Single Phase Motors
Most of the fractional horsepower motors have either

ball or roller bearings
plain or sleeve bearings
soft and porous bearings
hard and annealed bearings

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

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

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