Podcast
Questions and Answers
Which of the following load centers is located in Zone 1 on the starboard side?
Which of the following load centers is located in Zone 1 on the starboard side?
- LC 21
- LC 22
- LC 11 (correct)
- LC 12
If the main power supply is lost in an ABT, what happens?
If the main power supply is lost in an ABT, what happens?
- The ship's power grid will collapse.
- The associated equipment will be powered by the MBT.
- The system automatically switches to an alternate power source. (correct)
- An alarm will sound and the crew must manually switch to an alternate power source.
What is the purpose of the Automatic Paralleling Device (APD)?
What is the purpose of the Automatic Paralleling Device (APD)?
- To convert 60HZ AC power to 400HZ AC power.
- To prevent paralleling generators out of phase and maintain stable power supply. (correct)
- To isolate electrical zones in case of a fault.
- To control the degaussing coils.
Where are 400HZ converters located and what is their function?
Where are 400HZ converters located and what is their function?
Which of the following is NOT a type of degaussing coil?
Which of the following is NOT a type of degaussing coil?
What is the primary function of the degaussing system?
What is the primary function of the degaussing system?
What is the purpose of the degaussing switchboard?
What is the purpose of the degaussing switchboard?
What is the relationship between the degaussing coils and the magnetic field?
What is the relationship between the degaussing coils and the magnetic field?
Flashcards
Switchboard Locations
Switchboard Locations
1SB: Forward of CPO mess, 2SB: By post office, etc.
Load Shed Occurrence
Load Shed Occurrence
Automatic load shedding occurs at 100% rated load for 100ms to protect generators.
Number of Load Centers
Number of Load Centers
There are 23 load centers, with the first digit indicating the zone and the second indicating side (port/starboard).
APD Ratings
APD Ratings
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Purpose of 400HZ Converters
Purpose of 400HZ Converters
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Shore Power Terminals
Shore Power Terminals
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Generator Ratings
Generator Ratings
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Degaussing Components
Degaussing Components
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Study Notes
Electrical ESWS Questions
- Switchboard Locations: 1SB (forward of CPO mess), 2SB (by post office), 3SB (by ship's classroom), 1SA & 1SG AUX 1, 2SA & 2SP & 2SG MER2, 3SA & 3SG 3GEN
Load Shed
- Automatic Load Shed Point: Occurs automatically when generator output reaches 100% rated load for 100ms. This avoids overloading the generator.
- Purpose of Load Shed: To maintain generator within normal parameters. This ensures continued power supply to vital loads.
Load Centers
- Number of Load Centers: 23
- Numbering Convention: First number represents the electrical zone (e.g., Zone 1). Second number indicates port or starboard (e.g., LC 12 is in Zone 1 on the port side).
APD Ratings
- APD Ratings: +/-5% voltage, +/-0.2Hz, +/-15 degrees phase angle.
- Purpose: Prevents generator paralleling when not in phase.
400 Hz Converters
- Purpose: Combat systems require 400 Hz but generators run at 60 Hz, converters change the frequency.
- Location: Forward and Aft power conversion rooms.
Shore Power Terminals
- Number of Terminals: 12
- Number Used: 10
- Feed Location: Midships topside, feeding 2SP switchboard (in MER2).
Generator Ratings
- Ratings: 4800 Amps, 3000 kW, 450 Volt, 60 Hz
Degaussing Coils
- Types: Athwartships coil, Main coil, FP QP - Focsle Quarterdeck Permanent and FI QI - Focsle Quarterdeck Induced
- Purpose: Hide ship's magnetic signature by inducing currents to create a controllable field, helping avoid detection by magnetic mines.
Degaussing Components (besides coils)
- Components: Power supply units
- Location: Power supply room (next to the refer decks), remote control panel on the bridge, and degaussing switchboard in CCS
ABT and MBT
- ABT: Alternate source for vital loads; automatically shifts to another power source if one fails.
- MBT: Alternate source; not automatically used on vital loads; requires manual shifting from one source to the other.
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