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The value of work index does not change materially from one equipment toanother.
If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be
Wi
3.34 Wi
0.5 Wi
1.34 Wi
__________ mill is not a revolving mill
tube
Compartment
Pebble
Cage
__________ mean diameter of particles is given by
Volume
mass
Arithmetic
Volume surface
In case of grinding in a ball mill
all (a), (b) and (c).
wet grinding achieves a finer product size than dry grinding.
its capacity decreases with increasing fineness of the products.
grinding cost and power requirement increases with increasing fineness of the products.
Dry powdery solid materials are transported by a __________ conveyor
Belt
Screw
NONE OF THESE
Bucket
Separation of materials into products based on the difference of their sizes is called
Classification
Sorting
Flocculation
sizing
Jigging is a technique by which different particles can be
separated by particle density.
separated by particle size.
separated by particle shape.
mixed.
Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc) is proportional to __________ and the cycle time (where, μ = filtrate viscosity Rm = filter medium resistance Rc = cake resistance )
μ
1/μ
1/μ2
The optimum moisture content in solids to be crushed/ground ranges from __________ percent
10 to 15
3 to 4
8 to 10
15 to 20
Pine oil used in froth floatation technique acts as a/an
Collector
Modifier
Activator
frother
To get ultrafine particles, the equipment used is a
Rod mill
hammer crusher
ball mill
fluid energy mill
The process by which fine solids is removed from liquids is termed as
Sedimentation
decantation
Classification
Flocculation
For efficient grinding, ball mills must be operated
at a speed less than the critical speed.
at a speed more than the critical speed.
with minimum possible small balls.
at a speed equal to the critical speed.
In case of a hammer crusher,
crushing takes place by impact breaking.
all (a), (b) and (c).
reduction ratio can be varied by adjusting the distance from cage to hammers.
maximum acceptable feed size is 30 cms.
In case of a hammer crusher, the
feed may be highly abrasive (Moh's scale >5).
maximum feed size may be 50 mm.
minimum product size is 3 mm.
rotor shaft carrying hammers can be vertical or horizontal.
Size reduction of ice and gypsum can be accomplished suitably by a __________ crusher
Blake jaw
toothed roll
gyratory
None of these.
Which of the following is a batch sedimentation equipment
Filter thickener
Dry cyclone separator
Rotary sprayer scrubber.
dust catcher
The ratio of the area of openings in one screen (Taylor series) to that of the openings in the next smaller screen is
1.5
NONE OF THESE
1
2
Fluid energy mill comes in the category of
grinder
crusher
ultrafine grinder
cutter
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
pebble.
Compartment
rod
tube
1
2
11
22
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