In comparison to a main switchboard for a DC...

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Question 1 of 205eccefa4bacbc34ba4d48472

In comparison to a main switchboard for a DC electrical distribution system, a main switchboard for an AC electrical distribution system requires the use of which of the following devices, whereas a DC main switchboard does not?

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🔍 Key Concepts

• Differences between AC (alternating current) and DC (direct current) systems • What measurements are unique to AC systems, such as frequency, power factor, and reactive power (kVAR) • Which control and protection devices are needed for both AC and DC generators vs. which are AC‑only

💭 Think About

• Look at each choice and ask: is this something that would also be needed, or at least useful, on a DC system, or is it meaningful only when voltage and current are alternating and have a phase angle? • Think about what you must do before connecting an AC generator in parallel with an AC bus. Which instruments help you match conditions? Would those same instruments make sense on a DC system? • Separate controls/protection (like breakers, relays, regulators) from measurement and synchronizing devices. Which of these would a DC switchboard already have?

✅ Before You Answer

• For each option, decide: does this device depend on frequency or phase angle to have meaning? • Ask whether synchronizing is done the same way for DC as for AC; what extra indications do you need for AC paralleling? • Verify which items (like circuit breakers, voltage regulators, and governors) are common equipment for both AC and DC generator switchboards.

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