A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,

Heat and Mass Transfer
A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,

One could place either insulation on either side

The better insulation must be put outside

One should take into account the steam temperature before deciding as to which insulation is put where

The better insulation must be put inside

One could place either insulation on either side

The better insulation must be put outside

One should take into account the steam temperature before deciding as to which insulation is put where

The better insulation must be put inside

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Heat and Mass Transfer
Thermal conductivity of non-metallic amorphous solids with decrease in temperature

Increases

Decreases

May increase or decrease depending on temperature

Remain constant

Increases

Decreases

May increase or decrease depending on temperature

Remain constant

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Heat and Mass Transfer
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

0.02

0.01

0.002

0.1

0.02

0.01

0.002

0.1

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Heat and Mass Transfer
Depending on the radiating properties, a body will be opaque when

P=1, x = 0 and a = 0

X = 0, a + p = 1

P = 0, x = 0 and a = 1

P = 0, x = 1 and a = 0

P=1, x = 0 and a = 0

X = 0, a + p = 1

P = 0, x = 0 and a = 1

P = 0, x = 1 and a = 0

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Heat and Mass Transfer
Film coefficient is defined as the ratio of

Thermal conductivity to the equivalent thickness of the film of fluid

Thickness of film of fluid to the thermal conductivity

Temperature drop through the films of fluids to the thickness of film of fluids

Thickness of film of fluid to the temperature drop through the films of fluids

Thermal conductivity to the equivalent thickness of the film of fluid

Thickness of film of fluid to the thermal conductivity

Temperature drop through the films of fluids to the thickness of film of fluids

Thickness of film of fluid to the temperature drop through the films of fluids

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Heat and Mass Transfer
According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a

Black body

Grey body

Red hot body

Brilliant white polished body

Black body

Grey body

Red hot body

Brilliant white polished body

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Heat and Mass Transfer

Heat and Mass Transfer A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,

Heat and Mass Transfer Thermal conductivity of non-metallic amorphous solids with decrease in temperature

Heat and Mass Transfer Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

Heat and Mass Transfer Depending on the radiating properties, a body will be opaque when

Heat and Mass Transfer Film coefficient is defined as the ratio of

Heat and Mass Transfer According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a

Heat and Mass Transfer
A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,

Heat and Mass Transfer
Thermal conductivity of non-metallic amorphous solids with decrease in temperature

Heat and Mass Transfer
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

Heat and Mass Transfer
Depending on the radiating properties, a body will be opaque when

Heat and Mass Transfer
Film coefficient is defined as the ratio of

Heat and Mass Transfer
According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a