Metals are good conductors of heat because

Heat and Mass Transfer
Metals are good conductors of heat because

They have high density

Their atoms are relatively far apart

Their atoms collide frequently

They contain free electrons

They have high density

Their atoms are relatively far apart

Their atoms collide frequently

They contain free electrons

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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 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

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

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Heat and Mass Transfer
Heat transfer in liquid and gases takes place by

Conduction

Radiation

Conduction and convection

Convection

Conduction

Radiation

Conduction and convection

Convection

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Heat and Mass Transfer
A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is

40°C

20°C

66.7°C

60°C

40°C

20°C

66.7°C

60°C

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Heat and Mass Transfer
The ratio of surface convection resistance to the internal conduction resistance is known as

Prandtl number

Grashoff number

Stanton number

Biot number

Prandtl number

Grashoff number

Stanton number

Biot number

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Heat and Mass Transfer
The emissive power of a body depends upon its

Physical nature

Wave length

All of these

Temperature

Physical nature

Wave length

All of these

Temperature

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Heat and Mass Transfer

Heat and Mass Transfer Metals are good conductors of heat because

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

Heat and Mass Transfer Heat transfer in liquid and gases takes place by

Heat and Mass Transfer The ratio of surface convection resistance to the internal conduction resistance is known as

Heat and Mass Transfer The emissive power of a body depends upon its

Heat and Mass Transfer
Metals are good conductors of heat because

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

Heat and Mass Transfer
Heat transfer in liquid and gases takes place by

Heat and Mass Transfer
The ratio of surface convection resistance to the internal conduction resistance is known as

Heat and Mass Transfer
The emissive power of a body depends upon its