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 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

One could place either insulation on either side

The better insulation must be put outside

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Heat and Mass Transfer
Thermal conductivity of solid metals with rise in temperature normally

Remain constant

Increases

May increase or decrease depending on temperature

Decreases

Remain constant

Increases

May increase or decrease depending on temperature

Decreases

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

X = 0, a + p = 1

P = 0, x = 1 and a = 0

P=1, x = 0 and a = 0

P = 0, x = 0 and a = 1

X = 0, a + p = 1

P = 0, x = 1 and a = 0

P=1, x = 0 and a = 0

P = 0, x = 0 and a = 1

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Heat and Mass Transfer
The ratio of the energy absorbed by the body to total energy falling on it is called

Emissivity

Absorptive power

Emissive power

Absorptivity

Emissivity

Absorptive power

Emissive power

Absorptivity

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Heat and Mass Transfer
The product of Reynolds number and Prandtl number is known as

Stanton number

Grashoff number

Peclet number

Biot number

Stanton number

Grashoff number

Peclet number

Biot number

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Heat and Mass Transfer
Which of the following would lead to a reduction in thermal resistance?

In conduction, reduction in the thickness of the material and an increase in thermal conductivity.

In radiation, increasing the temperature and reducing the emissivity.

In convection, stirring of the fluid and cleaning the heating surface.

All of these

In conduction, reduction in the thickness of the material and an increase in thermal conductivity.

In radiation, increasing the temperature and reducing the emissivity.

In convection, stirring of the fluid and cleaning the heating surface.

All of these

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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 solid metals with rise in temperature normally

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

Heat and Mass Transfer The ratio of the energy absorbed by the body to total energy falling on it is called

Heat and Mass Transfer The product of Reynolds number and Prandtl number is known as

Heat and Mass Transfer Which of the following would lead to a reduction in thermal resistance?

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 solid metals with rise in temperature normally

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

Heat and Mass Transfer
The ratio of the energy absorbed by the body to total energy falling on it is called

Heat and Mass Transfer
The product of Reynolds number and Prandtl number is known as

Heat and Mass Transfer
Which of the following would lead to a reduction in thermal resistance?