In counter flow compared to parallel flow, ?

Byadmin March 3, 2019August 24, 2021

In counter flow compared to parallel flow, ?

A. LMTD is greater
B. Less surface area is required for a given heat transfer rate
C. Both A. and B.
D. More surface area is required for a given heat transfer rate

Chemical 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 ___________________?

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 ___________________?

A. t = 283 s
B. t = 356 s
C. t = 400 s
D. t = 800 s

Read More 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 ___________________?
Chemical Heat Transfer

_______________ paint has the maximum absorption coefficient ?

_______________ paint has the maximum absorption coefficient ?

A. Black
B. Yellow
C. White
D. Grey

Read More _______________ paint has the maximum absorption coefficient ?
Chemical Heat Transfer

Heat exchangers operating, when the asymptotic range is reached, ?

Heat exchangers operating, when the asymptotic range is reached, ?

A. Provide very large heat transfer co-efficient
B. Results in making part of the heating surface inactive
C. Results in abruptly increased velocity
D. None of these

Read More Heat exchangers operating, when the asymptotic range is reached, ?
Chemical Heat Transfer

As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient ?

As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient ?

A. Continues to increase
B. Continues to decrease
C. Goes through a minimum
D. Goes through a maximum

Read More As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient ?
Chemical Heat Transfer

Choose the most important factor on which the heat conducted through a wall in a unit time will depend on ?

Choose the most important factor on which the heat conducted through a wall in a unit time will depend on ?

A. Thickness of the wall
B. Area of the wall perpendicular to heat flow
C. Material of the wall
D. Temperature difference between the two surfaces of the wall

Read More Choose the most important factor on which the heat conducted through a wall in a unit time will depend on ?
Chemical Heat Transfer

Mode of heat transfer involved in the cooling of air cooled internal combustion engine is_________________?

Mode of heat transfer involved in the cooling of air cooled internal combustion engine is_________________?

A. Conduction
B. Natural convection
C. Forced convection
D. None of these

Read More Mode of heat transfer involved in the cooling of air cooled internal combustion engine is_________________?

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