Discussion
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- Question
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.
- Correct Answer
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- 1. Percentage of drum submerged in the slurry in case of rotary drum filter is
Options- A. 3
- B. 30
- C. 85
- D. 25 Discuss
- 2. 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
- 3. The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant __________ filtration.
Options- A. rate
- B. pressure
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 4. What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls?
Options- A. 0.5
- B. 1.0
- C. 2.76
- D. 0.66 Discuss
- 5. In a roll crusher, both the rolls
Options- A. have the same diameter.
- B. are rotated towards each other.
- C. run either at the same or different speeds.
- D. all (a), (b) and (c). Discuss
- 6. 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
- 7. 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
- 8. 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 Discuss
- 9. 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
- 10. 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
Mechanical Operations problems
Search Results
Correct Answer: 30
Correct Answer: screening becomes progressively more difficult.
Correct Answer: both (a) & (b)
Correct Answer: 0.66
Correct Answer: all (a), (b) and (c).
Correct Answer: None of these
Correct Answer: Kozney-Karman equation
Correct Answer:
Correct Answer: screen is plugged with solid particles.
Correct Answer: 15 - 20
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