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Power n Distribution :( > P&D > Flashcards

P&D Flashcards

1
Q

How many Diesel generators are fitted to a Generic Distribution System?

A

4

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2
Q

What does EDC stand for?

A

Electrical Distribution Center

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3
Q

What does MCCB stand for?

A

Moulded case circuit breakers

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4
Q

What are the 5 main breakers in a Generic distribution system?

A
  1. Supply breaker
  2. Shore supply
  3. Bus Bar linking breaker
  4. Interconnector breaker
  5. Feeder breaker
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5
Q

What is the Power book & when is it used?

A
  • Shows the distribution of all 440v services.
  • Used when tracing which services are fed from which fuse panel, transformer, MCCB and EDC
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6
Q

What is the Lighting book and when is it used?

A
  • Shows 115v/230v
  • For tracing systems (Same as power book)
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7
Q

What is the Reference book and when is it used?

A
  • Used in conjunction with power book
  • Lists all fittings, number fitted,componentt symbols & pattern numbers
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8
Q

What is the ratio for 440v fuses regarding fuse discrimination?

A

3:1

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9
Q

Ratio for 115v fuses regarding fuse discrimination?

A

2;1

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10
Q

What is breaker discrimination?

A

With breaker & fuse discrimination, you can’t get a fault on a mess deck kettle to trip a main generator.

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11
Q

What does MCR mean?

A

Machinery control room

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12
Q

What does PCP & SCP mean?

A
  • Primary control position
  • Secondary control position
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13
Q

List 6 meters fitted to a switchboard generator section

A
  1. Voltmeter
  2. Ammeter
  3. KW meter
  4. Frequency meter
  5. Syncroscope
  6. Earth fault indicator
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14
Q

Where are the breaker operating switches found & what are they called?

A

Discrepancy switches
Found In PCP

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15
Q

What are the rules regarding the earthing of the ship when connecting to shore supply

A

It must always be earthed to jetty or ship alongside by at least 2 points

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16
Q

What is used to confirm correct phase rotation with respect to shore supply?

A

The phase sequence indicator (2 lamps) the right one should be brighter

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17
Q

What would happen to a motor if phase rotation is wrong?

A

it would run backwards

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18
Q

Name 3 hand changeover switches

A
  1. Normal/Alt
  2. Normal/Emergecy
  3. N/A/E
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19
Q

Name 3 kinds of changeover switches

A
  1. Hand changeover switch
  2. Automatic Changeover switch
  3. Remote operated changeover switch
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20
Q

Where are 440v earth testing facilities found?

A

Earth indicator light on switchboard, some have audible alarms

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21
Q

Why are there seperate 115v testing facilities?

A

115v is a transformed supply & the secondary winding is not physically connected to the primary winding

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22
Q

What does C&C mean?

A

Control & communications (switchboard)

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23
Q

Define what a converted supply is

A

It has its voltage &/or freq changed form 450v, 60hz

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24
Q

What are the voltages used in the c&c Switchboard?

A
  • 24v DC
  • 115v
  • 400 hz
25
Q

What & where is the earth testing facilities for 24v dc?

A
  • The earth test panel on switchboard
  • It is a push button with intergral lamp fitted to switchboard
26
Q

What does TRU mean?

A

Transformer rectifier unit

27
Q

What does RTR mean?

A

Rationalised transformer rectifier

28
Q

What are the catogories of batteries?

A
  1. Primary
  2. Secondary
29
Q

What are charctaristics of primary batteries?

A
  • Dry cells
  • Not rechargable
  • Small
  • Thrown away when done
30
Q

What are the characteristics of secondary batteries?

A
  • Wet Cells
  • Rechargable
  • require specialist recharging equipment
31
Q

What is the capacity of a battery measured in?

A

amp-hour (ah)

32
Q

What is the voltage of a fully charged cell?

A

2.1v

33
Q

What is the voltage of a discharged cell?

A

1.75v

34
Q

How many Deisel generators are fitted to type 23’s?

A

4

35
Q

What is the output of generators fitted to a 23
& why is it produced?

A
  • 1.3MW
  • 600v
  • 61.2hz
  • 3 phase
  • 450v does not give a large enough range of speeds
36
Q

What are the 7 breakers fitted to a 23?

A
  1. Supply
  2. Interconnector
  3. Shore supply
  4. EMACB
  5. motor generator feeder
  6. motor generator supply
  7. Diesel gen alt supply
37
Q

What does the converter regulator do?

A

Converts & regulates the voltage at 750v DC

38
Q

What is the voltage required for ships services?

A

450v generated by motor generator

39
Q

How may types of electric distribution panels fitted to 23’s

A

3 EDP’s

40
Q

What are shedable services?

A

Provide power to non essential equipment

41
Q

What would happen if you were to loose both motor generators?

A

66v gen can be reconfigured to supply 450v via a 4 postion switch at the back of switch board

42
Q

What 5 services does the emergency switchboard supply?

A
  1. Steering motors
  2. HPSWP
  3. Sickbay
  4. Smoke clearance exhaust fans
  5. Portable pump sockets
43
Q

What are EMACB?

A
  • Electric motor air circuit breaker
  • supplies 600v to electric propulsion motor
44
Q

Why is electric Propulsion prefered when in a sub?

A
  • Reduce noise
45
Q

What SPRM & knots do 2 diesel gens produce?

A
  • 65 SPRM
  • 8-9 knots
46
Q

What SPRM & Knots do 3 diesel gen produce?

A

80 SPRM
10-12 Knots

47
Q

What SPRM & Knots do 4 diesel gen produce?

A

90 SPRM
14 Knots

48
Q

In event of damage to SCC how are propulsion motors controlled?

A

Local control panels (LCP’s)

49
Q

Describe water cooling for propulsion motors

A

Cooled by water cooled air circulated around motor

50
Q

Describe the normal & emergency cooling system for the converter cubicle

A

If heat exchanger fails,2 emergency inlet panels are removed allowing air to be drawn into cabinet by fan

51
Q

When are the navigation lights tested and by who?

A
  • Daily 1 Hour before sunset
  • By the duty ET(ME)
52
Q

Whose permission must be gotten to test navigation lights?

A
  • OOW at sea
  • OOD alongside
53
Q

Where are navigation lights controlled from & switched on & off?

A
  • Bridge
  • Operations room (VCS)
54
Q

List all statutory lights, their colours & location

A
  • Side lights ( Stbd green, port red)
  • Masthead steaming lights (white)
  • Stem lights (white)
55
Q

List the 4 main components of a flourescent light fitting

A
  1. Starter
  2. Tube
  3. Choke coil
  4. Switched supply
56
Q

In the event of action damage to the SCC, how can the propulsion motors be controlled?

A

LCP in machinery space

57
Q

What are the LV and HV filters used for on the type 45 distribution system?

A

The purpose is to smooth & filter the voltage supply

58
Q

What are the 3 special operations lights?

A
  1. NUC-Not-under-command
  2. RAS- Replenishment at sea
  3. MOB- Man overboard

Power n Distribution :( (5 decks)

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