Single Phase Motors
In repulsion motor, maximum torque is developed when

None of these
brush axis is at 90° electrical to the field axis
brush axis coincides with the field axis
brush axis is at 45° electrical to the field axis

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

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

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