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actually, the power factor means how much energy you get from what you entered, so that's what it's very important and vital at least economically.
for the noise you ask about: always remember that any change in any machine would bring up unstable condition, I mean in loading or unloading the machine passes through unstable moment so the machine trying to step out of this it will used more (or less) effort to come back to be stable once again.
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