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- Question
Xanthates are used in the froth floatation process as a/an
Options- A. conditioner
- B. frother
- C. collector
- D. activator
- Correct Answer
- collector
- 1. The most efficient equipment for the removal of sub-micronic dust particles from blast furnace gas is the
Options- A. venturi atomiser
- B. gravity settling chamber
- C. electro-static precipitator
- D. cyclone separator Discuss
- 2. Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is __________ microns.
Options- A. < 5
- B. 10 to 25
- C. < 74
- D. > 1000 Discuss
- 3. With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge
Options- A. increases
- B. decreases
- C. remains constant
- D. increases linearly Discuss
- 4. Sphericity of raschig ring (whose length and diameter are equal) is
Options- A. >1
- B. <1
- C. 1
- D. 2 Discuss
- 5. Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed?
Options- A. Wet grinding in low viscous suspension.
- B. Wet grinding in high viscous suspension.
- C. Dry grinding of large particles (upto 1.25 cms).
- D. Dry grindng of large particles in un-baffed mills. Discuss
- 6. A filter press is
Options- A. a batch filter.
- B. not suitable, if the liquid is the main product.
- C. having prohibitively high maintenance cost.
- D. not suitable for wide range of materials under varying operating conditions of cake thickness and pressure. Discuss
- 7. The capacity of a gyratory crusher is __________ that of a jaw crusher with the same gape, handling the same feed & for the same product size range.
Options- A. same as
- B. 2.5 times
- C. 5 times
- D. 10 times Discuss
- 8. Use of grinding aids results in the
Options- A. enhanced production rate.
- B. finer products.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
- 9. A __________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream.
Options- A. thickener
- B. classifier
- C. strainer
- D. clarifier Discuss
- 10. The main differentiation factor between tube mill and ball mill is the
Options- A. length to diameter ratio.
- B. size of the grinding media.
- C. final product size.
- D. operating speed. Discuss
Mechanical Operations problems
Search Results
Correct Answer: electro-static precipitator
Correct Answer: < 74
Correct Answer: increases
Correct Answer: 1
Correct Answer: Dry grindng of large particles in un-baffed mills.
Correct Answer: a batch filter.
Correct Answer: 2.5 times
Correct Answer: neither (a) nor (b).
Correct Answer: strainer
Correct Answer: length to diameter ratio.
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