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

66.7°C

20°C

40°C

60°C

66.7°C

20°C

40°C

60°C

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

P = 0, x = 1 and a = 0

P= 1, T = 0 and a = 0

X = 0, a + p = 0

P = 0, x = 0 and a = 1

P = 0, x = 1 and a = 0

P= 1, T = 0 and a = 0

X = 0, a + p = 0

P = 0, x = 0 and a = 1

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Heat and Mass Transfer
The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as

Reflectivity

Intensity of radiation

Emissivity

Transmissivity

Reflectivity

Intensity of radiation

Emissivity

Transmissivity

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Heat and Mass Transfer
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as

Forced convection

Radiation

Conduction

Free convection

Forced convection

Radiation

Conduction

Free convection

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Heat and Mass Transfer
The automobile radiator is a heat exchanger of

Parallel flow type

Regenerator type

Cross flow type

Counter flow type

Parallel flow type

Regenerator type

Cross flow type

Counter flow type

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Heat and Mass Transfer
LMTD in case of counter flow heat exchanger as compared to parallel flow heat exchanger is

Depends on the area of heat exchanger

Lower

Same

Higher

Depends on the area of heat exchanger

Lower

Same

Higher

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Heat and Mass Transfer

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

Heat and Mass Transfer The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as

Heat and Mass Transfer The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as

Heat and Mass Transfer The automobile radiator is a heat exchanger of

Heat and Mass Transfer LMTD in case of counter flow heat exchanger as compared to parallel flow heat exchanger is

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

Heat and Mass Transfer
The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as

Heat and Mass Transfer
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as

Heat and Mass Transfer
The automobile radiator is a heat exchanger of

Heat and Mass Transfer
LMTD in case of counter flow heat exchanger as compared to parallel flow heat exchanger is