36551. A __________ mixer resembles a ball mill without balls.
36552. __________ conveyor is the most suitable for short distance transportation of non-abrasive loose materials like garbage, grain, food wastes etc.
36553. As the product becomes finer, the energy required for grinding
36554. Gyratory crushers compared to the reciprocating jaw crushers
36555. The important dimensional group involved in the power requirement calculation in mixing operation is the __________ number.
36556. 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.
36557. Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines ?
36558. Rittinger's crushing law states that
36559. 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' ?
36560. Sphericity of pulverised coal is
36561. The reduction ratio for fine grinders is
36562. In service procedure,to install means to
36563. General mechanism of size reduction in intermediate and fine grinder is by
36564. A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for __________ flow of filtrate.
36565. The work index in Bond's law for crushing of solids has the following dimensions
36566. Ore concentration by jigging is based on the difference in the __________ of the particles.
36567. Size measurement of ultrafine particles can be best expressed in terms of
36568. Reduction ratio of crushers is the
36569. Which is a secondary crusher for a hard & tough stone ?
36570. Which of the following equations is Rittinger's crushing law ? (where P = power required by the machine, m = feed rate, k = a constant = volume surface mean diameter of feed & product respectively.)
36571. Cyclones are used primarily for separating
36572. There is practically no alternative/competitor to __________ in the beneficiation treatment of sulphide ores.
36573. Separation of isotopes is generally done using a/an __________ centrifuge.
36574. Temperature of the product during ultrafine grinding
36575. 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
36576. In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.
36577. Separation of materials of the same density based on their sizes by using then-different rates of flow is called
36578. Molten ammonium nitrate is mixed with ground limestone in fertilizer plant in a
36579. Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are
36580. For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as
36581. With increase in the capacity of screens, the screen effectiveness
36582. As particle size is reduced
36583. Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the
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