A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

Heat and Mass Transfer
A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

(h₁.h₂.h₃)1/3

1/h₁ + 1/h₂ + 1/h₃

h₁ + h₂ + h₃

None of these

(h₁.h₂.h₃)1/3

1/h₁ + 1/h₂ + 1/h₃

h₁ + h₂ + h₃

None of these

ANSWER DOWNLOAD EXAMIANS APP

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

P = 0, x = 0 and a = 1

X = 0, a + p = 1

P=1, x = 0, and a = 0

P = 0, x= 1, and a = 0

P = 0, x = 0 and a = 1

X = 0, a + p = 1

P=1, x = 0, and a = 0

P = 0, x= 1, and a = 0

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
Which of the following is the case of heat transfer by radiation?

Heating of building

Heat received by a person from fireplace

Blast furnace

Cooling of parts in furnace

Heating of building

Heat received by a person from fireplace

Blast furnace

Cooling of parts in furnace

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
Cork is a good insulator because it has

Free electrons

Porous body

Atoms colliding frequency

Low density

Free electrons

Porous body

Atoms colliding frequency

Low density

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
The use of heat exchangers is made in

All of these

Condensers and evaporators in refrigeration and air conditioning units

Radiators in automobile

Condensers and boilers in steam plants

All of these

Condensers and evaporators in refrigeration and air conditioning units

Radiators in automobile

Condensers and boilers in steam plants

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
Thermal conductivity of water at 20°C is of the order of

0.1

0.42

0.51

0.23

0.1

0.42

0.51

0.23

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer

Heat and Mass Transfer A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

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

Heat and Mass Transfer Which of the following is the case of heat transfer by radiation?

Heat and Mass Transfer Cork is a good insulator because it has

Heat and Mass Transfer The use of heat exchangers is made in

Heat and Mass Transfer Thermal conductivity of water at 20°C is of the order of

Heat and Mass Transfer
A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

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

Heat and Mass Transfer
Which of the following is the case of heat transfer by radiation?

Heat and Mass Transfer
Cork is a good insulator because it has

Heat and Mass Transfer
The use of heat exchangers is made in

Heat and Mass Transfer
Thermal conductivity of water at 20°C is of the order of