Discussion
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- Question
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).
- Correct Answer
- all (a), (b) and (c).
- 1. 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. Discuss
- 2. Fluid energy mill comes in the category of
Options- A. grinder
- B. crusher
- C. cutter
- D. ultrafine grinder Discuss
- 3. The reduction ratio for grinders is defined as(where, Df and Dp are average diameters of feed and product respectively).
Options- A. Df/Dp
- B. Dp/Df
- C. Df - Dp
- D. none of these Discuss
- 4. 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 Discuss
- 5. Filter medium resistance is that offered by the
Options- A. filter cloth.
- B. embedded particles in the septum.
- C. filter cloth and the embedded particle collectively.
- D. none of these. Discuss
- 6. 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.
Discuss
- 7. Which one is a filter aid?
Options- A. Convas fabric
- B. Diatomaceous earth
- C. Calcined lime
- D. None of these Discuss
- 8. __________ conveyors are also called scrapers.
Options- A. Apron
- B. Screw
- C. Helical flight
- D. both (b) & (c) Discuss
- 9. Screen capacity is expressed in terms of
Options- A. tons/hr
- B. tons/ft2
- C. both (a) & (b)
- D. tons/hr-ft2 Discuss
- 10. In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of __________ crushing.
Options- A. primary
- B. secondary
- C. fine
- D. ultrafine Discuss
Mechanical Operations problems
Search Results
Correct Answer: Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow.
Correct Answer: ultrafine grinder
Correct Answer: Df/Dp
Correct Answer: constant rate
Correct Answer: filter cloth and the embedded particle collectively.
Correct Answer:
Correct Answer: Diatomaceous earth
Correct Answer: both (b) & (c)
Correct Answer: tons/hr-ft2
Correct Answer: fine
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