General mechanism of size reduction in intermediate and fine grinder is by

In grinding irregular, curved, tapered, convex and concave surfaces, the grinder used is

A

Cylindrical grinder

B

Internal grinder

C

Surface grinder

D

Tool and cutter grinder

Which of the following is not an ultrafine grinder (colloid mill)?

A

Micronizers

B

Agitated mills and fluid energy mills

C

Toothed roll crusher

D

Hammer mills with internal classification

Which of the following terminology is not used for size reduction of materials to fine sizes or powders?

A

Comminution

B

Dispersion

C

Pulverisation

D

Compression

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

A

Grinding element & the housing

B

Feed particles

C

Both A & B

D

Neither A nor B

Size reduction mechanism used in Jaw crushers is

A

Attrition

B

Compression

C

Cutting

D

Impact

Melt spinning of polymers involves the forcing of polymer melt through spinnerettes (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the __________ fibres.

A

Acrylic

B

Polyester

C

Nylon 6:6

D

Polypropylene

Out of the following size reduction equipments, the maximum feed size can be accepted by the

A

Tube mill

B

Ball mill

C

Jaw crusher

D

Jet pulveriser

Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.

A

Jaw crusher, Ball mill, Fluid energy mill

B

Ball mill, Jaw crusher, Fluid energy mill

C

Fluid energy mill, Jaw crusher, Ball mill

D

Fluid energy mill, Ball mill, Jaw crusher

The reduction ratio for fine grinders is

A

5-10

B

10-20

C

20-40

D

As high as 100

A reduction of 15% in the price of a shirt resulted in the reduction of the price of the shirt by Tk 21. What was the previous price of the shirt?

A

Tk. 175

B

Tk. 140

C

Tk. 150

D

Tk. 120

General mechanism of size reduction in intermediate and fine grinder is by

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