logo

CuriousTab

CuriousTab

Discussion

Home ‣ Chemical Engineering ‣ Mechanical Operations Comments
  • Question

  • For a cyclone of diameter 0.2 m with a tangential velocity of 15 m/s at the wall, the separation factor is


  • Options
  • A. 2250
  • B. 1125
  • C. 460
  • D. 230

  • Correct Answer
  • 230 

    • Mechanical Operations problems

    Search Results

    • 1. For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as

    • Options
    • A. d
    • B. d
    • C. d2
    • D. 1/d
      • Discuss
    • 2. Sphericity of pulverised coal is

    • Options
    • A. 1
    • B. <1
    • C. >1
    • D. ?
      • Discuss
    • 3. The important dimensional group involved in the power requirement calculation in mixing operation is the __________ number.

    • Options
    • A. Reynold's
    • B. Froude
    • C. both (a) & (b)
    • D. neither (a) nor (b)
      • Discuss
    • 4. At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied:
      Po = ?/?N3 D5 : Power number
      Re = ? N D2/?: Reynold's number
      N is the impeller rotational speed, and D is the impeller diameter.

    • Options
    • A. Po ? Re-1.0
    • B. Po ? Re0.0
    • C. Po ? Re0.5
    • D. Po ? Re1.0
      • Discuss
    • 5. Critical Speed (Nc) of a ball mill is given by(where R1 and R2 are radii of ball mill and the ball respectively).

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. Grinding efficiency of a ball mill is of the order of __________ percent.

    • Options
    • A. 1-5
    • B. 40-50
    • C. 75-80
    • D. 90-95
      • Discuss
    • 7. Filtration capacity of a rotary drum vacuum filter depends upon the

    • Options
    • A. cake thickness.
    • B. characteristics of the feed slurry.
    • C. both (a) & (b).
    • D. neither (a) nor (b).
      • Discuss
    • 8. For efficient grinding, ball mills must be operated

    • Options
    • A. at a speed less than the critical speed.
    • B. at a speed more than the critical speed.
    • C. at a speed equal to the critical speed.
    • D. with minimum possible small balls.
      • Discuss
    • 9. About 2-3 hp, power per gallon of a thin liquid provides vigrous agitation in an agitator. 'Power number' in agitation is given by

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 10. The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be

    • Options
    • A. 0.5 Wi
    • B. Wi
    • C. 1.34 Wi
    • D. 3.34 Wi
      • Discuss

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.