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?

Related Mcqs:

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

   A. 0.1
   B. 0.8
   C. 0.25
   D. 0.5

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. 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 turbulent flow (NRe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft3/sec, ρ = fluid density, lb/ft3 μ = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches) ?

   A. Di, opt = 3.9 Q0.45 ρ0.13
   B. Di, opt = 3.9 Q0.45. μ0.95
   C. Di, opt = 4.7 Q0.36. μ3.2ρ0.13
   D. Di, opt = 3 Q0.36. μ0.88

7. Tube wall thickness depends on the corrosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than _____________ mm outside diameter is generally not recommended for fouling fluids ?

   A. 16
   B. 19
   C. 28
   D. 38

8. For storing hazardous chemicals in large storage tanks, the minimum safe distance between the two tanks should range between ______________________ times the tank diameter?

   A. 1 to 1.5
   B. 2.5 to 3.5
   C. 4 to 5
   D. 6 to 8

9. In a pressure vessel containing multiple openings of various dimensions at different parts, stress concentration at the edges of the opening is maximum which becomes negligibly small beyond the area covered by ______________ times the hole diameter?

   A. Two
   B. Five
   C. Ten
   D. Twenty

10. 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