With what device is the RPM of an AC...

Question 1 / 270705eccefa4bacbc34ba4d4846e

Question 1 of 270705eccefa4bacbc34ba4d4846e

With what device is the RPM of an AC generator indirectly measured on a switchboard when operating singly (no other generator connected to the bus)?

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Question 1 of 27070

With what device is the RPM of an AC generator indirectly measured on a switchboard when operating singly (no other generator connected to the bus)?

🔍 Key Concepts

• Relationship between generator speed (RPM) and AC frequency (Hz) • What each device actually measures on a switchboard: voltage, frequency, or phase/synchronism • How frequency changes when the prime mover speeds up or slows down

💭 Think About

• Ask yourself: Which instrument will change reading immediately if the generator’s speed changes while operating alone? • Which devices are mainly used only when paralleling generators, and which are useful with a single generator? • If engine RPM increases slightly, what electrical parameter on the bus changes in step with that RPM change?

✅ Before You Answer

• Identify which instrument is specifically designed to indicate system frequency (Hz). • Separate the tools used for checking phase and synchronism (for paralleling) from those used in single-generator operation. • Confirm that voltage can vary independently of RPM (via excitation), while frequency is directly tied to RPM for a given number of poles.

Question 1 of 27070

With what device is the RPM of an AC generator indirectly measured on a switchboard when operating singly (no other generator connected to the bus)?

voltmeter

synchronizing lamps

frequency meter

synchroscope