What is the selectivity index, if the grade of tailings & concentrate is the same ?
A. 0
B. ∞
C. 1
D. 0.5
Month: February 2019
The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond’s law, Rittinger’s law and Kick’s law) depend upon the_________________?
The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond’s law, Rittinger’s law and Kick’s law) depend upon the_________________?
A. Feed material
B. Type of crushing machine
C. Both A. & B.
D. Neither A. nor B.
______________ mean diameter of particles is given by Σ (xi/Dpi ⃗)?
______________ mean diameter of particles is given by Σ (xi/Dpi ⃗)?
A. Mass
B. Volume
C. Arithmetic
D. Volume surface
Who has stepped down as Chairman of the African Union on Feb 10 2019?
Who has stepped down as Chairman of the African Union on Feb 10 2019?A. Paul Kagame (Rwanda President)
B. Cyril Ramaphosa (South Africa President)
C. Emmerson Mnangagwa (President Zimbabwe)
D. Sahle-Work Zewde ( President Ethiopia)
B. Cyril Ramaphosa (South Africa President)
C. Emmerson Mnangagwa (President Zimbabwe)
D. Sahle-Work Zewde ( President Ethiopia)
Horsepower required for a roll crusher is directly proportional to its__________________?
Horsepower required for a roll crusher is directly proportional to its__________________?
A. Reduction ratio
B. Capacity
C. Both A. & B.
D. Neither A. nor B.
Weber number is significant and is concerned with the_________________?
Weber number is significant and is concerned with the_________________?
A. Solid-liquid mixing
B. Liquid-liquid mixing
C. Dispersion of liquid in liquid
D. Suspension of solid in liquid
The unit of specific cake resistance is______________________?
The unit of specific cake resistance is______________________?
A. gm/cm2
B. cm/gm
C. cm/gm2
D. gm/gm
Colloidal mills are used for ______________ grinding?
Colloidal mills are used for ______________ grinding?
A. Coarse
B. Intermediate
C. Fine
D. Ultrafine
Which of the following represents the plot of filtrate volume versus time for constant pressure filtration ?
Which of the following represents the plot of filtrate volume versus time for constant pressure filtration ?
A. Parabola
B. Straight line
C. Hyperbola
D. Exponential curve
In the cyclone separator used for separation of dust from dust laden gas, the gas ?
In the cyclone separator used for separation of dust from dust laden gas, the gas ?
A. Enters the cyclone from the top
B. Is admitted tangentially at high velocity
C. Develops a helical motion inside the chamber
D. Both B. and C.