250+ TOP MCQs on Wood Chips Preparation and Handling at the Pulp Mill and Answers A closed tank containing water is moving in a horizontal direction along a straight line at a constant speed. The tank also contains a steel ball and a bubble of air

Mechanical Operations MCQ’s – Ball Mill. 1 - Question. What is the average particle size of ultra-fine grinders? a) 1 to 20 m b) 4 to 10 m c) 5 to 200 m d) 50 to 100 m. View Answer & Solution. Answer: a Explanation: The particle averaging 1 to 2 m in size with substantially all particles through a standard 325 mesh screen

9. A ball mill uses _____ a) Impact b) Attrition c) Impact & Attrition d) None of the mentioned Answer: c 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

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)

Delivery Site of Ball Mills Ordered by Vietnamese Customers. More+. GET IN TOUCH. Address Gongye Road and Tonghang Er Road crossing, Shangjie District, zhengzhou, Henan Province, China. Email [email protected] Phone 766. Henan Hongke Heavy Machinery Co., Ltd

Overview of Ball mill. Ball mill is the key equipment used in grinding of materials after being primarily crushed, which is widely used in the manufacturing industry of cement, silicate product, new building material, refractory, fertilizer, mineral processing of black and non-ferrous metals as well as glass ceramic for the grinding of all kinds of ores and other grindable materials

Apr 13, 2021 22. For effective operation of ball mill the ball charge (% volume of mill filled by the balls) should be (a) 60–70% (b) 30–50% (c) 30% (d) 50%. 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

1. is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle. 2. has the dimension of length. 3. is the ratio of volume of a sphere having the same surface area as the particle to the actual volume of the particle. 4. is always less than 1

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. 6

May 05, 2021 22. For effective operation of ball mill the ball charge (% volume of mill filled by the balls) should be (a) 60–70% (b) 30–50% (c) 30% (d) 50%; 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

Aug 17, 2021 Aug 17, 2021 Principle The ball mill operates on the principle of impact and attrition. In this, impact occurs between fast moving balls and the powder material while the attrition mode comes in action when the hollow cylinder rotates on its longitudinal axis

Sep 08, 2021 Advantages of ball mill (a) It can produce very fine powder (b) Can be used for batch as well as continuous grinding (c) Can be sterilized & used for parenteral and ophthalmic preparations. (d) All of the above. Answer: d. Pharmaceutics mcq Questions. Disadvantages of short tube evaporator (a) It is quite complicated and expensive in construction

Lathe Machine MCQ Question 10. A lathe consumes 500 W when running idle and 2500 W when cutting a steel specimen at 30 m/min. If the depth of cut is 4 mm and feed rate is 0.25 mm/rev, the cutting force and the approximate value of torque at a spindle run of 120 r.p.m. will respectively be. 4000 N

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

Product size achieved by Ball mill? The hammer mill operates on the principle of: The working of Fluid energy mill is based on principle of; ... Furthermore, you can discuss a MCQs on discussion page. We also accept requests for mcqs HERE. Contributions through files