A fluid energy mill is used for_________________?
A fluid energy mill is used for_________________?
A. Cutting
B. Grinding
C. Ultra grinding
D. Crushing
Mechanical Operations
-
-
Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid ?
Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid ?A. Sand bed filter
B. Plate and frame filter press
C. Vacuum filter
D. Batch basket centrifuge -
The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake)__________________?
The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake)__________________?A. ∝ ΔP
B. ∝ 1/ ΔP
C. ∝ √ΔP
D. Independent of ΔP -
Filtration capacity of a rotary drum vacuum filter depends upon the_______________?
Filtration capacity of a rotary drum vacuum filter depends upon the_______________?A. Cake thickness
B. Characteristics of the feed slurry
C. Both A. & B.
D. Neither A. nor B. -
Bond crushing law_________________?
Bond crushing law_________________?A. Calls for relatively less energy for the smaller product particles, than does the Rittinger law
B. Is less realistic in estimating the power requirements of commercial crushers
C. States that the work required to form particle of any size from very large feed is proportional
to the square root of the volume to surface ratio of the product
D. States that the work required for the crushing is proportional to the new surface created -
Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle)?
Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle)?A. 6.V/D.S
B. V/6D.S
C. D.S/V
D. V/D.S -
A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for _______________ flow of filtrate?
A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for _______________ flow of filtrate?A. Compressible cakes and laminar
B. Incompressible cake and laminar
C. Compressible cake and turbulent
D. Incompressible cake and turbulent -
Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with ______________ to get the same for dry grinding?
Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with ______________ to get the same for dry grinding?A. 1.0
B. 0.5
C. 1.34
D. 4.34 -
Which of the following is not used as a surface active agent in a flocculation operation ?
Which of the following is not used as a surface active agent in a flocculation operation ?A. Sodium silicate
B. Quartz
C. Lime
D. Alumina -
For transporting pasty material, one will use a/an__________________?
For transporting pasty material, one will use a/an__________________?A. Apron conveyor
B. Belt conveyor
C. Screw conveyor
D. Bucket elevator