2) Critical speed of a ball mill depends on (A) the radius of the mill (shell) and the radius of the particles (B) the radius of the mill (shell) and the density of the particles (C) the radius of the balls and the radius of the particles (D) the radius of the balls and the radius of the mill (shell)
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Clarification: A ball mill uses both impacts when the solids fall from the top to the bottom and attrition when the particles rub against each other and reduce in size. 10. Which of the following uses attrition? a) Ball mill b) Plate mill c) Roller mill d) All of the mentioned Answer: d Clarification: All of the mentioned use attrition for size
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a) Impact and attrition. b) Compression and attrition. c) Shear and compression. d) Tear and impact. Answer: a. Clarification: Ball mill works on the principle of impact and attrition. Size reduction is done by impact as the balls drop from near the top of the shell. A ball mill consists of a hollow cylindrical shell rotating about its axis
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1. Size enlargement (opposite of size reduction) is not a mechanical operation. 2. Wear and tear in wet crushing is more than that in dry crushing of materials. 3. A 'dust catcher' is simply an enlargement in a pipeline which permits the solids to settle down due to reduction in velocity of the dust laden gas. 4
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Sep 26, 2020 The Ball Mill cylinder contains metallic balls occupying around ----- of total capacity.? 30 to 50%? 40 to 50%? 20 to 30%? 30 to 60%; Which statement is TRUE for Ball Mill?? If the machine is rotated at low speed the balls collide with each other and no or negligible size reduction takes place. ... Pharmaceutics MCQs Pharmaceutics MCQs You may
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Jan 08, 2021 MCQ in Variable Loads and Stress Concentration. MCQ in Columns and Central Loads. MCQ in Combine Stresses. MCQ in Ball and Roller Bearings. MCQ in Journal and Plane-Surface Bearings. MCQ in Flexible transmission, flat belts, v-belts, and chains. MCQ in Screw Fastening and Rivets. MCQ in Springs. MCQ in Shafts
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Jun 26, 2021 Pharmaceutical Engeeneering Mcq Pdf, Pharmaceutical Engeeneering Mcq Pdf With Answers. ... Which of the following mill is used to reduce the size of heat liable substances (A) Ball mill (B) Pebble mill (C) Fluid energy mill (D) Colloidal mill. Ans - C. 6. If corrosion is generally confined to a metal surface, then it is known as
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This set of Mechanical Operations Multiple Choice Questions & Answers (MCQs) focuses on Ball Mill. 1. What is the average particle size of ultra-fine grinders? Explanation: The particle averaging 1 to 2 m in size with substantially all particles through a standard
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in case of a ball mill mcq. A. It is abrasive to the coal pulveriser (i.e.ball mill) and the combustion chamber B. The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the ash C
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Basic Civil Engineering MCQs Manufacture of Tiles. 1 - Question. 1. How many operations are involved in the manufacturing of tiles? a) 5 b) 6 c) 10 d) 8. ... A third particle reduction is carried out using ball mill. 4 - Question. 4. At what point is a glaze applied to a tile? a) Finished tile b) Drying c) Placing d) Firing
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Apr 13, 2021 23. Critical speed of the ball mill is the speed at which (a) Balls begin to centrifuge with the mill (b) Balls cascade over one another (c) Balls are carried up the sides and fall freely onto material (d) Balls start tumbling. 24. Rouwolfia and Glycirriza can be size reduced the best way by of (a) Roller mill (b) Ball mill (c) Cutter mill (d
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coarse feed requires a larger ball. b. fine feed requires a larger ball. operating speed should be more than the critical speed. d. View Answer Report Discuss 50-50! Answer: (a). coarse feed requires a larger ball. 73. The operating speed of a ball mill should be __________ the critical speed
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Feb 01, 2021 This is the short aptitude test with 10 to 20 multiple choice questions (MCQs) from pharmaceutics based on diploma in pharmacy syllabus. This is the short aptitude test with 10 to 20 multiple choice questions (MCQs) from pharmaceutics based on diploma in pharmacy syllabus. ... Ball mill works on the both princilpes of Attrition and impact. 6 of
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123. For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (N p) varies with N Re as. Np NRe; Np NRe
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Multiple Choice Questions and Answers (MCQ) on Chemical Engineering Mechanical Operations 01. In case of a hammer crusher, the (A) Feed may be highly abrasive (Mohs scale >5) (B) Minimum product size is 3 mm (C) Maximum feed size may be 50 mm (D) Rotor shaft carrying hammers can be vertical or horizontal Answer: Option D 02. A gravity decanter is meant for the separation of two _____ density
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Milling Machine Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries
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Used, unused and refurbished ball mills available for a fraction of the cost of new. US-based Phoenix Equipment is a global buyer & seller of ball mills, as well as other industrial equipment. Check out our extensive inventory or talk to a knowledgeable representative today
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Multiple Choice Questions for Mechanical Operations MCQs for Mechanical Operations | Practice Objective Questions for Mechanical Operations ... A fluid energy mill is used for. A. Cutting. B. Grinding. C. Ultra grinding. D. Crushing. ... _____ balls capable of grinding the feed in a ball mill gives the maximum efficiency. A. Cast iron. B
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Ball Mill. SBM ball mill is one of the new high efficient grinding machine,which is widely used in the in various types of stone grinding plant, ore benefication, electricity, cement and chemical industries.This new type ball mill with high comminution ratio, it can carry out dry or wet pulverizing and can meet demand for sustainable large-scale production
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Jul 17, 2021 For achieving maximum capacity of the ball mill, the ball charge should be equal to about _____ percent of the ball mill volume? Hamad Mechanical Operations 17/07/2021. A. 10 B. 25 C. 50 D. 75. Related Mcqs: Which one is a filter aid ? A. Canvas fabric B
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