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What factor/factors are required to evaluate the hydrodynamic resistance?

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in Design of Electrical Machines by (687k points)
What factor/factors are required to evaluate the hydrodynamic resistance?

(a) area of cross section

(b) hydrodynamic coefficients

(c) area of cross section or hydrodynamic coefficients

(d) area of cross section and hydrodynamic coefficients

I have been asked this question during an internship interview.

The question is from Design of Fan topic in portion Aspects of Design of Mechanical Parts of Design of Electrical Machines

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The correct option is (d) area of cross section and hydrodynamic coefficients

Easy explanation: The hydrodynamic resistance is calculated from the hydrodynamic coefficients. It is also calculated from the area of cross section.

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