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A 4-bladed fan is intended to run at 900 rpm. Indicate the frequencies which may be of interest for condition monitoring purposes, giving reasons for

A 4-bladed fan is intended to run at 900 rpm.

Indicate the frequencies which may be of interest for condition monitoring purposes, giving reasons for you answers.

Suggest a suitable sampling frequency for the condition monitoring system in order to produce an FFT spectrum, giving reasons for your answer.

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