Discussion
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- Question
Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm)?
Options- A. Trough washer
- B. Baum jig washer
- C. Spiral separator
- D. Froth floatation
- Correct Answer
- Froth floatation
- 1. Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.
Options- A. metalliferrous ores
- B. non-metallic ores
- C. basic slags
- D. asbestos & mica Discuss
- 2. Which of the following is not a part of the Blake jaw crusher?
Options- A. Hanger
- B. Check plates
- C. Toggles
- D. Pitman Discuss
- 3. __________ is the most commonly used 'filter aid'.
Options- A. Diatomaceous earth
- B. Fuller's earth
- C. Vermiculite
- D. Semi-plastic clay Discuss
- 4. Sulphuric acid mist is arrested by using a __________ scrubber.
Options- A. packed wet
- B. hollow wet
- C. venturi
- D. co-current Discuss
- 5. 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
- 6. Gravity settling process is not involved in the working of a
Options- A. hydrocyclone
- B. classifier
- C. dorr-thickener
- D. sedimentation tank Discuss
- 7. Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ?= density of particles)
Options- A. m/? . Vp
- B. m . ?/Vp
- C. m . Vp/?
- D. Vp/m . ? Discuss
- 8. Which of the following mineral dressing operations is termed as 'comminution'?
Options- A. Panning
- B. Spiralling
- C. Tabling
- D. None of these Discuss
- 9. Which of the following relationships between co-efficinet of friction (?) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct?
Options- A. ? > tan ?
- B. ? ? tan ?
- C. ? > tan 2?
- D. ? ? tan ? Discuss
- 10. Two particles are called to be equal settling, if they are having the same.
Options- A. size.
- B. specific gravity.
- C. terminal velocities in the same fluid & in the same field of force.
- D. none of these. Discuss
Mechanical Operations problems
Search Results
Correct Answer: metalliferrous ores
Correct Answer: Hanger
Correct Answer: Diatomaceous earth
Correct Answer: venturi
Correct Answer: impact
Correct Answer: hydrocyclone
Correct Answer: m/? . Vp
Correct Answer: None of these
Correct Answer: ? ? tan ?
Correct Answer: terminal velocities in the same fluid & in the same field of force.
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