Hydraulic diameter for non-circular ducts is equal to ___________ times the area of flow divided by the perimeter?

Related Mcqs:

1. The ratio of the hydraulic radius to the diameter of the channel, for maximum mean velocity of flow in a circular channel, in open channel flow is_________________?

   A. 0.3
   B. 0.9
   C. 0.03
   D. 0.66

2. Hydraulic mean depth (Dm) for a circular pipe of diameter ‘D’ flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum ?

   A. Flow rate
   B. Mean velocity
   C. Both ‘a’ & ‘b’
   D. Neither ‘a’ nor ‘b’

3. Which of the following quantities are computed by using the hydraulic radius for noncircular ducts ?

   A. Velocity and relative roughness
   B. Head loss and velocity
   C. Reynold number, relative roughness and head loss
   D. Reynolds number and friction factor

4. The maximum discharge through a circular channel takes place, when the depth of the fluid flow is ______________ times the pipe diameter?

   A. 0.25
   B. 0.5
   C. 0.66
   D. 0.95

5. In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of___________________?

   A. Relative roughness
   B. Absolute roughness
   C. Friction co-efficient for flows at equal Reynold number
   D. All A., B. & C.

6. The ratio of the depth of flow to the diameter of the channel for maximum discharge in a circular channel in open channel flow is________________?

   A. 0.1
   B. 0.55
   C. 0.95
   D. 1.85

7. A hydraulic press has a ram of 10 cms in diameter and a plunger of 1 cm in diameter. The force required on the plunger to raise a weight of 10 tons on the ram is _____________ kg?

   A. 10
   B. 100
   C. 1000
   D. 10000

8. Transition length for turbulent flow in smooth pipe is equal to _____________ times the pipe diameter?

   A. 0.5
   B. 5
   C. 50
   D. 500

9. If ‘x’ is the depth of flow in an open channel of large width, then the hydraulic radius is equal to________________?

   A. x
   B. x/2
   C. x/3
   D. 2x/3

10. The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is_____________________?

    A. 0.5
    B. 1
    C. 1.5
    D. 2