The use of heat exchangers is made in

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

Condensers and evaporators in refrigeration and air conditioning units

All of these

Condensers and boilers in steam plants

Radiators in automobile

Condensers and evaporators in refrigeration and air conditioning units

All of these

Condensers and boilers in steam plants

Radiators in automobile

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Heat and Mass Transfer
Which of the following is the case of heat transfer by radiation?

Cooling of parts in furnace

Heating of building

Heat received by a person from fireplace

Blast furnace

Cooling of parts in furnace

Heating of building

Heat received by a person from fireplace

Blast furnace

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Heat and Mass Transfer
The thermal diffusivities for solids are generally

Less than those for liquids

Less than those for gases

More or less same as for liquids and gases

More than those for liquids and gases

Less than those for liquids

Less than those for gases

More or less same as for liquids and gases

More than those for liquids and gases

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Heat and Mass Transfer
The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called

Radiation

Conduction

None of these

Convection

Radiation

Conduction

None of these

Convection

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

All of these

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

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

All of these

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

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

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Heat and Mass Transfer
Thermal conductivity of water at 20°C is of the order of

0.23

0.1

0.42

0.51

0.23

0.1

0.42

0.51

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Heat and Mass Transfer

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

Heat and Mass Transfer Which of the following is the case of heat transfer by radiation?

Heat and Mass Transfer The thermal diffusivities for solids are generally

Heat and Mass Transfer The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called

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

Heat and Mass Transfer Thermal conductivity of water at 20°C is of the order of

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

Heat and Mass Transfer
Which of the following is the case of heat transfer by radiation?

Heat and Mass Transfer
The thermal diffusivities for solids are generally

Heat and Mass Transfer
The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called

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

Heat and Mass Transfer
Thermal conductivity of water at 20°C is of the order of