Merits and Drawbacks of Bohr's Model: Bohr's model of the hydrogen atom was no doubt an improvement over Rutherford's nuclear model, as it could account for the stability and line spectra of a hydrogen atom and hydrogen-like ions (for example He+, Li2+, Be3+ and so on). Merits of Bohr's theory: (i) The experimental value of […]

Ball Mill: Operating principles, components, Uses ... Jan 11, 2016· A ball mill also known as pebble mill or tumbling mill is a milling machine that consists of a hallow cylinder containing balls; mounted on a metallic frame such that it can be rotated along its longitudinal axis.

Merits of functional organization: The following are the merits of functional organization. 1. Benefit of Specialization. This system provides ample opportunities for minute specialization to its maximum extent. 2. Expertise Knowledge. This system can be entrusted with higher efficiency as knowledge of the experts in the field are involved ...

ADVERTISEMENTS: Merits of Socialist Economy: (i) No Labour Exploitation: There is only one class in a socialistic economy hence there is no question of exploitation. There are no concept of strikes and lock-outs. Everybody works in a well-knit family way. (ii) Proper Utilisation of Resources: Under this economy, all types of natural resources are utilized […]

Discuss the relative merits and demerits of the four methods of machining external taper on lathe. ... With a neat sketch explain the working principle of electron beam machining and write their advantages. (10) ... Suggest a suitable manufacturing process to produce body of ball pen. Explain the process with proper justification.

Ball Milling,Grain Size And Mechanical Attrition. brief concepts about ball milling, grain size reduction and mechanical attrition. disadvantage of grain size reduction possible change in polymorphic 15 ball mill the mill which is partially filled with balls of steel or disadvantage a hammer mill must be operated with internal or,comparison erp v s roller press ball mill …

Besides materials synthesis, high-energy ball milling is a way of modifying the conditions in which chemical reactions usually take place either by changing the reactivity of as-milled solids (mechanical activation — increasing reaction rates, lowering reaction temperature of the ground powders)—or by inducing chemical reactions during milling (mechanochemistry).

Rotometer. Must to know 2 2 Size Reduction: Objectives, Mechanisms & Laws governing size reduction, factors affecting size reduction, principles, construction, working, uses, merits and demerits of Hammer mill, ball mill, fluid energy mill, Edge runner mill & end runner mill. 3 3 Size Separation: Objectives, applications & mechanism of size

15. Write the demerits of casting? 1.The number of workers required for casting is more 2.Accuracy and finishing is not good. 16. Write the merits of casting? 1. Any material ferrous can be casted 2. It is possible to produce the large component . 17. …

Unit 1 Open. Flow of fluids:Types of manometers, Reynolds number and its significance, Bernoulli's theorem and its applications, Energy losses, Orifice meter, Venturimeter, Pitot tube and Rotometer. Size Reduction:Objectives, Mechanisms & Laws governing size reduction, factors affecting size reduction, principles, construction, working, uses, merits and demerits of …

Size Reduction: Objectives, Mechanisms & Laws governing size reduction, factors affecting size reduction, principles, construction, working, uses, merits and demerits of Hammer mill, ball mill, fluid energy mill, Edge runner mill & end runner mill.

Give merits and demerits of ball mill. 4 Write short notes on any two of the following : (a) Let down conditions (b) Daniel flow point and Wet point (c) Fire hazards in a Paint Industry. what is a thicknesser in a gold plant Nov; kolkata everett quarries sold to what company;

and its applications, Energy losses, Orifice meter, Venturimeter, Pitot tube and Rotometer. SIZE REDUCTION: Objectives, Mechanisms & Laws governing size reduction, factors affecting size reduction, principles, construction, working, uses, merits and demerits of Hammer mill, ball mill, fluid energy mill, Edge runner mill & end runner mill.

Merits of Objective Type Test: 1. Objective type test gives scope for wider sampling of the content. 2. It can be scored objectively and easily. The scoring will not vary from time to time or from examiner to examiner. 3. This test reduces (a) …

what are the merits and demerits of the ball mill in the ... what are the merits and demerits of the ball mill in the grinding process. Mar, disadvantages of ball mill are bulky size running a strong vibration and noise, there must be a solid foundation low efficiency, energy consumption is relatively large grinding the friction loss and a great body, and will stain products crush the …

The maximum capacity ball mills are used for milling ores prior to manufacture of pharmaceutical chemicals. Advantages of Ball Mills 1. It produces very fine powder (particle size less than or equal to 10 microns). 2. It is suitable for milling toxic materials since it can be used in a completely enclosed form. 3. Has a wide application. 4.

Advantages and disadvantages for EDM Machining. Electro-discharge machining is a processing method that is mainly used for hard metals, or is a processing method that is difficult to process using conventional techniques. EDM usually works with conductive materials. Advantages of EDM Machining

cement industry merits and demerits wikipedia. ... (CO 2), creating up to 8% of worldwide man-made emissions of this gas, of which 50% is from the chemical process and 40% from burning fuel. The CO 2 produced for the manufacture of structural concrete (using ~14% cement) ...

Second Hand Ball Mills In Uk Mexico. Buy and sell used batch ball mills perry process 180 ceramic ball mill stock second hand ceramic ball mill working volume about and total volume 180 milling chamber has internal dimensions 600 mm diameter and 620 mm length working rotation rpm machine is driven by electric motor with power location pl add to cart view

March 13, 2011 - PRLog-- Ball mill is the material to be broken, and then to smash the key equipment.The machine consists of feeding part, discharging Department, Rotary Department, the Ministry of transmission (reducer, small transmission gear, motors, electrical control) and other major components.

1. Rigidity: A written constitution is rigid and inelastic. It does not allow full scope for growth and development. It is not adaptable to the changing social and economic conditions. 2. Prone to Revolution: ADVERTISEMENTS: A country with a written constitution is liable to face political upheavals because of the rigidity of its constitutional ...

(c) Distinguish between a BALL MILL and PEBBLE MILL. What is the effect of size, volume and grinding media on grinding. Give merits and demerits of ball mill. 4 Write short notes on any two of the following : (a) Let down conditions (b) Daniel flow point and Wet point (c) Fire hazards in a Paint Industry.

Electron beam machining has the following advantages : It is an excellent process for micro finishing (milligram/ s). Very small holes can be machined in any type of material to high accuracy. Holes of different sizes and shapes can be machined. There is no mechanical contact between the tool and the workpiece.