Reynolds number is the ratio of

Heat and Mass Transfer
Reynolds number is the ratio of

None of these

Kinematic viscosity to thermal diffusivity

Energy transferred by convection to that by conduction

Inertia force to viscous force

None of these

Kinematic viscosity to thermal diffusivity

Energy transferred by convection to that by conduction

Inertia force to viscous force

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Heat and Mass Transfer
The emissive power of a body depends upon its

All of these

Wave length

Physical nature

Temperature

All of these

Wave length

Physical nature

Temperature

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

10 TR

4 TR

2 TR

8 TR

10 TR

4 TR

2 TR

8 TR

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Heat and Mass Transfer
Unit of thermal diffusivity is

m²/hr °C

m²/hr

kcal/m. hr °C

kcal/m² hr

m²/hr °C

m²/hr

kcal/m. hr °C

kcal/m² hr

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

Thermal conductivity

Thermal diffusivity

Dynamic viscosity

Density

Thermal conductivity

Thermal diffusivity

Dynamic viscosity

Density

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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

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 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

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

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Heat and Mass Transfer

Heat and Mass Transfer Reynolds number is the ratio of

Heat and Mass Transfer The emissive power of a body depends upon its

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

Heat and Mass Transfer Unit of thermal diffusivity is

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

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

Heat and Mass Transfer
Reynolds number is the ratio of

Heat and Mass Transfer
The emissive power of a body depends upon its

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

Heat and Mass Transfer
Unit of thermal diffusivity is

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

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