21. Light duty cranes are used in which of the following?
22. The diameter of the rotor shaft for an electric motor depends on which of the following?
23. In case of __________ speed control by injecting e.m.f. in the rotor circuit is possible,
24. Which of the following motors is preferred when smooth and precise speed control over a wide range is desired?
25. The selection of an electric motor for any application depends on which of the following factors?
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