Question:-
For attaining a non-overloading characteristic in centrifugal pumps
Option (A)
Backward bent vanes are preferred over forward bent vanes
Option (B)
Forward bent vanes are preferred over backward bent vanes
Option(C)
Forward bent vanes are preferred over vanes radial at outlet
Option(D)
Vanes radial at outlet are preferred over backward vanes.
Correct Option:
(A)
Question Solution:

As shown in figure, in forward curved vanes head increases with the discharge. Hence with forward curves vanes (Æ> 90°) power input rises sharply, with the discharge whereas in backward vanes (Æ < 90°), the power input decreases steadily with the increases in discharge
question-answer-faq-3035