As shown in the illustrated switchboard,...

Question 1 / 2707066636eed28f7522a1c51db29

Question 1 of 2707066636eed28f7522a1c51db29

As shown in the illustrated switchboard, what is the function of the switch labeled "PFM Sel. Sw."? Illustration EL-0003

Back

Question 1 of 27070

As shown in the illustrated switchboard, what is the function of the switch labeled "PFM Sel. Sw."? Illustration EL-0003

If the question has a related picture, it will appear here.

🔍 Key Concepts

• Trace what the PFM Sel. Sw. (power factor meter selector switch) is connected to on the one‑line diagram. • Compare how the FM Sel. Sw. (frequency meter selector switch) and AM Sel. Sw. (ammeter selector switch) are used on the same drawing. • Think about the difference between measuring a value on a single generator versus measuring a value on the bus.

💭 Think About

• Follow the wiring from the PFM Sel. Sw. upward and downward: does it lead to an individual generator, the bus, or both? • How do selector switches typically work on a ship’s switchboard when the same meter can be used for more than one generator? • Which quantity does a power factor meter actually measure – is it related to frequency, voltage, or the relationship between real and reactive power?

✅ Before You Answer

• Verify which instrument at the top of Panel 2 is directly associated with the PFM Sel. Sw. • Confirm whether any connection from the PFM Sel. Sw. goes to the main distribution bus or only to the individual generator circuits. • Be sure you are clear on what power factor represents (ratio of real power kW to apparent power kVA), and how that differs from frequency and reactive volt‑amperes.

Question 1 of 27070

As shown in the illustrated switchboard, what is the function of the switch labeled "PFM Sel. Sw."? Illustration EL-0003

to determine frequency of either generator

to determine bus frequency

to determine reactive volt amperes of the bus

to determine power factor of either generator

Question 1 / 2707066636eed28f7522a1c51db29

Question 1 of 2707066636eed28f7522a1c51db29

As shown in the illustrated switchboard, what is the function of the switch labeled "PFM Sel. Sw."? Illustration EL-0003

Back

Question 1 of 27070

As shown in the illustrated switchboard, what is the function of the switch labeled "PFM Sel. Sw."? Illustration EL-0003

If the question has a related picture, it will appear here.