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

Related Mcqs:

1. 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

2. Angled baffles are preferred in the agitation tank to control the swirling action; if the viscosity of the liquid to be mixed is about 200 poise. However, the baffle may be completely eliminated for mixing liquids having viscosity above ____________________ poise?

   A. 300
   B. 600
   C. 1000
   D. 1500

3. 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

4. The safe height (h) to diameter D. ratio (i.e., h/d) for liquid/petro fuel storage tank of capacity more than 45 kilolitres is less than _________________?

   A. 1
   B. 2
   C. 3
   D. 3.5

5. In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones; because the smaller diameter tubes ______________?

   A. Are easier to clean
   B. Are less prone to fouling
   C. Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
   D. None of these

6. The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is_________________?

   A. < 30
   B. < 7
   C. > 7 20 < 50

7. In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed _______________________ of the column diameter?

   A. 1/10-1/15th
   B. 1/5-1/10th
   C. 1/20-1/30th
   D. 1/2 to 1/4th

8. Power required for agitation depends upon the______________________?

   A. Height & properties of the liquid
   B. Agitator type & speed of agitation
   C. Size of agitator & the tank
   D. All A., B. and C.

9. The minimum shell thickness for tank ≤ 15 metres diameter is limited to _______________ mm, for reasons of elastic stability?

   A. 2
   B. 5
   C. 10
   D. 15

10. 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