A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index is 4.5, the volume fraction of solids in the suspension is

Mechanical Operations
A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index is 4.5, the volume fraction of solids in the suspension is

0.6

0.1

None of these

0.4

0.6

0.1

None of these

0.4

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Mechanical Operations
Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __________ mm.

0.3

0.007

50

0.014

0.3

0.007

50

0.014

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Mechanical Operations
A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 μm/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is

0.90 μm/s

22.1 μm/s

1 μm/s

0.02 μm/s

0.90 μm/s

22.1 μm/s

1 μm/s

0.02 μm/s

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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. ρ

3.6 W.Dr.ρ

3.6 V.W.Dr/ρ

3.6 V.W.Dr.ρ

3.6 V.W. ρ

3.6 W.Dr.ρ

3.6 V.W.Dr/ρ

3.6 V.W.Dr.ρ

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Mechanical Operations
Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately ?

None of these

Kick's law

Rittinger's law

Bond's law

None of these

Kick's law

Rittinger's law

Bond's law

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Mechanical Operations
Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for

American standard screens (ASTM and Tyler standard screens)

All of these

British standard screens

German standard screens (DIN 1171) etc

American standard screens (ASTM and Tyler standard screens)

All of these

British standard screens

German standard screens (DIN 1171) etc

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Mechanical Operations

Mechanical Operations Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __________ mm.

Mechanical Operations A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 μm/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is

Mechanical Operations Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately ?

Mechanical Operations Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for

Mechanical Operations
Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __________ mm.

Mechanical Operations
A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 μm/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is

Mechanical Operations
Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately ?

Mechanical Operations
Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for