Mechanical Operations For efficient grinding, ball mills must be operated At a speed equal to the critical speed With minimum possible small balls At a speed less than the critical speed At a speed more than the critical speed At a speed equal to the critical speed With minimum possible small balls At a speed less than the critical speed At a speed more than the critical speed ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations As particle size is reduced None of these Capacity and effectiveness of the screen is increased Screening becomes progressively easier Screening becomes progressively more difficult None of these Capacity and effectiveness of the screen is increased Screening becomes progressively easier Screening becomes progressively more difficult ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations A belt conveyor used for the transportation of materials can Travel at a speed upto 300 metres/minute Handle materials upto 5000 tons/hr All of these Run upto 1 km Travel at a speed upto 300 metres/minute Handle materials upto 5000 tons/hr All of these Run upto 1 km ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is 0.62 0.58 0.68 0.5 0.62 0.58 0.68 0.5 ANSWER DOWNLOAD EXAMIANS APP
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? Wet grinding in high viscous suspension Dry grindng of large particles in un-baffed mills Dry grinding of large particles (upto 1.25 cms) Wet grinding in low viscous suspension Wet grinding in high viscous suspension Dry grindng of large particles in un-baffed mills Dry grinding of large particles (upto 1.25 cms) Wet grinding in low viscous suspension ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The value of 'angle of nip' is generally about 16° 52° 32° 64° 16° 52° 32° 64° ANSWER DOWNLOAD EXAMIANS APP
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