Stamp mills are generally used for crushing

Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.

A

Metalliferrous ores

B

Non-metallic ores

C

Basic slags

D

Asbestos & mica

Gravity stamp mill is meant for the __________ crushing.

A

Primary

B

Intermediate

C

Fine

D

Ultrafine

Ball mills and tube mills with flint or porcelain balls are used for size reduction of

A

Asbestos

B

Rubber

C

Non-metallic ores

D

Limestone

__________ mills fall in the category of tumbling mills,

A

Ball and pebble

B

Rod and tube

C

Compartment

D

All of the above

What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?

A

16°

B

32°

C

40°

D

46°

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

A

Results in increased capacity

B

Consumes less power

C

Consumes more power

D

Both A and C

For crushing of solids, the Rittinger's law states that the work required for crushing is proportional to

A

The new surface created

B

The size reduction ratio

C

The change in volume due to crushing

D

None of these

Which of the following pictures was depicted in the first postage stamp of Bangladesh after the Liberation war in 1971?

A

Water Lilly flower

B

Jackfruit

C

Royal Bangal Tiger

D

Martyr Monument

In Sajib's collection, Bangladeshi stamp is 3 times more than the stamps of other countries . Which of the following cannot be the number of stamps in Sajib's collection ?

A

96

B

72

C

54

D

32

Which one of the five is least like the other? STAMP-PEN-ENVELOPE-BOOK-MAIL

A

Pen

B

Book

C

Mail

D

None of these

Stamp mills are generally used for crushing

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