Single Phase Motors
When a universal motor is operated on no load, its speed is limited by

Supply voltage frequency
Weight of the armature
Windage and friction
Armature reaction

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Single Phase Motors
If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then

motor will not come up to speed
current drawn by the motor will be excessively high
motor will not carry the load
electrolytic capacitor will, in all probability, suffer break down

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