Chemical Heat Transfer

For specified tube outside diameter, higher BWG means higher___________________?

Byadmin March 3, 2019August 24, 2021

For specified tube outside diameter, higher BWG means higher___________________?

A. Tube thickness
B. Cross-sectional area
C. Weight per unit length
D. None of these

Chemical Heat Transfer

If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is hl then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length________________?

If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is hl then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length________________?

A. ha = hl
B. ha = 2hl
C. ha = 0.5 hl
D. ha = 0.75 hl

Read More If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is hl then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length________________?
Chemical Heat Transfer

The advantage of backward feed multiple effect evaporators over forward feed units is that___________________?

The advantage of backward feed multiple effect evaporators over forward feed units is that___________________?

A. Heat sensitive material can be handled
B. There is no additional cost of pumg
C. Most concentrated liquid is at highest temperature
D. Equal heat transfer co-efficients exist in various effects

Read More The advantage of backward feed multiple effect evaporators over forward feed units is that___________________?
Chemical Heat Transfer

For what value of Prandtl number, St = f/2 ?

For what value of Prandtl number, St = f/2 ?

A. 1.5
B. 1
C. > 1
D. < 1

Read More For what value of Prandtl number, St = f/2 ?
Chemical Heat Transfer

It is not recommended to use a 1-2 shell and tube heat exchanger for a particular heat duty, whenever the LMTD correction factor is___________________?

It is not recommended to use a 1-2 shell and tube heat exchanger for a particular heat duty, whenever the LMTD correction factor is___________________?

A. > 0.75
B. < 0.75
C. < 0.50
D. < 0.25

Read More It is not recommended to use a 1-2 shell and tube heat exchanger for a particular heat duty, whenever the LMTD correction factor is___________________?
Chemical Heat Transfer

Multiple effect evaporation is generally recommended, when the______________________?

Multiple effect evaporation is generally recommended, when the______________________?

A. Large scale evaporation of liquor is needed
B. Corrosive liquids are to be concentrated
C. Fuel is cheaply available
D. Evaporation on small scale is to be done

Read More Multiple effect evaporation is generally recommended, when the______________________?
Chemical Heat Transfer

The separation of liquid droplets from the vapor is done by a/an _____________ in the evaporators?

The separation of liquid droplets from the vapor is done by a/an _____________ in the evaporators?

A. Steam ejector
B. Entrainment separator
C. Compressor
D. Vacuum pump

Read More The separation of liquid droplets from the vapor is done by a/an _____________ in the evaporators?

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