The use of heat exchangers is made in

Heat and Mass Transfer
The use of heat exchangers is made in

Radiators in automobile

Condensers and boilers in steam plants

Condensers and evaporators in refrigeration and air conditioning units

All of these

Radiators in automobile

Condensers and boilers in steam plants

Condensers and evaporators in refrigeration and air conditioning units

All of these

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Heat and Mass Transfer
The critical temperature is the temperature

Below which a gas is always liquefied

Above which a gas will never liquefied

Above which a gas may explode

Below which a gas does not obey gas laws

Below which a gas is always liquefied

Above which a gas will never liquefied

Above which a gas may explode

Below which a gas does not obey gas laws

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Heat and Mass Transfer
A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

h₁ + h₂ + h₃

(h₁.h₂.h₃)1/3

None of these

1/h₁ + 1/h₂ + 1/h₃

h₁ + h₂ + h₃

(h₁.h₂.h₃)1/3

None of these

1/h₁ + 1/h₂ + 1/h₃

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Heat and Mass Transfer
The rate of energy transferred by convection to that by conduction is called

Biot number

Peclet number

Stanton number

Nusselt number

Biot number

Peclet number

Stanton number

Nusselt number

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Heat and Mass Transfer
Thermal diffusivity is

Used as mathematical model

A dimensionless parameter

Function of temperature

A physical property of the material

Used as mathematical model

A dimensionless parameter

Function of temperature

A physical property of the material

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

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

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

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Heat and Mass Transfer

Heat and Mass Transfer The use of heat exchangers is made in

Heat and Mass Transfer The critical temperature is the temperature

Heat and Mass Transfer A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

Heat and Mass Transfer The rate of energy transferred by convection to that by conduction is called

Heat and Mass Transfer Thermal diffusivity is

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

Heat and Mass Transfer
The use of heat exchangers is made in

Heat and Mass Transfer
The critical temperature is the temperature

Heat and Mass Transfer
A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

Heat and Mass Transfer
The rate of energy transferred by convection to that by conduction is called

Heat and Mass Transfer
Thermal diffusivity is

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