A. Bag filter
B. Electrostatic precipitator
C. Cyclone separator
D. Wet scrubber
A. Cleaning of coal
B. Concentration of iron ore
C. Concentration of pyrites
D. Water treatment
A. Constant rate
B. Varying pressure
C. Varying rate
D. Constant pressure
A. Reynold’s
B. Froude
C. Both A. & B.
D. Neither A. nor B.
A. Froude number is independent for the curves between power number and Reynolds number in
baffled system
B. Power number becomes independent of impellers Reynolds number at high Reynolds number,
but is dependent on the geometry of the impeller
C. Froude number is used to account for the effect of surface (e.g., the centre vortex) on the
power number
D. All A., B. and C.
A. Jet mills
B. Fluid energy mill
C. Micronizer
D. All A., B. and C.
A. Blending miscible liquids
B. Non-flowing powder and thin pastes
C. Bath mixing
D. Continuous mixing
A. Nc = (1/4π). √(g/R1 – R2)
B. Nc = (1/2π). √(g/R1 – R2)
C. Nc = (1/π). √(g/R1 – R2)
D. Nc = (1/2π). √(R1 – R2/g)
A. 3 to 4
B. 8 to 10
C. 10 to 15
D. 15 to 20
A. Disc bowl centrifuge
B. Sharpies super-centrifuge
C. Batch basket centrifuge
D. Sparkler filter