According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the

Heat and Mass Transfer
According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the

Square of the absolute temperature

Fourth power of the absolute temperature

Absolute temperature

Cube of the absolute temperature

Square of the absolute temperature

Fourth power of the absolute temperature

Absolute temperature

Cube of the absolute temperature

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Heat and Mass Transfer
The ratio of the energy absorbed by the body to total energy falling on it is called

Absorptive power

Emissive power

Absorptivity

Emissivity

Absorptive power

Emissive power

Absorptivity

Emissivity

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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)

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Heat and Mass Transfer
A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

U.Cmin

Cmin/U

U/A.Cmin

U/Cmin

U.Cmin

Cmin/U

U/A.Cmin

U/Cmin

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

All of these

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

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

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 a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C

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

Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

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Heat and Mass Transfer
Metals are good conductors of heat because

Their atoms collide frequently

Their atoms are relatively far apart

They contain free electrons

They have high density

Their atoms collide frequently

Their atoms are relatively far apart

They contain free electrons

They have high density

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Heat and Mass Transfer

Heat and Mass Transfer According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the

Heat and Mass Transfer The ratio of the energy absorbed by the body to total energy falling on it is called

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 heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

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

Heat and Mass Transfer Metals are good conductors of heat because

Heat and Mass Transfer
According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the

Heat and Mass Transfer
The ratio of the energy absorbed by the body to total energy falling on it is called

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 heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

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

Heat and Mass Transfer
Metals are good conductors of heat because