A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is

Mechanical Operations
A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is

0.5

0.62

0.68

0.58

0.5

0.62

0.68

0.58

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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 high viscous suspension

Wet grinding in low viscous suspension

Dry grinding of large particles (upto 1.25 cms)

Dry grindng of large particles in un-baffed mills

Wet grinding in high viscous suspension

Wet grinding in low viscous suspension

Dry grinding of large particles (upto 1.25 cms)

Dry grindng of large particles in un-baffed mills

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Mechanical Operations
Which of the following is not a cutting machine?

Slitters

Tube mills

Knife cutters

Dicers

Slitters

Tube mills

Knife cutters

Dicers

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Mechanical Operations
Screw conveyors are

Suitable for highly abrasive materials

Suitable for sticky materials

All of these

Run at very high rpm

Suitable for highly abrasive materials

Suitable for sticky materials

All of these

Run at very high rpm

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Mechanical Operations
Which one is a filter aid?

Diatomaceous earth

Calcined lime

None of these

Convas fabric

Diatomaceous earth

Calcined lime

None of these

Convas fabric

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Mechanical Operations
In classification, particles are said to be equal settling, if they have the same terminal velocities in the

Same field of force

Both B and C

Different fluids

Same fluid

Same field of force

Both B and C

Different fluids

Same fluid

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Mechanical Operations

Mechanical Operations A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is

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 Which of the following is not a cutting machine?

Mechanical Operations Screw conveyors are

Mechanical Operations Which one is a filter aid?

Mechanical Operations In classification, particles are said to be equal settling, if they have the same terminal velocities in the

Mechanical Operations
A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is

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
Which of the following is not a cutting machine?

Mechanical Operations
Screw conveyors are

Mechanical Operations
Which one is a filter aid?

Mechanical Operations
In classification, particles are said to be equal settling, if they have the same terminal velocities in the