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

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

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Single Phase Motors
Which of the following statements regarding hysteresis motor is in incorrect ?

It is extremely quiet in operation
It is extremely sensitive to fluctuations in supply voltage
It accelerates from rest to full-speed almost instantaneously
Its high starting torque is due to its high rotor hysteresis loss

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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 is not subject to any magnetic or mechanical vibrations
it revolves synchronously
it can be easily manufactured in extremely small sizes of up to 1 W output

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