Discussion
The best suited motor to drive 3/4 H.P. air compressor would be _______ motor.
Answer: A
The best suited motor is the capacitor-start motor.
A compressor must start against pressure, so it needs a high starting torque. A capacitor-start induction motor, with a capacitor in its starting winding giving nearly 90° between the winding currents, develops a starting torque of three to four times full-load torque and runs at a nearly constant speed, which suits compressors, pumps and refrigerators in the fractional to one horsepower range.
Resistance split-phase motors have only moderate starting torque, shaded-pole motors very low starting torque, and single-phase series motors run at a speed that varies widely with load.
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