Heat flows from one body to other when they have

Heat and Mass Transfer
Heat flows from one body to other when they have

Different specific heat

Different temperatures

Different heat contents

Different atomic structure

Different specific heat

Different temperatures

Different heat contents

Different atomic structure

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Heat and Mass Transfer
The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as

Reflectivity

Intensity of radiation

Transmissivity

Emissivity

Reflectivity

Intensity of radiation

Transmissivity

Emissivity

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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

Two

Four

Three

One

Two

Four

Three

One

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

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

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

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

None of these

Thermometer

Thermistor

Thermocouple

None of these

Thermometer

Thermistor

Thermocouple

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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

Four

One

Three

Two

Four

One

Three

Two

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer

Heat and Mass Transfer Heat flows from one body to other when they have

Heat and Mass Transfer The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as

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

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

Heat and Mass Transfer
Heat flows from one body to other when they have

Heat and Mass Transfer
The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as

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

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