Kick's law assumes that the energy required for size reduction is proportional to the logarithm of the ratio between the initial and the final diameters. The unit of Kick's constant is
A. KW. sec/kg
B. KWh/kg
C. KWh/sec. kg
D. Kg/sec
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Which of the following minerals is not subjected to magnetic separation method?
A. Rutile
B. Galena
C. Chromite
D. Siderite
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To produce talcum powder, use
A. Ball mill
B. Hammer mill
C. Jet mill
D. Pin mill
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Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called
A. Classification
B. Froth floatation
C. Thickening
D. Clarification
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Production rate __________ with increased fineness, with a given energy input to the size reduction machine.
A. Decreases
B. Increases
C. Remains unchanged
D. May increase or decrease; depends on the machine
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Driving force in case of filtration by a centrifuge is the
A. Speed of the centrifuge
B. Centrifugal pressure exerted by the liquid
C. Narrow diameter of the vessel
D. Formation of highly porous cake
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The main differentiation factor between tube mill and ball mill is the
A. Length to diameter ratio
B. Size of the grinding media
C. Final product size
D. Operating speed
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For transporting pasty material, one will use a/an
A. Apron conveyor
B. Belt conveyor
C. Screw colaveyor
D. Bucket elevator
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Pick out the wrong statement.
A. More commonly used jaw crusher between Dodge jaw crusher and Blake jaw crusher is the later one
B. There are only four methods namely compression, impact, attrition and cutting, which the size reduction equipments employ
C. Cutting machines mainly employ 'attrition' for size reduction of solids
D. Operating principles of Dodge and Blake jaw crushers are combined in the working of universal jaw crushers
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Tube mill compared to ball mill
A. Produces finer products
B. Is long in comparison with its diameter
C. Uses smaller balls
D. All of the above
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Mixing of light fine powder such as insecticides is done by
A. Banbery mixer
B. Pug mill
C. Impact wheels
D. Kneader
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In a roll crusher, the specific power consumption and the production rate is affected by the
A. Reduction ratio
B. Differential roll speed
C. Both A & B
D. Neither A nor B
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Fluid medium used in the classification technique of mineral beneficiation is
A. Air
B. Water
C. Both A & B
D. Neither A nor B
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Maximum size reduction in a fluid energy mill is achieved by
A. Compression
B. Interparticle attrition
C. Cutting
D. Impact
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Mass flow of granular solid (M) through a circular opening of dia, D follows
A. B. M ∝ D2
C. M ∝ D3
D. M ∝ D
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With increase in drum speed, in a rotary drum filter, the filtration rate
A. Increases
B. Increases linearly
C. Decreases
D. Is not affected
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The filter medium resistance is controlled by
A. Pressure drop alone
B. Flow rate alone
C. Both pressure drop and flow rate
D. Cake thickness
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The energy consumed by a ball mill depends on
A. Its speed
B. Its ball load
C. The density of the material being ground
D. All of the above
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Mixer used for rubber compounding is
A. Mixer-extruder
B. Banbury internal mixer
C. Muller mixer
D. Pug mill
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Electrical energy consumed by a jaw crusher is not a function of the
A. Average feed size
B. Average product size
C. Machine capacity
D. None of these
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