Maximum size reduction in a fluid energy mill is achieved by___________________?
A. Compression
B. Interparticle attrition
C. Cutting
D. Impact
Month: February 2019
Ultracentrifuges running at speeds upto 100000 rpm is normally used for the_____________________?
Ultracentrifuges running at speeds upto 100000 rpm is normally used for the_____________________?
A. Separation of isotopes based on their density or molecular weights difference
B. Concentration of rubber latex
C. Separation of cream from milk
D. Dewaxing of lubricating oil
Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is_______________?
Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is_______________?
A. Added to the feed slurry
B. Pre-coated on the filter medium prior to filtration
C. Separated from the cake by dissolving solids or by burning it off
D. All A, B. & C.
Trommels are revolving screens which normally operate in the range of _______________ rpm?
Trommels are revolving screens which normally operate in the range of _______________ rpm?
A. 1 – 2
B. 15 – 20
C. 40 – 50
D. 60 – 75
The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle) ?
The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle) ?
A. 6/D.ρ
B. 2/D.ρ
C. 4/D.ρ
D. 12/D.ρ
For sizing of fine materials, the most suitable equipment is a____________________?
For sizing of fine materials, the most suitable equipment is a____________________?
A. Trommel
B. Grizzly
C. Shaking screen
D. Vibrating screen
The main differentiation factor between tube mill and ball mill is the ___________________?
The main differentiation factor between tube mill and ball mill is the ___________________?
A. Length to diameter ratio
B. Size of the grinding media
C. Final product size
D. Operating speed
During agitation of liquids, power consumption during laminar flow is not proportional to the ________________?
During agitation of liquids, power consumption during laminar flow is not proportional to the ________________?
A. Density of the liquid
B. Viscosity of the liquid
C. Cube of impeller diameters
D. Square of rotational speed
In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called _____________ is produced?
In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called _____________ is produced?
A. Concentrate
B. Tailing
C. Middling
D. None of these
Moore filter is a ______________ filter ?
Moore filter is a ______________ filter ?
A. Leaf
B. Press
C. Rotary
D. Sand