When the velocity distribution is uniform over the cross-section, the correction factor for momentum is__________________?

Related Mcqs:

1. If velocity is zero over l/3rd of a cross-section and is uniform over remaining 2/3rd of the cross-section, then the correction factor for kinetic energy is__________________?

   A. 4/3
   B. 3/2
   C. 9/4
   D. 27/8

2. If the velocity is zero over half of the cross-sectional area and is uniform over the remaining half, then the momentum correction factor is_______________?

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

3. 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

4. Least possible value of correction factor for________________?

   1. kinetic energy is zero
   2. kinetic energy is 1
   3. momentum is zero
   4. momentum is 1

   The correct statements are?

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

5. 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

6. For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be_________________?

   A. 300
   B. 337.5
   C. 600
   D. 675

7. The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is_________________?

   A. d > m > e
   B. d > e > m
   C. e > m > d
   D. e > d > m

8. A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be________________?

   A. 1 m
   B. 10m
   C. 100m
   D. none of the above

9. 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

10. 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