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Heat and Mass Transfer

Heat and Mass Transfer
Planck’s law holds good for

polished bodies
All of these
all coloured bodies
black bodies

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Heat and Mass Transfer
The emissive power of a body depends upon its

Temperature
Physical nature
All of these
Wave length

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Heat and Mass Transfer
Upto the critical radius of insulation,

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

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Heat and Mass Transfer
When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by

Conduction and convection
Radiation
Conduction
Convection

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Heat and Mass Transfer
A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is

20°C
60°C
66.7°C
40°C

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Heat and Mass Transfer
The natural convection air cooled condensers are used in

Water coolers
All of these
Room air conditioners
Domestic refrigerators

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MORE MCQ ON Heat and Mass Transfer

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