E-PolyLearning

36. Hydraulic mean radius for flow through packed bed of spherical particle of size, 'Dₚ', with porosity 'ε' is
a. A
b. B
c. C
d. D
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Answer: (a).A

37. A conical tank with a bottom opening of cross-sectional area A is filled with water and is mounted on supports as shown in the figure. What is the force F with which plate X must be pushed up to prevent water from leaking ? Assume that the density of air is negligible as compared to the density of water ρL.
a. ρL . Vg
b. ρL . A.Hg
c. ρL . Vg/2
d. ρL .Vg/3
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Answer: (b).ρL . A.Hg

38. The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by(where, x = each side of the square duct)
a. A
b. B
c. C
d. D
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Answer: (a).A

39. Each term of the Bernoulli's equation written in the following form, represents the total energy per unit
a. mass
b. volume
c. specific weight
d. none of these
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Answer: (a).mass

40. For one dimensional flow of an incompressible fluid in unsteady state in x-direction, the continuity equation is given by
a. A
b. B
c. C
d. D
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Answer: (a).A