MECHANICAL OPERATIONS QUIZ

In filtration, the use of 'filter aid' helps in

Accelerating the rate of filtration

Reducing the filtration pressure

Enhancing the cake porosity in case of a dense impermeable cake

Deplugging the filter medium

TRUE ANSWER : ?
YOUR ANSWER : ?

The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle).

12/D.p

2/D.p

4/D.p

6/D.p

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is used for primary crushing of very hard lumpy materials?

Ball mill

Toothed roll crusher

Tube mill

Gyratory crusher

TRUE ANSWER : ?
YOUR ANSWER : ?

Colloidal mills are used for __________ grinding.

Coarse

Intermediate

Fine

Ultrafine

TRUE ANSWER : ?
YOUR ANSWER : ?

Diatomaceous earth is a/an

Filter aid

Explosive

Catalyst

Filter medium

TRUE ANSWER : ?
YOUR ANSWER : ?

Electrical energy consumed by a jaw crusher is not a function of the

Average product size

Machine capacity

Average feed size

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

A pebble mill

Is a ball mill

Both B and C

Employs flints or ceramic pebbles as the grinding medium

Is a tube mill lined with ceramic or other non-metallic liner

TRUE ANSWER : ?
YOUR ANSWER : ?

Shape factor for a cylinder whose length equals its diameter is

1.0

1.5

0.5

2.0

TRUE ANSWER : ?
YOUR ANSWER : ?

Gravity settling process is not involved in the working of a

Dorr-thickener

Sedimentation tank

Hydrocyclone

Classifier

TRUE ANSWER : ?
YOUR ANSWER : ?

Ultrafine grinders operate principally by

Slow compression

Impact

Cutting action

Attrition

TRUE ANSWER : ?
YOUR ANSWER : ?