When vaporisation takes place directly at the heating surface, it is called

Heat Transfer
When vaporisation takes place directly at the heating surface, it is called

nucleate boiling

vapour binding

film boiling

all of the listed here

nucleate boiling

vapour binding

film boiling

all of the listed here

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Heat Transfer
Steady state one dimensional heat flow by conduction as given by Fourier's low does not assume that

Boundary surfaces are isothermal

Material is anisotropic

There is no internal heat generation

Constant temperature gradient exists

Boundary surfaces are isothermal

Material is anisotropic

There is no internal heat generation

Constant temperature gradient exists

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Heat Transfer
In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be

More than 45°C

Equal to 45°C

Less than 45°C

Initially decreases and remains constant thereafter

More than 45°C

Equal to 45°C

Less than 45°C

Initially decreases and remains constant thereafter

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Heat Transfer
Multipass heat exchangers are used

Because of simplicity of fabrication

To reduce the pressure drop

To obtain higher heat transfer co-efficient and shorter tube

For low heat load

Because of simplicity of fabrication

To reduce the pressure drop

To obtain higher heat transfer co-efficient and shorter tube

For low heat load

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Heat Transfer
The thermal radiation emitted by a body is proportional to Tn, where T is its absolute temperature. The value of 'n' is exactly 4 for

A black body

All bodies

Polished bodies only

Black painted bodies only

A black body

All bodies

Polished bodies only

Black painted bodies only

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

All of these

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

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

All of these

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

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

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Heat Transfer

Heat Transfer When vaporisation takes place directly at the heating surface, it is called

Heat Transfer Steady state one dimensional heat flow by conduction as given by Fourier's low does not assume that

Heat Transfer In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be

Heat Transfer Multipass heat exchangers are used

Heat Transfer The thermal radiation emitted by a body is proportional to Tn, where T is its absolute temperature. The value of 'n' is exactly 4 for

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

Heat Transfer
When vaporisation takes place directly at the heating surface, it is called

Heat Transfer
Steady state one dimensional heat flow by conduction as given by Fourier's low does not assume that

Heat Transfer
In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be

Heat Transfer
Multipass heat exchangers are used

Heat Transfer
The thermal radiation emitted by a body is proportional to Tn, where T is its absolute temperature. The value of 'n' is exactly 4 for

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