Q. Trommels are revolving screens which normally operate in the range of __________ rpm.

View solution

Q. 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

View solution

Q. Maximum size reduction in a fluid energy mill is achieved by

View solution

Q. With increase in the capacity of screens, the screen effectiveness

View solution

Q. As particle size is reduced

View solution

Q. Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the

View solution

Q. 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.

View solution

Q. For efficient grinding, ball mills must be operated

View solution

Q. In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of __________ crushing.

View solution

Q. For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter)

View solution

Q. The reduction ratio for grinders is defined as(where, Df and Dp are average diameters of feed and product respectively).

View solution

Q. Pick out the wrong statement pertaining to the turbine agitator.

View solution

Q. A fluid energy mill is used for

View solution

Q. Which of the following is the softest material ?

View solution

Q. Dry powdery solid materials are transported by a __________ conveyor.

View solution

Q. Fluid energy mill comes in the category of

View solution

Q. Filtration capacity of a rotary drum vacuum filter depends upon the

View solution

Q. Optimum ratio of operating speed to critical speed of a trommel is

View solution

Q. The process opposite to 'dispersion' is termed as the

View solution

Q. The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant __________ filtration.

View solution