______________ are used for the separation of coarse particles from a slurry of fine particles?
A. Thickeners
B. Classifiers
C. Hydrocyclones
D. Decanters
Mechanical Operations
Use of grinding aids results in the ___________________?
Use of grinding aids results in the ___________________?
A. Enhanced production rate
B. Finer products
C. Both A. & B.
D. Neither A. nor B.
In a ball mill, the volume occupied by the balls (when the mill is stopped) is about _______________ percent of the volume of the mill?
In a ball mill, the volume occupied by the balls (when the mill is stopped) is about _______________ percent of the volume of the mill?
A. 35
B. 50
C. 70
D. 85
Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the____________________?
Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the____________________?
A. Density separation
B. Differential wettability
C. Size
D. Volatile matter content
Critical speed of rotation, N (in rps – rotation per second) of a trammel is equal to (where, g = acceleration due to gravity = 9.81 m/sec2 and, r = radius of trammel, metre.) ?
Critical speed of rotation, N (in rps – rotation per second) of a trammel is equal to (where, g = acceleration due to gravity = 9.81 m/sec2 and, r = radius of trammel, metre.) ?
A. (1/2π). √(g/r)
B. (1/π). √(g/r)
C. ½ √(g/r)
D. 2π. √(g/r)
General crushing equation is given by d(P/m) = -K (dD̅ S/D̅ n S). Bond’s crushing law is obtained by solving this equation for n = _____________ and feed of infinite size?
General crushing equation is given by d(P/m) = -K (dD̅ S/D̅ n S). Bond’s crushing law is obtained by solving this equation for n = _____________ and feed of infinite size?
A. 1
B. 1.5
C. 2
D. 2.5
Removal of activated carbon from glycerine is done by _________________?
Removal of activated carbon from glycerine is done by _________________?
A. Plate and frame filter
B. Rotary vacuum filter
C. Batch basket centrifuge
D. None of these
The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an______________?
The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an______________?
A. Bag filter
B. Electrostatic precipitator
C. Cyclone separator
D. Wet scrubber
Chance process is used for the________________?
Chance process is used for the________________?
A. Cleaning of coal
B. Concentration of iron ore
C. Concentration of pyrites
D. Water treatment
Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the _____________ filtration?
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