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Mechanical Operations

Mechanical Operations
Which of the following is not a non-metalliferous mineral?

Calcite
Quartz
Fluorspar
Cassiterrite

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Mechanical Operations
Sauter mean diameter is the same as the __________ mean diameter.

Geometric
Volume-surface
Arithmetic
Mass

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Mechanical Operations
Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively.

1000°C and 10 atm
500°C and 50 atm
1000°C and 500 atm
200°C and 5 atm

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Mechanical Operations
Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is

0.5
1
√3
√2

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Mechanical Operations
Hot, lumpy & abrasive materials are best transported by using a/an __________ conveyor.

Apron
Belt
Screw
Flight

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Mechanical Operations
In closed circuit grinding as compared to open circuit grinding, the

Specific surface of product is more
Production rate at a given limiting size is lower
Product has lesser size uniformity
Operation is economical

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