MECHANICAL OPERATIONS QUIZ

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

Modifier

Collector

Activator

Frother

TRUE ANSWER : ?
YOUR ANSWER : ?

Crushing efficiency is the ratio of the

Energy absorbed by the solid to that fed to the machine

Energy absorbed by the solid to the surface energy created by crushing

Energy fed to the machine to the surface energy created by crushing

Surface energy created by crushing to the energy absorbed by the solid

TRUE ANSWER : ?
YOUR ANSWER : ?

For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as

Np ∝ √NRe

Np ∝ 1/NRe

Np ∝ NRe

Np → constant

TRUE ANSWER : ?
YOUR ANSWER : ?

The process opposite to 'dispersion' is termed as the

Sedimentation

None of these

Filtration

Flocculation

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not used as a filter medium in case of corrosive liquids?

Nylon

Metal cloth of monel or stainless steel

Cotton fabric

Glass cloth

TRUE ANSWER : ?
YOUR ANSWER : ?

Power consumption during turbulent flow in agitation tank is proportional to the __________ of the liquid.

Surface tension

Thermal conductivity

Density

Viscosity

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YOUR ANSWER : ?

Which of the following oxides is not present in hematite iron ore?

Titanium oxide

Cobalt oxide

Manganese oxide

Calcium oxide

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following may prove unsuitable for filtering volatile liquids?

Pressure filter

Centrifugal filter

Vacuum filter

Gravity filter

TRUE ANSWER : ?
YOUR ANSWER : ?

Froth floatation is the most suitable for treating

None of these

Sulphide ores

Iron ores

Quartzite

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following size reduction equipments employs mainly attrition for ultrafine grinding?

Micronizer

Jet mills

All of these

Fluid energy mill

TRUE ANSWER : ?
YOUR ANSWER : ?