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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
0.5 Wi
Wi
1.34 Wi
3.34 Wi
__________ mill is not a revolving mill
Pebble
Cage
Compartment
tube
__________ mean diameter of particles is given by
mass
Volume
Volume surface
Arithmetic
In case of grinding in a ball mill
grinding cost and power requirement increases with increasing fineness of the products.
its capacity decreases with increasing fineness of the products.
wet grinding achieves a finer product size than dry grinding.
all (a), (b) and (c).
Dry powdery solid materials are transported by a __________ conveyor
Belt
Bucket
NONE OF THESE
Screw
Separation of materials into products based on the difference of their sizes is called
Sorting
Flocculation
Classification
sizing
Jigging is a technique by which different particles can be
separated by particle size.
separated by particle shape.
separated by particle density.
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 )
1/μ2
1/μ
μ
The optimum moisture content in solids to be crushed/ground ranges from __________ percent
15 to 20
10 to 15
8 to 10
3 to 4
Pine oil used in froth floatation technique acts as a/an
Activator
Collector
frother
Modifier
To get ultrafine particles, the equipment used is a
Rod mill
ball mill
hammer crusher
fluid energy mill
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 less than the critical speed.
at a speed more than the critical speed.
at a speed equal to the critical speed.
with minimum possible small balls.
In case of a hammer crusher,
crushing takes place by impact breaking.
reduction ratio can be varied by adjusting the distance from cage to hammers.
maximum acceptable feed size is 30 cms.
all (a), (b) and (c).
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
toothed roll
None of these.
gyratory
Blake jaw
Which of the following is a batch sedimentation equipment
Filter thickener
Rotary sprayer scrubber.
Dry cyclone separator
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
1
NONE OF THESE
2
Fluid energy mill comes in the category of
crusher
grinder
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
Compartment
pebble.
tube
rod
1
2
11
22
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