A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time

Heat Transfer
A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time

t = 800 s

t = 400 s

t = 283 s

t = 356 s

t = 800 s

t = 400 s

t = 283 s

t = 356 s

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Heat Transfer
Temperature profile in steady state heat transfer is

parabolic

Linear

none of the listed here

hyperbolic

parabolic

Linear

none of the listed here

hyperbolic

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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

Between two bodies in physical contact with each other

Both B & C

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

Between two bodies not in physical contact with each other

Between two bodies in physical contact with each other

Both B & C

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

Between two bodies not in physical contact with each other

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Heat Transfer
In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is

Zero

Same as average heat transfer co-efficient for tube side

None of these

Infinity

Zero

Same as average heat transfer co-efficient for tube side

None of these

Infinity

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Heat Transfer
Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the

Sum of all resistances

Minimum resistance presents in the series

Average of all resistances

Maximum resistance in the series

Sum of all resistances

Minimum resistance presents in the series

Average of all resistances

Maximum resistance in the series

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Heat Transfer
Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is

0.1

L

>1

< 1

0.1

L

>1

< 1

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Heat Transfer

Heat Transfer Temperature profile in steady state heat transfer 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 In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is

Heat Transfer Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the

Heat Transfer Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is

Heat Transfer
Temperature profile in steady state heat transfer 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
In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is

Heat Transfer
Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the

Heat Transfer
Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is