The radiation emitted by a black body is known as

Heat and Mass Transfer
The radiation emitted by a black body is known as

Black radiation

Total radiation

All of these

Full radiation

Black radiation

Total radiation

All of these

Full radiation

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Heat and Mass Transfer
Depending on the radiating properties, a body will be black when(Where a = absorptivity, p = reflectivity, X = transmissivity.)

P = 0, x = 1 and a = 0

P = 0, x = 0 and a = 1

P= 1, T = 0 and a = 0

X = 0, a + p = 0

P = 0, x = 1 and a = 0

P = 0, x = 0 and a = 1

P= 1, T = 0 and a = 0

X = 0, a + p = 0

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Heat and Mass Transfer
The heat is transferred by conduction, convection and radiation in

Condensation of steam in condenser

None of these

Boiler furnaces

Melting of ice

Condensation of steam in condenser

None of these

Boiler furnaces

Melting of ice

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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

Two

One

Three

Four

Two

One

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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
When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by

Conduction

Radiation

Conduction and convection

Convection

Conduction

Radiation

Conduction and convection

Convection

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Heat and Mass Transfer

Heat and Mass Transfer The radiation emitted by a black body is known as

Heat and Mass Transfer Depending on the radiating properties, a body will be black when(Where a = absorptivity, p = reflectivity, X = transmissivity.)

Heat and Mass Transfer The heat is transferred by conduction, convection and radiation in

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

Heat and Mass Transfer When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by

Heat and Mass Transfer
The radiation emitted by a black body is known as

Heat and Mass Transfer
Depending on the radiating properties, a body will be black when(Where a = absorptivity, p = reflectivity, X = transmissivity.)

Heat and Mass Transfer
The heat is transferred by conduction, convection and radiation in

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

Heat and Mass Transfer
When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by