E-PolyLearning

31. The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is
a. A
b. B
c. C
d. D
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Answer: (b).B

32. A pipe has a porous section of length L as shown in the figure. Velocity at the start of this section of V₀. If fluid leaks into the pipe through the porous section at a volumetric rate per unit area q(x/L)², what will be axial velocity in the pipe at any x ? Assume incompressible one dimensional flow i.e., no gradients in the radial direction.
a. A
b. B
c. C
d. D
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Answer: (d).D

33. A free jet of water of cross-sectional area 0.01 m² and a velocity of 20 m/s strikes a plate and then flows in a plane parallel to the plate as shown in the figure below. The horizontal component of the force on the support is
a. 200 N
b. 400 N
c. 2000 N
d. 4000 N
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Answer: (d).4000 N

34. Pressure drop for laminar fluid flow through a circular pipe is given by
a. A
b. B
c. C
d. D
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Answer: (b).B

35. Drag co-efficient for motion of spherical particles in a stationary fluid in the stoke's law range is
a. A
b. B
c. C
d. D
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Answer: (a).A