6. For centrifugal pump impeller, the maximum value of the vane exit angle is
A. 20? to 25?
B. 25? to 30?
C. 15? to 20?
D. 10? to 15?
6. For centrifugal pump impeller, the maximum value of the vane exit angle is
A. 20? to 25?
B. 25? to 30?
C. 15? to 20?
D. 10? to 15?