Engine : Electricity - 1229/1386
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| How is the speed of the propeller shaft directly coupled to an AC synchronous propulsion motor changed when powered by a variable frequency alternator in an AC turboelectric drive system? |
| A) varying the field strength of the motor |
| B) varying the field strength of the generator |
| C) varying the number of motor poles |
| D) varying the turbine speed |
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