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- Question
Which of the following is not categorised as a "mechanical operation"?
Options- A. Agitation
- B. Filtration
- C. Size enlargement
- D. Humidification
- Correct Answer
- Humidification
- 1. Balls for ball mills are never made of
Options- A. forged/cast steel
- B. lead
- C. cast iron
- D. alloy steel Discuss
- 2. Froth floatation is the most suitable for treating
Options- A. iron ores
- B. sulphide ores
- C. quartzite
- D. none of these Discuss
- 3. Pick out the correct statement:
Options- A. Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products.
- B. The operating cost of shaking screen is more than that of a vibrating screen.
- C. Screen capacity does not depend upon the specific gravity of the minerals.
- D. Asphalt is best crushed using toothed roll crusher. Discuss
- 4. In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the
Options- A. square root of the velocity.
- B. square of the viscosity.
- C. filtration time only.
- D. washing time only. Discuss
- 5. Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of
Options- A. bronze
- B. stainless steel
- C. flint or porcelain
- D. concrete Discuss
- 6. In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is
Options- A. 4
- B. 1/4
- C. 1
- D. 1/2 Discuss
- 7. In case of a hammer crusher,
Options- A. crushing takes place by impact breaking.
- B. maximum acceptable feed size is 30 cms.
- C. reduction ratio can be varied by adjusting the distance from cage to hammers.
- D. all (a), (b) and (c). Discuss
- 8. Pick out the wrong statement pertaining to the roll crushers.
Options- A. Maximum feed size determines the required roll diameter.
- B. For hard material's crushing, the reduction ratio should not exceed 4.
- C. Both the rolls run necessarily at the same speed.
- D. Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced. Discuss
- 9. The value of 'angle of nip' is generally about
Options- A. 16°
- B. 32°
- C. 52°
- D. 64° Discuss
- 10. For sizing of fine materials, the most suitable equipment is a
Options- A. trommel
- B. grizzly
- C. shaking screen
- D. vibrating screen Discuss
Mechanical Operations problems
Search Results
Correct Answer: lead
Correct Answer: sulphide ores
Correct Answer: Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products.
Correct Answer: square root of the velocity.
Correct Answer: flint or porcelain
Correct Answer: 1/4
Correct Answer: all (a), (b) and (c).
Correct Answer: Both the rolls run necessarily at the same speed.
Correct Answer: 32°
Correct Answer: vibrating screen
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