Related Mcqs:

1. For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by____________________?

   A. Di, opt = 3 Q0.36 ρ0.18
   B. Di, opt = 3.9 Q0.45 ρ0.23
   C. Di, opt = 7.6 Q0.36 ρ0.9
   D. Di, opt = 3 Q0.36 ρ1.86 μ0.08

2. Optimum economic pipe diameter for fluid flow is determined by the____________________?

   A. Viscosity of the fluid
   B. Density of the fluid
   C. Total cost considerations (pumping cost plus fixed cost of the pipe)
   D. None of these

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. The equivalent diameter for fluid flow through a channel of constant non-circular cross section of area ‘A’ is given by (where, P = perimeter of the channel in contact with the fluid) ?

   A. 4 A/P
   B. A/P
   C. 4 P/A
   D. √A

5. Friction factor for turbulent flow in a new pipe is given by____________________?

   A. f = 16/NRe
   B. f = 0.04/(NRe)0.16
   C. f = 0.22 NRe
   0.5
   D. f = 25/NRe

6. 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

7. For a given fluid, as the pipe diameter increases, the pumping cost ____________________?

   A. Decreases
   B. Increases
   C. Remain unaffected
   D. May increase or decrease depending upon whether the fluid is Newtonian or non-Newtonian

8. Tube side pressure drop in a 1-2 heat exchanger (for turbulent flow of fluids through the tubes) is about __________ times, that in a 1-1 heat exchanger having the same size & number of tubes and operated at the same liquid flow rate ?

   A. 2
   B. ½
   C. 4
   D. 8

9. 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

10. 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