Size reduction mechanism used in Jaw crushers is__________________?
A. Attrition
B. Compression
C. Cutting
D. Impact
Month: February 2019
Wet sieving is employed, when the product contains ________________ materials?
Wet sieving is employed, when the product contains ________________ materials?
A. Abrasive
B. Large quantity of very fine
C. Coarse
D. Non-sticky
According to Taggart’s rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than_______________?
According to Taggart’s rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than_______________?
A. 0.00184
B. 0.0184
C. 0.184
D. 1.84
What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls ?
What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls ?
A. 0.5
B. 1.0
C. 2.76
D. 0.66
The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond’s law) of the energy to grind the particles from a very large size to 50 μm is________________?
The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond’s law) of the energy to grind the particles from a very large size to 50 μm is________________?
A. 6.35 kWh/ton
B. 9.0 kWh/ton
C. 18 kWh/ton
D. 25.4 kWh/ton
_______________ mill is not used for grinding wheat into flour and for milling of cereals & other ?
_______________ mill is not used for grinding wheat into flour and for milling of cereals & other ?
vegetable products.
A. Buhrstone
B. Roller
C. Attrition
D. Pebble
Jigging is a technique by which different particles can be____________________?
Jigging is a technique by which different particles can be____________________?
A. Separated by particle size
B. Separated by particle density
C. Separated by particle shape
D. Mixed
For the preliminary breaking of hard rock, we use a____________________?
For the preliminary breaking of hard rock, we use a____________________?
A. Gyratory crusher
B. Ball mill
C. Tube mill
D. Squirrel-cage disintegrator
_____________ is the most commonly used ‘filter aid’?
_____________ is the most commonly used ‘filter aid’?
A. Diatomaceous earth
B. Fuller’s earth
C. Vermiculite
D. Semi-plastic clay
Which of the following is not accomplished by agitation of liquids in agitators ?
Which of the following is not accomplished by agitation of liquids in agitators ?
A. Dispersing gas in liquid
B. Blending of immiscible liquids
C. Dispersing immiscible liquid in form of emulsion
D. Suspending solid particles