USCG > USCG ELECTRICAL > Flashcards

USCG ELECTRICAL Flashcards

(58 cards)

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1
Q

Never operate any personal electrical equipment without the authorization of…..

A

XO or EO
The executive officer
or the engineering officer

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2
Q

Which officers expressed permission is required to work on live circuits?

A

Commanding Officer

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3
Q

What level of shock from a 60 Hz AC system can be fatal if it last for one second or more?

A

100 Milliamperes (0.1A)

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4
Q

What is the main reason we ground power tools, and equipment?

A

Safety

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5
Q

When at sea, what is more fatal and damaging to both personnel and the ship itself than damage from battle?

A

Electrical Fires

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6
Q

Which firefighting agent is Not recommended for electrical fires because it causes corrosion of electrical and electronic components?

A

PKP
potassium Bicarbonate
Purple potassium powder

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7
Q

How many classes of rubber insulating gloves are there?

A

4 classes

Note: for additional information on electrical rubber gloves refer to NSTM chapter 300

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8
Q

As_______move from one atom to the next, an electric current is produced.

A

Electrons

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9
Q

What are materials that offer Low Resistance to the flow of electricity?

A

Conductors

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10
Q

What are materials that offer High resistance to the flow of electricity?

A

Insulators

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11
Q

What is the most common material used for conductors?

A

Copper

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12
Q

What type of material can be used to manufacture devices that have characteristics of both conductors and insulators?

A

Semi-conductor

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13
Q

If an atom has an excess of electrons, it is considered to have a _______charge

A

Negative

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14
Q

What is the flow of free electrons in a conductor from one atom to the next in the same general direction? What is this referred to as?

A

Current

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15
Q

How many volts is considered fatal on a ship?

A

115 volts

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16
Q

What does connecting batteries in parallel do?

A

Up the amperage

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17
Q

What does connecting batteries in series do?

A

Up the voltage

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18
Q

Electrical panels with 600 V or less need to have a safety perimeter of….

A

3 feet or 36 inches

Note:
Also needs dielectric floor matting and a dead man stick

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19
Q

What is the force required to make electrons flow through a conductor, resulting from an absence of electrons on one end of the conductor and an excess at the other?

A

Electromotive force (EMF) or more commonly known as Voltage

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20
Q

What are two conditions that must be satisfied for current to flow through a person?

A
  1. A person must form part of a closed circuit in which current can flow
  2. there must be a difference in potential to cause current to flow
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21
Q

Class 2 rubber gloves have a maximum safe voltage of….?

A

17,500 Volts

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22
Q

Which type of extinguisher is effective on any type of fire especially electrical fires?

A

CO2 gas

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23
Q

The electron flow concept states that electrons flow from….

A

Negative to Positive

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24
Q

The rate at which work is done is called Power and is represented by the symbol “P”. What is Power measured in?

25
List 3 basic components of a simple electric circuit
1. Voltage source = battery 2. Load = lightbulb 3. Conductor = electrical wire
26
The property of a component to oppose the flow of electrical current through itself is known as….
Resistance
27
The property of a component to oppose any change in voltage across its terminals by storing and releasing energy in an internal electric field in know as….
Capacitance
28
The property of a component to oppose any change in current through itself by storing and releasing energy in a magnetic field surrounding itself is known as….
Inductance
29
Whenever there is an electrical charge in motion or an electrical current flowing in a conductor…. this creates what?
Magnetic field
30
What is the difference between an electromagnet and a permanent magnet?
Unlike a permanent magnet, electromagnets can be turned on or off and are only magnetized when current is flowing through them
31
What two ways can voltage be generated?
1. Movement between a magnet and a conductor 2. Changing the magnetic field
32
What meter would provide the most adequate test for insulation breakdown?
Megohmmeter (Megger)
33
Which DC circuit sends current to the battery to maintain the battery’s state of charge?
Charging circuit
34
Why is additional test equipment required when testing pressure and temperature switches or sensors?
To simulate pressure or temperature
35
How can components be isolated from wiring and other components?
By tripping a breaker, opening a switch, or disconnecting the component
36
What 2 types of checks are performed for troubleshooting?
1. Visual 2. Operational
37
What are the 2 common methods for isolating a problem within a system?
1. Half-split method 2. Section-by-section method
38
What are the output volts and amps for two 6 Volt, 100 amp batteries connected in parallel?
6 Volts, 200 Amps Note: This connection is usually found on small boats with outboards
39
What are the output volts and amps for two 12 Volt, 200 Amp batteries connected in series?
24 Volts and 200 Amps Note: This connection is usually found on larger boats with diesel engines
40
Why should only distilled water be added to battery cells?
Ordinary tapwater contains impurities, which can shorten battery life
41
The Hydrometer reading or specific gravity of a fully charged battery is…..
1.260 to 1.300
42
What are the 4 types of charges that may be given to a storage battery depending upon the condition of the battery?
1. Initial charge 2. Normal charge 3. Equalizing / Boost charge 4. Floating charge
43
What is the FIRST step for installing a battery?
Determine polarity of battery terminals
44
What does the battery load tester evaluate?
It evaluates the batteries ability to supply sufficient current to the standby supply or other electronic devices
45
How do you determine the American wire gauge (AWG) size for a wire?
I’m measuring the diameter of the conductor “the bear wire” with the insulation removed using a wire gauge
46
What gauge wire should be used for a 12 Volt circuit that is 10 feet long and carries 20 Amperes?
You need to use the wire gauge selection cheat sheet to find the answer. In this case, the answer is 16 gauge wire
47
What connector is commonly used to replace the rattail joint splice?
Wire nut Note: put the 2 wires into the wire nut and twist. Twisting them together in a spiral form helps hold them together
48
A bright yellow 💛 terminal lug or splice insulator will be used on what wire sizes?
#26 to #24
49
A red ❤️ terminal lug or splice insulator will be used on what wire sizes?
#22 to #20 and #18
50
A blue 💙 terminal lug or splice insulator will be used on what wire sizes?
#16 to #14
51
A dull yellow 🧡 terminal lug or splice insulator will be used on what wire sizes?
#12 to #10
52
What is the Final step in completing a splice or connection?
Place insulation over the splice. common insulators are… 1. heat shrinkable tubing 2. rubber tape 3. friction tape 4. electrical tape 5. electrical coating
53
When the voltage and current wave forms are in step with each other, They are said to be in….
Phase
54
Which portion of the AC motor creates a rotating magnetic field when current is applied?
Stator
55
What is the major advantage of a 3 phase motor as compared to a single phase motor?
The 3 phase motor is self starting
56
Which motors are specifically designed to maintain constant speed with the rotor?
Synchronous
57
Which winding fault is the result of 2 windings making contact?
Short
58
What are the 2 main benefits of using an engine heater “hotstarts”?
1. Easier starts 2. Reduces engine wire Note: Easier Starts save time and fuel, prolong battery life and improve starting reliability for emergencies. Hotstarts stop destructive condensation by keeping jacket water temperature warm.
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