A. 2
B. 100
C. 2100
D. 700
Related Mcqs:
- 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 - f = 16/NRe, is valid for__________________?
A. Turbulent flow
B. Laminar flow through an open channel
C. Steady flow
D. None of these - The Navier-Stokes equation deals with the law of conservation of___________________?
A. Mass
B. Energy
C. Both A. & B.
D. Momentum - Navier-Stokes equation is useful in the analysis of _____________ fluid flow problems?
A. Non-viscous
B. Viscous
C. Turbulent
D. Rotational - 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 - 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 - 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 - 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 - 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 - 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
