Electrical ESWS Questions PDF

ELECTRICAL ESWS QUESTIONS 1) Describe the location of all switchboards, 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 2) At what point will load shed occur automa...

ELECTRICAL ESWS QUESTIONS 1) Describe the location of all switchboards, 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 2) At what point will load shed occur automatically and why do we want it to occur? 100% Rated load for 100ms, keeps generator within normal parameters by shedding non vital loads to ensure continued power supplied to vital loads 3) How many load centers do we have? Describe their numbering convention? 23, First number describes the electrical zone, Second number refers to port or starboard. EX LC 12 is in Zone 1 and on the Port side 4) What are the ratings of the APD and what is its purpose? +/-5% Voltage, +/-0.2HZ, +/-15 degree phase angle, prevents paralleling generators out of phase 5) Why do we need 400HZ converters? Where are they? Combat systems require 400 HZ but our generators run at 60 HZ. Converters allow us to change the frequency, located in FWD and AFT power conversion rooms. 6) How many shore power terminals do we have? How many do we use? Where are they located and where do they feed to? 12 terminals but we use 10, located at midships topside and feed 2SP switchboard in MER2 7) What are the generator ratings? 4800 Amps, 3000 KW, 450 Volt, 60 HZ 8) What degaussing coils do we have? What do they do? A – Athwartships coil, M – Main coil, FP QP – Focsle Quarterdeck Permanent and FI QI – Focsle Quarterdeck Induced They allow us to hide the ships magnetic signature by inducing currents in coils around the ship creating a field we can control thus enabling us to hide from magnetic mines 9) What are the major components of degaussing other than the coils? Where are they located? Power supply units – Power supply room next to the refer decks, remote control panel on the bridge and the degaussing switchboard in CCS 10) What is an ABT and an MBT? How are the two different? They both provide normal and alternate sources of power to equipment. An ABT is used for Vital loads and will automatically shift from one to the other when a power source is lost. An MBT is not used on vital loads and will need to be manually shifted from one source to the other.