The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m². The flux, when the element temperature is increased to 1000°C for the same furnace temperature is

Heat Transfer
The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m². The flux, when the element temperature is increased to 1000°C for the same furnace temperature is

14.6 kW/m²

12.0 kW/m²

11.2 kW/m²

16.5 kW/m²

14.6 kW/m²

12.0 kW/m²

11.2 kW/m²

16.5 kW/m²

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Heat Transfer
Fouling factor for a heat exchanger is given by (where, U₁ = heat transfer co-efficient of dirty surface U₂ = heat transfer co-efficient of clean surface)

1/U₁ - 1/U₂

U₂ - U₁

U₁ - U₂

1/U₂ - 1/U₁

1/U₁ - 1/U₂

U₂ - U₁

U₁ - U₂

1/U₂ - 1/U₁

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Heat Transfer
In case of a vertical tube evaporator, with increase in the liquor level, the __________ is increased.

Both A and B

Neither A and B

Velocity of circulation

Liquor-film co-efficient

Both A and B

Neither A and B

Velocity of circulation

Liquor-film co-efficient

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Heat Transfer
In a gas-liquid shell and tube heat exchanger, the

Presence of a non-condensible gas decreases the condensing film co-efficient

Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature

Gases to be heated/cooled is normally routed through the shell side, because the corrosion caused by the cooling water or steam condensate remain localised to the tubes

All of these

Presence of a non-condensible gas decreases the condensing film co-efficient

Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature

Gases to be heated/cooled is normally routed through the shell side, because the corrosion caused by the cooling water or steam condensate remain localised to the tubes

All of these

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Heat Transfer
Nusselt number is the ratio of the

Temperature gradient of the wall to that across the entire pipe

Heat flux at the wall to that across the entire pipe

Temperature difference to the temperature gradient at the wall

None of these

Temperature gradient of the wall to that across the entire pipe

Heat flux at the wall to that across the entire pipe

Temperature difference to the temperature gradient at the wall

None of these

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Heat Transfer
Which of the following is the most controlling factor for the rate of bubble detachment from the hot solid surface?

Liquid density

Hot surface temperature

Liquid viscosity

Interfacial tension

Liquid density

Hot surface temperature

Liquid viscosity

Interfacial tension

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Heat Transfer

Heat Transfer The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m². The flux, when the element temperature is increased to 1000°C for the same furnace temperature is

Heat Transfer Fouling factor for a heat exchanger is given by (where, U₁ = heat transfer co-efficient of dirty surface U₂ = heat transfer co-efficient of clean surface)

Heat Transfer In case of a vertical tube evaporator, with increase in the liquor level, the __________ is increased.

Heat Transfer In a gas-liquid shell and tube heat exchanger, the

Heat Transfer Nusselt number is the ratio of the

Heat Transfer Which of the following is the most controlling factor for the rate of bubble detachment from the hot solid surface?

Heat Transfer
The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m². The flux, when the element temperature is increased to 1000°C for the same furnace temperature is

Heat Transfer
Fouling factor for a heat exchanger is given by (where, U₁ = heat transfer co-efficient of dirty surface U₂ = heat transfer co-efficient of clean surface)

Heat Transfer
In case of a vertical tube evaporator, with increase in the liquor level, the __________ is increased.

Heat Transfer
In a gas-liquid shell and tube heat exchanger, the

Heat Transfer
Nusselt number is the ratio of the

Heat Transfer
Which of the following is the most controlling factor for the rate of bubble detachment from the hot solid surface?