16. Which of the following methods is used to start a synchronous motor ?
17. Which of the following resistances can be measured by conducting insulation resistance test on a synchronous motor ?
18. Which of the following losses is not dissipated by the stator core surface in a synchronous motor ?
19. The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of
20. A synchronous motor working at leading power factor can be used as
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