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

60°C

40°C

66.7°C

20°C

60°C

40°C

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Wien's law

Planck's law

Stefan's law

Kirchhoff's law

Wien's law

Planck's law

Stefan's law

Kirchhoff's law

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Does not affect the intervening medium

Do not move actually

Move actually

Affect the intervening medium

Does not affect the intervening medium

Do not move actually

Move actually

Affect the intervening medium

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.

Maximum energy

Both (A) and (B)

None of these

Minimum energy

Maximum energy

Both (A) and (B)

None of these

Minimum energy

ANSWER DOWNLOAD EXAMIANS APP

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

Convection

Conduction and convection

Radiation

Conduction

Convection

Conduction and convection

Radiation

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
According to Prevost theory of heat exchange

Heat transfer in most of the cases takes place by combination of conduction, convection and radiation

Heat transfer by radiation requires no medium

It is impossible to transfer heat from low temperature source to t high temperature source

All bodies above absolute zero emit radiation

Heat transfer in most of the cases takes place by combination of conduction, convection and radiation

Heat transfer by radiation requires no medium

It is impossible to transfer heat from low temperature source to t high temperature source

All bodies above absolute zero emit radiation

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer

Heat and Mass Transfer The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Heat and Mass Transfer The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Heat and Mass Transfer Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.

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 According to Prevost theory of heat exchange

Heat and Mass Transfer
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Heat and Mass Transfer
The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Heat and Mass Transfer
Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.

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
According to Prevost theory of heat exchange