When rolling over a DC main propulsion motor...

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Question 1 of 205eccefa4bacbc34ba4d485c4

When rolling over a DC main propulsion motor in local emergency mode or throttle bypass mode, what must be done with the variable rheostat in terms of turning the handle?

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5eccefa4bacbc34ba4d485c4

When rolling over a DC main propulsion motor in local emergency mode or throttle bypass mode, what must be done with the variable rheostat in terms of turning the handle?

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🔍 Key Concepts

• DC propulsion motor starting characteristics – high inrush current and the need to limit it • Function of a starting/acceleration rheostat in controlling current and voltage to the armature • Consequences of moving the rheostat handle too fast vs. too slow when the motor is just starting to turn

💭 Think About

• Think about what happens to armature current when a DC motor is not yet turning and you suddenly reduce resistance with the rheostat. • Which rheostat‑handle action both protects the motor from excessive current and still ensures the armature actually starts to rotate? • In an emergency local or bypass mode, is your first priority to reach full speed quickly, or to bring the motor on line safely and under control?

✅ Before You Answer

• Verify how the starting rheostat is normally operated: is it moved smoothly and just enough to get rotation, or snapped to a high‑speed position? • Consider the risk of excessive armature current if resistance is removed too rapidly before the motor is turning. • Check which choice emphasizes controlled, sufficient movement of the handle rather than a sudden large change in resistance.

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Question 1 of 205eccefa4bacbc34ba4d485c4

When rolling over a DC main propulsion motor in local emergency mode or throttle bypass mode, what must be done with the variable rheostat in terms of turning the handle?

Back

Question 1 of 20

5eccefa4bacbc34ba4d485c4

When rolling over a DC main propulsion motor in local emergency mode or throttle bypass mode, what must be done with the variable rheostat in terms of turning the handle?

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?

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