In the design of a paddle agitator, the ratio (paddle dia/tank dia) is normally taken as___________________?

Related Mcqs:

1. Multiple blade paddle agitator is used for mixing high viscosity liquids/paste in which the paddle diameter is commonly 0.8 times the tank diameter. However, the width of the blade is in the range of ______________ times the paddle diameter?

   A. 0.1 to 0.25
   B. 0.3 to 0.5
   C. 0.5 to 0.6
   D. 0.65 to 0.80

2. The ratio, (propeller agitator dia/tank dia) is normally taken as____________________?

   A. 0.15-030
   B. 0.5-0.65
   C. 0.75-0.85
   D. 0.60-0.90

3. The diameter of a propeller agitator used in agitation tank ranges from ____________ percent of the tank diameter and its peripheral speed is normally 300 to 500 metres/minute ?

   A. 5 to 10
   B. 15 to 30
   C. 40 to 50
   D. 55 to 75

4. Speed of industrial paddle agitator ranges from _____________ rpm?

   A. 1 to 5
   B. 20 to 100
   C. 500 to 750
   D. 1000 to 2000

5. Baffle width is normally taken as ______________ times the tank diameter?

   A. 0.1-0.12
   B. 0.4-0.5
   C. 0.45-0.6
   D. 0.2-0.45

6. For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for dia of the tank in question), the thickness of the courses of shell_________________?

   A. Decreases upwards
   B. Increases upwards
   C. Remains same throughout
   D. May decrease or increase upwards depending upon whether vacuum or positive pressure
   would be maintained inside the shell

7. The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the _______________ stress?

   A. Working
   B. Damaging
   C. Allowable
   D. None of these

8. The minimum plate spacing in most of the petroleum refinery distillation columns (of dia > 3 ft) is normally _____________ inches?

   A. 6
   B. 12
   C. 18
   D. 36

9. Poisson’s ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poisson’s ratio for structural and pressure vessel steel may be taken as ____________________?

   A. 0.01
   B. 0.3
   C. 0.75
   D. 0.95

10. The approximate liquid depth in an agitation tank is equal to (where, d = tank diameter)_________________?

    A. 0.5 d
    B. 0.75 d
    C. d
    D. 2 d