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Mechanical Operations

Mechanical Operations
Optimum ratio of operating speed to critical speed of a trommel is

0.33-0.45
1.33-1.45
1.5-2.5
0.5-2

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Mechanical Operations
Moore filter is a __________ filter.

Press
Rotary
Sand
Leaf

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

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

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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
For achieving maximum capacity of the ball mill, the ball charge should be equal to about __________ percent of the ball mill volume.

75
25
10
50

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Mechanical Operations
The critical speed of a trommel (N) is related to its dia (D) as

N ∝ 1/√D
N ∝ D
N ∝ 1/D
N ∝ √D

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