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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
0.5 Wi
1.34 Wi
Wi
__________ mill is not a revolving mill
Pebble
Cage
Compartment
tube
__________ mean diameter of particles is given by
Volume surface
Arithmetic
mass
Volume
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
Screw
NONE OF THESE
Bucket
Belt
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 shape.
separated by particle size.
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/μ
μ
1/μ2
The optimum moisture content in solids to be crushed/ground ranges from __________ percent
3 to 4
15 to 20
8 to 10
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
hammer crusher
ball mill
fluid energy mill
Rod mill
The process by which fine solids is removed from liquids is termed as
Flocculation
decantation
Sedimentation
Classification
For efficient grinding, ball mills must be operated
at a speed equal to the critical speed.
at a speed less than the critical speed.
at a speed more than the critical speed.
with minimum possible small balls.
In case of a hammer crusher,
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.
crushing takes place by impact breaking.
In case of a hammer crusher, the
minimum product size is 3 mm.
maximum feed size may be 50 mm.
feed may be highly abrasive (Moh's scale >5).
rotor shaft carrying hammers can be vertical or horizontal.
Size reduction of ice and gypsum can be accomplished suitably by a __________ crusher
Blake jaw
gyratory
None of these.
toothed roll
Which of the following is a batch sedimentation equipment
Filter thickener
dust catcher
Dry cyclone separator
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
1
NONE OF THESE
1.5
2
Fluid energy mill comes in the category of
cutter
ultrafine grinder
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
Compartment
rod
tube
pebble.
1
2
11
22
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