Mechanical Operations A tube mill as compared to a ball mill Employs smaller balls Gives finer size reduction but consumes more power Has larger length/diameter ratio (>2 as compared to 1 for ball mill) All of these Employs smaller balls Gives finer size reduction but consumes more power Has larger length/diameter ratio (>2 as compared to 1 for ball mill) All of these ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be 3.34 Wi 0.5 Wi 1.34 Wi Wi 3.34 Wi 0.5 Wi 1.34 Wi Wi ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an Cyclone separator Wet scrubber Electrostatic precipitator Bag filter Cyclone separator Wet scrubber Electrostatic precipitator Bag filter ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The critical speed of a trommel (N) is related to its dia (D) as N ∝ 1/√D N ∝ 1/D N ∝ √D N ∝ D N ∝ 1/√D N ∝ 1/D N ∝ √D N ∝ D ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately ? Rittinger's law Kick's law None of these Bond's law Rittinger's law Kick's law None of these Bond's law ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations A belt conveyor used for the transportation of materials can Run upto 1 km Travel at a speed upto 300 metres/minute All of these Handle materials upto 5000 tons/hr Run upto 1 km Travel at a speed upto 300 metres/minute All of these Handle materials upto 5000 tons/hr ANSWER DOWNLOAD EXAMIANS APP
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