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

Equal to that of the uninsulated steam pipe

Less than that of the uninsulated steam pipe

Less than the steam pipe with 5 cms insulation

Greater than that for uninsulated steam pipe

Equal to that of the uninsulated steam pipe

Less than that of the uninsulated steam pipe

Less than the steam pipe with 5 cms insulation

Greater than that for uninsulated steam pipe

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Heat Transfer
In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is

Parabolic

Hyperbolic

Linear

None of these

Parabolic

Hyperbolic

Linear

None of these

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Heat Transfer
Heat sensitive materials can be concentrated in an evaporator employing

Vacuum

High residence time

None of these

High pressure

Vacuum

High residence time

None of these

High pressure

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Heat Transfer
For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it

Occupies smaller space

Is easy to operate and maintain

Is more economical

All of these

Occupies smaller space

Is easy to operate and maintain

Is more economical

All of these

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Heat Transfer
For an ideal black body

Absorptivity = 1

Reflectivity = 1

Emissivity = 0

Transmissivity = 1

Absorptivity = 1

Reflectivity = 1

Emissivity = 0

Transmissivity = 1

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Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Salty

Highly viscous

Corrosive

Scaling

Salty

Highly viscous

Corrosive

Scaling

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Heat Transfer

Heat Transfer In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is

Heat Transfer Heat sensitive materials can be concentrated in an evaporator employing

Heat Transfer For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it

Heat Transfer For an ideal black body

Heat Transfer Open pan evaporators are preferred to be used, when the solution to be concentrated is

Heat Transfer
In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is

Heat Transfer
Heat sensitive materials can be concentrated in an evaporator employing

Heat Transfer
For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it

Heat Transfer
For an ideal black body

Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is