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. A. (dx/dT)

k. (dT/dx)

k. A. (dT/dx)

k. (dx/dT)

k. A. (dx/dT)

k. (dT/dx)

k. A. (dT/dx)

k. (dx/dT)

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Heat and Mass Transfer
Joule sec is the unit of

Kinematic viscosity

Thermal conductivity

Planck's constant

Universal gas constant

Kinematic viscosity

Thermal conductivity

Planck's constant

Universal gas constant

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Heat and Mass Transfer
The value of Prandtl number for air is about

0.7

1.7

0.3

0.1

0.7

1.7

0.3

0.1

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Heat and Mass Transfer
Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called

Thermal resistance

Thermal conductivity

Temperature gradient

Thermal coefficient

Thermal resistance

Thermal conductivity

Temperature gradient

Thermal coefficient

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Heat and Mass Transfer
Which of the following is expected to have highest thermal conductivity?

Solid ice

Melting ice

Steam

Water

Solid ice

Melting ice

Steam

Water

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Heat and Mass Transfer
Unit of thermal conductivity in M.K.S. units is

K cal m/hr m² °C

K cal/hr m² °C

K calm/hr °C

K cal/kg m² °C

K cal m/hr m² °C

K cal/hr m² °C

K calm/hr °C

K cal/kg m² °C

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Heat and Mass Transfer

Heat and Mass Transfer Joule sec is the unit of

Heat and Mass Transfer The value of Prandtl number for air is about

Heat and Mass Transfer Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called

Heat and Mass Transfer Which of the following is expected to have highest thermal conductivity?

Heat and Mass Transfer Unit of thermal conductivity in M.K.S. units is

Heat and Mass Transfer
Joule sec is the unit of

Heat and Mass Transfer
The value of Prandtl number for air is about

Heat and Mass Transfer
Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called

Heat and Mass Transfer
Which of the following is expected to have highest thermal conductivity?

Heat and Mass Transfer
Unit of thermal conductivity in M.K.S. units is