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This quiz contains multiple-choice problems on mechanical separation basics, solid separation by screening, screening equipment, solid particles’ classification, magnetic separation, electrostatic separator, floatation, sedimentation, thickeners and cyclone separators.
In the height-concentration plot, the settling zone can be observed between the
Compression and clarification zones
Compression and flowing zones
Maximum height and lowest concentration
Flowing and maximum heights
In a continuous thickener, the area is determined by the
Commination layer
Newton layer
Plank layer
Concentration layer
What does the following equation represent?
q = (u{r} + u{c})AC
Velocity
Charge of feed
Volumetric rate
Magnetic field
After sedimentation, the thickened liquor is withdrawn from
Bottom
Top
Sideways
Blow-off
Calculate the feed rate if volumetric flow is 55 m^3/s and concentration is 0.5.
55
3.5
27.5
50
To obtain the highest throughput, the rate of sedimentation should be
The same
High
Low
Constant
Cone scrapers are bolted to
Bottom end
Centre shaft
Back valve
Dirt separator
What are the size of centered column thickener?
75 ft in diameter
55 ft in diameter
< or = 75 ft in diameter
< or = 55 ft in diameter
When a fluid is passed downwards through a bed of solids, then
Mixing occurs
Laminar flow occurs
Turbulent flow occurs
No movement occurs
Pressure drop across the bed is directly proportional to
Rate of mixing
Rate of sedimentation
Rate of flow
Rate of velocity
When the frictional drag on particles becomes equal to their apparent weight, then
High resistance is seen
Less resistance is seen
No resistance is seen
No change occurs
What does the following equation represent?
p*(1 - C)
Feed rate
Evaporation rate
Mass rate
Pull-over rate
What does the following equation represent?
Q*(1 – C)
Feed rate
Evaporation rate
Drying rate
Pull-over rate
The concentration of a suspension is increased by sedimentation in
Thickener
Boiler
Condenser
Camper
Calculate the feed rate if fluid density is 78.9 kg/m^3 and concentration is 0.03.
1.33
50.2
75.5
76.53
