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. (dT/dx)

k. (dx/dT)

(dx/dT)

(dT/dx)

k.

k. (dT/dx)

k. (dx/dT)

(dx/dT)

(dT/dx)

k.

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Heat and Mass Transfer
When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,

α = 0, ρ = 1 and τ = 0

α + ρ = 1 and τ = 0

α = 0, ρ = 0 and τ = 1

α = 1, ρ = 0 and τ = 0

α = 0, ρ = 1 and τ = 0

α + ρ = 1 and τ = 0

α = 0, ρ = 0 and τ = 1

α = 1, ρ = 0 and τ = 0

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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

Absorptivity

Emissive power

Absorptive power

Emissivity

Absorptivity

Emissive power

Absorptive power

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Heat and Mass Transfer
According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)

Pb = pa/pv

Pb = pa - pv

Pb = pa + pv

Pb = pa × pv

Pb = pa/pv

Pb = pa - pv

Pb = pa + pv

Pb = pa × pv

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Heat and Mass Transfer
The heat is transferred by conduction, convection and radiation in

Condensation of steam in condenser

Boiler furnaces

None of these

Melting of ice

Condensation of steam in condenser

Boiler furnaces

None of these

Melting of ice

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Heat and Mass Transfer
Which of the following is a case of steady state heat transfer?

Heating of building in winter

I.C. engine

Air preheaters

None of these

Heating of building in winter

I.C. engine

Air preheaters

None of these

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Heat and Mass Transfer

Heat and Mass Transfer When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,

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 According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)

Heat and Mass Transfer The heat is transferred by conduction, convection and radiation in

Heat and Mass Transfer Which of the following is a case of steady state heat transfer?

Heat and Mass Transfer
When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,

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
According to Dalton's law of partial pressures, (where pb = Barometric pressure, pa = Partial pressure of dry air, and pv = Partial pressure of water vapour)

Heat and Mass Transfer
The heat is transferred by conduction, convection and radiation in

Heat and Mass Transfer
Which of the following is a case of steady state heat transfer?