Which of the listed motors will operate at...

Question 1 / 205eccefa4bacbc34ba4d48268

Question 1 of 205eccefa4bacbc34ba4d48268

Which of the listed motors will operate at the highest RPM, assuming that each operates at the same frequency?

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Question 1 of 20

5eccefa4bacbc34ba4d48268

Which of the listed motors will operate at the highest RPM, assuming that each operates at the same frequency?

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🔍 Key Concepts

• Synchronous speed formula for AC motors: how speed depends on frequency and number of poles • Difference between synchronous motors and induction motors in terms of running speed and slip • Effect of number of poles (4-pole vs 6-pole) on motor RPM at the same frequency

💭 Think About

• First, decide which has the higher theoretical synchronous speed: a 4-pole motor or a 6-pole motor at the same frequency. Why? • Next, think about the difference between synchronous and induction motors: which one actually runs exactly at synchronous speed, and which one runs slightly below it? • How does load (no load vs normal load vs full load) affect the slip of an induction motor, and therefore its actual RPM compared to synchronous speed?

✅ Before You Answer

• Write down and compare the synchronous speeds for 4-pole and 6-pole motors at the same frequency before looking at the options. • Recall that a synchronous motor has essentially zero slip in normal operation, while an induction motor must have some slip to produce torque. • Check which option combines the fewest poles and least effect of slip to give the highest actual RPM.

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Question 1 of 20

Which of the listed motors will operate at the highest RPM, assuming that each operates at the same frequency?

A four-pole synchronous motor under normal load.

A four-pole induction motor under no load.

A six-pole synchronous motor under normal load.

A six-pole induction motor under full load.

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Question 1 / 205eccefa4bacbc34ba4d48268

Question 1 of 205eccefa4bacbc34ba4d48268

Which of the listed motors will operate at the highest RPM, assuming that each operates at the same frequency?

Back

Question 1 of 20

5eccefa4bacbc34ba4d48268

Which of the listed motors will operate at the highest RPM, assuming that each operates at the same frequency?

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