Trommels are revolving screens which normally operate in the range of __________ rpm.

Trommels employ __________ for screening of materials.

A

Fibrous cloth

B

Woven wire screen

C

Punched plate

D

None of these

Trommels separate a mixture of particles depending on their

A

Size

B

Density

C

Wettability

D

Electrical & magnetic properties

Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____.

A

3, 3, 1, 7

B

3, 2, 1, none

C

3, 2, 1, 7

D

3, 3, 2, none

E

All of the above

Speed of the drum of the rotary vacuum filter normally ranges from __________ rpm.

A

0.1 to 2

B

5 to 7

C

3 to 8

D

8 to 15

A. __________ mill is a revolving mill divided into two or more sections by perforated partitions in which preliminary grinding takes place at one end and the finishing grinding at the discharge end.

A

Compartment

B

Tube

C

Rod

D

Pebble

__________ mill is not a revolving mill.

A

Pebble

B

Compartment

C

Cage

D

Tube

Wet grinding in a revolving mill __________ as compared to dry grinding.

A

Gives less wear on chamber walls

B

Requires more energy

C

Increases capacity

D

Complicates handling of the product

Frame thickness in the plate and frame filter press is normally in the range of __________ inches.

A

0.25 to 4

B

0.25 to 8

C

1 to 5

D

1 to 12

Commercial packed scrubbers are normally designed for a pressure drop range of __________ mm water coloumn per metre of packed height.

A

4-8

B

17-34

C

52-68

D

88-105

The general range of speed in revolutions per minute (rpm) at which floppy disks rotate is

A

2400-4700

B

390-600

C

150-250

D

300-600

E

None of the above

Trommels are revolving screens which normally operate in the range of __________ rpm.

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