Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)

Heat and Mass Transfer
Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)

k.

k. (dx/dT)

k.

(dx/dT)

(dT/dx)

k. (dT/dx)

k.

k. (dx/dT)

k.

(dx/dT)

(dT/dx)

k. (dT/dx)

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Heat and Mass Transfer
Moisture would find its way into insulation by vapour pressure unless it is prevented by

High thickness of insulation

A vapour seal

Less thermal conductivity insulator

High vapour pressure

High thickness of insulation

A vapour seal

Less thermal conductivity insulator

High vapour pressure

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Heat and Mass Transfer
The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Does not affect the intervening medium

Do not move actually

Affect the intervening medium

Move actually

Does not affect the intervening medium

Do not move actually

Affect the intervening medium

Move actually

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

P = 0, x = 0 and a = 1

P=1, x = 0 and a = 0

P = 0, x = 1 and a = 0

X = 0, a + p = 1

P = 0, x = 0 and a = 1

P=1, x = 0 and a = 0

P = 0, x = 1 and a = 0

X = 0, a + p = 1

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Heat and Mass Transfer
The automobile radiator is a heat exchanger of

Counter flow type

Cross flow type

Regenerator type

Parallel flow type

Counter flow type

Cross flow type

Regenerator type

Parallel flow type

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Heat and Mass Transfer
The emissive power of a body depends upon its

All of these

Wave length

Physical nature

Temperature

All of these

Wave length

Physical nature

Temperature

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Heat and Mass Transfer

Heat and Mass Transfer Moisture would find its way into insulation by vapour pressure unless it is prevented by

Heat and Mass Transfer The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

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

Heat and Mass Transfer The automobile radiator is a heat exchanger of

Heat and Mass Transfer The emissive power of a body depends upon its

Heat and Mass Transfer
Moisture would find its way into insulation by vapour pressure unless it is prevented by

Heat and Mass Transfer
The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

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

Heat and Mass Transfer
The automobile radiator is a heat exchanger of

Heat and Mass Transfer
The emissive power of a body depends upon its