it revolves synchronously
it is not subject to any magnetic or mechanical vibrations
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
Answer is Right!
Answer is Wrong!
The correct answer is D. Hysteresis motors develop hysteresis torque which is extremely steady both in amplitude and phase.
Hysteresis motors are particularly useful for high-quality record players and tape-recorders because they are able to produce a very smooth and consistent rotation. This is due to the fact that the hysteresis torque is not affected by changes in the load or the speed of the motor. As a result, hysteresis motors are ideal for applications where a high degree of accuracy is required, such as in the playback of audio recordings.
The other options are not correct because:
- Option A is incorrect because hysteresis motors do not revolve synchronously. They revolve at a speed that is determined by the load on the motor.
- Option B is incorrect because hysteresis motors are subject to magnetic and mechanical vibrations. However, these vibrations are typically very small and do not affect the performance of the motor.
- Option C is incorrect because hysteresis motors are not easily manufactured in extremely small sizes. They are typically manufactured in sizes that are larger than 1 W output.