Question 1 of 20
Q
Besides voltage and frequency, what other factor must be the same when alternators are operating in parallel?
A
kilowatt load division
B
amperage load division
C
reactive load division
D
phases in synchronism
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Question 1 / 205eccefa4bacbc34ba4d481c0
Question 1 of 205eccefa4bacbc34ba4d481c0

Besides voltage and frequency, what other factor must be the same when alternators are operating in parallel?

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Question 1 of 20
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Besides voltage and frequency, what other factor must be the same when alternators are operating in parallel?

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🔍 Key Concepts

• Parallel operation of alternators – what conditions must match before closing the breaker? • Difference between real power (kW), current (amps), reactive power (kVAR), and number/relationship of phases. • Meaning of synchronism in three‑phase AC systems.

💭 Think About

• When two alternators run together, which condition—if it is NOT matched—would cause very large circulating currents the instant you connect them? • Think about what the synchroscope and phase‑sequence indicator actually check before you parallel an alternator. • Which of the choices is a system condition that must be correct before paralleling, rather than something you adjust or share after they are already paralleled?

✅ Before You Answer

• Identify which option describes a fixed electrical relationship rather than a load‑sharing outcome. • Ask: which of these is normally checked with synchronizing lamps or a synchroscope, not with ammeters or kilowatt meters? • Eliminate any options that mainly relate to how load is divided after the machines are already safely in parallel.

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