Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be

Heat and Mass Transfer
Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be

Four

One

Two

Three

Four

One

Two

Three

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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

U.Cmin

U/A.Cmin

Cmin/U

U/Cmin

U.Cmin

U/A.Cmin

Cmin/U

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Heat and Mass Transfer
In free convection heat transfer, Nusselt number is function of

Grashoff number and Prandtl number

Prandtl number and Reynold number

Grashoff number and Reynold number

Grashoff number, Prandtl number and Reynold number

Grashoff number and Prandtl number

Prandtl number and Reynold number

Grashoff number and Reynold number

Grashoff number, Prandtl number and Reynold number

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Heat and Mass Transfer
Absorptivity of a body will be equal to its emissivity

When system is under thermal equilibrium

At one particular temperature

At all temperatures

At critical temperature

When system is under thermal equilibrium

At one particular temperature

At all temperatures

At critical temperature

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

Film coefficient × Inside diameter Thermal conductivity

Thermal conductivity Equivalent thickness of film Specific heat × Viscosity

Equivalent thickness of film

Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity

Film coefficient × Inside diameter Thermal conductivity

Thermal conductivity Equivalent thickness of film Specific heat × Viscosity

Equivalent thickness of film

Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity

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Heat and Mass Transfer
According to Wien's law, the wavelength corresponding to maximum energy is proportion to

F

Absolute temperature (T)

T

I²

F

Absolute temperature (T)

T

I²

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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 In free convection heat transfer, Nusselt number is function of

Heat and Mass Transfer Absorptivity of a body will be equal to its emissivity

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

Heat and Mass Transfer According to Wien's law, the wavelength corresponding to maximum energy is proportion to

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
In free convection heat transfer, Nusselt number is function of

Heat and Mass Transfer
Absorptivity of a body will be equal to its emissivity

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

Heat and Mass Transfer
According to Wien's law, the wavelength corresponding to maximum energy is proportion to