22501. Which of the following comes in the category of primary crusher for hard and tough stone ?
22502. Crushing efficiency of a machine ranges between __________ percent.
22503. Screen capacity is expressed in terms of
22504. A screen is said to be blinded, when the
22505. What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls ?
22506. Percentage of drum submerged in the slurry in case of rotary drum filter is
22507. Filter medium resistance is that offered by the
22508. In a roll crusher, both the rolls
22509. Tube mill compared to ball mill
22510. For the preliminary breaking of hard rock, we use a
22511. Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the __________ filtration.
22512. Which instrument is used to measure the speed of a running vehicle?
22513. Which of the following oxides is not present in hematite iron ore?
22514. Ribbon blenders are exclusively meant for
22515. In closed circuit grinding as compared to open circuit grinding, the
22516. Steering ratio of the steering gear is the ratio between
22517. Gelatinous solid (which plug the septum) can be filtered by a __________ filter.
22518. During the washing of cake
22519. The opening of a 200 mesh screen (Taylor series) is
22520. A gravity decanter is meant for the separation of two __________ density.
22521. The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the __________ filter.
22522. Separation of solid particles based on their densities is called
22523. Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator?
22524. __________ are mixed using ribbon blenders.
22525. During agitation of liquids, the
22526. For crushing of solids, the Rittinger's law states that the work required for crushing is proportional to
22527. In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the __________ crushing.
22528. 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 )
22529. The process by which fine solids is removed from liquids is termed as
22530. Which of the following crushing laws is most accurately applicable to the fine grinding of materials ?
22531. Shell and leaf filter as compared to plate and frame filter
22532. Metallic wire mesh is used as a filtering medium for the separation of dust from dust laden gas in case of a/an
22533. Which of the following is a coarse crusher?
22534. Sorting classifiers employing differential settling methods for separation of particles make use of the differences in their
22535. Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called
22536. The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake)
22537. To produce talcum powder, use
22538. Angle of nip of the crushing rolls does not depend upon the
22539. Paddle agitator
22540. The working principle of hydraulic brake system
22541. Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a __________ conveyor.
22542. Soft & non-abrasive materials can be made into fines by
22543. In constant pressure filtration,
22544. The critical speed of a trommel (N) is related to its dia (D) as
22545. Which of the following minerals is not subjected to magnetic separation method?
22546. Which of the following is not a revolving/tumbling mill used for size reduction?
22547. Which of the following achieves the least reduction ratio for a given feed size?
22548. When it is operated,which mechanism is going to off stage