Which of the following is not a part of the Blake jaw crusher ?
Which of the following is not a part of the Blake jaw crusher ?
A. Hanger
B. Check plates
C. Toggles
D. Pitman
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Mixing mechanism employed in a pan mixer is by ________________?
Mixing mechanism employed in a pan mixer is by ________________?A. Mulling
B. Kneading
C. Dispersion
D. None of theseWork 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. 4.34Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed ?
Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed ?A. Wet grinding in low viscous suspension
B. Wet grinding in high viscous suspension
C. Dry grinding of large particles (upto 1.25 cms)
D. Dry grinding of large particles in un-baffed millsWhat is the selectivity index, if the grade of tailings & concentrate is the same ?
What is the selectivity index, if the grade of tailings & concentrate is the same ?A. 0
B. ∞
C. 1
D. 0.5_____________ is the most commonly used ‘filter aid’?
_____________ is the most commonly used ‘filter aid’?A. Diatomaceous earth
B. Fuller’s earth
C. Vermiculite
D. Semi-plastic clayFlow of filtrate through the cake in a plate and frame filter press is best described by the ______________ equation?
Flow of filtrate through the cake in a plate and frame filter press is best described by the ______________ equation?A. Kozeny-Carman
B. Hagen-Poiseuille’s
C. Fanning’s
D. Kremser