Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone.

Heat Transfer
Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone.

transition

laminar

None of the listed here

highly turbulent

transition

laminar

None of the listed here

highly turbulent

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Heat Transfer
A body is called grey if the monochromatic emissivity of the body is

Unity

Same for all wavelengths

Zero

Different for all wavelengths

Unity

Same for all wavelengths

Zero

Different for all wavelengths

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Heat Transfer
Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the

None of these

Temperature gradient produced due to density difference

Buoyancy of the bubbles produced at active nucleation site

Existence of thermal boundary layer

None of these

Temperature gradient produced due to density difference

Buoyancy of the bubbles produced at active nucleation site

Existence of thermal boundary layer

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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 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

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

All of these

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

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

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

All of these

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Heat Transfer
Water always boils when its

Saturated vapour pressure equals the external pressure on its surface

Vapour pressure equals 76 cm of Hg

Saturated vapour pressure is less than the atmospheric pressure

Temperature reaches 100° C

Saturated vapour pressure equals the external pressure on its surface

Vapour pressure equals 76 cm of Hg

Saturated vapour pressure is less than the atmospheric pressure

Temperature reaches 100° C

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Heat Transfer
If heat transfer rate varies with the time, it is termed as

Monochromatic radiation

None of these

Forced convection

Steady state conduction

Monochromatic radiation

None of these

Forced convection

Steady state conduction

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Heat Transfer

Heat Transfer Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone.

Heat Transfer A body is called grey if the monochromatic emissivity of the body is

Heat Transfer Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the

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

Heat Transfer Water always boils when its

Heat Transfer If heat transfer rate varies with the time, it is termed as

Heat Transfer
Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone.

Heat Transfer
A body is called grey if the monochromatic emissivity of the body is

Heat Transfer
Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the

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

Heat Transfer
Water always boils when its

Heat Transfer
If heat transfer rate varies with the time, it is termed as