Question

What is the formula of the width of fan?

(a) width of fan = area of outlet opening * 2.88 * outside diameter */ coefficient of utilization

(b) width of fan = 1/ area of outlet opening * 2.88 * outside diameter * coefficient of utilization

(c) width of fan = area of outlet opening * 2.88 * outside diameter * coefficient of utilization

(d) width of fan = area of outlet opening / 2.88 * outside diameter * coefficient of utilization

I got this question in unit test.

Question is taken from Design of Fan topic in chapter Aspects of Design of Mechanical Parts of Design of Electrical Machines

Answer 1

The correct answer is (d) width of fan = area of outlet opening / 2.88 * outside diameter * coefficient of utilization

To elaborate: The area of outlet opening and the outside diameter is calculated. After fixing the coefficient of utilization and on substituting the width of fan is obtained.