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

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. The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5th the I.D. of the shell. Which of the following is not a function of the baffles ?

   A. To increase the residence time of shell side fluid
   B. To provide support to the tube bundle
   C. To reduce the induced vibration in the tubes
   D. To increase the tube side heat transfer co-efficient by inducing turbulence

4. In sieve plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally ______________ times the hole diameter to give the required hole area?

   A. 0.5 to 1.5
   B. 2.5 to 4.0
   C. 5 to 10
   D. 10 to 15

5. 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

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. 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

9. 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

10. 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