Mechanical Operations MCQs

Question 1

Moisture can be removed from lubricating oil using

Accepted Answer

Tubular centrifuge

Answer

Clarifier

Answer

Sparkler filter

Answer

Vacuum leaf filter

Question 2

Bucket elevators are not suitable for the vertical lifting of __________ materials.

Accepted Answer

Sticky (e.g. clay paste)

Answer

Fine (e.g. - 200 mesh size coal)

Answer

Small lumpy (e.g. grains and sand)

Answer

Free flowing

Question 3

Pine oil used in froth floatation technique acts as a/an

Accepted Answer

Frother

Answer

Collector

Answer

Modifier

Answer

Activator

Question 4

Which one is a filter aid?

Accepted Answer

Diatomaceous earth

Answer

Convas fabric

Answer

Calcined lime

Answer

None of these

Question 5

Tube mill compared to ball mill

Accepted Answer

All of the above

Answer

Produces finer products

Answer

Is long in comparison with its diameter

Answer

Uses smaller balls

Question 6

Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines?

Accepted Answer

Rod mill

Answer

Compartment mill

Answer

Pebble mill

Answer

Tube mill

Question 7

For the transportation of ultrafine particles, the equipment used is a........conveyor.

Accepted Answer

Pneumatic

Answer

Belt

Answer

Screw

Answer

None of these

Question 8

During the washing of cake

Accepted Answer

All the resistances are constant

Answer

Filter medium resistance increases

Answer

Filter medium resistance decreases

Answer

Cake resistance decreases

Question 9

Fibrous material is broken by a

Accepted Answer

Squirrel-cage disintegrator

Answer

Rollcrusher

Answer

Ball mill

Answer

Tube mill