351. f = 16/NRe, is valid for
Turbulent flow
Laminar flow through an open channel
Steady flow
None of these
✅ The correct answer is option D.
Fluid Mechanics MCQs
352. Air vessel provided in a reciprocating pump is for
Increasing the acceleration head
Making the friction in pipe uniform
Decreasing the acceleration head
None of these
✅ The correct answer is option B.
353. The ratio of average fluid velocity to the maximum velocity in case of laminar flow of a Newtonion fluid in a circular pipe is
0.5
1
2
0.66
✅ The correct answer is option A.
354. In the complete turbulence zone (in rough pipes), the
Rough and smooth pipes have the same friction factor
Laminar film covers the roughness projections
Friction factor depends upon NRe only
Friction factor is independent of the relative roughness
✅ The correct answer is option D.
355. The ratio of inertial forces to elastic forces is called the __________ number.
Reynolds
Mach
Euler
Weber
✅ The correct answer is option B.
356. Hot wire anemometer is used to measure the
Velocity of liquids
Temperature of liquids
Velocity of gases
Pressure of liquids
✅ The correct answer is option C.
357. A Newtonion fluid is that
Which follows Newton
Which needs a minimum shear, before it starts deforming
For which shear & deformation are related as T = μ ∂u/∂y
None of these
✅ The correct answer is option C.
358. The unit of bulk modulus of elasticity for a liquid in S.I. unit is
N
N/m
N/m²
N/m³
✅ The correct answer is option C.
359. Power required by a centrifugal pump is proportional to (where, D = diameter, N = r.p.m)
N²D³
ND²
N²D
N³D⁵
✅ The correct answer is option D.