book for engineers electricity

7/25/2019 book for engineers electricity

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! #" &%$ %Rated voltage or voltages

Rated full-load amps for each voltage level

Frequency

Phase

Rated full-load speed

Insulation class and rated ambient temperature

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answer1-For squirrel cage motor

-by using a stator winding which can be connected for a different no of poles$-by varying the frequency$

2-For wound rotor:-by cascade connection of two or more motors$

-by inserting voltage in the rotor circuit$-by inserting resistance in the rotor circuit

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book for engineers electricity

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