Mechanical Operations 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? Dry grindng of large particles in un-baffed mills Wet grinding in low viscous suspension Wet grinding in high viscous suspension Dry grinding of large particles (upto 1.25 cms) Dry grindng of large particles in un-baffed mills Wet grinding in low viscous suspension Wet grinding in high viscous suspension Dry grinding of large particles (upto 1.25 cms) ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration At the end of filtration At time zero When half the filtrate has been obtained At the end of filtration, but decreases with time subsequently At the end of filtration At time zero When half the filtrate has been obtained At the end of filtration, but decreases with time subsequently ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The controlling resistance in a rotary drum vacuum filter is the __________ resistance. Piping Filter medium None of these Cake Piping Filter medium None of these Cake ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Screw conveyors are Suitable for highly abrasive materials All of these Run at very high rpm Suitable for sticky materials Suitable for highly abrasive materials All of these Run at very high rpm Suitable for sticky materials ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations 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). V/D.S V/6D.S S/V 6.V/D.S V/D.S V/6D.S S/V 6.V/D.S ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Xanthates are used in the froth floatation process as a/an Collector Frother Conditioner Activator Collector Frother Conditioner Activator ANSWER DOWNLOAD EXAMIANS APP
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