Q. Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill )

View solution

Q. Pick out the wrong statement.

View solution

Q. The distribution given by microscopic analysis of powder is

View solution

Q. Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vₚ = volume of one particle, ρ= density of particles)

View solution

Q. For a non-spherical particle, the sphericity

View solution

Q. In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is

View solution

Q. Ball mills and tube mills with flint or porcelain balls are used for size reduction of

View solution

Q. Jigging is a technique by which different particles can be

View solution

Q. Crushing of mineral particles is accomplished in a 'cage mill', when one or more alloy steel bars are revolved in opposite directions. It is a type of __________ mill.

View solution

Q. Balls for ball mills are never made of

View solution

Q. 200 mesh screen means 200 openings per

View solution

Q. __________ is the most commonly used 'filter aid'.

View solution

Q. Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of

View solution

Q. Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is

View solution

Q. Which of the following relationships between co-efficinet of friction (μ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct ?

View solution

Q. Pick out the wrong statement pertaining to the roll crushers.

View solution

Q. Which of the following is not an ultrafine grinder (colloid mill)?

View solution

Q. In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the

View solution

Q. For sizing of fine materials, the most suitable equipment is a

View solution

Q. Which of the following is not categorised as a "mechanical operation" ?

View solution