In regenerator type heat exchanger, heat transfer takes place by

Heat and Mass Transfer
In regenerator type heat exchanger, heat transfer takes place by

Flow of hot and cold fluids alternately over a surface

Generation of heat again and again

Direct mixing of hot and cold fluids

A complete separation between hot and cold fluids

Flow of hot and cold fluids alternately over a surface

Generation of heat again and again

Direct mixing of hot and cold fluids

A complete separation between hot and cold fluids

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Heat and Mass Transfer
Heat transfer takes place as per

Kirchoff's law

Second law of the thermodynamics

Zeroth law of thermodynamics

First law of thermodynamic

Kirchoff's law

Second law of the thermodynamics

Zeroth law of thermodynamics

First law of thermodynamic

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

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

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

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

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 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
Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)

h = k/ ρS

h = ρS/k

h = S/ρk

h = kρ/S

h = k/ ρS

h = ρS/k

h = S/ρk

h = kρ/S

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Heat and Mass Transfer
The radiation emitted by a black body is known as

All of these

Full radiation

Black radiation

Total radiation

All of these

Full radiation

Black radiation

Total radiation

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Heat and Mass Transfer
Fouling factor is used

None of these

In heat exchanger design as a safety factor

In case of Newtonian fluids

When a liquid exchanges heat with a gas

None of these

In heat exchanger design as a safety factor

In case of Newtonian fluids

When a liquid exchanges heat with a gas

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Heat and Mass Transfer

Heat and Mass Transfer In regenerator type heat exchanger, heat transfer takes place by

Heat and Mass Transfer Heat transfer takes place as per

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

Heat and Mass Transfer Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)

Heat and Mass Transfer The radiation emitted by a black body is known as

Heat and Mass Transfer Fouling factor is used

Heat and Mass Transfer
In regenerator type heat exchanger, heat transfer takes place by

Heat and Mass Transfer
Heat transfer takes place as per

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

Heat and Mass Transfer
Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)

Heat and Mass Transfer
The radiation emitted by a black body is known as

Heat and Mass Transfer
Fouling factor is used