311. For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poisseule equation predicts the volumetric flow rate to be proportional to
R
R2
R4
R0.5
✅ The correct answer is option C.
Fluid Mechanics MCQs
312. What is the value of co-efficient of discharge for square edged circular orifice (for β = 0.3 to 0.5)?
0.61 – 0.63
0.5 – 0.75
0.75 – 0.90
0.35 – 0.55
✅ The correct answer is option A.
313. A fluid which has a linear relationship between the magnitude of applied shear-stress and the resulting rate of deformation is called a/an __________ fluid.
Newtonion
Non-Newtonion
Ideal
Incompressible
✅ The correct answer is option A.
314. The discharge co-efficient for an orificemeter does not depend upon the
Pipe length
Ratio of pipe diameter to orifice diameter
Type of orifice & the Reynolds number
Pipe diameter
✅ The correct answer is option A.
315. In fluid flow, the stagnation point is defined as a point, where the __________ is zero.
Flow velocity
Pressure
Total energy
All of the above
✅ The correct answer is option A.
316. The terminal velocity of a particle moving through a fluid varies as dpn. The value of n is equal to __________ in Stoke’s law regime.
1
0.5
2
1.5
✅ The correct answer is option C.
317. If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V= fluid velocity f = friction factor).
Q = Q₁ + Q₂ + Q₃
V₁ = V₂ = V₃
Q₁ = Q₂ = Q₃
F = f₁ + f₂ + f₃
✅ The correct answer is option A.
318. The effect of solid boundary on the fluid flow is confined to the boundary layer, except for fluids
Having high viscosities
Moving at low velocities
Both A and B
Neither A nor B
✅ The correct answer is option C.
319. In open channel flow in a rectangular channel, the ratio between the critical depth and the initial depth, when a hydraulic jump occurs is
0.5
0.84
1.84
1.25
✅ The correct answer is option C.
320. A globe valve is the most suitable for applications, in which
Fluid flow control is required
Fluid contains dispersed solid particles
Valve is required to be either fully open or fully closed
One way flow is required
✅ The correct answer is option A.