At the centre line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be_______________?

Related Mcqs:

1. To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than_______________?

   A. 2.4 m above the hydraulic gradient
   B. 6.4 m above the hydraulic gradient
   C. 10.0 m above the hydraulic gradient
   D. 5.0 above the hydraulic gradient
   E. none of the above

2. For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of___________________?

   A. 100 cm
   B. 120 cm
   C. 140 cm
   D. 160 cm

3. The self-cleansing velocity of water flowing through pipe lines, is___________________ ?

   A. 2 metres/sec
   B. 1 metre/sec
   C. 0.5 metre/sec
   D. 0.25 metre/sec

4. If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is__________________?

   A. 1 in 60
   B. 1 in 100
   C. 1 in 120
   D. None of these

5. If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is___________________?

   A. 1 in 60
   B. 1 in 100
   C. 1 in 120
   D. None of these

6. If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is________________?

   A. 1 in 60
   B. 1 in 100
   C. 1 in 120
   D. None of these

7. The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called ____________________?

   A. Inverted syphon
   B. Depressed sewer
   C. Sag pipe
   D. all of these

8. The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is_________________?

   A. 1 in 100 upward
   B. 1 in 500 upward
   C. 1 in 100 downward
   D. 1 in 503 upward

9. Centre of pressure compared to e.g. is______________?

   A. above it
   B. below it
   C. at same point
   D. above or below depending on area of body
   E. none of the above

10. A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?

    A. 1 : 5
    B. 1 : 2.5
    C. 1 :25
    D. 1:V5″
    E. 1 : 53/2