A. Temporal velocity components
B. Mean square of velocity fluctuations in the three co-ordinate directions
C. Root mean square of velocity fluctuations in the three co-ordinate directions
D. None of these
Related Mcqs:
- Isotropic turbulence occurs __________________?
A. Where there is no velocity gradient
B. At higher temperatures
C. Only in Newtonian fluids
D. None of these - In the complete turbulence zone (in rough pipes), the____________________?
A. Rough and smooth pipes have the same friction factor
B. Laminar film covers the roughness projections
C. Friction factor depends upon NRe only
D. Friction factor is independent of the relative roughness - Transition length for turbulent flow in smooth pipe is equal to _____________ times the pipe diameter?
A. 0.5
B. 5
C. 50
D. 500 - In case of turbulent flow of a Newtonian fluid in a straight pipe, the maximum velocity is equal to (where, Vavg = average fluid velocity)?
A. Vavg
B. 1.2 Vavg
C. 1.5 Vavg
D. 1.8 Vavg - Fanning friction factor is equal to (where, fB = Blasius friction factor) ?
A. fB/4
B. fB/2
C. 4fB
D. 2fB - Co-efficient of discharge (Cd) is defined as actual discharge/theoretical discharge and is equal to Cc . Cv; where Cc = Co-efficient of contraction and Cv = co-efficient of velocity. Cd of an orifice is usually about__________________?
A. 0.42
B. 0.62
C. 0.82
D. 0.98 - The terminal velocity of a particle moving through a fluid varies as dp n. The value of n is equal to _______________ in Stoke’s law regime?
A. 1
B. 0.5
C. 2
D. 1.5 - The inherent characteristic of an equal percentage valve relating flow rate ‘q’ with valve stem movement ‘x’ are described by the equation_________________?
A. dq/dx = K
B. dq/dx = K.q
C. dq/dx = K/q
D. dq/dx = Kq2 - If Blasius or Darcy friction factor is ‘f1’ then the Fanning friction factor is equal to____________________?
A. f1/4
B. 4f2
C. 2f1
D. f1/2 - Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water column in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm)?
A. H
B. 12.6 H
C. 13.6 H
D. 14.6 H
