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

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

60°C

66.7°C

20°C

40°C

60°C

66.7°C

20°C

40°C

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Heat and Mass Transfer
Conduction is a process of heat transfer

None of these

From a hot body to a cold body, in a straight line, without affecting the intervening medium

From one particle of the body to another without the actual motion of the particles

From one particle of the body to another by the actual motion of the heated particles

None of these

From a hot body to a cold body, in a straight line, without affecting the intervening medium

From one particle of the body to another without the actual motion of the particles

From one particle of the body to another by the actual motion of the heated particles

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Heat and Mass Transfer
When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by

Conduction and convection

Conduction

Radiation

Convection

Conduction and convection

Conduction

Radiation

Convection

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Heat and Mass Transfer
The thermal diffusivities for gases are generally

Less than those for liquids

More than those for liquids

Dependent on the viscosity

More than those for solids

Less than those for liquids

More than those for liquids

Dependent on the viscosity

More than those for solids

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Heat and Mass Transfer
Thermal conductivity of water _________ with rise in temperature.

Increases

May increase or decrease depending upon temperature

Remain same

Decreases

Increases

May increase or decrease depending upon temperature

Remain same

Decreases

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Heat and Mass Transfer
Depending on the radiating properties, a body will be white when (Where a = absorptivity, p = reflectivity, x = transmissivity)

P=1, T = 0 and a = 0

P = 0, x = 1 and a = 0

X = 0, a + p = 1

P = 0, x = 0 and a = 1

P=1, T = 0 and a = 0

P = 0, x = 1 and a = 0

X = 0, a + p = 1

P = 0, x = 0 and a = 1

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Heat and Mass Transfer

Heat and Mass Transfer Conduction is a process of heat transfer

Heat and Mass Transfer When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by

Heat and Mass Transfer The thermal diffusivities for gases are generally

Heat and Mass Transfer Thermal conductivity of water _________ with rise in temperature.

Heat and Mass Transfer Depending on the radiating properties, a body will be white when (Where a = absorptivity, p = reflectivity, x = transmissivity)

Heat and Mass Transfer
Conduction is a process of heat transfer

Heat and Mass Transfer
When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by

Heat and Mass Transfer
The thermal diffusivities for gases are generally

Heat and Mass Transfer
Thermal conductivity of water _________ with rise in temperature.

Heat and Mass Transfer
Depending on the radiating properties, a body will be white when (Where a = absorptivity, p = reflectivity, x = transmissivity)