E-PolyLearning

21. The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides 'x' & 'y' is given by
a. A
b. B
c. C
d. D
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Answer: (a).A

22. Various efficiencies of a centrifugal pump are related as (where, ηₘ = mechanical efficiency ηᵥ = volumetric efficiency. ηₘₐ = manometric efficiency ηₒ = overall efficiency)
a. ηₘₐ x ηₘ x ηᵥ = ηₒ
b. ηₘ = ηᵥ . ηₘₐ
c. ηₘₐ = ηₘ x ηᵥ
d. ηᵥ = ηₘ x ηₘₐ
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Answer: (b).ηₘ = ηᵥ . ηₘₐ

23. Fanning equation is given by below equation. It is applicable to __________ region flow.
a. transition
b. laminar
c. turbulent
d. both (b) and (c)
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Answer: (d).both (b) and (c)

24. The head loss due to sudden expansion is
a. A
b. B
c. C
d. D
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Answer: (b).B

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

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