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Heat and Mass Transfer

Heat and Mass Transfer
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

0.01
0.1
0.02
0.002

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Heat and Mass Transfer
The critical temperature is the temperature

Below which a gas does not obey gas laws
Above which a gas may explode
Above which a gas will never liquefied
Below which a gas is always liquefied

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Heat and Mass Transfer
Unit of thermal diffusivity is

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

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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 critical radius is the insulation radius at which the resistance to heat flow is

Zero
None of these
Minimum
Maximum

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Heat and Mass Transfer
The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

Equal to one
Equal to Nusselt number
Less than one
Greater than one

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MORE MCQ ON Heat and Mass Transfer

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