22452. Which is a secondary crusher for a hard & tough stone ?
22453. 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.)
22454. Cyclones are used primarily for separating
22455. There is practically no alternative/competitor to __________ in the beneficiation treatment of sulphide ores.
22456. Separation of isotopes is generally done using a/an __________ centrifuge.
22457. Temperature of the product during ultrafine grinding
22458. 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
22459. In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.
22460. Separation of materials of the same density based on their sizes by using then-different rates of flow is called
22461. Molten ammonium nitrate is mixed with ground limestone in fertilizer plant in a
22462. Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are
22463. For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as
22464. With increase in the capacity of screens, the screen effectiveness
22465. As particle size is reduced
22466. Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the
22467. Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively.
22468. For efficient grinding, ball mills must be operated
22469. 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.
22470. For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter)
22471. The reduction ratio for grinders is defined as(where, Df and Dp are average diameters of feed and product respectively).
22472. Pick out the wrong statement pertaining to the turbine agitator.
22473. A fluid energy mill is used for
22474. Which meter indicate the total mileage covered?
22475. Dry powdery solid materials are transported by a __________ conveyor.
22476. Fluid energy mill comes in the category of
22477. Filtration capacity of a rotary drum vacuum filter depends upon the
22478. Who shifted the capital from Padmanabhapuram to Thiruvananthapuram?
22479. __________ conveyors are also called scrapers.
22480. For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid ?
22481. Which of the following is a continuous filter?
22482. During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration
22483. In screen analysis, the notation +5 mm/-10 mm means particles passing through
22484. Panslav movement was led by?
22485. Optimum ratio of operating speed to critical speed of a trommel is
22486. The process opposite to 'dispersion' is termed as the
22487. The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant __________ filtration.
22488. Grinding efficiency of a ball mill is of the order of __________ percent.
22489. Solid particles of different densities are separated by
22490. During agitation of liquids, power consumption during laminar flow is not proportional to the
22491. Trommels are revolving screens which normally operate in the range of __________ rpm.
22492. The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be
22493. Maximum size reduction in a fluid energy mill is achieved by
22494. Filtration rate through a filter cake is proportional to (where, S = filtering surface R = specific cake resistance μ = viscosity of the filtrate)
22495. A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ρL) located at a radial distance R from the axis of rotation. The thickness of the liquid film is δ and no cake is formed. The initial pressure drop during filtration is
22496. Which one is a filter aid ?
22497. To remove dirt from the flowing fluid, we use a
22498. Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher ?
22499. Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the