Which of the following statements is true...

Question 1 / 205eccefa4bacbc34ba4d4823b

Question 1 of 205eccefa4bacbc34ba4d4823b

Which of the following statements is true concerning a large polyphase synchronous main propulsion motor as used in an electric propulsion drive system?

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Question 1 of 20

5eccefa4bacbc34ba4d4823b

Which of the following statements is true concerning a large polyphase synchronous main propulsion motor as used in an electric propulsion drive system?

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🔍 Key Concepts

• Synchronous motor starting methods in large ship propulsion systems • Difference between induction motors vs synchronous motors (especially what happens at start vs at synchronous speed) • Behavior of starting current in large AC motors

💭 Think About

• Think about how a synchronous motor develops torque when it is at standstill. Does the field winding alone produce starting torque, or is another principle used? • Which type of motor can produce starting torque from slip between rotor speed and stator rotating field? How might a synchronous motor use this property? • For large AC motors, is starting current usually higher or lower than the rated running current if no special starting equipment is used?

✅ Before You Answer

• Verify what is done with the field winding during start on a large synchronous propulsion motor (is it energized, de-energized, or handled differently?). • Confirm whether a rotor resistance changing during start is a feature of wound-rotor induction motors, synchronous motors, or something else. • Check typical starting current characteristics of large synchronous and induction motors: does starting current normally exceed or stay below full-load current?

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Question 1 of 20

Which of the following statements is true concerning a large polyphase synchronous main propulsion motor as used in an electric propulsion drive system?

The field winding is energized for starting purposes only.

The motor is started as an induction motor.

Resistance is gradually added to the rotor circuit.

The starting current is held below the rated current.

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Question 1 / 205eccefa4bacbc34ba4d4823b

Question 1 of 205eccefa4bacbc34ba4d4823b

Which of the following statements is true concerning a large polyphase synchronous main propulsion motor as used in an electric propulsion drive system?

Back

Question 1 of 20

5eccefa4bacbc34ba4d4823b

Which of the following statements is true concerning a large polyphase synchronous main propulsion motor as used in an electric propulsion drive system?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed