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Mechanical Operations

Mechanical Operations
In froth floatation, chemical agent added to cause air adherence is called

Frother
Activator
Modifier
Collector

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Mechanical Operations
A propeller agitator

All of these
Produces mainly axial flow
Is used for mixing high viscosity pastes
Runs at very slow speed (2 rpm)

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Mechanical Operations
Moisture can be removed from lubricating oil using

Sparkler filter
Clarifier
Tubular centrifuge
Vacuum leaf filter

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Mechanical Operations
Driving force in case of filtration by a centrifuge is the

Formation of highly porous cake
Narrow diameter of the vessel
Centrifugal pressure exerted by the liquid
Speed of the centrifuge

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

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

None of these
Elutriation
Heavy media separation
Tabling

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