What statement is TRUE concerning the speed...

Question 1 / 270705eccefa4bacbc34ba4d4823c

Question 1 of 270705eccefa4bacbc34ba4d4823c

What statement is TRUE concerning the speed of a synchronous AC propulsion motor?

Question 1 of 27070

What statement is TRUE concerning the speed of a synchronous AC propulsion motor?

🔍 Key Concepts

• Synchronous AC motor speed equation and what "synchronous" means • Which part of the motor (stator vs rotor) is supplied with AC power in a typical synchronous propulsion motor • Relationship between supply frequency, number of poles, and synchronous speed

💭 Think About

• Ask yourself: In a synchronous AC motor, which windings are actually connected to the ship’s AC power bus – the stator or the rotor? • Think about the formula for synchronous speed in revolutions per minute (RPM). How does changing frequency in that formula affect speed? • Consider whether the rotor frequency is normally the controlled variable in shipboard AC propulsion, or if it follows what happens in the stator field.

✅ Before You Answer

• Identify which winding (stator or rotor) sets up the rotating magnetic field whose speed the rotor locks onto. • Recall that for a synchronous machine, the rotor speed is tied to the synchronous speed of the stator field, not slipping like an induction motor. • Check whether the relationship between frequency and speed in the synchronous speed formula is direct (both go up together) or inverse (one goes up while the other goes down).

Question 1 of 27070

What statement is TRUE concerning the speed of a synchronous AC propulsion motor?

The speed is directly proportional to the frequency applied to its stator windings.

The speed is directly proportional to the frequency applied to its rotor windings

The speed is inversely proportional to the frequency applied to its stator windings.

The speed is inversely proportional to the frequency applied to its rotor windings.

Question 1 / 270705eccefa4bacbc34ba4d4823c

Question 1 of 270705eccefa4bacbc34ba4d4823c

What statement is TRUE concerning the speed of a synchronous AC propulsion motor?

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Question 1 of 27070

What statement is TRUE concerning the speed of a synchronous AC propulsion motor?