Question

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

(a) 40-50 * 10^-3

(b) 40-60 * 10^-3

(c) 30-50 * 10^-3

(d) 30-40 * 10^-3

This question was posed to me by my college professor while I was bunking the class.

This interesting question is from Design of Fan topic in chapter Aspects of Design of Mechanical Parts of Design of Electrical Machines

Answer 1

Correct answer is (b) 40-60 * 10^-3

The best I can explain: The coefficients of hydrodynamic resistances are used in the calculation of the total head. For protruding edges the range is about 40-60 * 10^-3.