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

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

Absolute temperature

T2

T

T5

Absolute temperature

T2

T

T5

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Heat and Mass Transfer
Joule sec is the unit of

Planck's constant

Thermal conductivity

Kinematic viscosity

Universal gas constant

Planck's constant

Thermal conductivity

Kinematic viscosity

Universal gas constant

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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 one cm cube of material when opposite faces are maintained at a temperature difference of 1°C

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

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 one cm cube of material when opposite faces are maintained at a temperature difference of 1°C

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

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

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Heat and Mass Transfer
The time constant of a thermocouple is

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

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

The time taken to attain the final temperature to be measured

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

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

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

The time taken to attain the final temperature to be measured

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

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Heat and Mass Transfer
Which of the following property of air does not increase with rise in temperature?

Density

Dynamic viscosity

Thermal conductivity

Thermal diffusivity

Density

Dynamic viscosity

Thermal conductivity

Thermal diffusivity

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Heat and Mass Transfer
In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

Reynold's number, Grashoff's number

Grashoff's number

Prandtl number, Grashoff's number

Reynold's number

Reynold's number, Grashoff's number

Grashoff's number

Prandtl number, Grashoff's number

Reynold's number

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Heat and Mass Transfer

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

Heat and Mass Transfer Joule sec is the unit of

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 Which of the following property of air does not increase with rise in temperature?

Heat and Mass Transfer In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

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

Heat and Mass Transfer
Joule sec is the unit of

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
Which of the following property of air does not increase with rise in temperature?

Heat and Mass Transfer
In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the