Find factual mistakes in the sentences and correct them. 1. DC motors work very badly in hard systems as these need a large torque.
2. DC motors have long life expectancy.
3. DC motors require external mechanisms to start.
4. In AC motors the magnetic field is stationary while in DC motors it rotates.
5. AC motors have a permanent magnet in their construction.
6. In DC motors the magnetic field is induced.
7. AC motors are used in situations where it is necessary to control the speed from outside.
8. DC motors are most universal.
