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Mechanical Operations

Mechanical Operations
Energy consumed for crushing one ton of material ranges from __________ kWh.

0.5 to 1.5
4 to 5
0.01 to 0.1
2 to 3.5

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Mechanical Operations
Two particles are called to be equal settling, if they are having the same.

Specific gravity
Size
None of these
Terminal velocities in the same fluid & in the same field of force

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Mechanical Operations
Weber number is significant and is concerned with the

Dispersion of liquid in liquid
Solid-liquid mixing
Suspension of solid in liquid
Liquid-liquid mixing

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Mechanical Operations
Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripherial velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m³ here, V =πN.D where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m)

3.6 W.Dr.ρ
3.6 V.W. ρ
3.6 V.W.Dr.ρ
3.6 V.W.Dr/ρ

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Mechanical Operations
Which of the following screens has the maximum capacity?

Vibrating screen
Trommels
Grizzlies
Shaking screen

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Mechanical Operations
For the preliminary breaking of hard rock, we use a

Ball mill
Tube mill
Squirrel-cage disintegrator
Gyratory crusher

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