Discussion
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- Question
A __________ mixer resembles a ball mill without balls.
Options- A. banbery
- B. pug mill
- C. tumbling
- D. pan
- Correct Answer
- tumbling
- 1. Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)
Options- A. 0.5 D
- B. D
- C. 1.5 D
- D. 2 D Discuss
- 2. Which is a secondary crusher for a hard & tough stone?
Options- A. Jaw crusher
- B. Cone crusher
- C. Impact crusher
- D. Toothed roll crusher Discuss
- 3. Size measurement of ultrafine particles can be best expressed in terms of
Options- A. centimetre
- B. screen size
- C. micron
- D. surface area per unit mass Discuss
- 4. Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for
Options- A. British standard screens.
- B. German standard screens (DIN 1171) etc.
- C. American standard screens (ASTM and Tyler standard screens).
- D. all (a), (b) and (c). Discuss
- 5. __________ mills are termed as impactors.
Options- A. Hammer
- B. Cage
- C. Rolling-compression
- D. none of these Discuss
- 6. Tank filter (e.g., Nutsch filter) is
Options- A. a high pressure filter.
- B. a continuous filter.
- C. used for small scale filtration work.
- D. a leaf filter. Discuss
- 7. Cyclones are used primarily for separating
Options- A. solids
- B. solids from fluids
- C. liquids
- D. solids from solids Discuss
- 8. Molten ammonium nitrate is mixed with ground limestone in fertilizer plant in a
Options- A. pug mill
- B. mixer-extruder
- C. banbury mixer
- D. muller mixer Discuss
- 9. In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.
Options- A. 35
- B. 50
- C. 70
- D. 85 Discuss
- 10. Reciprocating screens are normally inclined at an angle of 5° with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the screening of the
Options- A. light metal powder down upto 4 meshsize.
- B. dry chemicals.
- C. heavy tonnages of rocks or gravel.
- D. powdered food & granular materials. Discuss
Mechanical Operations problems
Search Results
Correct Answer: D
Correct Answer: Cone crusher
Correct Answer: surface area per unit mass
Correct Answer: all (a), (b) and (c).
Correct Answer: Hammer
Correct Answer: used for small scale filtration work.
Correct Answer: solids from fluids
Correct Answer: pug mill
Correct Answer: 50
Correct Answer: heavy tonnages of rocks or gravel.
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