Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the

Mechanical Operations
Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the

Ultimate strength of the material

Elastic constant of the material

All of these

State or manner of application of the crushing force

Ultimate strength of the material

Elastic constant of the material

All of these

State or manner of application of the crushing force

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Mechanical Operations
Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed?

Wet grinding in low viscous suspension

Dry grindng of large particles in un-baffed mills

Wet grinding in high viscous suspension

Dry grinding of large particles (upto 1.25 cms)

Wet grinding in low viscous suspension

Dry grindng of large particles in un-baffed mills

Wet grinding in high viscous suspension

Dry grinding of large particles (upto 1.25 cms)

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Mechanical Operations
Energy requirement (per unit mass of material crushed/ground) is highest for

Ball mill

Rod mill

Fluid energy mill

Jaw crusher

Ball mill

Rod mill

Fluid energy mill

Jaw crusher

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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 V.W.Dr.ρ

3.6 V.W.Dr/ρ

3.6 W.Dr.ρ

3.6 V.W. ρ

3.6 V.W.Dr.ρ

3.6 V.W.Dr/ρ

3.6 W.Dr.ρ

3.6 V.W. ρ

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Mechanical Operations
In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of __________ crushing.

Ultrafine

Fine

Primary

Secondary

Ultrafine

Fine

Primary

Secondary

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Mechanical Operations
Which of the following must be stored in silos and not in open yard?

High V.M. bituminous coal

None of these

Sand

Coke breeze

High V.M. bituminous coal

None of these

Sand

Coke breeze

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Mechanical Operations

Mechanical Operations Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the

Mechanical Operations Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed?

Mechanical Operations Energy requirement (per unit mass of material crushed/ground) is highest for

Mechanical Operations In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of __________ crushing.

Mechanical Operations Which of the following must be stored in silos and not in open yard?

Mechanical Operations
Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the

Mechanical Operations
Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed?

Mechanical Operations
Energy requirement (per unit mass of material crushed/ground) is highest for

Mechanical Operations
In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of __________ crushing.

Mechanical Operations
Which of the following must be stored in silos and not in open yard?