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Mechanical Operations

Mechanical Operations
Cement clinker is reduced to fine size by a

Hammer mill
Tube mill
Roll crusher
Ball mill

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Mechanical Operations
With increase in drum speed, in a rotary drum filter, the filtration rate

Increases linearly
Is not affected
Decreases
Increases

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Mechanical Operations
A widely used size reduction equipment for __________ is Bradford breaker.

Coal
Talc
Iron core
Wheat

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Mechanical Operations
In the cyclone separator used for separation of dust from dust laden gas, the gas

Enters the cyclone from the top
Develops a helical motion inside the chamber
Is admitted tangentially at high velocity
Both B and C

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Mechanical Operations
The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 μrn is

6.35 kWh/ton
25.4 kWh/ton
18 kWh/ton
9.0 kWh/ton

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Mechanical Operations
The study on washability of coal is done by using the __________ technique.

Elutriation
Heavy media separation
None of these
Tabling

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