Unsteady through unchanged cross-section
Steady through changing cross-section
Steady and the cross-section is unchanged
Unsteady and the cross-section is changed
✅ The correct answer is option C.
Fluid Mechanics MCQs
132. Hydraulic mean depth (Dm) for a circular pipe of diameter ‘D’ flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum
Flow rate
Mean velocity
Both A & B
Neither A nor B
✅ The correct answer is option B.
133. The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10⁻⁶m²/s).
24000
24
0.24
0.44
✅ The correct answer is option D.
134. N²Re/NFr is called the __________ number.
Brinkman
Galileo
Archimedes
Euler
✅ The correct answer is option B.
135. The velocity profile exhibited by laminar flow of Newtonion fluids is such that the velocity distribution w.r.t. radius of the circular pipe is a/an __________ with the apex at the centre line of the pipe.
Hyperbola
Parabola
Semi-circle
Semi-ellipse
✅ The correct answer is option B.
136. Creeping flow around a sphere is defined, when particle Reynolds number is
< 2100
< 0.1
> 2.5
< 500
✅ The correct answer is option B.
137. The vent valve provided in a liquid handling centrifugal pump is
Generally a needle valve
Used to release any gases that might be vapour locking the pump
Helpful in easy removal of samples
All of the above
✅ The correct answer is option D.
138. Rubber latex is an example of a __________ .fluid.
Pseudoplastic
Bingham plastic
Dilatent
Newtonion
✅ The correct answer is option A.
139. A Bingham fluid of viscosity μ = 10 Pa.s and yield stress, τ₀ = 10 KPa, is shared between flat parallel plates separated by a distance of 10⁻³ m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is
10 KPa
20 KPa
30 KPa
40 KPa
✅ The correct answer is option B.
140. Bernoulli’s equation is not applicable, when the flow is
Irrotational
Incompressible
Viscous
All of the above
✅ The correct answer is option D.