Electrical
(Use breaker numbers as needed in your answer. Also refer to busses as listed on the diagram using both
switchboard and bus designation. Example: "Emergency swbd 120V bus" not just... '120 V bus')
1. Can one battery supply the 120 V DC bus? Yes/No Why?
2. From which bus does the midship load center SWBD receive its power from?
3. What bus normally supplies the 120 V DC bus?
4. The emergency diesel is normally off. What bus can supply the 450 V Emerg Swbd bus? (two
busses could...only one is used at time)
5. What is the voltage output of the Ships service generator?
6. Of breakers 8, 9 and 10, only one can be closed at any one time. Why might this be?
this?
7. If breaker 14 is opened, what bus and switchboard loses power?
8. If generators 3 and 4 are inoperable, in what way could power be supplied to the aft ship service
switchboard?
9. What breakers need to be closed if generators 3 and 4 were to supply the FWD ship service 120
V bus?

Answer :

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