1) Reciprocal of sphericity is termed as the________________? a. Specific surface ratio b. Shape factor c. Sauter diameter d. Surface area per unit mass
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2) Filtration of water in a paper mill is done by a/an _______________ filter? a. Open sand b. Plate and frame c. Vacuum leaf d. Sparkler
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3) With increase in the capacity of screens, the screen effectiveness__________________? a. Remains unchanged b. Increases c. Decreases d. Decreases exponentially
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4) As per Taggart’s formula, the capacity (kg/hr) of Jaw & Gyratory crushers (for gapes of 10 to 60 cms) is equal to (where, L = Length of feed opening, cms S = Maximum width of discharge opening, cms) ? a. LS b. 93 LS c. 250 LS d. √(LS)
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5) To get a fine talc powder from its granules, the equipment used is____________________? a. Roller crusher b. Ball mill c. Jaw crusher d. Gyratory crusher
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6) The controlling resistance in a rotary drum vacuum filter is the ________________ resistance? a. Piping b. Cake c. Filter medium d. None of these
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7) 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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8) Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripheral velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m3 here, V =πND where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m) ? a. 3.6 V.W.Dr.ρ b. 3.6 V.W. ρ c. 3.6 W.Dr.ρ d. 3.6 V.W.Dr/ρ
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9) In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of _______________ crushing? a. Primary b. Secondary c. Fine d. Ultrafine
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10) A fluid energy mill is used for __________________? a. Cutting b. Grinding c. Ultra-grinding d. Crushing
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11) Reciprocating screens are normally inclined at an angle of 5° with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the screening of the ___________________? a. Light metal powder down upto 4 mesh size b. Dry chemicals c. Heavy tonnages of rocks or gravel d. Powdered food & granular materials
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12) Gravity stamp mill is meant for the ___________________ crushing? a. Primary b. Intermediate c. Fine d. Ultrafine
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13) For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter) ? a. π = (A/D2) b. π/6 = (V/D3) c. AD/V d. None of these
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14) _______________ mixer is used for devulcanisation of rubber scrap & making water dispersion & rubber solution? a. Tumbler b. Banbury c. Muller d. Ribbon blender
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15) Which of the following is a fine crusher ? a. Blake jaw crusher b. Gyratory crusher c. Toothed roll crusher d. Dodge jaw crusher
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16) Maximum size reduction in a ball mill is done by the, ______________ action? a. Attrition b. Compression c. Impact d. Cutting
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17) The reduction ratio for grinders is defined as (where, Df and Dp are average diameters of feed and product respectively) ? a. Df/Dp b. Dp/Df c. Df – Dp d. None of these
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18) Sphericity of pulverised coal is__________________? a. 1 b. < 1 c. > 1 d. ∞
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19) Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a ______________ conveyor? a. Drag b. Ribbon c. Screw d. Slat
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20) There is practically no alternative/competitor to _________________ in the beneficiation treatment of sulphide ores? a. Classification b. Tabling c. Jigging d. Froth floatation
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21) With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge________________? a. Increases b. Decreases c. Remains constant d. Increases linearly
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22) Which of the following clay mixing devices is vacuum operated for deairation of clay ? a. Banbury mixer b. Pug mill c. Muller-mixer d. None of these
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23) Introduction of slurry in a plate and frame filter press is done through a plate in each frame. The plate of this filter has a _______________ surface? a. Plane b. Curved c. Ribbed d. Either A. or B.
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24) In classification, particles are said to be equal settling, if they have the same terminal velocities in the_______________? a. Different fluids b. Same fluid c. Same field of force d. Both B. and C.
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25) Which is the most suitable conveyor for transportation of sticky material ? a. Apron conveyor b. Belt conveyor c. Screw conveyor d. Pneumatic conveyor
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26) Dry powdery solid materials are transported by a ______________ conveyor? a. Belt b. Bucket c. Screw d. None of these
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27) Which of the following is used for primary crushing of very hard lumpy materials ? a. Toothed roll crusher b. Gyratory crusher c. Ball mill d. Tube mill
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28) Fluid energy mill comes in the category of________________? a. Grinder b. Crusher c. Cutter d. Ultrafine grinder
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29) Molten ammonium nitrate is mixed with ground limestone in fertilizer plant in a__________________? a. Pug mill b. Mixer-extruder c. Banbury mixer d. Muller mixer
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30) Wheat is ground into flour in a___________________? a. Hammer crusher b. Roller crusher c. Impact mill d. Fluid energy mill
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