The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is________________?

Related Mcqs:

1. 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

2. 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

3. 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

4. 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

5. 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

6. 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)

7. A fluid of kinematic viscosity 0.4 cm2/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be__________________?

   A. less than 1 m/sec
   B. 1 m/sec
   C. 1.5 m/sec
   D. 2 m/sec

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

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

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

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

10. 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