Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade?

Heat Transfer
Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade?

48.25

35.5

81.25

43.75

48.25

35.5

81.25

43.75

ANSWER DOWNLOAD EXAMIANS APP

Heat Transfer
At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical?

None of these

< 1

1

> 1

None of these

< 1

1

> 1

ANSWER DOWNLOAD EXAMIANS APP

Heat Transfer
An insulator should have

Low thermal conductivity

A porous structure

High thermal conductivity

Less resistance to heat flow

Low thermal conductivity

A porous structure

High thermal conductivity

Less resistance to heat flow

ANSWER DOWNLOAD EXAMIANS APP

Heat Transfer
In Biot number, the characteristic length used is the ratio of the __________ of the solid.

Surface area to volume

Perimeter to surface area

Surface area to perimeter

Volume to surface area

Surface area to volume

Perimeter to surface area

Surface area to perimeter

Volume to surface area

ANSWER DOWNLOAD EXAMIANS APP

Heat Transfer
The left face of a one dimensional slab of thickness 0.2 m is maintained at 80°C and the right face is exposed to air at 30°C. The thermal conductivity of the slab is 1.2 W/m.K and the heat transfer co-efficient from the right face is 10 W/m².K. At steady state, the temperature of the right face in °C is

71.2

77.2

63.8

48.7

71.2

77.2

63.8

48.7

ANSWER DOWNLOAD EXAMIANS APP

Heat Transfer
The equivalent diameter for pressure drop is __________ that for heat transfer

equal to

None of the listed here

smaller than

greater than

equal to

None of the listed here

smaller than

greater than

ANSWER DOWNLOAD EXAMIANS APP

Heat Transfer

Heat Transfer At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical?

Heat Transfer An insulator should have

Heat Transfer In Biot number, the characteristic length used is the ratio of the __________ of the solid.

Heat Transfer The equivalent diameter for pressure drop is __________ that for heat transfer

Heat Transfer
At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical?

Heat Transfer
An insulator should have

Heat Transfer
In Biot number, the characteristic length used is the ratio of the __________ of the solid.

Heat Transfer
The equivalent diameter for pressure drop is __________ that for heat transfer