Discussion
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- Question
rpm of a trommel at critical speed is given by (where, D = Diameter of trommel in ft)
Options- A.
- B.
- C.
- D. 76.75 D
- Correct Answer
-
- 1. For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid?
Options- A. Kozney-Karman equation
- B. Leva's equation
- C. Blake-Plummer equation
- D. none of these Discuss
- 2. Which of the following is a continuous filter?
Options- A. Plate and frame filter
- B. Cartridge filter
- C. Shell and leaf filter
- D. None of these Discuss
- 3. Critical speed of rotation, N (in rps - rotation per second) of a trammel is equal to (where, g = acceleration due to gravity = 9.81 m/sec2 and, r = radius of trammel, metre. )
Options- A.
- B.
- C.
- D.
Discuss
- 4. Percentage of drum submerged in the slurry in case of rotary drum filter is
Options- A. 3
- B. 30
- C. 85
- D. 25 Discuss
- 5. As particle size is reduced
Options- A. screening becomes progressively more difficult.
- B. screening becomes progressively easier.
- C. capacity and effectiveness of the screen is increased.
- D. none of these. Discuss
- 6. A screen is said to be blinded, when the
Options- A. oversizes are present in undersize fraction.
- B. undersizes are retained in oversize fraction.
- C. screen is plugged with solid particles.
- D. screen capacity is abruptly increased. Discuss
- 7. Trommels are revolving screens which normally operate in the range of __________ rpm.
Options- A. 1 - 2
- B. 15 - 20
- C. 40 - 50
- D. 60 - 75 Discuss
- 8. Maximum size reduction in a fluid energy mill is achieved by
Options- A. compression
- B. interparticle attrition
- C. cutting
- D. impact Discuss
- 9. The process opposite to 'dispersion' is termed as the
Options- A. flocculation
- B. sedimentation
- C. filtration
- D. none of these. Discuss
- 10. Which of the following minerals is not subjected to magnetic separation method?
Options- A. Rutile
- B. Galena
- C. Chromite
- D. Siderite Discuss
Mechanical Operations problems
Search Results
Correct Answer: Kozney-Karman equation
Correct Answer: None of these
Correct Answer:
Correct Answer: 30
Correct Answer: screening becomes progressively more difficult.
Correct Answer: screen is plugged with solid particles.
Correct Answer: 15 - 20
Correct Answer: interparticle attrition
Correct Answer: flocculation
Correct Answer: Galena
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