Q. __________ mills are termed as impactors.

View solution

Q. In case of a revolving mill, wet grinding compared to dry grinding

View solution

Q. To get a fine talc powder from its granules, the equipment used is

View solution

Q. For a cyclone of diameter 0.2 m with a tangential velocity of 15 m/s at the wall, the separation factor is

View solution

Q. At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied:

P₀ = ρ/ρN³ D⁵ : Power number
Re = ρ N D²/μ: Reynold's number

N is the impeller rotational speed, and D is the impeller diameter.

View solution

Q. Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines ?

View solution

Q. Rittinger's crushing law states that

View solution

Q. Mechanical conveyors which push the material along an endless trough or tube are called scrappers. Which of the following conveying equipments comes under the category of 'scrappers' ?

View solution

Q. Sphericity of pulverised coal is

View solution

Q. In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.

View solution

Q. Separation of materials of the same density based on their sizes by using then-different rates of flow is called

View solution

Q. Molten ammonium nitrate is mixed with ground limestone in fertilizer plant in a

View solution

Q. Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are

View solution

Q. For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as

View solution

Q. Screen capacity is expressed in terms of

View solution

Q. A screen is said to be blinded, when the

View solution

Q. What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls ?

View solution

Q. Percentage of drum submerged in the slurry in case of rotary drum filter is

View solution

Q. Filter medium resistance is that offered by the

View solution

Q. Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the

View solution