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You Are On Multi Choice Question Bank SET 451

22551. Filtration should be stopped in a filter press, if the





22552. For coarse reduction of hard solids, use





22553. In a size reduction crushing operation, feed size is 100 to 300 mm. while the product size is 10 to 50 mm. This is a case of the __________ crushing.





22554. Traces of liquid tar fog present in coke oven gas is separated using





22555. Close circuit grinding by a ball mill with air sweeping employs a





22556. Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding.





22557. Choke crushing (in case of a Jaw crusher) compared to free crushing





22558. The specific surface of sherical particles is proportional to (where, Dp = diameter of particle).





22559. Wheat is ground into flour in a





22560. Gravity stamp mill is meant for the __________ crushing.





22561. Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the





22562. Toothed roll crushers achieve size reduction by





22563. The purpose of tyre sipes is





22564. To get ultrafine particles, the equipment used is a





22565. Vacuum filter is most suitable for the





22566. The porosity of a compressible cake is





22567. Which of the following conveyors cannot be recommended for transportation of abrasive materials ?





22568. Separation of materials into products based on the difference of their sizes is called





22569. For classification of potable (drinking) water, we use a __________ filter.





22570. Hot, lumpy & abrasive materials are best transported by using a/an __________ conveyor.





22571. Additives used for promoting the floccula-tion of particles is a/an





22572. In case of grinding in a ball mill





22573. The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area, m2 V = rising velocity of fluid, m/sec.S = percentage of solids in the suspension by volume.ρ = density of solids, kg/m3)





22574. Fick's law relates to





22575. __________ mill is normally used for grinding of talc.





22576. Colloidal mills are used for __________ grinding.





22577. Fluid medium used in the classification technique of mineral beneficiation is





22578. The maximum slope of a belt conveyor can be





22579. The filter medium resistance is controlled by





22580. The unit of filter medium resistance is





22581. During size reduction by a jaw crusher, the energy consumed decreases with the





22582. Which of the following can be most effectively used for clarification of lube oil and printing ink?





22583. Ultracentrifuges running at speeds upto 100000 rpm is normally used for the





22584. Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a __________ operation.





22585. In the cyclone separator used for separation of dust from dust laden gas, the gas





22586. The basic filtration equation is given as where, V is volume of the filtrate ; A is the filtration area, a is specific cake resistance, μ is viscosity of the filtrate, and C is the concentration of the solids in the feed slurry. In a 20 minutes constant rate filtration, 5 m3 of filtrate was obtained. If this is followed by a constant pressure filtration, how much more time in minutes, it will take for another 5 m3 of filtrate to be produced ? Neglect filter medium resistance, Rm ; assume incompressible cake.





22587. Size reduction of fibrous materials like wood, asbestos, mica etc. is done by a disintegrator exemplified by the




22588. The material is crushed in a gyratory crusher by the action of





22589. The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be __________ cms.





22590. Which of the following may prove unsuitable for filtering volatile liquids ?





22591. __________ mean diameter of particles is given by





22592. Mass flow of granular solid (M) through a circular opening of dia, D follows




22593. Sauter mean diameter is the same as the __________ mean diameter.





22594. Cake resistance is





22595. In paint industries, blending of light paste is done by using a





22596. A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is





22597. __________ is used for producing a thick suspension from a thin slurry.





22598. Wet seiving is employed, when the product contains __________ materials.





22599. Energy requirement (per unit mass of material crushed/ground) is highest for





22600. The energy consumed by a ball mill depends on





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