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

Three

Four

One

Two

Three

Four

One

Two

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Heat and Mass Transfer
Fourier's law of heat conduction is valid for

One dimensional cases only

Regular surfaces having non-uniform temperature gradients

Two dimensional cases only

Three dimensional cases only

One dimensional cases only

Regular surfaces having non-uniform temperature gradients

Two dimensional cases only

Three dimensional cases only

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Heat and Mass Transfer
The heat transfer takes place according to

First law of thermodynamics

Zeroth law of thermodynamics

Second law of thermodynamics

Kirchhoff's law

First law of thermodynamics

Zeroth law of thermodynamics

Second law of thermodynamics

Kirchhoff's law

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Heat and Mass Transfer
An ordinary passenger aircraft requires a cooling system of capacity.

8 TR

10 TR

4 TR

2 TR

8 TR

10 TR

4 TR

2 TR

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Heat and Mass Transfer
In heat exchangers, degree of approach is defined as the difference between temperatures of

Cold water inlet and outlet

Hot medium outlet and cold water outlet

Hot medium outlet and cold water inlet

Hot medium inlet and outlet

Cold water inlet and outlet

Hot medium outlet and cold water outlet

Hot medium outlet and cold water inlet

Hot medium inlet and outlet

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Heat and Mass Transfer
The energy distribution of an ideal reflector at higher temperatures is largely in the range of

Shorter wavelength

Wavelength has nothing to do with it

Longer wavelength

Remain same at all wavelengths

Shorter wavelength

Wavelength has nothing to do with it

Longer wavelength

Remain same at all wavelengths

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Heat and Mass Transfer

Heat and Mass Transfer Fourier's law of heat conduction is valid for

Heat and Mass Transfer The heat transfer takes place according to

Heat and Mass Transfer An ordinary passenger aircraft requires a cooling system of capacity.

Heat and Mass Transfer In heat exchangers, degree of approach is defined as the difference between temperatures of

Heat and Mass Transfer The energy distribution of an ideal reflector at higher temperatures is largely in the range of

Heat and Mass Transfer
Fourier's law of heat conduction is valid for

Heat and Mass Transfer
The heat transfer takes place according to

Heat and Mass Transfer
An ordinary passenger aircraft requires a cooling system of capacity.

Heat and Mass Transfer
In heat exchangers, degree of approach is defined as the difference between temperatures of

Heat and Mass Transfer
The energy distribution of an ideal reflector at higher temperatures is largely in the range of