Grinding efficiency of a ball mill is of the order of __________ percent. 1-5 40

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Question
Grinding efficiency of a ball mill is of the order of __________ percent.
Options
A. 1-5
B. 40-50
C. 75-80
D. 90-95

Correct Answer

1-5

More questions

3. Pick out the wrong statement.
Options
A. An air cooled finned pipe is diagram-matically represented by
B. A heat exchanger is diagrammatically represented by
C. A 90� welded elbow is diagrammatically represented by
D. A pipe still heater is diagrammatically represented by

5. In closed circuit grinding as compared to open circuit grinding, the
Options
A. specific surface of product is more.
B. product has lesser size uniformity.
C. production rate at a given limiting size is lower.
D. operation is economical.

6. The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then
Options
A. 3/4th of it will disintegrate in two months.
B. it will completely disintegrate in two months.
C. it will completely disintegrate in four months.
D. l/8th of it will remain intact at the end of four months.

7. Bottom of basic open hearth furnace are constructed of
Options
A. dead burnt magnesite ramming mass.
B. porous fireclay bricks.
C. semi-silica bricks.
D. silicon carbide bricks.

8. Thermal conductivity of refractory bricks
Options
A. increases with decrease in porosity.
B. decreases with decreases in porosity.
C. is independent of its porosity and is maximum for insulating bricks.
D. increases with the amount of air entrapped in pores.

10. The forces causing the vaporisation of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporisation
Options
A. increases with pressure rise.
B. decreases with increasing pressure.
C. becomes zero at the critical point.
D. both (b) & (c).

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