Mechanical Operations

screw

ratio of surface to volume as the actual volume.

Size enlargement (opposite of size reduction) is not a mechanical operation.

square root of the velocity.

vibrating screen

Humidification

Plate and flame filter.

operate at higher speed.

flint or porcelain

all 'a', 'b'&'c'.

μ ≥ tan α

Both the rolls run necessarily at the same speed.

Toothed roll crusher

terminal velocities in the same fluid & in the same field of force.

Cone type agitator

Suspended batch basket

classification

filter aid

number

is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle.

1/4

non-metallic ores

hard rubber

speed

Hanger

centrifugation

increase the porosity of the cake.

None of these

all (a), (b) and (c).

The equipment used for the removal of traces of solids from a liquid is called a classifier.

hydrocyclone

sulphide ores

18 kWh/ton

Froth floatation

Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products.

0.2 to 0.8

multiple blade paddles

32°

metalliferrous ores

venturi

attrition

all (a), (b) and (c).

separated by particle size.

impact

lead

inch

Diatomaceous earth