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

Secondary critical speed effect

An axial flow fan balanced at one speed often exhibits substantial vib

1.	An axial flow fan balanced at one speed often exhibits substantial vibrational effect 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
Answer» C. Unbalanced parts of the fan

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

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