Mechanical Operations Questions

• Grinding efficiency of a ball mill is of the order of __________ percent.
• Filtration capacity of a rotary drum vacuum filter depends upon the
• For efficient grinding, ball mills must be operated
• About 2-3 hp, power per gallon of a thin liquid provides vigrous agitation in an agitator. 'Power number' in agitation is given by
• 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
• Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively.
• In screen analysis, the notation +5 mm/-10 mm means particles passing through
• For the preliminary breaking of hard rock, we use a
• Ultrafine grinders operate principally by
• During agitation of liquids, power consumption during laminar flow is not proportional to the
• Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher?
• Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the
• Crushing efficiency of a machine ranges between __________ percent.
• For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter)
• Tube mill compared to ball mill
• During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration
• Filter medium resistance is that offered by the
• Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the __________ filtration.
• The reduction ratio for grinders is defined as(where, Df and Dp are average diameters of feed and product respectively).
• Fluid energy mill comes in the category of