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?

43.75

48.25

35.5

81.25

43.75

48.25

35.5

81.25

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Heat Transfer
The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m². The flux, when the element temperature is increased to 1000°C for the same furnace temperature is

11.2 kW/m²

14.6 kW/m²

16.5 kW/m²

12.0 kW/m²

11.2 kW/m²

14.6 kW/m²

16.5 kW/m²

12.0 kW/m²

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Heat Transfer
Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer can not take place

From one part of a body to the another part of the same body

Both B & C

Between two bodies in physical contact with each other

Between two bodies not in physical contact with each other

From one part of a body to the another part of the same body

Both B & C

Between two bodies in physical contact with each other

Between two bodies not in physical contact with each other

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Heat Transfer
Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second.

10

30

20

1

10

30

20

1

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Heat Transfer
In a backward feed multiple effect evaporator

No pumps are required between successive effects

Feed is introduced in the first effect

Feed flows from low pressure to high pressure

None of these

No pumps are required between successive effects

Feed is introduced in the first effect

Feed flows from low pressure to high pressure

None of these

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Heat Transfer
With increase in porosity, the thermal conductivity of a solid substance

Increases

Decreases

Remains unchanged

May increase or decrease; depends on the solid

Increases

Decreases

Remains unchanged

May increase or decrease; depends on the solid

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Heat Transfer

Heat Transfer The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m². The flux, when the element temperature is increased to 1000°C for the same furnace temperature is

Heat Transfer Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer can not take place

Heat Transfer Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second.

Heat Transfer In a backward feed multiple effect evaporator

Heat Transfer With increase in porosity, the thermal conductivity of a solid substance

Heat Transfer
The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m². The flux, when the element temperature is increased to 1000°C for the same furnace temperature is

Heat Transfer
Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer can not take place

Heat Transfer
Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second.

Heat Transfer
In a backward feed multiple effect evaporator

Heat Transfer
With increase in porosity, the thermal conductivity of a solid substance