Mechanical Operations

The study on washability of coal is done by using the _____________ technique?

Byadmin February 18, 2019August 22, 2021

The study on washability of coal is done by using the _____________ technique?

A. Tabling
B. Elutriation
C. Heavy media separation
D. None of these

Mechanical Operations

Paddle agitator_________________?

Paddle agitator_________________?

A. Is suitable for mixing low viscosity liquids
B. Produces axial flow
C. Moves at very high speed
D. None of these

Read More Paddle agitator_________________?
Mechanical Operations

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) ?

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. (S/V)p
B. √(S/V)p
C. (S/V)2p
D. (S/V)f

Read More 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) ?
Mechanical Operations

Size reduction of the ______________ can be suitably done by ball mills, crushing rolls and rod mills?

Size reduction of the ______________ can be suitably done by ball mills, crushing rolls and rod mills?

A. Metalliferous ores
B. Non-metallic ores
C. Basic slags
D. Asbestos & mica

Read More Size reduction of the ______________ can be suitably done by ball mills, crushing rolls and rod mills?
Mechanical Operations

Maximum size reduction in a fluid energy mill is achieved by___________________?

Maximum size reduction in a fluid energy mill is achieved by___________________?

A. Compression
B. Interparticle attrition
C. Cutting
D. Impact

Read More Maximum size reduction in a fluid energy mill is achieved by___________________?
Mechanical Operations

Half the angle of nip, (α), for a roll crusher is given by (where, dr, dp and df are diameters of crushing rolls, feed particles and rolls gap respectively) ?

Half the angle of nip, (α), for a roll crusher is given by (where, dr, dp and df are diameters of crushing rolls, feed particles and rolls gap respectively) ?

A. cos α = (dr + dp)/(dr + df)
B. cos α = (dr + df)/(dr + dp)
C. tan α = (dr + dp)/(dr + df)
D. sin α = (dr + dp)/(dr + df)

Read More Half the angle of nip, (α), for a roll crusher is given by (where, dr, dp and df are diameters of crushing rolls, feed particles and rolls gap respectively) ?
Mechanical Operations

_______________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals?

_______________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals?

A. Separation efficiency
B. Selectivity index
C. Concentration ratio
D. None of these

Read More _______________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals?

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