Mechanical Operations problems
- 1. Which of the following screens has the maximum capacity?
Options- A. Grizzlies
- B. Trommels
- C. Shaking screen
- D. Vibrating screen Discuss
Correct Answer: Vibrating screen
- 2. A propeller agitator
Options- A. produces mainly axial flow.
- B. is used for mixing high viscosity pastes.
- C. runs at very slow speed (2 rpm).
- D. all (a), (b) and (c) Discuss
Correct Answer: produces mainly axial flow.
- 3. Removal of activated carbon from glycerine is done by
Options- A. plate and frame filter
- B. rotary vacuum filter
- C. batch basket centrifuge
- D. none of these Discuss
Correct Answer: plate and frame filter
- 4. Which of the following is not used as a surface active agent in a flocculation operation?
Options- A. Sodium silicate
- B. Quartz
- C. Lime
- D. Alumina Discuss
Correct Answer: Quartz
- 5. Which of the following is not used as filter aid?
Options- A. Asbestos
- B. Diatomaceous earth
- C. Purified wood cellulose
- D. Rice husk Discuss
Correct Answer: Rice husk
- 6. Which of the following is a fine crusher?
Options- A. Blake jaw crusher
- B. Gyratory crusher
- C. Toothed roll crusher
- D. Dodge jaw crusher Discuss
Correct Answer: Toothed roll crusher
- 7. Carbon black is pulverised in a
Options- A. hammer crusher
- B. ball mill
- C. roll crusher
- D. gyratory crusher Discuss
Correct Answer: ball mill
- 8. Limestone is normally crushed in a
Options- A. roll crusher
- B. hammer crusher
- C. ball mill
- D. tube mill Discuss
Correct Answer: hammer crusher
- 9. What is the reduction ratio in a fine crushing operation having following feed and product sizes?
Options- A. 0.5
- B. 2
- C. 5
- D. 10 Discuss
Correct Answer: 2
- 10. Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripherial velocity, m/sec. W = width of rolls, m Dr = distance between rolls ? = density of material to be crushed, kg/m3 here, V =?N.D where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m)
Options- A. 3.6 V.W.Dr.?
- B. 3.6 V.W. ?
- C. 3.6 W.Dr.?
- D. 3.6 V.W.Dr/? Discuss
Correct Answer: 3.6 V.W.Dr.?
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