MECHANICAL OPERATIONS QUIZ

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

Banbery mixer

Pan mixer

Charge can mixer

Pug mill

TRUE ANSWER : ?
YOUR ANSWER : ?

Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed?

Dry grinding of large particles (upto 1.25 cms)

Dry grindng of large particles in un-baffed mills

Wet grinding in low viscous suspension

Wet grinding in high viscous suspension

TRUE ANSWER : ?
YOUR ANSWER : ?

Use of baffles in agitators help in minimising the __________ tendency.

Neither A nor B

Vortexing

Swirling

Both A & B

TRUE ANSWER : ?
YOUR ANSWER : ?

Gold ore concentration is mostly done using

Froth floatation

Elutriation

Jigging

Tabling

TRUE ANSWER : ?
YOUR ANSWER : ?

Choke crushing (in case of a Jaw crusher) compared to free crushing

Consumes less power

Results in increased capacity

Both A and C

Consumes more power

TRUE ANSWER : ?
YOUR ANSWER : ?

Size reduction of moulding powders, waxes, resins & gums are done in a __________ mill.

Neither A nor B

Cage

Both A & B

Hammer

TRUE ANSWER : ?
YOUR ANSWER : ?

Balls for ball mills are never made of

Alloy steel

Forged/cast steel

Lead

Cast iron

TRUE ANSWER : ?
YOUR ANSWER : ?

A filter press is

Having prohibitively high maintenance cost

Not suitable, if the liquid is the main product

A batch filter

Not suitable for wide range of materials under varying operating conditions of cake thickness and pressure

TRUE ANSWER : ?
YOUR ANSWER : ?

Feed size of ≥ 25 cms can be accepted by

Fluid energy mill

Jaw crusher

Rod mill

Ball mill

TRUE ANSWER : ?
YOUR ANSWER : ?

Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is

0.01 to 0.1

0.2 to 0.4

0.2 to 0.8

0.1 to 0.3

TRUE ANSWER : ?
YOUR ANSWER : ?

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