For turbine agitator, the impeller diameter is about_________________?

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. To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of_________________?

   A. (1.2)3/2
   B. (1.2)3/5
   C. (1.2)2/3
   D. (1.2)5/3

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. n the agitators, the power required will be changed with the increase of diameter of agitator D. as ____________________?

   IA. D2
   B. D5
   C. D
   D. D9

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. Speed of industrial paddle agitator ranges from _____________ rpm?

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

7. 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

8. 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

9. In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube) ?

   A. 4(P2 – πd2/4)/πd
   B. (P2 – rd2/4)/rd
   C. 4P2/πd
   D. πd/4P2

10. For given number of passes, pitch & tube diameter, the maximum number of tubes that can be accommodated in a shell of tripled inside diameter will be ____________ times?

    A. About 9
    B. Considerably more than 9
    C. Considerably less than 9
    D. About 3