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Mechanical Operations

Mechanical Operations
Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor.

Ribbon
Flight
Screw
Slat or drag

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Mechanical Operations
To produce talcum powder, use

Ball mill
Hammer mill
Jet mill
Pin mill

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Mechanical Operations
A tube mill as compared to a ball mill

Has larger length/diameter ratio (>2 as compared to 1 for ball mill)
All of these
Gives finer size reduction but consumes more power
Employs smaller balls

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Mechanical Operations
The most efficient equipment for the removal of sub-micronic dust particles from blast furnace gas is the

Cyclone separator
Gravity settling chamber
Venturi atomiser
Electro-static precipitator

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Mechanical Operations
For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter)

AD/V
π/6(=V/D³)
None of these
π(=A/D²)

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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

1 μm/s
0.90 μm/s
0.02 μm/s
22.1 μm/s

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