Additives used for promoting the floccula-tion of particles is a/an electrolyte

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Question
Additives used for promoting the floccula-tion of particles is a/an
Options
A. electrolyte
B. surface active agent
C. both (a) & (b)
D. neither (a) nor (b)

Correct Answer

both (a) & (b)

Mechanical Operations problems

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1. Weber number is significant and is concerned with the
Options
A. solid-liquid mixing.
B. liquid-liquid mixing.
C. dispersion of liquid in liquid.
D. suspension of solid in liquid.

2. Which of the following can be most effectively used for clarification of lube oil and printing ink?
Options
A. Sparkler filter
B. Precoat filter
C. Disc-bowl centrifuge
D. Sharpies supercentrifuge

4. The basic filtration equation is given as where, V is volume of the filtrate ; A is the filtration area, a is specific cake resistance, ? is viscosity of the filtrate, and C is the concentration of the solids in the feed slurry.
In a 20 minutes constant rate filtration, 5 m³ of filtrate was obtained. If this is followed by a constant pressure filtration, how much more time in minutes, it will take for another 5 m³ of filtrate to be produced? Neglect filter medium resistance, Rm ; assume incompressible cake.
Options
A. 10
B. 20
C. 25
D. 30

6. The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area, m² V = rising velocity of fluid, m/sec.S = percentage of solids in the suspension by volume.? = density of solids, kg/m³)
Options
A. 3.6 AVS.?
B. 3.6 A.V.?
C. 3.6 A.S. ?
D. 3.6 AVS/?

7. The porosity of a compressible cake is
Options
A. minimum at the filter medium.
B. minimum at the upstream face.
C. maximum at the filter medium.
D. same throughout the thickness of cake.

10. In the cyclone separator used for separation of dust from dust laden gas, the gas
Options
A. enters the cyclone from the top.
B. is admitted tangentially at high velocity.
C. develops a helical motion inside the chamber.
D. both (b) and (c).

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