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.Management Sciences
Category: Mechanical Operations
Size measurement of ultrafine particles can be best expressed in terms of___________________?
0
A. Centimetre
B. Screen size
C. Micron
D. Surface area per unit mass
If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the __________________?
A. Sedimentation
B. Flocculation
C. Dispersion
D. Centrifugation
Screen efficiency is______________________?
A. Recovery/rejection
B. Recovery
C. Rejection
D. None of these
Mixer used for rubber compounding is__________________?
A. mixer-extruder
B. Banbury internal mixer
C. Muller mixer
D. Pug mill
Which is a secondary crusher for a hard & tough stone ?
A. Jaw crusher
B. Cone crusher
C. Impact crusher
D. Toothed roll crusher
To get a fine talc powder from its granules, the equipment used is____________________?
A. Roller crusher
B. Ball mill
C. Jaw crusher
D. Gyratory crusher
Equivalent diameter of a particle is the diameter of the sphere having the same __________________?
A. Ratio of surface to volume as the actual volume
B. Ratio of volume to surface as the particle
C. Volume as the particle
D. None of these
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.
The work index in Bond’s law for crushing of solids has the following dimensions__________________?
A. No units (dimensionless)
B. kWh/ton
C. kW/ton
D. kWh.m1/2/ton
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