MECHANICAL OPERATIONS QUIZ

For a non-spherical particle, the sphericity

Is the ratio of volume of a sphere having the same surface area as the particle to the actual volume of the particle

Has the dimension of length

Is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle

Is always less than 1

TRUE ANSWER : ?
YOUR ANSWER : ?

Additives used for promoting the floccula-tion of particles is a/an

Neither A nor B

Electrolyte

Both A & B

Surface active agent

TRUE ANSWER : ?
YOUR ANSWER : ?

The mechanism of size reduction by a hammer mill is by impact and attrition between the

Feed particles

Neither A nor B

Both A & B

Grinding element & the housing

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ is the most suitable for compounding rubber and plastic solids.

Banbery mixer

Pan mixer

Pug mill

Charge can mixer

TRUE ANSWER : ?
YOUR ANSWER : ?

A widely used size reduction equipment for __________ is Bradford breaker.

Coal

Wheat

Iron core

Talc

TRUE ANSWER : ?
YOUR ANSWER : ?

Screw conveyors are

Run at very high rpm

All of these

Suitable for sticky materials

Suitable for highly abrasive materials

TRUE ANSWER : ?
YOUR ANSWER : ?

Energy consumed for crushing one ton of material ranges from __________ kWh.

0.01 to 0.1

2 to 3.5

4 to 5

0.5 to 1.5

TRUE ANSWER : ?
YOUR ANSWER : ?

A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for __________ flow of filtrate.

Incompressible cake and turbulent

Incompressible cake and laminar

Compressible cake and turbulent

Compressible cakes and laminar

TRUE ANSWER : ?
YOUR ANSWER : ?

Limestone is normally crushed in a

Tube mill

Hammer crusher

Ball mill

Roll crusher

TRUE ANSWER : ?
YOUR ANSWER : ?

Coal is finally pulverised to 200 mesh size for burning in boilers by a

Ball mill

Gyratory crusher

Roll crusher

Hammer crusher

TRUE ANSWER : ?
YOUR ANSWER : ?

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