Q.

In case of a Medium runner, tan (α1) CANNOT be given by (α1 = Guide vane angle at inlet)?

A. vf1 / vw1
B. vr1 / vw1
C. vr1 / u1
D. vw1 / u1
Answer» D. vw1 / u1
Explanation: in medium runner, vf1 = vr1 & vw1 = u1. vw1 and u1 are along the same direction, hence that cannot be written as tan (α1).
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