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

3. For turbine agitator, the impeller diameter is about_________________?

   A. 0.3 to 0.5 d
   B. 0.1 to 0.2 d
   C. 0.65 to 0.85 d
   D. 0.95 d

4. 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

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

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

6. 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

7. 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

8. 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

9. In case of bubble cap distillation column of diameter greater than 1.2 metres, the cap diameter is roughly about _______________ cms?

   A. 10
   B. 20
   C. 30
   D. 35

10. For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is_________________?

    A. d1/(d1 + d2)
    B. d2/(d1 + d2)
    C. (d1 + d2)/d1
    D. (d1 + d2)/d2