Q. Which of the following comes in the category of primary crusher for hard and tough stone ?

View solution

Q. Crushing efficiency of a machine ranges between __________ percent.

View solution

Q. __________ conveyors are also called scrapers.

View solution

Q. For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid ?

View solution

Q. Which of the following is a continuous filter?

View solution

Q. During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration

View solution

Q. In screen analysis, the notation +5 mm/-10 mm means particles passing through

View solution

Q. Solid particles of different densities are separated by

View solution

Q. During agitation of liquids, power consumption during laminar flow is not proportional to the

View solution

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