A pipe is generally made of circular cross-section, because a circular cross-section has the____________________?

Related Mcqs:

1. 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

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. Rivets are generally specified by the____________________?

   A. Head diameter
   B. Shank diameter
   C. Overall length
   D. None of these

4. For turbulent flow (NRe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft3/sec, ρ = fluid density, lb/ft3 μ = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches) ?

   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

5. For pipe flows, head is proportional to ______________ at constant capacity (where D = pipe diameter) ?

   A. 1/D
   B. 1/D2
   C. 1/D5
   D. D2

6. Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe is ___________________?

   A. More
   B. Less
   C. Same
   D. Either A. or B.; depends upon the I.D. of the pipe

7. 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

8. The length of straight rectangular weir used on cross-flow trays is generally ________________ the column diameter ?

   A. 0.6-0.8 times
   B. Equal to
   C. Twice
   D. 2 ft irrespective of (for column > 3 ft diameter)

9. A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the__________________?

   A. Central dished section and corner torus section
   B. Corner torus section and central dished section
   C. Central dished section and straight flange section
   D. Straight flange section and corner torus section

10. Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as ‘d’ will be__________________?

    A. d
    B. √d
    C. √(2πd)
    D. √(2d)