A. Di, opt = 3.9 Q0.45 ρ0.13
B. Di, opt = 3.9 Q0.45. μ0.95
C. Di, opt = 4.7 Q0.36. μ3.2ρ0.13
D. Di, opt = 3 Q0.36. μ0.88
Related Mcqs:
- 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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
