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Pn D Flashcards

1
Q

How many diesel generators are fitted to a generic distribution system

A

4 generator fitted to ship

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2
Q

What does EDC stand for

A

Electrical distribution centre

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3
Q

How many EDC’s are fitted to a generic distribution system

A

4 EDC’s

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4
Q

What does MCCB stand for

A

Moulded case circuit breaker

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5
Q

List 5 breakers fitted to a generic distribution system

A 
Supply breaker
Shore breaker
Interconnecting breaker 
Bus bar linking breaker 
Feeder breaker
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6
Q

What is power book and where is it used

A

Power Book shoes distribution of all 440V services used when tracing which services are fed from which fuse panel, transformer l, MCCB and EDC

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7
Q

What is the reference book

A

The power book lists all the fittings, number fitted, component symbols and pattern numbers

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8
Q

What is the ratio of 440 V fuses regarding fuse discrimination

A

3:1

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9
Q

What is the ratio for 115V fuses regarding fuse discrimination

A

2:1

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10
Q

Explain breaker discrimination

A

The breaker nearest the fault would trip first.

supply breaker being furthest from the fault would trip last.

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11
Q

What does MCR stand for

A

Machinery control room

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12
Q

What does PCP, SCP

A

Primary control position

Secondary control position

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13
Q

List the meters fitted to a switch board generator section

A 
Volt meter
Amp meter 
Earth fault indicator 
Syncroscope 
Frequency meter 
KW meter
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14
Q

Where are the breaker operating switches found and what are they called

A

Discrepancy switches located in PCP

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15
Q

Describe the connection shore supply

A

A permit to work from is raised prior to arrival

The shore supply’s breakers are to be racked out

The shore supply box is cover is removed and connection check for dead

A castle key is obtained from dockyard

Continuity, non contact and insulation resistance tests are carried out on shore supply cables

Shore supply cables are brought onto the ship and secured

Cables are connected to shore supply box

Inform the dockyard who will then switch on the power and ensure correct phase connection

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16
Q

What are the rules regarding to earthing the ship when connection shore supply

A

Ship must always be earthed to the jetty or by the ships alongside by two points. No less than half the ships length apart, plus gangeay

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17
Q

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

A

A phase sequence indicator the right one should be brighter

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18
Q

What would happen to a motor if phase rotation is wrong

A

Motors would run backwards

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19
Q

List 3 types handover switches

A

Normal/alternative
Normal/emergency
Normal/alternative/emergency

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20
Q

List 3 types of switches

A

Hand change over switch
Remote change over switch
Automatic change over switch

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21
Q

What and where are the 440 v earth testing facilities found

A

Earth indicator lights is located on switchboard

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22
Q

Why are the Speer are 115v testing facilities

A

Not physically connected to the primary winding

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23
Q

What does c and c stand for

A

Control and communication

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24
Q

Define what a converted supply is

A

A converted supply has its voltage or frequency changed from 450 v,60 hz

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25
Q

What are the main voltages used in the c and c switchboard

A

24 volts DC

115 volts,400 hertz

26
Q

What and where is the earth testing facilities for 24V D.C

A

An earth test panel on the switchboard provides for testing the positive and negative side of the DC supply

27
Q

What does TRU stand for

A

Transformer rectifier unit

28
Q

What does RTR stand for

A

Rationalised transformer rectifier

29
Q

Batteries fall into 2 categories what are they

A

Primary

Secondary

30
Q

What are the characteristics of the 2 batteries

A

Primary not rechargeable

Secondary- rechargeable

31
Q

What are the capacity of a battery measured in

A

Batteries are measured in amps per hour

32
Q

What is the voltage of a fully charged cell

A

2.1 fully charged

33
Q

What is the voltage of a discharged cell

A

1.75 v discharged

34
Q

How many diesel generators are fitted to type 23

A

There are 4 diesel generators fitted to a type 23

35
Q

What is the output of the generators fitted to a type 23

A

The output is 600V,61.2Hz,3 phase,1.3MW

36
Q

Why do we produce such a voltage

A

450V system would not have given a large enough range of speeds when using the electrical propulsion system

37
Q

What are the breakers fitted to a type 23 p and d system

A 
Supply breakers
Inter connector breaker 
Shore supply breaker 
Electric motor breaker
Motor generator feeder breaker 
Diesel generator alternative supply breaker
38
Q

What does the converter regulated do

A

Convert regulator converts and regulates the voltage at 750VDC

39
Q

What is the voltage required for the ships services and how is it produces

A

450 v required for ships services in s generated by motor generator

40
Q

What are EDPS and how many types are fitted

A

Three types of EDP’s are fitted to a type 23

41
Q

What are shedable services and why do we have them

A

Provide power to non-essential equipment and allow, more power to the propulsion’s motor

42
Q

What would happen if we were to loose both motor generators and how is this achieved

A

The 600V generator can be re-configurated to supply 450V to the 450v system via a 4 position witch to the rear of the switchboard

43
Q

What services does the emergency switchboard supply

A 
Steering motors 
Hp salt water pump 
Sugary 
Smoke clearance exhaust fans
Portable pump sockets
44
Q

What are EMACB

A

Electrical motor air circuit breaker, supplies 600 V to the electric propulsion motor

45
Q

Why is the electric propulsion preferred when involved in submarine warfare

A

To reduce noise, reducing the range and which our ships can be detected and our own interference with towed array sonar operation

46
Q

What SRPM and knots do 2 diesel generators produced

A

2 generation= 65 SRPM

=8-9knots

47
Q

What SRPM and knots do 3 diesel generators produce

A

3 generators= 80 SRPM=10-12 knots

48
Q

What SRPM and knots do 4 diesel generators produce

A

4 generators= 90 SRPM=14 knots

49
Q

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

A

Propulsion motors can be controlled from the local control panels

50
Q

What and where are the 440V earth testing facilities found

A

Earth indicator light is located on switchboard

51
Q

Why are there delegate 115v testing facilities

A

Not physically connected to the primary welding

52
Q

When are the navigation lights tested and by who

A

Lights are testing daily hour before sunset, normally by the duty ETME

53
Q

Whose permission must be gained

A

Permission to switch lights on must be obtained from the OOW/OOD

54
Q

Where are navigation lights controlled from and switched on and off

A

Navigation light control panel, versatile console system

55
Q

List all statutory navigation lights, their colour and location

A

Side lights green and red are starboard and port
The last head steaming light forwards and af(white)
Stern light(white)

56
Q

List all combination of special operation lights

A

Not under command —2 steady lights port 2 steady lights starboard

Replenishment at sea—2 steady lights port and starboard

M.O.B—2 flashing red lights port and 2 starboard vertically mounted on the main mast

57
Q

Where are special operation lights switched from

A

VCS 428 unit

58
Q

List all miscellaneous light anchor lights

A

Anchor lights

Masthead obstruction lights

59
Q

How are the emergency navigation lights fed

A

Emergency navigation lights are fixed in position adjacent to their normal counter parts and are supplied via fixed wiring by two series connected 12 volt batteries

60
Q

Why is it important to switch on the emergency navigation before being hoisted

A

If they are hoisted then plugged in an induced current may be present due to radar and radio aerial interference

61
Q

List 4 main components of a fluorescent light fitting

A

Stater
Tube
Switch supply
Choke coil

P N D (1 decks)

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