Question: An axial flow fan balanced at one speed often exhibits substantial vibrational effects when operated at other speeds, mainly due to (a) primary critical speed

An axial flow fan balanced at one speed often exhibits substantial vibrational effects when operated at other speeds, mainly due to

(a) primary critical speed effect

(b) secondary critical speed effect

(c) unbalanced parts of the fan

(d) aerodynamic unbalance.

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