Answer Posted / mazher

This situation is higly avoided because if anyone runs
engine on critical speed machine will start vibrating
hevily & it could creat great damage to engine.This
vibration is bacially due to Natural frequency & shaft
material frequency is matching & which creats high
vibration in machines. Nobody should operate machine in
this situation.In high speed machines like compressors &
turbines, We should pass the critical speeds as sharply as
we can to avoid the damage to machine.

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