f = 16/NRe, is valid for__________________?

Related Mcqs:

1. Friction factor for a hydraulically smooth pipe at NRe = 2100 is f1. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of NRe, will_______________?

   A. Increase
   B. Decrease
   C. Remain unchanged
   D. Increase or decrease depending on the pipe material

2. Stoke’s law is valid, when NRe, p is less than_________________?

   A. 2
   B. 100
   C. 2100
   D. 700

3. What is the value of Fanning friction factor f ‘ for smooth pipe at NRe = 106 approximately ?

   A. 0.003
   B. 0.01
   C. 0.1
   D. 0.3

4. The equation relating friction factor to Reynold number, f-0.5 = 4 loge (NRe/√f)-0.4, is called the _____________ equation?

   A. Nikuradse
   B. Von-Karman
   C. Blasius
   D. Colebrook

5. Colebrook equation for friction factor in turbulent flow is given by, f-0.5 = -4 loge [(ε/D) + (1.26/NRe √F). It reduces to Nikuradse equation for a value of (ϵ/D) equal to __________________?

   A. 0
   B. 1
   C. ∞
   D. 0.5

6. The equation f-0.5 = 4.07 loge (NRe √f)-0.6 is called the ____________?

   A. Colebrook formula
   B. Von-Karman equation
   C. Fanning equation
   D. None of these

7. For the free settling of a spherical particle through a fluid, the slope of, CD-log NRe, plot is____________________?

   A. 1
   B. -1
   C. 0.5
   D. -0.5

8. A fluid (μ/ρ) = 0.01 cm2/sec is moving at critical flow condition (NRe = 2100) through a pipe of dia 3 cms. Velocity of flow is _______________ cm/sec?

   A. 7
   B. 700
   C. 7000
   D. 630

9. Plunger pumps are used for__________________?

   A. Higher pressure
   B. Slurries
   C. Viscous mass
   D. None of these

10. Air vessel provided in a reciprocating pump is for__________________?

    A. Increasing the acceleration head
    B. Making the friction in pipe uniform
    C. Decreasing the acceleration head
    D. None of these