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

40°C

20°C

66.7°C

60°C

40°C

20°C

66.7°C

60°C

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
The heat of sun reaches to us according to

Convection

Conduction

None of these

Radiation

Convection

Conduction

None of these

Radiation

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
Film coefficient is defined as Inside diameter of tube

Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity

Thermal conductivity Equivalent thickness of film Specific heat × Viscosity

Equivalent thickness of film

Film coefficient × Inside diameter Thermal conductivity

Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity

Thermal conductivity Equivalent thickness of film Specific heat × Viscosity

Equivalent thickness of film

Film coefficient × Inside diameter Thermal conductivity

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
A composite slab has two layers of different materials with thermal conductivities k₁ and k₂. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be

(k₁ + k₂)/ k₁ k₂

2 k₁ k₂/ (k₁ + k₂)

k₁ k₂

(k₁ + k₂)

(k₁ + k₂)/ k₁ k₂

2 k₁ k₂/ (k₁ + k₂)

k₁ k₂

(k₁ + k₂)

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
A perfect black body is one which

Is black in colour

Transmits all heat radiations

Reflects all heat

Absorbs heat radiations of all wave lengths falling on it

Is black in colour

Transmits all heat radiations

Reflects all heat

Absorbs heat radiations of all wave lengths falling on it

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
Radiation is the process of heat transfer in which heat flows from a ________, in a straight line, without affecting the intervening medium.

Smaller body to larger body

Cold body to hot body

Hot body to cold body

Larger body to smaller body

Smaller body to larger body

Cold body to hot body

Hot body to cold body

Larger body to smaller body

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer

Heat and Mass Transfer The heat of sun reaches to us according to

Heat and Mass Transfer Film coefficient is defined as Inside diameter of tube

Heat and Mass Transfer A composite slab has two layers of different materials with thermal conductivities k₁ and k₂. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be

Heat and Mass Transfer A perfect black body is one which

Heat and Mass Transfer Radiation is the process of heat transfer in which heat flows from a ________, in a straight line, without affecting the intervening medium.

Heat and Mass Transfer
The heat of sun reaches to us according to

Heat and Mass Transfer
Film coefficient is defined as Inside diameter of tube

Heat and Mass Transfer
A composite slab has two layers of different materials with thermal conductivities k₁ and k₂. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be

Heat and Mass Transfer
A perfect black body is one which

Heat and Mass Transfer
Radiation is the process of heat transfer in which heat flows from a ________, in a straight line, without affecting the intervening medium.