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What is the range of the coefficients of hydrodynamic resistances for the rectangular edges at inlet?

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What is the range of the coefficients of hydrodynamic resistances for the rectangular edges at inlet?

(a) 10-20 * 10^-3

(b) 30 * 10^-3

(c) 20-30 * 10^-3

(d) 20-25 * 10^-3

I had been asked this question in a national level competition.

Query is from Design of Fan in portion Aspects of Design of Mechanical Parts of Design of Electrical Machines

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Correct choice is (b) 30 * 10^-3

Explanation: The coefficients of hydrodynamic resistances are used in the calculation of the total head. For rectangular edges the range is about 30 * 10^-3.

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