A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m².°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be

Heat Transfer
A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m².°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be

Greater than that for uninsulated steam pipe

Less than the steam pipe with 5 cms insulation

Equal to that of the uninsulated steam pipe

Less than that of the uninsulated steam pipe

Greater than that for uninsulated steam pipe

Less than the steam pipe with 5 cms insulation

Equal to that of the uninsulated steam pipe

Less than that of the uninsulated steam pipe

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Heat Transfer
Radiation heat transfer rates does not depend upon the

distance between the heat source and the object receiving the heat

none of the listed here

type of absorbing surface

surface area and temperature of the heat source

distance between the heat source and the object receiving the heat

none of the listed here

type of absorbing surface

surface area and temperature of the heat source

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Heat Transfer
For what value of Prandtl number, the Col-burn analogy is valid ?

0.06 to 120

0.6 to 120

l to 50

1 to 103

0.06 to 120

0.6 to 120

l to 50

1 to 103

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Heat Transfer
Nusselt number is the ratio of the temperature gradient at the wall to

Heat flux

None of these

That across the entire pipe

Temperature difference

Heat flux

None of these

That across the entire pipe

Temperature difference

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Heat Transfer
One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to

Heat the water from 0°C to 100°C

Data insufficient, can

Evaporate the water

To superheat the steam

Heat the water from 0°C to 100°C

Data insufficient, can

Evaporate the water

To superheat the steam

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Heat Transfer
A dephlegmator is a

Vacuum evaporator

Total condenser

Partial condenser

Double pipe heat exchanger

Vacuum evaporator

Total condenser

Partial condenser

Double pipe heat exchanger

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Heat Transfer

Heat Transfer Radiation heat transfer rates does not depend upon the

Heat Transfer For what value of Prandtl number, the Col-burn analogy is valid ?

Heat Transfer Nusselt number is the ratio of the temperature gradient at the wall to

Heat Transfer One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to

Heat Transfer A dephlegmator is a

Heat Transfer
Radiation heat transfer rates does not depend upon the

Heat Transfer
For what value of Prandtl number, the Col-burn analogy is valid ?

Heat Transfer
Nusselt number is the ratio of the temperature gradient at the wall to

Heat Transfer
One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to

Heat Transfer
A dephlegmator is a