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Heat and Mass Transfer

Heat and Mass Transfer
Stefan Boltzmann law is applicable for heat transfer by

Conduction and radiation combined
Radiation
Conduction
Convection

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Heat and Mass Transfer
Upto the critical radius of insulation,

Heat flux will decrease
Added insulation will increase heat loss
Added insulation will decrease heat loss
Convective heat loss will be less than conductive heat loss

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

Peclet number
Nusselt number
Biot number
Stanton number

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Heat and Mass Transfer
The expression Q = ρ AT4 is called

Fourier equation
Stefan-Boltzmann equation
Joseph-Stefan equation
Newton Reichmann equation

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Heat and Mass Transfer
Which of the following has maximum value of thermal conductivity?

Aluminium
Steel
Brass
Copper

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

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

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