Related Questions

Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the __________ filtration.
A Constant rate
B Varying pressure
C Varying rate
D Constant pressure
The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant __________ filtration.
A Rate
B Pressure
C Both A & B
D Neither A nor B
During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration
A At time zero
B At the end of filtration
C When half the filtrate has been obtained
D At the end of filtration, but decreases with time subsequently
A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ρL) located at a radial distance R from the axis of rotation. The thickness of the liquid film is δ and no cake is formed. The initial pressure drop during filtration is
A $$\frac{1}{2}$$w2.R2.ρL
B $$\frac{1}{2}$$w2.δ2.ρL
C $$\frac{1}{2}$$w2.δ.ρL(2R + δ)
D $$\frac{1}{2}$$w2.R.ρL(R + 2δ)
The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.
A Decreases
B Increases
C Remains constant
D May increase or decrease ; depends on the chemical characteristics of polluted water
Which of the following is used as a coagulant in water treatment?
A Chloramine
B Chlorine
C Ferrous sulphate
D Hydrogen peroxide
The coagulant which is generally not used for treating the sewage, is
A Alum
B Ferric chloride
C Ferric sulphate
D Chlorinated coppers
Which of the following is used as a coagulant in treating turbid water?
A Chlorine
B Ferric sulphate
C Calcium sulphate
D Activated carbon
The most widely used coagulant for removing suspended impurities from water is
A Bleaching powder
B Chlorine
C Calcium sulphate
D Alum
Most widely and commonly used coagulant for the removal of suspended impurities in water is
A Bleaching powder
B Slaked lime
C Alum
D Copper sulphate

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