The sphericity of a cylinder of 1 mm diameter and length 3 mm is

According to Bond crushing law, the work required to form particle of size 'D' from very large feed is (where (S/V)_p and (S/V)_f are surface to volume ratio of the product and feed respectively).

A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol ismm/s. If the Richardson-Zaki hindered settling index is 4.the volume fraction of solids in the suspension is

According to Taggart's rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than

Pick out the wrong statement.

Ultra centrifuges are used for the separation of __________ solid particles.

Gold ore concentration is mostly done using

The speed of a rotary drum vacuum filter may be about __________ rpm.

Pulverised coal passing throughmesh screen has a diameter of 0.mm (micron). The same passing throughmesh screen will have a dia of __________ mm.

Which of the following gives the work required for size reduction of coal to -mesh in a ball mill most accurately ?

__________ conveyor is the most suitable for long distance transportation of cold, non-abrasive granular/irregular shape/fine materials.

Which of the following represents the plot of filtrate volume versus time for constant pressure filtration ?

Addition of filter aid to the slurry before filtration is done to ...... of the cake.

Which of the following terminology is not used for size reduction of materials to fine sizes or powders?

Specific surface area is the surface area of a unit __________ of materials.

A. __________ mill is a revolving mill divided into two or more sections by perforated partitions in which preliminary grinding takes place at one end and the finishing grinding at the discharge end.

Mixing of light fine powder such as insecticides is done by

Colloid mills achieve size reduction mainly by

What is the selectivity index, if the grade of tailings & concentrate is the same ?

Electrical energy consumed by a jaw crusher is not a function of the

The unit of specific cake resistance is

The specific cake resistance for compressible sludges is a function of the pressure drop

Out of the following size reduction equipments, the maximum feed size can be accepted by the

Driving force in case of filtration by a centrifuge is the

A tube mill as compared to a ball mill

The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond's law, Rittinger's law and Kick's law) depend upon the

Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens.

Mesh indicates the number of holes per

The most suitable equipment used to devulcanise rubber scrap and to make water dispersion & rubber solution is a

Size reduction mechanism used in Jaw crushers is

Size reduction of asbestos and mica is done by

Moisture can be removed from lubricating oil using

Bucket elevators are not suitable for the vertical lifting of __________ materials.

Rod mills employed for grinding

Kick's law assumes that the energy required for size reduction is proportional to the logarithm of the ratio between the initial and the final diameters. The unit of Kick's constant is

Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity ?

For achieving maximum capacity of the ball mill, the ball charge should be equal to about __________ percent of the ball mill volume.

Traces of solids are removed from, liquid in a

Trommels employ __________ for screening of materials.

A pebble mill

The study on washability of coal is done by using the __________ technique.

Tabling process used for separating two materials of different densities by passing the dilute pulp over a table/deck, which is inclined from the horizontal surface at an angle of about

The most common filter aid is

For removal of very small amounts of precipitate from large volume of water, the most suitable filter is the __________ filter.

Horsepower required for a roll crusher is directly proportional to its

For separation of sugar solution from settled out mud, we use a __________ filter.

Maximum size reduction in a ball mill is done by the, __________ action.

Length/diameter ratio of a ball mill is

increasing the capacity of a screen __________ the screen effectiveness.

Feed size of ≥cms can be accepted by