Mechanical Operations problems
- 1. Close circuit grinding by a ball mill with air sweeping employs a
Options- A. classifier.
- B. cyclone separator between mill & classifier.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
Correct Answer: both (a) & (b).
- 2. Gelatinous solid (which plug the septum) can be filtered by a __________ filter.
Options- A. sparkler
- B. plate and frame
- C. vacuum leaf
- D. precoat Discuss
Correct Answer: precoat
- 3. Sorting classifiers employing differential settling methods for separation of particles make use of the differences in their
Options- A. particle sizes
- B. densities
- C. terminal velocities
- D. none of these Discuss
Correct Answer: terminal velocities
- 4. Toothed roll crushers achieve size reduction by
Options- A. tearing (shear) and compression.
- B. impact and attrition.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
Correct Answer: both (a) & (b).
- 5. Which of the following oxides is not present in hematite iron ore?
Options- A. Titanium oxide
- B. Calcium oxide
- C. Cobalt oxide
- D. Manganese oxide Discuss
Correct Answer: Cobalt oxide
- 6. Choke crushing (in case of a Jaw crusher) compared to free crushing
Options- A. results in increased capacity.
- B. consumes less power.
- C. consumes more power.
- D. both (a) and (c). Discuss
Correct Answer: consumes more power.
- 7. Traces of liquid tar fog present in coke oven gas is separated using
Options- A. electrostatic precipitator
- B. cyclone separator
- C. strainer
- D. none of these Discuss
Correct Answer: electrostatic precipitator
- 8. In constant pressure filtration,
Options- A. resistance decreases with time
- B. rate of filtration is constant
- C. rate of filtration increases with time
- D. rate of filtration decreases with time Discuss
Correct Answer: rate of filtration decreases with time
- 9. Angle of nip of the crushing rolls does not depend upon the
Options- A. diameter of the rolls
- B. speed of the rolls
- C. product size
- D. feed size Discuss
Correct Answer: speed of the rolls
- 10. Shell and leaf filter as compared to plate and frame filter
Options- A. entails less labor cost.
- B. facilitates filtration under higher pressure.
- C. provides more effective washing.
- D. all (a), (b) & (c) Discuss
Correct Answer: all (a), (b) & (c)
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