Radiators in automobile

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Heat and Mass Transfer
The rate of energy transferred by convection to that by conduction is called

Peclet number
Biot number
Stanton number
Nusselt number

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