All radiations in a black body are

Heat and Mass Transfer
All radiations in a black body are

Transmitted

Reflected

Refracted

Absorbed

Transmitted

Reflected

Refracted

Absorbed

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Heat and Mass Transfer
The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law.

Inversely proportional to

None of these

Directly proportional to

Equal to

Inversely proportional to

None of these

Directly proportional to

Equal to

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Heat and Mass Transfer
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

0.1

0.02

0.01

0.002

0.1

0.02

0.01

0.002

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

Equivalent thickness of film

Film coefficient × Inside diameter Thermal conductivity

Thermal conductivity Equivalent thickness of film Specific heat × Viscosity

Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity

Equivalent thickness of film

Film coefficient × Inside diameter Thermal conductivity

Thermal conductivity Equivalent thickness of film Specific heat × Viscosity

Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity

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

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

All of these

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

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

All of these

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
The time constant of a thermocouple is

The time taken to attain 50% of the value of initial temperature difference

The time taken to attain the final temperature to be measured

Determined by the time taken to reach 100°C from 0°C

The time taken to attain 63.2% of the value of initial temperature difference

The time taken to attain 50% of the value of initial temperature difference

The time taken to attain the final temperature to be measured

Determined by the time taken to reach 100°C from 0°C

The time taken to attain 63.2% of the value of initial temperature difference

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Heat and Mass Transfer

Heat and Mass Transfer All radiations in a black body are

Heat and Mass Transfer The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law.

Heat and Mass Transfer Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

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

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

Heat and Mass Transfer The time constant of a thermocouple is

Heat and Mass Transfer
All radiations in a black body are

Heat and Mass Transfer
The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law.

Heat and Mass Transfer
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

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

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

Heat and Mass Transfer
The time constant of a thermocouple is