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An electronic variable-speed- controlled fan operates at 1200 RPM.   How much is its acoustical power (in...

An electronic variable-speed- controlled fan operates at 1200 RPM.   How much is its acoustical power (in decibel) reduced if

The fan speed is reduced by 20%. (5 points)

The fan speed is reduced by 50% (5 points)

Engineering   Mechanical-Engineering   
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