Related Mcqs:

1. Rotary driers are most economically designed for the number of heat transfer units (HTU) from _________________?

   A. 0.01 to 1
   B. 1.5 to 2.5
   C. 5 to 10
   D. 10 to 20

2. Normally, the length to diameter ratio of rotary dryers varies from 4 to 10 and for its economic operation; the number of transfer units (NTU) for such dryers varies from ?

   A. 1.5-2.5
   B. 3.5-5.5
   C. 7.5-10.0
   D. 10-15

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. 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. 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

6. 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

7. Height of the flights in the rotary drier is in the range of___________________?

   A. 0.08 to 0.12 d
   B. 0.02 to 0.05 d
   C. 0.2 to 0.5 d
   D. 0.5 to 0.6 d

8. Hold up of material in a operating rotary drier is in the range of___________________?

   A. 0.05 to 0.15
   B. 0.25 to 0.50
   C. 0.5 to 0.8
   D. 0.8 to 0.9

9. Pressure differential maintained across a continuous rotary vacuum filter is in the range of _______________ mm Hg column?

   A. 50 to 100
   B. 100 to 150
   C. 250 to 500
   D. 600 to 700

10. Slope of counter-current flow rotary drier is in the range of ____________ meter/metre?

    A. 0 to 0.08
    B. 0 to 0.8
    C. 0 to 1.5
    D. 0 to 2.2