If an unloaded DC compound motor's shunt...

Question 1 / 205eccefa3bacbc34ba4d48056

Question 1 of 205eccefa3bacbc34ba4d48056

If an unloaded DC compound motor's shunt field were weakened by excessive rheostat resistance or by an open circuit, how would the motor respond?

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Question 1 of 20

5eccefa3bacbc34ba4d48056

If an unloaded DC compound motor's shunt field were weakened by excessive rheostat resistance or by an open circuit, how would the motor respond?

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🔍 Key Concepts

• DC compound motor behavior when shunt field flux is reduced • Relationship between flux, speed, and counter-electromotive force (CEMF) in DC motors • Effect of an open shunt field circuit on motor speed and safety

💭 Think About

• Think about how motor speed must change to keep the balance between applied voltage, armature current, and CEMF when the field flux gets weaker. • Consider what happens to the torque and current draw if the motor tries to maintain load with a much weaker magnetic field. • Ask yourself which response of the motor would be the most dangerous and why protection devices are used on DC motors.

✅ Before You Answer

• Verify whether reducing field flux tends to make a DC motor speed up or slow down. • Check what happens to CEMF when speed changes and how that affects armature current. • Consider whether an open shunt field is a condition that can cause rapid overspeed, requiring emergency protection.

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Question 1 of 20

If an unloaded DC compound motor's shunt field were weakened by excessive rheostat resistance or by an open circuit, how would the motor respond?

continue to run at base speed

stop because of low flux

slow down and overheat

overspeed due to reduced CEMF

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Question 1 / 205eccefa3bacbc34ba4d48056

Question 1 of 205eccefa3bacbc34ba4d48056

If an unloaded DC compound motor's shunt field were weakened by excessive rheostat resistance or by an open circuit, how would the motor respond?

Back

Question 1 of 20

5eccefa3bacbc34ba4d48056

If an unloaded DC compound motor's shunt field were weakened by excessive rheostat resistance or by an open circuit, how would the motor respond?

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