Half the angle of nip, (?), for a roll crusher is given by (where, dr, dp and df

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Question
Half the angle of nip, (?), for a roll crusher is given by (where, dr, dp and df are diameters of crushing rolls, feed particles and rolls gap respectively).
Options
A.
B.
C.
D.

Correct Answer

1. Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the
Options
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).

2. Pick out the wrong statement pertaining to the turbine agitator.
Options
A. Recommended peripheral speed for the turbine agitator is 200-250 metres/minute.
B. Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow.
C. Generally, the diameter of the agitator is kept between l/3rd to l/6th of the tank diameter while the blade length is l/4th of agitator diameter (with central disc, it is l/8th of the agitator diameter).
D. Turbine agitator should be located at a height not less than one agitator diameter length from the bottom. If the depth of liquid in the tank is more than twice the agitator diameter, two agitators should be used.

5. Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the __________ filtration.
Options
A. constant rate
B. varying pressure
C. varying rate
D. constant pressure

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