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Sattler > Power Distribution / General Electrical / Power Tools > Flashcards

Power Distribution / General Electrical / Power Tools Flashcards

1
Q

What do you use to discharge a capacitor?

A

A shorting probe across the terminals of the capacitor or the built in grounding bar.

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2
Q

What is the length rule for extension cords?

A

Only allowed to connect 2 25’ long cord and 1 100’ cord is permissible.

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3
Q

When working on electrical equipment you must have __________________ qualified person observing.

A

CPR

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4
Q

Primary power distribution voltage, phase and frequency is?

A

450V, 3 phase, 60 Hertz

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5
Q

Max voltage for a ship’s main switchboard should never exceed _________ volts?

A

462 volts

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6
Q

Shore power cables are rated for _______ amps?

A

400

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7
Q

Indicator RED lamp means?

A

Danger or emergency

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8
Q

Indicator GREEN lamp means?

A

Normal condition

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9
Q

Indicator WHITE lamp means?

A

Power available

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10
Q

Indicator BLUE lamp means?

A

Closed/Advisory

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11
Q

Indicator CLEAR lamp means?

A

Synchronizing or Ground detection

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12
Q

Indicator YELLOW lamp means?

A

Abnormal, but not requiring immediate attention.

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13
Q

What is a bus tie used for?

A

Used to connect or disconnect one bus, such as that in a switchboard, to another bus.

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14
Q

How do you minimize the loss resulting from eddy currents in a transformer?

A

Laminate the windings

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15
Q

What system are ACB breakers used on?

A

Ships service and emergency generators to the power distribution system, bus ties, shore connection circuits.

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16
Q

What is an NLB breaker essentially?

A

An off/on switch

They have no automatic tripping device

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17
Q

What does “trip free” mean?

A

A breaker that will remain open, even if the mechanism is held in the closed position.

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18
Q

Grounds can’t be detected through what?

A

A transformer

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19
Q

Power factor of 100% means the circuit is purely ________?

A

Resistive

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20
Q

UPS prevent ___________ outs.

A

Brown

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21
Q

A ___________ is a device without moving parts that transfers energy from one circuit to another by electromagnetic induction.

A

Transformer

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22
Q

Permanent magnet movement is known as the ___________ movement.

A

D’Arsonval

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23
Q

Shore power cable can be spliced, true of false?

A

True

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24
Q

The distance between cable supports should not exceed how many inches?

A

32”

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25
Q

What amperage does a GFCI trip?

A

4mA or higher

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26
Q

What is the unit of measure for Capacity?

A

Fared

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27
Q

The 4th band of a resistor indicates?

A

Tolerance

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28
Q

In a step up transformer voltage ________________ and current _______________?

A

Increase and decrease

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29
Q

Cathodic protection system prevents ________ and ________ on the ships hull.

A

Corrosion and rusting

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30
Q

The efficiency of most transformers are ___% to ___%?

A

97-99

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31
Q

All deep fat fryers must be what type of circuit breaker?

A

Shunt trip

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32
Q

Which circuit breaker is used to protect single load circuits and all feeder circuits coming from a load center distribution panel?

A

AQB

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33
Q

Which type of transformer receives electrical energy at one voltage and delivers it at the same voltage?

A

Isolation

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34
Q

For shipboard the shore tie cable must be? List all the factors!!!

A 
3 conductor
Flexible
Unshielded
600 volt
THOF-400 or 500
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35
Q

What type of transformer isolates instruments from line potential and produces in the secondary a definite fraction of the primary current thereby making it possible to measure large currents with a five ampere ammeter?

A

Current transformer

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36
Q

A rheostat is basically what?

A

A variable resistor

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37
Q

Resistive wire wrapped around a cylindrical core, with a wiper moving over the surface of the wound wire core to vary the resistance within the circuit, describes a ________?

A

Rheostat

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38
Q

What component is defined as the 3 terminal variable resistor where the center connection is manipulable?

A

Potentiometer

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39
Q

Which meters are usually the only instruments provided for DC distribution systems?

A

Voltmeters and ammeters

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40
Q

A ____________ is a three terminal variable resistor where the center connection is manipulable?

A

Potentiometer

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41
Q

What voltage is class 0 rubber glove?

A

1000 volts

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42
Q

What voltage is class 1 rubber glove?

A

7500

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43
Q

What voltage is class 2 rubber glove?

A

17,500

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44
Q

What voltage is class 3 rubber glove?

A

26,500

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45
Q

Which type of breaker can be both manually ad electrically operated?

A

ACB

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46
Q

Number of strands that can be broken or nicked

Less then 7
7-15
16-18
19-25
26-36
37-40
41 or more
A 
0
1
2
3
4
5
6
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47
Q

From any conductor in a power tool to ground of any part of the casing of the tool you should read?

A

Greater then 1 meg ohm

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48
Q

What resistance should you read between the case and the ground/hull of a ship?

A

1 ohm or less

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49
Q

What do the dots on a electrical drawing of a transformer represent?

A

They tell which way the phase is going throughout the coil. It lets you know how current is following at a glimpse of looking.

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50
Q

Resistor color code, do it up!

A

(0) Black
(1) Brown
(2) Red
(3) Orange
(4) Yellow
(5) Green
(6) Blue
(7) Violet
(8) Grey
(9) White

Gold is 5%
Silver is 10%

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51
Q

What 2 pronged piece of equipment is allowed to be plugged into a receptacle that reads “warning: insert three prong grounded plugs only”

A

Double insulted tools

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52
Q

How long does a ground on a 3 plug cord have to last?

A

The life time of the tool/piece of equipment.

53
Q

How often is should a switchboard be de-energized, throughly inspected, and cleaned?

A

Yearly

54
Q

What is the maximum splices in a cable run?

A

2

55
Q

What does the bus transfer system provide?

A

2 sources of power to equipment that is vital to the ship.

56
Q

What precaution must be taken when testing bus transfer equipment?

A

Ensure any vital or sensitive loads are on backup

57
Q

Circuit breakers provide the power distribution system with what 3 functions?

A

Normal switching operation, circuit protection, and circuit isolation.

58
Q

Which circuit breaker is used to protect single load circuits.

A

AQB

59
Q

Which type of transformer receives electrical energy at one voltage and delivers it at the same voltage?

A

Isolation

60
Q

What would cause failure of the overcurrent device to trip the switchboard circuit breaker?

A

Insufficient trip travel

61
Q

What meters are usually the only instruments provided for DC distribution systems?

A

Voltmeters and ammeters

62
Q

Voltmeters and potential coils of watt meters are connected?

A

Either across the voltage to be measured or the secondary of a potential transformer

63
Q

When testing portable tools you must test them with the switch in the?

A

On and off position

64
Q

Which type of switch requires the physical contact of an object with the switches activator to make the contacts change state?

A

Limit switch

65
Q

For cable and conductor termination within an enclosure, how many conductors can be attached per lug?

A

1

66
Q

Coaxial connectors exposed to weather elements , shall be weatherproofed within _____ hours after assembly?

A

24

67
Q

What do the 4 lines mean on a resistor?

A

1 and 2 determine number
3 is the amount of 0’s (multiplier)
4 is the tolerance

68
Q

How many strands of the conductor can be broken or nicked in the following?

7
7-15
16-18
19-25

A

0
1
2
3

69
Q

What % over the load should fuses be on motors?

A

250-400%

70
Q

What are the 3 types of transformers?

A

Air core
Iron core
Soft iron

71
Q

Max voltage for class 4 gloves?

A

36,000

72
Q

No more then _____ row(s) of cables should be installed on a single hanger?

A

1

73
Q

A circuit breaker relay magnet that chatters is caused by what?

A

Rusty sealing surface

74
Q

The most common cause of controller contacts welding together is what?

A

Low voltage

75
Q

The height of a kick pipe including the stuffing tube is ___” minimum and ____” max?

A

9

18

76
Q

___________ is the measure of electron flow?

A

Current

77
Q

______ type controllers must be manually restarted after electrical power has been restored?

A

LVP

78
Q

______ type controllers will automatically started after electrical power has been restored?

A

LVR

79
Q

Frequent welding of contacts can be avoided by using ________ contacts.

A

Silver

80
Q

the primary purpose of PMS of electrical cable is to preserve what?

A

Insulation resistance

81
Q

Arc chutes should be cleaned with a ______ and scraped with a ______?

A

Cloth and file

82
Q

Transformers are rated by _____?

A

KVA

83
Q

What is a varistor used for?

A

Protect circuits from voltage surges

84
Q

The half moon shape on a capacitor tells you what?

A

The positive side

85
Q

What designates the mark of the primary terminals and the secondary terminals that have the same instantaneous polarity?

A

A dot

86
Q

Max tiers of a bulkhead wire run?

A

2

3 with NAVSEA approval in close quarters

87
Q

Cable banding is how wide?

A

5/8”

88
Q

How much slack is allowed in a cable run from hanger to hanger?

A

1”

89
Q

What are the 3 spacing distances between wire hangers?

A

12, 21, 32

90
Q

Max tiers for cable runways in the overhead?

A

5

91
Q

Shore tie insulation is tested on what voltage of a megger?

A

500 volts

92
Q

If you have 2 shore ties, they must be the same length why?

A

For voltage unbalance

93
Q

What is another word for power loss in the run of a cable?

A

Attenuation

94
Q

What does the AQB-LF250 breaker have that the AQB breaker does not?

A

Fuse

95
Q

What is the description of an ALB breaker?

A

Low voltage

Automatic tripping

96
Q

The NQB-A250 breaker is similar to what other breaker?

A

AQB-A250

But…

It has no automatic tripping device!

97
Q

What breaker is the NLB breaker similar to and what is the description of it?

A

Same as the ALB breakers

But…

They have no automatic tripping device!

It’s basically an on/off switch!

98
Q

What 2 breakers are considered an on/off switch due to manual operation only?

A

NQB and NLB

99
Q

What substances should you never clean electrical equipment with?

A 
Alcohol
Gasoline
Benzene
Ether
Carbon tetrachloride
Emery cloth
Steel wool
100
Q

What substances are SAFE to use to clean electrical components?

A

Water based solvents
Non-volatile substances

When not possible to clean with these then you can use…

Inhibited methyl chloroform, in a well ventilated space

101
Q

What are the classifications of cable types?

A

Special purpose
Nonflexing service
Repeated flexing service

102
Q

What is the purpose of aluminum or steel covering of armored cable?

A

To give physical protection to the cable sheath during installation.

103
Q

What is the purpose of using nonflexing cables?

A

Permanent installation

104
Q

Repeating flexing service cable is designed to be used on what type of equipment?

A

Portable tools

105
Q

Repeated flexing cable is categorized by what means?

A

Number of conductors in the cable

106
Q

If you see the symbol HOF on a cable designation, what does this mean?

A

Heat and oil resistant, and its flexible

107
Q

A cable is listed in the cable comparison guide has a 7 at the end of the cable designation, what does this mean?

A

The # of conductor pairs and the circular mils of the conductor only

Or

The number of conductors, the number of conductor pairs, and the circular mils.

It depends on the type of cable…

108
Q

LSDHOF-400

What does the D mean and what does the 400 mean?

A

2 conductors

And

Conductor expressed in thousands of circular mils

109
Q

A cable has been constructed to add protection against fire, what type of cable does this explain?

A

Circuit integrity

110
Q

When installing a replacement cable for a particular install ion, you must know all except?

A

The number of bends in the cable

111
Q

Why do you want to keep cable runs as short as possible?

A

To keep attenuation to a minimum

112
Q

What letter indication do the following mean in reference to cable markings?

EL
N
L
CP
EP
P
CPS
G
PP
A 
Emergency lighting
Navigation lighting
Ship lighting
Casualty power
Emergency power
Ship service power
Cathodic protection
Fire control
Propulsion power
113
Q

What manual would you find the exact way of installing cable?

A

Cable comparison guide

114
Q

What type of meter would you use to test insulation resistance?

A

Megger

115
Q

Neutral polarity in a conductor is identified by what color?

A

White

116
Q

The marking system for power and lighting cables is shown in what order?

A

Source
Voltage
Service

117
Q

Let’s break down these cable markings….

X-XX-XX)-24-A(2
(X-XX-XX)-4P-B(1)

A

Deck
Frame
Port or starboard

If less then 100 volts, it will display actual voltage, so 24 volts
If its just a single digit its the range in hundreds, so 4 would be 400-500.

Letters represent what breaker in order

Last number represents section of a power main with more then one section.

118
Q

What is a way to keep your cable runs neat in appearance?

A

Lace them together

119
Q

What is the purpose of insulation on cables?

A

Isolates current carrying conductors of other circuits or equipment

And

Insulates points of unequal potential from one another

120
Q

Electrical insulting materials are classified according to what characteristic?

A

Their temperature index

121
Q

The most common insulations for cable are classes….

A
B
C
O

Name them

A

Cotton, paper and similar organic materials that are impregnated or immersed in liquid dielectric

Mica, asbestos, fiberglass etc…

Glass, quartz, tics, etc…

Paper, cotton, thats not impregnated or immersed

122
Q

What is selective tripping?

A

Isolates faulty circuits with interrupting other associated circuits

123
Q

When testing a ground receptacle, what is the maximum acceptable resistance from the ground connection to the hull?

A

Less then 1 ohm

124
Q

At what interval should the connections of new electric wiring be tested?

A

Before being used for the first time!

Don’t confuse this with when do you PMS portable tools or when do you inspect a tool when you get issued it.

125
Q

What NSTM would you refer to for electrical matting on decks?

A

NSTM 634

126
Q

What is the distance for electrical matting from any electrical hazard?

A

3 feet

127
Q

How many amps are lethal?

A

.1 to .2 amps

128
Q

What is the function of the switchboard bus ties?

A

To permit switchboards to be cross connected and to allow paralleling of generators.

Sattler (28 decks)

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