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1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q41 ⇒ Fibrous material is broken by a squirrel-cage disintegrator [other wrong options] [Discuss in forum] rollcrusher ball mill tube mill |
Q42 ⇒ The most suitable equipment for the transportation of 200 mesh size particles is a pneumatic conveyor [other wrong options] [Discuss in forum] bucket elevator screw conveyor belt conveyor |
Q43 ⇒ What is the selectivity index, if the grade of tailings & concentrate is the same ? 1 [other wrong options] [Discuss in forum] 0 ∞ 0.5 |
Q44 ⇒ Size reduction of moulding powders, waxes, resins & gums are done in a __________ mill. both (a) & (b) [other wrong options] [Discuss in forum] cage hammer id) neither (a) nor (b) |
Q45 ⇒ Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately ? Rittinger's law [other wrong options] [Discuss in forum] Kick's law Bond's law none of these |
Q46 ⇒ A __________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream. strainer [other wrong options] [Discuss in forum] thickener classifier clarifier |
Q47 ⇒ Size reduction does not occur due to compression in case of rod mills [other wrong options] [Discuss in forum] gyratory crushers jaw crushers smooth roll crushers |
Q48 ⇒ Limestone is normally crushed in a hammer crusher [other wrong options] [Discuss in forum] roll crusher ball mill tube mill |
Q49 ⇒ Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity ? Sphere [other wrong options] [Discuss in forum] Cube Cylinder (L/D = 1) Raschig rings |
Q50 ⇒ For the transportation of ultrafine particles, the equipment used is a........conveyor. pneumatic [other wrong options] [Discuss in forum] belt screw none of these |
Q51 ⇒ Moisture can be removed from lubricating oil using tubular centrifuge [other wrong options] [Discuss in forum] clarifier sparkler filter vacuum leaf filter |
Q52 ⇒ Work index is defined as the gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen. [other wrong options] [Discuss in forum] energy needed to crush one tonne of feed to 200 microns. energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen. energy needed to crush one ton of feed to 100 microns. |
Q53 ⇒ 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 kW. sec/kg [other wrong options] [Discuss in forum] kWh/kg kWh/sec. kg kg/sec. |
Q54 ⇒ For a cyclone of diameter 0.2 m with a tangential velocity of 15 m/s at the wall, the separation factor is 230 [other wrong options] [Discuss in forum] 2250 1125 460 |
Q55 ⇒ Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid ? Vacuum filter [other wrong options] [Discuss in forum] Sand bed filter Plate and frame filter press Batch basket centrifuge. |
Q56 ⇒ Rittinger's crushing law states that work required in crushing is proportional to the new surface created. [other wrong options] [Discuss in forum] work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product. work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product. for a given machine and feed, crushing efficiency is dependent on the size of the feed & product. |
Q57 ⇒ Size measurement of ultrafine particles can be best expressed in terms of surface area per unit mass [other wrong options] [Discuss in forum] centimetre screen size micron |
Q58 ⇒ Separation of materials of the same density based on their sizes by using then-different rates of flow is called sizing [other wrong options] [Discuss in forum] sorting flocculation elutriation |
Q59 ⇒ As particle size is reduced screening becomes progressively more difficult. [other wrong options] [Discuss in forum] screening becomes progressively easier. capacity and effectiveness of the screen is increased. none of these. |
Q60 ⇒ Dry powdery solid materials are transported by a __________ conveyor. screw [other wrong options] [Discuss in forum] belt bucket none of these |
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