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P&D > General Systems > Flashcards

General Systems Flashcards

1
Q

How many diesel generators are fitted to a general system?

A

4

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2
Q

What does EDC stand for

A

Electrical distribution centre

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3
Q

How many EDC does a general distribution system have

A

As many as required

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4
Q

What does MCCB stand for

A

Moulded case circuit breaker

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5
Q

5 main breakers in a general distribution system

A

Supply breaker
Feeder breaker
Bus bar linking breaker
Interconnecting breaker
Shore supply breaker

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6
Q

What is a supply breaker

A

Goes from a supply to a bus bar

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7
Q

What is a feeder breaker

A

Goes from a bus bar to kit/equipment

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8
Q

What is the power book

A

Shows the distribution of all 450v services

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9
Q

What is the lighting book

A

Shows all distribution of 115v lighting

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10
Q

What is the reference book

A

Shows all part numbers and quantities

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11
Q

440v discrimination ratio

A

3:1

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12
Q

115v discrimination ratio

A

2:1

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13
Q

What is breaker discrimination

A

When the closest breaker to the fault is the first to trip

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14
Q

What does MCR stand for

A

Machine control room

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15
Q

What are PCP and SCP

A

Primary control position
Secondary control position

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16
Q

What meters are fitted to a switchboard (5)

A

Volt meter
Ammeter
Frequency meter
Watt meter
Syncroscope

17
Q

What are the breaker operating stitches on the switchboard called (4)

A

Discrepancy switch
Start/stop switch
Selector switch
Control switch

18
Q

What is the process of connecting a shore supply

A
  1. Send a signal 24 hours before
  2. Raise permit to work
  3. Rack out breakers
  4. Test for dead
  5. Get the castel key
  6. Test shore supply cables
  7. Bring on and secure cable
  8. Connect cables
  9. Infirm dockyard
19
Q

Where is a ship earthed

A

Gangway
No less then half the ships length

20
Q

What is used to confirm correct phasing

A

The light on the right is bright

21
Q

What would happen to a motor if phasing was incorrect

A

The motor would spin backwards

22
Q

3 hand change over switches

A

Normal/Alternative
Normal/Emergency
Normal/Alternative/Emergency

23
Q

3 kinds of change over switch

A

Automatic change over switch (ACOS)
Remote change over switch (RCOS)
Hand change over switch (HCOS)

24
Q

What and where are the 440v earth testing facilities found

A

Control positions
Lamp and audible alarm

25
Q

Why is there a separate 115v test

A

Because of the transformer there is no physical connection

P&D (5 decks)

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