Which of the following achieves the least reduction ratio for a given feed size ?
A. Jaw crusher
B. Roll crusher
C. Cone crusher
D. Gyratory crusher
Month: February 2019
Size measurement of ultrafine particles can be best expressed in terms of___________________?
Size measurement of ultrafine particles can be best expressed in terms of___________________?
A. Centimetre
B. Screen size
C. Micron
D. Surface area per unit mass
Rittinger number which designates the new surface produced per unit of mechanical energy absorbed by the material being crushed, depends on the ______________________?
Rittinger number which designates the new surface produced per unit of mechanical energy absorbed by the material being crushed, depends on the ______________________?
A. State or manner of application of the crushing force
B. Ultimate strength of the material
C. Elastic constant of the material
D. All A., B. and C.
During filtration operation, the filtrate encounters the resistance of the ___________________?
During filtration operation, the filtrate encounters the resistance of the ___________________?
A. Filter medium
B. Cake
C. Channel carrying the slurry to the upstream side of the cake and filtrate away from the filter
medium
D. All A., B. and C.
_____________ is the most suitable for compounding rubber and plastic solids ?
_____________ is the most suitable for compounding rubber and plastic solids ?
A. Banbury mixer
B. Pan mixer
C. Pug mill
D. Charge can mixer
What is the reduction ratio in a fine crushing operation having following feed and product sizes ?
What is the reduction ratio in a fine crushing operation having following feed and product sizes ?
A. 0.5
B. 2
C. 5
D. 10
For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter D. as_________________?
For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter D. as_________________?
A. d
B. √d
C. d2
D. 1/d
For efficient grinding, ball mills must be operated__________________?
For efficient grinding, ball mills must be operated__________________?
A. At a speed less than the critical speed
B. At a speed more than the critical speed
C. At a speed equal to the critical speed
D. With minimum possible small balls
Rittinger’s number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger’s number of a material indicates its________________?
Rittinger’s number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger’s number of a material indicates its________________?
A. Easier grindability
B. Poor grindability
C. High power consumption in grinding
D. None of these
Carbon black is pulverised in a_______________?
Carbon black is pulverised in a_______________?
A. Hammer crusher
B. Ball mill
C. Roll crusher
D. Gyratory crusher