A perfect black body is one which

Heat and Mass Transfer
A perfect black body is one which

Transmits all heat radiations

Is black in colour

Absorbs heat radiations of all wave lengths falling on it

Reflects all heat

Transmits all heat radiations

Is black in colour

Absorbs heat radiations of all wave lengths falling on it

Reflects all heat

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
The ratio of the energy absorbed by the body to total energy falling on it is called

Emissive power

Absorptivity

Absorptive power

Emissivity

Emissive power

Absorptivity

Absorptive power

Emissivity

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
Temperature of steam at around 540°C can be measured by

Thermocouple

None of these

Thermometer

Thermistor

Thermocouple

None of these

Thermometer

Thermistor

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
The value of the wave length for maximum emissive power is given by

Wine’s law

Stefan’s law

Kirchhoff’s law

Planck’s law

Wine’s law

Stefan’s law

Kirchhoff’s law

Planck’s law

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
A grey body is one whose absorptivity

Varies with wavelength of the incident ray

Is equal to its emissivity

Does not vary with temperature and. wavelength of the incident ray

Varies with temperature

Varies with wavelength of the incident ray

Is equal to its emissivity

Does not vary with temperature and. wavelength of the incident ray

Varies with temperature

ANSWER DOWNLOAD EXAMIANS APP

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

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

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

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

All of these

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer

Heat and Mass Transfer A perfect black body is one which

Heat and Mass Transfer The ratio of the energy absorbed by the body to total energy falling on it is called

Heat and Mass Transfer Temperature of steam at around 540°C can be measured by

Heat and Mass Transfer The value of the wave length for maximum emissive power is given by

Heat and Mass Transfer A grey body is one whose absorptivity

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

Heat and Mass Transfer
A perfect black body is one which

Heat and Mass Transfer
The ratio of the energy absorbed by the body to total energy falling on it is called

Heat and Mass Transfer
Temperature of steam at around 540°C can be measured by

Heat and Mass Transfer
The value of the wave length for maximum emissive power is given by

Heat and Mass Transfer
A grey body is one whose absorptivity

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