Length/diameter ratio of a ball mill is
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The optimum moisture content in solids to be crushed/ground ranges from __________ percent.
A. 3 to 4
B. 8 to 10
C. 10 to 15
D. 15 to 20
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Apron conveyors are used for
A. Heavy loads & short runs
B. Small loads & long runs
C. Heavy loads & long runs
D. None of these
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Carbon black is pulverised in a
A. Hammer crusher
B. Ball mill
C. Roll crusher
D. Gyratory crusher
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Size reduction of moulding powders, waxes, resins & gums are done in a __________ mill.
A. Cage
B. Hammer
C. Both A & B
D. Neither A nor B
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Ball mills and tube mills with flint or porcelain balls are used for size reduction of
A. Asbestos
B. Rubber
C. Non-metallic ores
D. Limestone
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Shell and leaf filter as compared to plate and frame filter
A. Entails less labor cost
B. Facilitates filtration under higher pressure
C. Provides more effective washing
D. All of the above
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As particle size is reduced
A. Screening becomes progressively more difficult
B. Screening becomes progressively easier
C. Capacity and effectiveness of the screen is increased
D. None of these
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In case of grinding in a ball mill
A. Wet grinding achieves a finer product size than dry grinding
B. Its capacity decreases with increasing fineness of the products
C. Grinding cost and power requirement increases with increasing fineness of the products
D. All of the above
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Pine oil used in froth floatation technique acts as a/an
A. Collector
B. Modifier
C. Frother
D. Activator
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Which of the following is a batch sedimentation equipment?
A. Dust catcher
B. Filter thickener
C. Dry cyclone separator
D. Rotary sprayer scrubber
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The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the __________ filter.
A. Vacuum
B. Sand
C. Plate & frame
D. Rotary
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The main size reduction operation in ultrafine grinders is
A. Cutting
B. Attrition
C. Compression
D. Impact
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Which of the following is not accomplished by agitation of liquids in agitators?
A. Dispersing gas in liquid
B. Blending of immiscible liquids
C. Dispersing immiscible liquid in form of emulsion
D. Suspending solid particles
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__________ centrifuge is the most suitable for separation of non-friable crystals.
A. Tubular bowl
B. Disc-bowl
C. Perforated horizontal basket continuous
D. Suspended batch basket
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The resistance offered by the filter used in a bag filter is proportional to (where, c = dust concentration and s = particle size)
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The material is crushed in a gyratory crusher by the action of
A. Impact
B. Compression
C. Attrition
D. Cutting
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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 ).
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Ball mill is used for
A. Crushing
B. Coarse grinding
C. Fine grinding
D. Attrition
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Basic slag is not ground in
A. Jaw crushers
B. Ball mills
C. Compartment mills
D. Tube mills
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