Discussion
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- Question
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
- Correct Answer
- Jaw plates
- 1. 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
- 2. 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
- 3. 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
- 4. Which of the following is not a non-metalliferous mineral?
Options- A. Calcite
- B. Fluorspar
- C. Quartz
- D. Cassiterrite Discuss
- 5. __________ 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 Discuss
- 6. Mixing of plastic solids is generally facilitated by
Options- A. dispersion
- B. mastication
- C. kneading
- D. none of these Discuss
- 7. For raschig rings, the sphericity is
Options- A. 0.5
- B. 1
- C. <1
- D. 3 Discuss
- 8. Which of the following is not a wet classifier?
Options- A. Sharpies supercentrifuge
- B. Hydrocyclones
- C. Dorr Oliver rake classifier
- D. None of these Discuss
- 9. The mechanism of size reduction by a hammer mill is by impact and attrition between the
Options- A. grinding element & the housing.
- B. feed particles.
- C. both (a) and (b).
- D. neither (a) nor (b). Discuss
- 10. Which of the following must be stored in silos and not in open yard?
Options- A. Coke breeze
- B. High V.M. bituminous coal
- C. Sand
- D. None of these Discuss
Mechanical Operations problems
Search Results
Correct Answer: 32°
Correct Answer: mixing highly viscous pastes.
Correct Answer: 500
Correct Answer: Cassiterrite
Correct Answer: Pebble
Correct Answer: kneading
Correct Answer: <1
Correct Answer: None of these
Correct Answer: both (a) and (b).
Correct Answer: High V.M. bituminous coal
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