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Electrician Training Flashcards

1
Q

The symbol for coulumb is:

A

Q

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2
Q

kV =

A

1000 volts

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3
Q

mV =

A

1/1000 volts

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4
Q

MV =

A

1,000,000 volts

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5
Q

uV =

A

1/1,000,000 volts or .000001 volts

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6
Q

1 coulomb =

A

6.28 x 10 18

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7
Q

1 HP =

A

746 Watts

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8
Q

What is the power equation used when voltage and resistance is provided

A

P = The voltage squared divided by the resistance

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9
Q

What term applies to the use of two or more Generators to supply a common load

A

Parallel operation

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10
Q

DC Generators use slip rings to

A

Slip rings only for AC

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11
Q

Auto transformer starters are Sometimes use with Three phase induction motors to

A

Reduce start up voltage applied to the motor during start

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12
Q

What are the subatomic particles of Individual elements

A

Neutron protons electrons

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13
Q

List two fundamental properties of insulation

A

Dielectric Strength , Insulation resistance

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14
Q

Define the atoms Valence shell

A

The outer layer of an atom

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15
Q

Power wire size listed on ships

A

AWG or Circular mil

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16
Q

What makes up a magnetic field

A

Intensity and density

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17
Q

Highly magnetic material can be used to Shield from magnetic flux interference and is

A

Temporary ring magnetic

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18
Q

Conductors have three or less electrons in their

A

Valence Shell

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19
Q

What is the one-way valve in electrical circuits

A

Diode

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20
Q

Capacitors are measured in units called

A

Farads

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21
Q

Material that are easily magnetized are photo electric materials true or false

A

False

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22
Q

The unit of electrical resistance is the

A

Ohm

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23
Q

The greatest single cause of electrical resistance is the

A

High inductance

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24
Q

Which of the listed device is used to measure pressure and convert it to electrical signal

A

Transducer

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25
Q

Ohm meters are usually used to take resistance reading True or false

A

True

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26
Q

When taking resistance reading the circuit should be energized true or false

A

False

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27
Q

What meter is used to check for continuity of electrical circuits or devices?

A

Ohm meter (measures continuity or open line)

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28
Q

A megohmmeter is Widely used for measuring insulation resistance True or false

A

True

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29
Q

Electric current is the flow of electrons through a conductor the rate of this flow is measured in

A

Amperes

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30
Q

Electrical power is expressed in ohms true or false

A

False

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31
Q

Square root of two equals

A

1.141

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32
Q

a localized electric current induced in a conductor by a varying magnetic field.

A

Eddy Current

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33
Q

Oscilloscope measures

A

Hertz

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34
Q

What type of acid is in the lead battery

A

Sulfuric acid

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35
Q

What physical harm Can in arc flash blast do to you name four things

A

Burns Shrap Metal blinding ear damage

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36
Q

By the IEC (International electrical corporation) What is high voltage

A

1000 V

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37
Q

By the NEC (National electrical corporation) What is high voltage

A

600 v +

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38
Q

What gas is a byproduct of charging lead acid batteries

A

Hydrogen

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39
Q

How many electrons in a semi conductor Valence shell

A

4 electrons

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40
Q

How many electrons are in a Non-conductive insulation valence shell

A

5 to 8 electrons in the valence shell

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41
Q

Conditions that affect magnets adversely

A

Heat and jarring

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42
Q

Fatal shock can be caused with as little as .025 campers 0.1 amp or‘s is likely to be fatal 100ma True or false

A

True

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43
Q

Interrupts the excessive current by melting so that further damage to Personnel and equipment is prevented

A

Fuse

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44
Q

Is automatically operated electrically switch designed to protect personnel and equipment from damage caused by overloadsor short circuits. It’s functions to detect and interrupt circuit current immediately

A

Circuit breaker

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45
Q

Electrical fire agents

A

CO2, dry chemicals ,halogenated extinguishing agent’s

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46
Q

High concentration of Fluxx in core is used to move steel core in

47
Q 
A device Designed to trip a circuit breaker when a fault is detected
Overcurrent
Overvoltage
Reverse power 
Over and under frequency
A

Protective relays

48
Q

Switch gears and protection devices shall be confirmed to

A

IEC publication

49
Q

Is the unit of measure used to measuring frequency as frequency Is measured In cycles per second , so one second equals?

50
Q

a device used In an Electrical Circuit to change alternating current to direct current

51
Q

Cycles per second

52
Q

Capacitance is the property of an electric circuit opposing change in what value of a circuit

A

Voltage in the circuit

53
Q

What is the basic unit of measure for inductance

54
Q

As a property of an electric circuit how is inductance correctly described

A

Opposes any change in the current flow through the circuit

55
Q

A direct current passes through a wire coiled around a soft iron core is known as what

A

Electro magnet

56
Q

An accidental path of low resistance which bypasses the intended resistance and passes an abnormal amount of current is known as what

A

Short circuit

57
Q

In which unit is EMF measured

58
Q

And adjustable resistor whose Resistance can be changed without opening the circuit in which it is connected is called

59
Q

When a main electrical cable is run from the vessels switchboard to a distant light panel it is called a

A

Feeder cable

60
Q

If the motor of the circuit fails to start and gives a loud hum when the start button is pushed what is most likely the problem

A

And open overload OL heater

61
Q

In the Motor controller, the motor fails to start a volt meter reading between one and five reads line voltage while the volt meter reading between two and five reads 0 VAC. What is most likely the problem

A

And open stops switch contact(When not pushed in)

62
Q

The motor fails to start and gives A loud hum when the start button is depressed what should then be your first action

A

Push the start button to De-energize the “M” coil

63
Q

The motor fails to start on an attempt start up. with the start button depressed, a volt meter reading between one and five Indicates line voltage available to the control circuit. what should be your next step in the troubleshooting process

A

Attempt to reset the Overload relay And determine the cause of the overload if applicable

64
Q

The motor starts when the start button is pushed, but stops when the button is released. What is most likely the trouble

A

And open Auxiliary “M” contact

65
Q

GFCI

A

Ground fault circuit inductor

66
Q

Three matching factors to parallel a generator

A

Frequency, Voltage, Phase orientation or Phase are Aligned

67
Q

What determines a generator output voltage? And frequency?

A

The strength of the voltage going through the coils and speed of rotation for the frequency

68
Q

Two shock boundaries

A

Limited and approach boundary

69
Q

Converting (rectifier)

70
Q

Inverting

71
Q

How is a generator output voltage controlled?

A

AVR Automatic voltage regulator

Convert AC to DC current and controls current to the windings on the main pole

72
Q

What determines a transformers ratio

A

The number of turns in a coil

73
Q

Magnet. Conductor. What needs to happen to create

A

Relative motion

74
Q

What device uses magnetic induction to operate

75
Q

What needs to rectify a AC to DC

A

Rectifiers capacitors

76
Q

A commentator is a

A

Slip ring on a DC

77
Q

Temporary ring magnets are extensively used to

A

Shield instruments and components from the effects of magnetic flux

78
Q

What type of material are considered to magnetize easily

A

FerroMagnetics

79
Q

Major disadvantage of a series DC Generator is

A

Output voltage varies as the load varies

80
Q

Lap windings used in AC generators are

A

Does not use an AC generators

81
Q

Which method listed is used to start Field excitation in a DC generator

A

Residual magnetism Remaining in the field poles

82
Q

Magnetic induction occurs when there is Relative motion between What two elements

A

Magnetic field And conductor

83
Q

What are two basic types of alternators

A

Rotating Armature and rotating field

84
Q

The use of a shunt in an ammeters For measuring current provides

A

Low Resistance to keep higher Currents From the meter coil

85
Q

Ferromagnetic material can be used to Focus the

A

Flux in the core of the transformer

86
Q

What are the three categories (material properties ) Of elements that refer to their interaction with electricity

A

Conductor, semi conductor, insulator

87
Q

Line voltage equals the phase voltage in the

A

Delta configuration

88
Q

Convert 0.5A to mA

89
Q

If you’re going to bring up another generator to the electrical ring bus you’re going to have to

A

Close your breakers (generator circuit breaker) Then parallel the generator to the electrical ring bus

90
Q

And Adam that loses or gains electrons is

91
Q

Is the unit of capacitance

92
Q

Is the unit of inductance

93
Q

A current of .2 campers or greater can cause

A

Death severe burns unconsciousness

94
Q

Heat stress condition if you’re in a space 100° and above you must be out of the space

A

Double the amount that you were in the space ( if you’re in a space for eight hours at 100° you must be out of the space for 16 hours in order for your body to recover if the space humidity is 90% but the space temperature is 97° constitute you must be out of the space double the amount of time you’re in the space

95
Q

What are the three things that causes electromagnetic induction

A

Conductor, flux and relative motion

96
Q

What are the three classifications of DC generators

A

Series, shunt, compound

97
Q

Magnetic induction occurs when there is relative motion between what two elements

A

Magnetic field and conductor

98
Q

A Voltage of a generator is at 325 that has no load, And 300 at full load, what is the Generators voltage regulation

A

E no load minus E full load Multiply by 100 equals regulation (Refer to page 20 lesson 32)

99
Q

If A step down transformer has a ratio of 8 to 1 and the secondary is 3 amps and the Primary voltage is 230 V AC what is the power on the load

A

86.25 Not sure if this is right

100
Q

How do you change the frequency of a AC generator

A

Change the speed of them input motor

101
Q

Inner poles Accomplish the same thing as

A

Compensating windings Refer to page 7 lesson 33

102
Q

A inductive reactance load is expressed in

A

Ohms Reactance is resistance

103
Q

Auto transformers help start motors by

A

Reducing the voltage applied to the motor during the start up period

104
Q

What causes a voltage to develop across a secondary winding of a transformer

A

A magnetic line generated by the current in the primary cuts the secondary winding because it creates Fluxx and inducing a voltage

105
Q

When copper is heated electric current is

A

Reduced when copper is heated resistance goes up

106
Q

A battery rated at 400 amp hours with a specified discharge rate of 20 Amps Will last for how many hours at 5 amp discharge rate

A

80 hours (400/5 =80)

107
Q

Why is it necessary to take airgap readings on motor generator equipment

A

Bearings can wear and introduce uneven fluxx coupling

108
Q

What are the two main types of cores used in transformers

A

Shell type and hollow type

109
Q

What’s best used on ships stranded wire or solid wire

A

Stranded wire

110
Q

INTERPOLes compasate

111
Q

What is the minimum charge of a battery

112
Q

Tool to check battery fluid

A

Hydrometer

113
Q

Two temperature sensing device aboard ships

A

Resistance thermal Device (RTD) thermal sensing device

114
Q

What is the primary determining factor in selecting a conductor size

A

The current carrying capacity is based on its physical size

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