The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m².K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

Heat Transfer
The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m².K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

894W/m².K

287 W/m².K

1200W/m².K

333W/m².K

894W/m².K

287 W/m².K

1200W/m².K

333W/m².K

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Heat Transfer
Boiling point of a solution according to Duhring's rule is a linear function of the __________ of water.

Boiling point (at the same pressure)

Density

Thermal conductivity

Viscosity

Boiling point (at the same pressure)

Density

Thermal conductivity

Viscosity

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Heat Transfer
The thermal boundary layer at NPr > 1

Is thinner than hydrodynamic boundary layer

And the hydrodynamic boundary layer are identical

Disappears

Is thicker than hydrodynamic boundary layer

Is thinner than hydrodynamic boundary layer

And the hydrodynamic boundary layer are identical

Disappears

Is thicker than hydrodynamic boundary layer

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Heat Transfer
Rate of heat transfer by vaporisation from pools of water is affected by the

Surface tension of water

Nature of heating surface and distribution of bubbles

All of these

Viscosity of water

Surface tension of water

Nature of heating surface and distribution of bubbles

All of these

Viscosity of water

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Heat Transfer
All analogy equations connecting friction factor and heat transfer co-efficient apply only to

Wall or skin friction

Form friction

Both A and B

Turbulent flow

Wall or skin friction

Form friction

Both A and B

Turbulent flow

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Heat Transfer
In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred

None of these

Through a metallic wall

By heating an intermediate material (like chequor bricks) and then heating the air from this hot material

By direct contact of hot flue gas with air

None of these

Through a metallic wall

By heating an intermediate material (like chequor bricks) and then heating the air from this hot material

By direct contact of hot flue gas with air

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Heat Transfer

Heat Transfer The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m².K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

Heat Transfer Boiling point of a solution according to Duhring's rule is a linear function of the __________ of water.

Heat Transfer The thermal boundary layer at NPr > 1

Heat Transfer Rate of heat transfer by vaporisation from pools of water is affected by the

Heat Transfer All analogy equations connecting friction factor and heat transfer co-efficient apply only to

Heat Transfer In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred

Heat Transfer
The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m².K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m².K. The overall heat transfer co-efficient at this time is

Heat Transfer
Boiling point of a solution according to Duhring's rule is a linear function of the __________ of water.

Heat Transfer
The thermal boundary layer at NPr > 1

Heat Transfer
Rate of heat transfer by vaporisation from pools of water is affected by the

Heat Transfer
All analogy equations connecting friction factor and heat transfer co-efficient apply only to

Heat Transfer
In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred