Coefficient of discharge for a totally submerged orifice as compared to that for an orifice discharging free is__________________?

Related Mcqs:

1. A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of________________?

   A. 3.75 m
   B. 4.0 m
   C. 4.2m
   D. 4.5m

2. The theoretical value of coefficient of contraction of a sharp edged orifice is_______________?

   A. 0.611
   B. 0.85
   C. 0.98
   D. 1.00

3. Which of the following has highest coefficient of discharge ?

   A. sharp edged orifice
   B. venturimeter
   C. Borda’s mouthpiece running full
   D. CipoUetti weir

4. The discharge of a liquid of kinematic viscosity 4 cm2/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is__________________?

   A. laminar flow
   B. transition flow
   C. turbulent flow
   D. not predictable from the given data

5. The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be_________________?

   A. 0.423 D
   B. 0.577 D
   C. 0.223 D
   D. 0.707 D

   where D is the depth of flow

6. Which of the following is used to measure the discharge ?

   A. current meter
   B. venturimeter
   C. pitot tube
   D. hotwire anemometer

7. The discharge through a V- notch varies as______________?

   A. H1/2
   B. H3’2
   C. H5/2
   D. H5’4 where H is head

8. In a Sutro weir, the discharge is proportional to________________?

   A. H1/2
   B. H3/2
   C. H5/2
   D. H

   where H is head

9. The discharge over a broad crested weir is maximum when the depth of flow is_______________?

   A. H/3
   B. H/2
   C. 2 H/5
   D. 2 H/3

   where H is the available head

10. Due to each end contraction, the discharge of rectangular sharp crested weir is reduced by________________?

    A. 5%
    B. 10%
    C. 15%
    D. 20%