Single Phase Motors
If a DC series motor is operated on AC supply, it will

Have poor efficiency
Have poor power factor
All of the listed here
Spark excessively

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

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

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Single Phase Motors
Hysteresis motor is particularly useful for high-quality record players and tape-recorders because

it develops hysteresis torque which is extremely steady both in amplitude and phase
it can be easily manufactured in extremely small sizes of up to 1 W output
it is not subject to any magnetic or mechanical vibrations
it revolves synchronously

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