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P N D > P n D > Flashcards

P n D Flashcards

1
Q

5 switchboard meters

A

Voltmeter
Frequency meter
Watt meter
Ammeter
Syncroscope

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2
Q

What are fitted to edc

A

Mccb

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3
Q

450v each faults indicate automatically why is this not possible with 115 v

A

Because there’s an air gaps within the transformers

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4
Q

Describe breaker discrimination

A

The fuse or breaker closest to the to the equipment will fail first to protect the power source

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5
Q

6 switchboard indicator lights

A

Control available/not available,
generator running,
fire detected,
over temperature,
breaker trip
earth fault

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6
Q

What does RTR n TRU

A

Rationalised transformer rectifier
Transformer rectifier unit

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7
Q

Output from type 23gen

A

1.3MW 600v 61.2hertz and 3 phase

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8
Q

What is the 440v supply book

A

Power book

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9
Q

What is the 115/230 v book

A

Portable apparatus book

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10
Q

What is the fittings and equipment book called

A

Reference book

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11
Q

What is pcp and what can be operated from it

A

Primary control position
Main breakers
Generator voltages
Anti condescension

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12
Q

Presence of an earth is indicated in what 2 ways

A

Indicator light
Audible alarm

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13
Q

Two types of batteries

A

Primary and secondary

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14
Q

What is the characteristic of the primary batteries

A

Not rechargeable and once discharged they are thrown away

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15
Q

9 steps to bring on shore supply

A

Send signal to port
Raise permit to work
Rack out breakers
Prove box is dead
Obtain castle key
Test shore supply cables
Bring on and secure cables
Connect cables
Inform dockyard

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16
Q

What is the purpose of earth bonding

A

To safeguard personnel should equipment casing become live creating a path of least resistance to earth

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17
Q

Characteristics of secondary cell

A

Rechargeable and require specialist charging equipment

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18
Q

What is a battery capacity measured in

A

Amps per hour

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19
Q

3 main purposes of C and C

A

RICE
Diesel engine starts
Compasses

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20
Q

Where is the breaker operating switch and what is it called

A

Located in pcp and called discrepancy switch

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21
Q

Control and communication switchboard provides

A

24vdc and emergency supplies 115v and 400 hertz

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22
Q

What is converted supply

A

A voltage/frequency change from 440v

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23
Q

What is rice

A

24vdc,115v,400hertz,1 phase

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24
Q

Rules when connecting ashore

A

Ship must be earthed at 2 points no longer than half the ships length

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25
Q

How to earth at SS

A

-Earth jetty
-Earth to ship along side
-Gang ways are to be earthed
-at 2 points no less than half the ships length

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26
Q

3 categories of changeover switches

A

ACOS-automatic
ROSCOS-remote operated
HCOS-hand

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27
Q

All rn ships can

A

-Receive power from SS
-Receive power from other ship
-provide power to another ship or Shore side

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28
Q

5 meters

A

Volt meter
Frequency meter
Watt meter
Syncroscope
Ammeter

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29
Q

What is the breaker operating switch

A

Discrepancy switch located in pcp

30
Q

What is the reference book

A

Stores numbers,types of fittings and number of fittings

31
Q

Requirement for main electrical system

A

Prime mover
Generator
Switchboard

32
Q

What is the Earth testing for c and c switchboard

A

Push button with integral lamp

33
Q

What is the lighting book

A

230/115 volts supply

34
Q

Output of a type 23 gen

A

1.3mw , 600v ,61.2hertz,3 phase

35
Q

What is voltage difference between charged and discharged batteries

A

2.1v charged
1.75 discharged

36
Q

When are nav lights tested

A

Tested Daily an hour before sunset

37
Q

Who’s permission do u need to switch lights

A

OOD/OOW

38
Q

How to control nav lights

A

NLCP-nav lights control panel

39
Q

Where are the 2 control panels

A

Bridge-vcs 428
Operation room-vcs 161

40
Q

What are the stationary nav lights

A

Side lights-red and green
Mast head steaming light-white
Stern light-white

41
Q

How are the emergency nav lights powered

A

Two series connected 12 volt batteries

42
Q

Special operations

A

Not under command-NUC
Replenishment at sea-RAS
man overboard-MOB

43
Q

What must u do before hoisting up emergency lights

A

Plug them in and switch them on

44
Q

What are the 2 miscellaneous lights

A

anchor lights
Masthead obstruction lights

45
Q

4 components to fluorescent lighting

A

Starter
Tube
Choke coil
Switched supply

46
Q

Parts to fluorescence lighting operation(drawing)

A

Ac supply
Choke
Mercury
Electrode
Starter switch
Phosphor casing
Pins
Argon gas

47
Q

Parts to type 23 AEL

A

Base casting
Pcb retaining clip
Battery retaining clip
Battery 2.4 volt
Terminal block

48
Q

Two types of edp

A

ROCOS and shedable

49
Q

Converter regulator does what

A

Coverts and regulates the voltage at 750vdc

50
Q

Why do is 600 volts and not 450

A

450 v would not give a large enough range of speeds when using electrical propulsion

51
Q

What are the emergency switchboard uses

A

Steering motors
Hpswp
Sickbay
Smoke clearance exhaust fans
Portable pump sockets

52
Q

2 gen
3 gen
4 gen

A

65 srpm
80 srpm
90 srpm

53
Q

Describe electrical propulsion motor cooling flow

A

Air is drawn in through cooling fans and goes through air filter n air goes through poles,armature,commutator and brush gear and then goes through air cooler and out to machinery space

54
Q

Propulsion motors can be controlled from

A

Local control panel

55
Q

Where a the two panels for NLCP

A

Bridge-vcs 428
Operations room-vcs 161

56
Q

What is a converted supply

A

A supply Has its voltage and or frequency changed from 440v

57
Q

Earth testing facility for 24vdc

A

Integral lamp

58
Q

Breakers fitted to type 23 p and d system

A

Interconnector breaker
Supply breaker
Motor generator supply breaker
Motor generator feeder breaker
Electric motor breaker
SS/SA breaker,
alternate supply breaker

59
Q

What are shedable edps

A

They provide power supplies to non essential equipment

60
Q

What would happen if we were to loose both motor generators

A

Re-configured to 450v and switched at the rear of the switchboard

61
Q

What does the emergency switchboard supply

A

Steering motors
HPSWP
sickbay
Scef
Portable pump sockets

62
Q

What are EMACB

A

Electric motor air circuit breaker

63
Q

What are LV and HV filters used for on type 45

A

Harmonic filters are used to smooth and filter the voltage supply

64
Q

Voltage supply to type 45 gens

A

4,160v,60hz,3phase and 21MW

65
Q

Pms and epms

A

Platform management system
Electric power management system

66
Q

Describe cooling system for propulsion motors

A

Cooled through water cool air and sent around the motor

67
Q

Describe normal and emergency cooling system for converter cubicle

A

If heat exchanger fails 2 emergency panels are removed to allow air in

68
Q

Voltage required for ships service and how is it produced

A

440v and from motor generator

69
Q

Why is it important to switch on and plug in emergency lights before hoisting them

A

If hoisted then plugged in a induced current may be present due to radar and radio interference

70
Q

Earth testing for 24vdc

A

Integral lamps

71
Q

What are edps and how many type are fitted

A

Electrical distribution panel and 3 types

P N D (1 decks)

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