At the center 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. If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm”, the pressure at a depth of 50 m below the oil surface will be_________________?

   A. 2 meters of water column
   B. 3 meters of water column
   C. 5 meters of water column
   D. 6 meters of water Column
   E. 7 meters of water column

3. The center of pressure of a surface subjected to fluid pressure is the point_______________?

   A. on the surface at which resultant pres-sure acts
   B. on the surface at which gravitational force acis
   C. at which all hydraulic forces meet
   D. similar to metacentre
   E. where pressure equivalent to hydraulic thrust will act

4. Center of pressure on an inclined plane is___________________?

   A. at the centroid
   B. above the centroid
   C. below the centroid
   D. at metacentre
   E. at center of pressure

5. The depth of the center of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is____________________?

   A. 2.4 m
   B. 3.0 m
   C. 4.0 m
   D. ”2.5 m
   E. 5.0 m

6. Center 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

7. 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

8. A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is____________________?

   A. 9,000 kg
   B. 13,500 kg
   C. 18,000 kg
   D. 27,000 kg
   E. 30,000 kg

9. During the opening of a valve in a pipe line, the flow is_________________?

   A. steady
   B. unsteady
   C. uniform
   D. laminar
   E. free vortex type

10. The pressure at which latent heat of vaporisation of water is zero, is_________________?

    A. below atmospheric pressure
    B. 1 kg/cm2
    C. 100 kg/cm2
    D. 170 kg/cm2
    E. 225.6 kg/cm2