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You Are On Multi Choice Question Bank SET 448

22401. A pebble mill





22402. The study on washability of coal is done by using the __________ technique.





22403. Horsepower required for a roll crusher is directly proportional to its





22404. A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index is 4.5, the volume fraction of solids in the suspension is





22405. __________ conveyor is the most suitable for long distance transportation of cold, non-abrasive granular/irregular shape/fine materials.





22406. The specific cake resistance for compressible sludges is a function of the pressure drop





22407. Moisture can be removed from lubricating oil using





22408. Tabling process used for separating two materials of different densities by passing the dilute pulp over a table/deck, which is inclined from the horizontal surface at an angle of about





22409. Brakes fading occurs at





22410. Addition of filter aid to the slurry before filtration is done to ...... of the cake.





22411. Which of the following terminology is not used for size reduction of materials to fine sizes or powders?





22412. A tube mill as compared to a ball mill





22413. 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





22414. Which of the following gives the crushing energy required to create new surface ?





22415. In filtration, the use of 'filter aid' helps in





22416. Which of the following is the oldest dynasty?





22417. Gizzlies are used for separating __________ solids.





22418. Which of the following clay mixing devices is vacuum operated for deairation of clay?





22419. Pick out the material having minimum Rittinger's number.





22420. __________ mills are termed as impactors.





22421. In case of a revolving mill, wet grinding compared to dry grinding





22422. To get a fine talc powder from its granules, the equipment used is





22423. For a cyclone of diameter 0.2 m with a tangential velocity of 15 m/s at the wall, the separation factor is





22424. Width and speed of a conveyor belt depends upon the __________ of the material.





22425. Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for





22426. The air removing process of the hydraulic brake system is known as





22427. Which of the following size reduction equipments employs mainly attrition for ultrafine grinding ?





22428. Tank filter (e.g., Nutsch filter) is





22429. In bag filters, filter fabrics are never made of





22430. Use of 'grinding aids' is done in __________ grinding.





22431. Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)





22432. Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid ?





22433. All resistances during washing of cake





22434. A __________ mixer resembles a ball mill without balls.





22435. __________ conveyor is the most suitable for short distance transportation of non-abrasive loose materials like garbage, grain, food wastes etc.





22436. As the product becomes finer, the energy required for grinding





22437. Gyratory crushers compared to the reciprocating jaw crushers





22438. The important dimensional group involved in the power requirement calculation in mixing operation is the __________ number.




22439. At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5 : Power number Re = ρ N D2/μ: Reynold's number N is the impeller rotational speed, and D is the impeller diameter.





22440. Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines ?





22441. Rittinger's crushing law states that





22442. Mechanical conveyors which push the material along an endless trough or tube are called scrappers. Which of the following conveying equipments comes under the category of 'scrappers' ?





22443. Sphericity of pulverised coal is





22444. The reduction ratio for fine grinders is





22445. In service procedure,to install means to





22446. General mechanism of size reduction in intermediate and fine grinder is by





22447. A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for __________ flow of filtrate.





22448. The work index in Bond's law for crushing of solids has the following dimensions





22449. Ore concentration by jigging is based on the difference in the __________ of the particles.





22450. Size measurement of ultrafine particles can be best expressed in terms of





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