Two pipe systems are said to be equivalent when_________________?

Related Mcqs:

1. The length of a pipe is 1 km and its diameter is 20 cm. If the diameter of an equivalent pipe is 40 cm, then its length is_____________________?

   A. 32 km
   B. 20 km
   C. 8 km
   D. 4 km

2. 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

3. Separation of flow occurs when_________________?

   A. the pressure intensity reaches a minimum
   B. the cross-section of a channel is reduced
   C. the boundary layer comes to rest
   D. all of the above

4. When time of closure tc = L/v0 (where L is length of pipe and v0 is speed of pressure wavE., the portion of pipe length subjected to maximum head is__________________?

   A. L/4
   B. L/3
   C. L/2
   D. L

5. The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is_______________?

   A. 1/3 R
   B. 1/2 R
   C. 2/3 R
   D. 3/4R

   where R is the radius of pipe

6. The speed of a pressure wave through a pipe depends upon________________?

   A. the length of pipe
   B. the viscosity of fluid
   C. the bulk modulus for the fluid
   D. the original head

7. The maximum thickness of boundary layer in a pipe of radius r is____________________?

   A. 0
   B. r/2
   C. r
   D. 2r

8. For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is________________?

   A. directly proportional to Reynolds number and independent of pipe wall roughness
   B. directly proportional to pipe wall roughness and independent of Reynolds number
   C. inversely proportional to Reynolds number and indpendent of pipe wall roughness
   D. inversely proportional to Reynolds number and directly proportional to pipe wall roughness

9. The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is________________?

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

   where R is radius of pipe

10. Flow at constant rate through a tapering pipe is________________?

    1. steady flow
    2. uniform flow
    3. unsteady flow
    4. non-uniform flow
    The correct answer is?

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