As shown in the illustration, if the line...

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Question 1 of 2066636eed28f7522a1c51db5c

As shown in the illustration, if the line voltage is 450 VAC, what would be the applied voltage to the motor at the instant of startup and through the acceleration period? Illustration EL-0012

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Question 1 of 20

66636eed28f7522a1c51db5c

As shown in the illustration, if the line voltage is 450 VAC, what would be the applied voltage to the motor at the instant of startup and through the acceleration period? Illustration EL-0012

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🔍 Key Concepts

• This is a primary‑resistor reduced‑voltage starter; the resistors in series with each line reduce the motor’s line voltage during starting and acceleration. • At the instant of startup only one contactor is closed to feed the motor through the resistors; the main contactor that applies full line voltage is still open. • The labeled percentages (100%, 80%, 65%, 50%, 0%) on the resistor bank represent the percentage of full line voltage applied to the motor as different sections of resistance are shorted out.

💭 Think About

• From the schematic, which contactor is energizing the motor windings at the instant you press Start—1S or 2S? What path does current take from L1/L2/L3 to the motor? • Looking at that current path, which tap on the resistor bank is actually connected to the motor terminals during the initial starting period? What does the nearby percentage number mean physically? • Once you know the percentage of full line voltage applied at startup, how do you calculate the actual motor voltage if line voltage is 450 VAC?

✅ Before You Answer

• Be certain which contactor(s) are closed during starting only versus during normal running (check the mechanical interlock and timer contacts). • Confirm exactly which percentage tap is in use while the motor is accelerating and 1S is still open. • After identifying the correct percentage, multiply it by 450 VAC line voltage and round to the nearest value in the answer choices.

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Question 1 of 2066636eed28f7522a1c51db5c

As shown in the illustration, if the line voltage is 450 VAC, what would be the applied voltage to the motor at the instant of startup and through the acceleration period? Illustration EL-0012

Back

Question 1 of 20

66636eed28f7522a1c51db5c

As shown in the illustration, if the line voltage is 450 VAC, what would be the applied voltage to the motor at the instant of startup and through the acceleration period? Illustration EL-0012

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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