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Chemical Heat Transfer

In a heat exchanger, floating head is provided to____________________?

August 24, 2021March 3, 2019 by admin
In a heat exchanger, floating head is provided to____________________?

A. Facilitate cleaning of the exchanger
B. Increase the heat transfer area
C. Relieve stresses caused by thermal expansion
D. Increase log mean temperature gradient

Categories Chemical Heat Transfer

Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid ?

August 24, 2021March 3, 2019 by admin
Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid ?

A. Bleed point
B. Vent
C. Catchall
D. Baffle

Categories Chemical Heat Transfer

The equivalent diameter for pressure drop is ________________ that for heat transfer?

August 24, 2021March 3, 2019 by admin
The equivalent diameter for pressure drop is ________________ that for heat transfer?

A. Smaller than
B. Greater than
C. Equal to
D. Not related with

Categories Chemical Heat Transfer

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

August 24, 2021March 3, 2019 by admin
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

Categories Chemical Heat Transfer

Fouling factor_____________________?

August 24, 2021March 3, 2019 by admin
Fouling factor_____________________?

A. Is a dimensionless quantity
B. Does not provide a safety factor for design
C. Accounts for additional resistances to heat flow
D. None of these

Categories Chemical Heat Transfer

If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid_________________?

August 24, 2021March 3, 2019 by admin
If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid_________________?

A. Remains unchanged
B. Increases
C. Increases or decreases depending on number of shell passes
D. Decreases

Categories Chemical Heat Transfer

The unit of heat transfer co-efficient in SI unit is____________________?

August 24, 2021March 3, 2019 by admin
The unit of heat transfer co-efficient in SI unit is____________________?

A. J/M2°K
B. W/m2°K
C. W/m°K
D. J/m°K

Categories Chemical Heat Transfer

Which type of heat exchanger is preferred for heavy heat loads ?

August 24, 2021March 3, 2019 by admin
Which type of heat exchanger is preferred for heavy heat loads ?

A. Double pipe
B. Plate fine
C. Series and parallel set of shell and tube
D. None of these

Categories Chemical Heat Transfer

With increase in porosity, the thermal conductivity of a solid substance__________________?

August 24, 2021March 3, 2019 by admin
With increase in porosity, the thermal conductivity of a solid substance__________________?

A. Increases
B. Decreases
C. Remains unchanged
D. May increase or decrease; depends on the solid

Categories Chemical Heat Transfer

Vacuum is generally maintained in the vapour space of an evaporator mainly to__________________?

August 24, 2021March 3, 2019 by admin
Vacuum is generally maintained in the vapour space of an evaporator mainly to__________________?

A. Get economical temperature difference by using moderate pressure steam
B. Facilitate forward feeding in multiple effect evaporation
C. Concentrate heat sensitive materials
D. Achieve very high concentration of the final product

Categories Chemical Heat Transfer
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