What is the purpose of the devices labeled...

Question 1 / 205eccefa4bacbc34ba4d48469

Question 1 of 205eccefa4bacbc34ba4d48469

What is the purpose of the devices labeled "F SW" on the illustrated switchboard drawing? See illustration EL-0003.

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Question 1 of 20

5eccefa4bacbc34ba4d48469

What is the purpose of the devices labeled "F SW" on the illustrated switchboard drawing? See illustration EL-0003.

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🔍 Key Concepts

• Trace how the frequency meter (F) is wired to both generators on the EL-0003 diagram. • Remember that in a three‑phase alternator, all three legs have the same system frequency under normal operation. • Notice there is only one frequency meter but two generators — think about how the switch must function in that context.

💭 Think About

• Follow the wiring from each generator stator up toward Panel 2 and see where it passes through the devices marked F SW/FM Sel. Sw. before reaching the frequency meter. • Ask yourself: is the switch changing something about the three individual phase legs, or is it choosing which source is connected to the single meter? • Look at the other selector switches (for ammeter and voltmeter). Do they measure differences between phases, or do they simply select which generator or line is being monitored?

✅ Before You Answer

• Verify that there is only one frequency meter (F) on the entire board, but there are two generators feeding it. • Confirm whether any wiring from the F SW goes separately to each phase leg, or instead ties into a potential transformer or common point for each generator. • Before choosing, eliminate any options that require the switch to compare or average multiple phase frequencies, and focus on what a simple selector switch on a shipboard switchboard normally does.

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Question 1 of 20

What is the purpose of the devices labeled "F SW" on the illustrated switchboard drawing? See illustration EL-0003.

to determine the individual frequencies of each leg of a three phase alternator output to be displayed on the frequency meter by selective switching

to determine the difference between the individual frequencies of each leg of the three phase alternator output to be displayed on the frequency meter by selective switching

to select which alternator frequency is to be displayed on the frequency meter

to determine the average frequency of individual frequencies of each leg of a three phase alternator output to be displayed on the frequency meter

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Question 1 / 205eccefa4bacbc34ba4d48469

Question 1 of 205eccefa4bacbc34ba4d48469

What is the purpose of the devices labeled "F SW" on the illustrated switchboard drawing? See illustration EL-0003.

Back

Question 1 of 20

5eccefa4bacbc34ba4d48469

What is the purpose of the devices labeled "F SW" on the illustrated switchboard drawing? See illustration EL-0003.

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

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