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
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/A.Cmin

Cmin/U

U.Cmin

U/Cmin

U/A.Cmin

Cmin/U

U.Cmin

U/Cmin

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Heat and Mass Transfer
A grey body is one whose absorptivity

Is equal to its emissivity

Varies with wavelength of the incident ray

Does not vary with temperature and. wavelength of the incident ray

Varies with temperature

Is equal to its emissivity

Varies with wavelength of the incident ray

Does not vary with temperature and. wavelength of the incident ray

Varies with temperature

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Heat and Mass Transfer
The logarithmic mean temperature difference (tm) is given by (where Δt1 and Δt2 are temperature differences between the hot and cold fluids at entrance and exit)

tm = tm = (Δt1 - Δt2) loge (Δt1/Δt2)

tm = loge (Δt1 - Δt2)/ Δt1/Δt2

tm = (Δt1 - Δt2)/ loge (Δt1/Δt2)

tm = loge (Δt1/Δt2)/ (Δt1 - Δt2)

tm = tm = (Δt1 - Δt2) loge (Δt1/Δt2)

tm = loge (Δt1 - Δt2)/ Δt1/Δt2

tm = (Δt1 - Δt2)/ loge (Δt1/Δt2)

tm = loge (Δt1/Δt2)/ (Δt1 - Δt2)

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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

Fourth power of the absolute temperature

Square of the absolute temperature

Absolute temperature

Cube of the absolute temperature

Fourth power of the absolute temperature

Square of the absolute temperature

Absolute temperature

Cube of the absolute temperature

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Heat and Mass Transfer
The value of the wavelength for maximum emissive power is given by

Fourier's law

Wien’s law

Stefan's law

Planck's law

Fourier's law

Wien’s law

Stefan's law

Planck's law

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Heat and Mass Transfer
The radiation emitted by a black body is known as

Black radiation

Total radiation

Full radiation

All of these

Black radiation

Total radiation

Full radiation

All of these

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Heat and Mass Transfer

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 A grey body is one whose absorptivity

Heat and Mass Transfer The logarithmic mean temperature difference (tm) is given by (where Δt1 and Δt2 are temperature differences between the hot and cold fluids at entrance and exit)

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 value of the wavelength for maximum emissive power is given by

Heat and Mass Transfer The radiation emitted by a black body is known as

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
A grey body is one whose absorptivity

Heat and Mass Transfer
The logarithmic mean temperature difference (tm) is given by (where Δt1 and Δt2 are temperature differences between the hot and cold fluids at entrance and exit)

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 value of the wavelength for maximum emissive power is given by

Heat and Mass Transfer
The radiation emitted by a black body is known as