If the excitation of an alternator operating...

Question 1 / 205eccefa4bacbc34ba4d481a8

Question 1 of 205eccefa4bacbc34ba4d481a8

If the excitation of an alternator operating in parallel is decreased below normal and the other above normal, what will be the result on the alternator with the excitation decreased below normal?

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Question 1 of 20

5eccefa4bacbc34ba4d481a8

If the excitation of an alternator operating in parallel is decreased below normal and the other above normal, what will be the result on the alternator with the excitation decreased below normal?

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🔍 Key Concepts

• Synchronous alternators in parallel – how reactive power (VARs) is shared vs. real power (kW) • Field excitation / field current – how increasing or decreasing excitation affects armature current phase angle and power factor • Difference between kW load sharing (governor/speed control) and power factor / reactive load sharing (excitation control)

💭 Think About

• When two alternators are in parallel at the same kW load, what mainly changes if you alter only the excitation of one machine? Think: real power or reactive power? • If an alternator’s field excitation is reduced while terminal voltage and kW remain about the same, does its current tend to lead or lag the bus voltage? • Which quantity is primarily controlled by the engine governor (prime mover) and which is primarily controlled by the exciter? Match those to the answer choices.

✅ Before You Answer

• Be clear on which answer options refer to power factor (leading vs. lagging) and which refer to current (ampere load) or real power (kW load). • Verify in your notes: decreasing excitation on a synchronous alternator, at constant kW, causes the machine’s power factor to move in which direction relative to the bus voltage? • Confirm for yourself that changing excitation alone does not directly change the alternator’s kW sharing; that’s mainly controlled by governor speed setting.

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Question 1 of 20

If the excitation of an alternator operating in parallel is decreased below normal and the other above normal, what will be the result on the alternator with the excitation decreased below normal?

power factor will change in the lagging direction

power factor will change in the leading direction

ampere load will be greatly increased

kilowatt load will be greatly decreased

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Question 1 / 205eccefa4bacbc34ba4d481a8

Question 1 of 205eccefa4bacbc34ba4d481a8

If the excitation of an alternator operating in parallel is decreased below normal and the other above normal, what will be the result on the alternator with the excitation decreased below normal?

Back

Question 1 of 20

5eccefa4bacbc34ba4d481a8

If the excitation of an alternator operating in parallel is decreased below normal and the other above normal, what will be the result on the alternator with the excitation decreased below normal?

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