Blowdown in a cooling tower__________________?

Byadmin February 15, 2019August 22, 2021

Blowdown in a cooling tower__________________?

A. Means discarding a small fraction of circulating water to prevent and limit the concentration
of salt and impurities
B. Increases the scale forming tendencies of water
C. Is undesirable
D. All A., B. & C.

CHEMICAL ENGINEERING | Mass Transfer

Mass transfer co-efficient is defined as

Question: Mass transfer co-efficient is defined as
[A].

Flux = Co-efficient/concentration difference.
[B].
Co-efficient = Flux/concentration difference.
[C].
Flux=concentration difference/co-effi-cient.
[D].
none of these.

Answer: Option B

Explanation:

No answer description available for this question.

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CHEMICAL ENGINEERING | Mass Transfer

__________ equation applies to diffusivities in liquids.

Question: __________ equation applies to diffusivities in liquids.
[A].

Gilliland
[B].
Hirschfelder
[C].
Wilke and Chang
[D].
none of these

Answer: Option A

Explanation:

No answer description available for this question.

Read More __________ equation applies to diffusivities in liquids.
Mass Transfer

Flash distillation is suitable for separating the constituents of a binary system, which _____________________?

Flash distillation is suitable for separating the constituents of a binary system, which _____________________?

A. Form minimum boiling azeotrope
B. Have very wide boiling points
C. Have very close boiling points
D. Form constant boiling azeotrope

Read More Flash distillation is suitable for separating the constituents of a binary system, which _____________________?
CHEMICAL ENGINEERING | Mass Transfer

Channelling is most severe

Question: Channelling is most severe
[A].

in towers packed with stacked packing.
[B].
in towers packed randomly with crushed solids.
[C].
in dumped packing of regular units.
[D].
at very high liquid flow rate.

Answer: Option A

Explanation:

No answer description available for this question.

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Mass Transfer

In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be_____________________?

In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be_____________________?

A. At ground level
B. 2 metres above the ground
C. 5 metres above ground
D. 10 metres above ground

Read More In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be_____________________?
Mass Transfer

Priming in a distillation column_________________?

Priming in a distillation column_________________?

A. Results from very low gas velocity
B. Is desirable from point efficiency consideration
C. Is characterised by the presence of foam throughout the space between trays
D. Reduces the overall pressure drop

Read More Priming in a distillation column_________________?

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