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Question 1 of 2066636eed28f7522a1c51db3b

As shown in the illustration of a cycloconverter for an AC synchronous propulsion motor, what statement is true concerning the operating motor frequency? Illustration EL-0157

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Question 1 of 20

66636eed28f7522a1c51db3b

As shown in the illustration of a cycloconverter for an AC synchronous propulsion motor, what statement is true concerning the operating motor frequency? Illustration EL-0157

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🔍 Key Concepts

• Cycloconverter operation – it directly converts AC of one frequency to AC of another frequency without an intermediate DC link. • Look at the resultant synthesized waveform in the lower part of the illustration: how many line-frequency cycles are used to form one motor-voltage cycle? • The practical limits on output frequency for a cycloconverter feeding a large AC synchronous propulsion motor (commutation and waveform distortion considerations).

💭 Think About

• From the drawing, decide whether the green synthesized waveform is higher or lower in frequency than the original sinusoid it is built from. • Think about whether a cycloconverter more commonly serves as a step-down frequency changer (for slow-speed, high-torque drives) or as a step-up frequency changer. • Consider what happens to commutation and harmonic distortion if you try to make the motor frequency approach or exceed the mains frequency.

✅ Before You Answer

• Verify whether the synthesized output in the illustration contains multiple mains cycles inside a single output cycle, or the other way around. • Confirm that marine cycloconverter propulsion drives are typically used for low-speed, high-torque synchronous motors, not high-speed motors. • Check which options describe an output frequency that is lower than, equal to, or higher than the mains frequency, and eliminate those that conflict with the observed waveform.

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Question 1 of 2066636eed28f7522a1c51db3b

As shown in the illustration of a cycloconverter for an AC synchronous propulsion motor, what statement is true concerning the operating motor frequency? Illustration EL-0157

Back

Question 1 of 20

66636eed28f7522a1c51db3b

As shown in the illustration of a cycloconverter for an AC synchronous propulsion motor, what statement is true concerning the operating motor frequency? Illustration EL-0157

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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