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23 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What does the term "fuse current rating" mean |
Maximum current a fuse can operate at |
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What is the function of the fuse in an electrical circuit? |
To protect the circuit from a surge of current |
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What is the purpose of silica sand in the fuse body |
Absobs the vapor when fuse blows to prevent ionisation |
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How can we insure discrimination is maintained |
Replace any blown fuse with a fuse of the same rating |
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What are the advantages of a circuit breaker over fuses |
They can be reset |
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What is the disadvantage of a circuit breaker over a fuse |
Is when the circuit breaker is tagged out for maintenance purposes the circuir breaker is open but still in circuit |
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What is the primary purpose of an rcd |
To prevent harm to personel from a electeic shock |
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What is the current diffrence between active and neutral during operation called? |
Residual current |
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What is the purpose of the ballast in the circuit? |
It limmits current flowing through electrodes, and provides a surge of high voltage wich causes arc to cross tube creating light |
Referring to fluorescent lights |
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What is the purpose of the capacitors in fluorescent lights |
Prevents emi and helps starter make a clean break when opining the filament. Also helps with power factor |
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Purpose of insulation testing |
.Test for any shorts Measurement of resistane must be over 1M♤ |
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Name the different protection devices for power distribution. |
•an under voltage trip •an istantaneous short circuit trip •a time delayed shorr circuit trip |
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Specs of the generator |
440v 60hz 650kw 1040A |
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Name shore supply criteria |
Voltage must not excede 450v frequency must be 60hz • ships structure must be bonded to dock side or jetty • phase rotation is to be checked • connections are not live |
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Shore supply conection boxes |
440v 60hz 1200A each plug 400A |
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Name precautions before isolation testing. |
Ensure there is no power Ensure there is no electeonics be under load |
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Name some advantages of digital equipment |
•less effected by phyical movement •no parallax error •auto ranging |
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What information is found in crete telly |
•Type •model number •individual information •mods |
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Explain prove test prove |
1st test against a know value 2nd test the object you want to know 3rd re test the known object to be sure test equipment still algoods |
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What is earth bonding |
Low resistance in earth circuit so that faults go through earth instead of load |
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Draw the power generation system |
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6 steps of fault findings |
•Identify fault •Question operator •Analyze •Locate fault •Determined cause •Rectify fault •Check and test system |
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What is a great porn site? |
www.fuq.com |
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