MECHANICAL OPERATIONS QUIZ

Traces of liquid tar fog present in coke oven gas is separated using

Electrostatic precipitator

None of these

Cyclone separator

Strainer

TRUE ANSWER : ?
YOUR ANSWER : ?

Sedimentation on commercial scale occurs in

Classifiers

Thickeners

Rotary drum filters

Cyclones

TRUE ANSWER : ?
YOUR ANSWER : ?

With increase in the capacity of screens, the screen effectiveness

Increases

Remains unchanged

Decreases

Decreases exponentially

TRUE ANSWER : ?
YOUR ANSWER : ?

The inlet pressure in a constant rate filtration

None of these

Increases continuously

Remains constant

Decreases gradually

TRUE ANSWER : ?
YOUR ANSWER : ?

Temperature of the product during ultrafine grinding

Remains constant

Decreases

Increases

May increase or decrease ; depends on the material being ground

TRUE ANSWER : ?
YOUR ANSWER : ?

A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is

0.58

0.68

0.5

0.62

TRUE ANSWER : ?
YOUR ANSWER : ?

Maximum size reduction in a ball mill is done by the, __________ action.

Attrition

Impact

Compression

Cutting

TRUE ANSWER : ?
YOUR ANSWER : ?

Fibrous material is broken by a

Squirrel-cage disintegrator

Rollcrusher

Ball mill

Tube mill

TRUE ANSWER : ?
YOUR ANSWER : ?

What is the selectivity index, if the grade of tailings & concentrate is the same?

∞

0.5

1

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ conveyors are also called scrapers.

Helical flight

Both B & C

Screw

Apron

TRUE ANSWER : ?
YOUR ANSWER : ?

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