Mechanical Operations

Which of the following is used for primary crushing of very hard lumpy materials ?

Byadmin February 18, 2019August 22, 2021

Which of the following is used for primary crushing of very hard lumpy materials ?

A. Toothed roll crusher
B. Gyratory crusher
C. Ball mill
D. Tube mill

Mechanical Operations

Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ρ = bulk density of material, kg/m3) ?

Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ρ = bulk density of material, kg/m3) ?

A. 3.6 W.D.V.ρ
B. 3.6 W.D.V
C. 3.6 W.V.ρ
D. 3.6 D.V.ρ

Read More Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ρ = bulk density of material, kg/m3) ?
Mechanical Operations

For benefication of iron ore, the most commonly used method is______________?

For benefication of iron ore, the most commonly used method is______________?

A. Flocculation
B. Froth floatation
C. Jigging & tabling
D. None of these

Read More For benefication of iron ore, the most commonly used method is______________?
Mechanical Operations

Which of the following is not an industrial screening equipment ?

Which of the following is not an industrial screening equipment ?

A. Sharpies centrifuge
B. Vibrating screen
C. Grizzly
D. Trommel

Read More Which of the following is not an industrial screening equipment ?
Mechanical Operations

Rod mills employed for grinding_________________?

Rod mills employed for grinding_________________?

A. Employ a steel shell having L/D ratio of 1.5 to 3.0
B. Is useful for handling sticky materials
C. Employ steel rods of 2-12 cms diameter extending over full length of the mill
D. All A , B & C

Read More Rod mills employed for grinding_________________?
Mechanical Operations

There is practically no alternative/competitor to _________________ in the beneficiation treatment of sulphide ores?

There is practically no alternative/competitor to _________________ in the beneficiation treatment of sulphide ores?

A. Classification
B. Tabling
C. Jigging
D. Froth floatation

Read More There is practically no alternative/competitor to _________________ in the beneficiation treatment of sulphide ores?
Mechanical Operations

The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be _______________ cms?

The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be _______________ cms?

A. 20
B. 12
C. 8
D. 2

Read More The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be _______________ cms?

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