Mechanical Operations problems
- 1. 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
Correct Answer: Both the rolls run necessarily at the same speed.
- 2. The value of 'angle of nip' is generally about
Options- A. 16°
- B. 32°
- C. 52°
- D. 64° Discuss
Correct Answer: 32°
- 3. For sizing of fine materials, the most suitable equipment is a
Options- A. trommel
- B. grizzly
- C. shaking screen
- D. vibrating screen Discuss
Correct Answer: vibrating screen
- 4. If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the
Options- A. sedimentation
- B. flocculation
- C. dispersion
- D. centrifugation Discuss
Correct Answer: centrifugation
- 5. Pick out the wrong statement.
Options- A. Recycled coarse material to the grinder by a classifier is termed as circulating load.
- B. Wear and tear in wet crushing is more than that in dry crushing of materials.
- C. Size enlargement (opposite of size reduction) is not a mechanical operation.
- D. A 'dust catcher' is simply an enlargement in a pipeline which permits the solids to settle down due to reduction in velocity of the dust laden gas. Discuss
Correct Answer: Size enlargement (opposite of size reduction) is not a mechanical operation.
- 6. Solid particles separation based on the difference in their flow velocities through fluids is termed as the
Options- A. clarification
- B. classification
- C. elutriation
- D. sedimentation Discuss
Correct Answer: classification
- 7. The capacity of a belt conveyor depends upon two factors. If one is the cross-section of the load, the other is the __________ of the belt.
Options- A. speed
- B. thickness
- C. length
- D. none of these Discuss
Correct Answer: speed
- 8. Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is
Options- A. 0.01 to 0.1
- B. 0.1 to 0.3
- C. 0.2 to 0.8
- D. 0.2 to 0.4 Discuss
Correct Answer: 0.2 to 0.8
- 9. Crushing of mineral particles is accomplished in a 'cage mill', when one or more alloy steel bars are revolved in opposite directions. It is a type of __________ mill.
Options- A. impact
- B. roll
- C. vibratory
- D. none of these Discuss
Correct Answer: impact
- 10. Sulphuric acid mist is arrested by using a __________ scrubber.
Options- A. packed wet
- B. hollow wet
- C. venturi
- D. co-current Discuss
Correct Answer: venturi
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