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

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

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
Upto the critical radius of insulation,

Convective heat loss will be less than conductive heat loss

Heat flux will decrease

Added insulation will increase heat loss

Added insulation will decrease heat loss

Convective heat loss will be less than conductive heat loss

Heat flux will decrease

Added insulation will increase heat loss

Added insulation will decrease heat loss

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Move actually

Do not move actually

Does not affect the intervening medium

Affect the intervening medium

Move actually

Do not move actually

Does not affect the intervening medium

Affect the intervening medium

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
Fouling factor is used

None of these

When a liquid exchanges heat with a gas

In heat exchanger design as a safety factor

In case of Newtonian fluids

None of these

When a liquid exchanges heat with a gas

In heat exchanger design as a safety factor

In case of Newtonian fluids

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
The rate of energy transferred by convection to that by conduction is called

Stanton number

Peclet number

Nusselt number

Biot number

Stanton number

Peclet number

Nusselt number

Biot number

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as

Forced convection

Free convection

Radiation

Conduction

Forced convection

Free convection

Radiation

Conduction

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer

Heat and Mass Transfer Upto the critical radius of insulation,

Heat and Mass Transfer The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Heat and Mass Transfer Fouling factor is used

Heat and Mass Transfer The rate of energy transferred by convection to that by conduction is called

Heat and Mass Transfer The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as

Heat and Mass Transfer
Upto the critical radius of insulation,

Heat and Mass Transfer
The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Heat and Mass Transfer
Fouling factor is used

Heat and Mass Transfer
The rate of energy transferred by convection to that by conduction is called

Heat and Mass Transfer
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as