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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
tube
Compartment
Cage
Pebble
__________ 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.
all (a), (b) and (c).
its capacity decreases 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
Bucket
Screw
NONE OF THESE
Separation of materials into products based on the difference of their sizes is called
Classification
sizing
Sorting
Flocculation
Jigging is a technique by which different particles can be
separated by particle size.
separated by particle density.
mixed.
separated by particle shape.
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/μ
μ
1/μ2
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
frother
Collector
Modifier
To get ultrafine particles, the equipment used is a
Rod mill
hammer crusher
fluid energy mill
ball mill
The process by which fine solids is removed from liquids is termed as
Classification
Sedimentation
decantation
Flocculation
For efficient grinding, ball mills must be operated
at a speed more than the critical speed.
with minimum possible small balls.
at a speed less than the critical speed.
at a speed equal to the critical speed.
In case of a hammer crusher,
all (a), (b) and (c).
maximum acceptable feed size is 30 cms.
reduction ratio can be varied by adjusting the distance from cage to hammers.
crushing takes place by impact breaking.
In case of a hammer crusher, the
feed may be highly abrasive (Moh's scale >5).
minimum product size is 3 mm.
maximum feed size may be 50 mm.
rotor shaft carrying hammers can be vertical or horizontal.
Size reduction of ice and gypsum can be accomplished suitably by a __________ crusher
toothed roll
Blake jaw
gyratory
None of these.
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
2
1
NONE OF THESE
1.5
Fluid energy mill comes in the category of
ultrafine grinder
cutter
crusher
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
pebble.
tube
Compartment
rod
1
2
11
22
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