A composite flat wall of a furnace is made of two materials 'A' and 'B'. The thermal conductivity of 'A' is twice of that of material 'B', while the thickness of layer of 'A' is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material 'A' is

Heat Transfer
A composite flat wall of a furnace is made of two materials 'A' and 'B'. The thermal conductivity of 'A' is twice of that of material 'B', while the thickness of layer of 'A' is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material 'A' is

133

150

160

125

133

150

160

125

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Heat Transfer
__________ paint has the minimum absorption co-efficient.

Black

Grey

Light cream

White lead

Black

Grey

Light cream

White lead

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Heat Transfer
Convective heat transfer, in which heat is transferred by movement of warmed matter is described by

Fourier's law

None of these

Newton's law of cooling

Fick's law

Fourier's law

None of these

Newton's law of cooling

Fick's law

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Heat Transfer
Double pipe heat exchangers are used

because it occupies less floor area

when heat transfer area required is very high

when heat transfer area required is very low

because it is less costly

because it occupies less floor area

when heat transfer area required is very high

when heat transfer area required is very low

because it is less costly

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Heat Transfer
The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body)

α 1/T

αT

Independent of T

α T⁴

α 1/T

αT

Independent of T

α T⁴

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Heat Transfer
In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass __________ through the heat exchanger.

Once

Twice

Thrice

Four times

Once

Twice

Thrice

Four times

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Heat Transfer

Heat Transfer __________ paint has the minimum absorption co-efficient.

Heat Transfer Convective heat transfer, in which heat is transferred by movement of warmed matter is described by

Heat Transfer Double pipe heat exchangers are used

Heat Transfer The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body)

Heat Transfer In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass __________ through the heat exchanger.

Heat Transfer
__________ paint has the minimum absorption co-efficient.

Heat Transfer
Convective heat transfer, in which heat is transferred by movement of warmed matter is described by

Heat Transfer
Double pipe heat exchangers are used

Heat Transfer
The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body)

Heat Transfer
In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass __________ through the heat exchanger.