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