Fouling factor is used

Heat and Mass Transfer
Fouling factor is used

None of these

In case of Newtonian fluids

In heat exchanger design as a safety factor

When a liquid exchanges heat with a gas

None of these

In case of Newtonian fluids

In heat exchanger design as a safety factor

When a liquid exchanges heat with a gas

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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

None of these

I.C. engine

Air preheaters

Heating of building in winter

None of these

I.C. engine

Air preheaters

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Heat and Mass Transfer
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

RN = hl/k

RN = μ cp/k

RN = V²/t.cp

RN = ρ V l /μ

RN = hl/k

RN = μ cp/k

RN = V²/t.cp

RN = ρ V l /μ

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Heat and Mass Transfer
Thermal conductivity of a material may be defined as the

Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

All of these

Quantity of heat flowing in one second through one cm cube of material when opposite faces are maintained at a temperature difference of 1°C

Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C

Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

All of these

Quantity of heat flowing in one second through one cm cube of material when opposite faces are maintained at a temperature difference of 1°C

Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C

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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

Absorptivity

Emissive power

Absorptive power

Emissivity

Absorptivity

Emissive power

Absorptive power

Emissivity

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Heat and Mass Transfer
Thermal diffusivity is

A physical property of the material

Used as mathematical model

Function of temperature

A dimensionless parameter

A physical property of the material

Used as mathematical model

Function of temperature

A dimensionless parameter

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Heat and Mass Transfer

Heat and Mass Transfer Fouling factor is used

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

Heat and Mass Transfer Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

Heat and Mass Transfer Thermal conductivity of a material may be defined as the

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 Thermal diffusivity is

Heat and Mass Transfer
Fouling factor is used

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

Heat and Mass Transfer
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

Heat and Mass Transfer
Thermal conductivity of a material may be defined as the

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
Thermal diffusivity is