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