If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be___________________?

Related Mcqs:

1. The hydraulic grade line is_________________?

   A. always above the centre line of pipe
   B. never above the energy grade line
   C. always sloping downward in the direction of flow
   D. all of the above

2. 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

3. For laminar flow in circular pipes, the Darcy’s friction factor f is equal to_________________?

   A. 16/Re
   B. 32/ Re
   C. 64/ Re
   D. none of the above where R,, is Reynolds number

4. The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is_______________?

   A. 1/2
   B. 2/3
   C. 3/2
   D. 2

5. 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

6. A closed tank containing water is moving in a horizontal direction along a straight line at a constant speed. The tank also contains a steel ball and a bubble of air. If the tank is decelerated horizontally, then________________?

   1. the ball will move to the front
   2. the bubble will move to the front
   3. the ball will move to the rear
   4. the bubble will move to the rear
   Find out which of the above statements are correct ?

   A. (1) and (2)
   B. (1)and(4)
   C. (2) and (3)
   D. (3) and (4)

7. The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is__________________?

   A. 0.40 cm
   B. 0.20 cm
   C. 0.10 cm
   D. 0.05 cm

   Assume that boundary layer is entirely laminar

8. The value of friction factor ‘f’ for smooth pipes for Reynolds number 106 is approximately equal to________________?

   A. 0.1
   B. 0.01
   C. 0.001
   D. 0.0001

9. Two pipes of same length and diameters d and 2d respectively are connected in series. The diameter of an equivalent pipe of same length is________________?

   A. less than d
   B. between d and 1.5 d
   C. between 1.5 d and 2d
   D. greater than 2d

10. The major loss of energy in long pipes is due to_______________?

    A. sudden enlargement
    B. sudden contraction
    C. gradual contraction or enlargement
    D. friction