Roots blower
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In the wastewater treatment system, the Roots blower used for aeration originally had a motor with a capacity of 11 million; it has now been replaced with one having a capacity of 5.5 million, and the diameter of the blower’s pulley has also been increased. By how much will the air volume and air pressure decrease? Is the motor current overloaded?
Look at the curve and you’ll understand.
Bingo, second floor is correct!