Discussion
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- Question
__________ mill is not used for grinding wheat into flour and for milling of cereals & other vegetable products.
Options- A. Buhrstone
- B. Roller
- C. Attrition
- D. Pebble
- Correct Answer
- Pebble
- 1. Float and sink test determines the possibility of cleaning of coal by a process based on the
Options- A. gravity separation
- B. wettability
- C. particle shape
- D. none of these Discuss
- 2. The cummulative mass fraction of particles smaller than size dj for a collection of Ni particles of diameter di and mass mi (i = 1, 2, 3, ...... ?) is given by
Options- A.
- B.
- C.
- D.
Discuss
- 3. The grinding in a hammer crusher takes place due to the
Options- A. attrition
- B. impact
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 4. Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.
Options- A. Jaw crusher, Ball mill, Fluid energy mill
- B. Ball mill, Jaw crusher, Fluid energy mill
- C. Fluid energy mill, Jaw crusher, Ball mill
- D. Fluid energy mill, Ball mill, Jaw crusher Discuss
- 5. With increase in drum speed, in a rotary drum filter, the filtration rate
Options- A. increases
- B. increases linearly
- C. decreases
- D. is not affected Discuss
- 6. Which of the following is not a non-metalliferous mineral?
Options- A. Calcite
- B. Fluorspar
- C. Quartz
- D. Cassiterrite Discuss
- 7. For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately __________ microns.
Options- A. 5
- B. 50
- C. 500
- D. 5000 Discuss
- 8. Helical screw agitator is used for
Options- A. mixing highly viscous pastes.
- B. blending immiscible liquids.
- C. mixing liquids at very high temperature (> 250 °C).
- D. none of these. Discuss
- 9. What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?
Options- A. 16°
- B. 32°
- C. 40°
- D. 46° Discuss
- 10. Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation?
Options- A. Check plates
- B. Jaw plates
- C. Toggles
- D. Crush shaft Discuss
Mechanical Operations problems
Search Results
Correct Answer: gravity separation
Correct Answer:
Correct Answer: both (a) & (b)
Correct Answer: Jaw crusher, Ball mill, Fluid energy mill
Correct Answer: increases
Correct Answer: Cassiterrite
Correct Answer: 500
Correct Answer: mixing highly viscous pastes.
Correct Answer: 32°
Correct Answer: Jaw plates
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