Mechanical Operations problems
- 1. 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
Correct Answer: mixing highly viscous pastes.
- 2. 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
Correct Answer: 32°
- 3. 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
Correct Answer: Jaw plates
- 4. Mixing of plastic solids is generally facilitated by
Options- A. dispersion
- B. mastication
- C. kneading
- D. none of these Discuss
Correct Answer: kneading
- 5. For raschig rings, the sphericity is
Options- A. 0.5
- B. 1
- C. <1
- D. 3 Discuss
Correct Answer: <1
- 6. 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
Correct Answer: None of these
- 7. 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
Correct Answer: both (a) and (b).
- 8. 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
Correct Answer: High V.M. bituminous coal
- 9. Handling of ashes and similar materials can be done best by a __________ conveyor.
Options- A. flight
- B. drag or slat
- C. belt
- D. ribbon. Discuss
Correct Answer: drag or slat
- 10. __________ baffles are provided in ball mills.
Options- A. Horizontal
- B. No
- C. Only two
- D. None of these Discuss
Correct Answer: Horizontal
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