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Oral > General Oral > Flashcards

General Oral Flashcards

1
Q

What constitutes a capacitor?

A

Two conductors separated by an insulator

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2
Q

What is the purpose of a capacitor?

A

Stores electrical energy

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3
Q

What is the basic unit of capacitance?

A

The farad

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4
Q

Why should electrolytic capacitors not be used in an AC circuit?

A

They are polarized / passes current of one polarity but will block opposite polarity

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5
Q

What is meant by inductance?

A

Ability to store electrical energy in electromagnetic fields

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6
Q

What is the basic unit of inductance?

A

The henry

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7
Q

Does a capacitor in an AC circuit cause the current to lead or lag the voltage?

A

Lead

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8
Q

Does an inductor in an AC circuit cause the current to lead or lag the voltage?

A

Lag

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9
Q

What is the basic unit of power in a DC circuit?

A

The watt

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10
Q

What happens to the current in a DC circuit if the voltage is increased but the resistance remains the same?

A

It increases

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11
Q

What are five sources of electrical energy?

A

Magnetism, Chemical energy, light, heat and pressure

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12
Q

Which law of electricity is the most important for an aircraft mechanic to know?

A

Ohms law

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13
Q

What are the elements of ohms law?

A

Voltage, Current and Resistance

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14
Q

What is the name of the law that describes the relationship in an electrical circuit of voltage, current and resistance?

A

Ohms law

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15
Q

What is the basic equation of Ohms law?

A

E= I x R

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16
Q

What is the formula for determining power?

A

P= I x E

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17
Q

What is meant by a kilowatt?

A

1,000 watts

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18
Q

What is meant by a magawatt?

A

1,000,000 watts

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19
Q

What instrument is used to measure current flow?

A

Ammeter

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20
Q

What is a megohm?

A

One million ohms

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21
Q

What instrument is used to measure electrical resistance?

A

ohmmeter

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22
Q

When measuring resistance of a component with an ohmmeter should the circuit be energized?

A

No

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23
Q

What instrument is used to measure continuity in an electrical circuit?

A

Ohmmeter

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24
Q

What units is battery capacity expressed?

A

Ampere hours

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25
Q

What instrument is used to measure the specific gravity of the electrolyte in a lead acid battery?

A

Hydrometer

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26
Q

What is voltage?

A

Electrical pressure

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27
Q

What is the basic unit of voltage?

A

The volt

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28
Q

What instrument is used to measure voltage?

A

Voltmeter

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29
Q

To measure voltage is a voltmeter placed in series or in parallel with the source of voltage?

A

Parallel

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30
Q

What is the voltage across each resistor connected in parallel across a 12 volt battery?

A

12 volts

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31
Q

What is the open-circuit voltage of a lead acid cell?

A

2.1 volts

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32
Q

How is output voltage regulated in an AC alternator?

A

Varying the strength of the AC exciter fields

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33
Q

What is electrical current?

A

Flow of electrons in a circuit

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34
Q

What is the basic unit of current flow?

A

The amp

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35
Q

What two things happen when current flows through a conductor?

A

Heat is generated and magnetic field surrounds conductor

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36
Q

To measure current through a component is an ammeter placed in parallel or in series with the component?

A

Series

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37
Q

What is meant by resistance in an electrical circuit?

A

Opposition to flow of electrons

38
Q

What is the basic unit of electrical resistance?

A

The ohm

39
Q

What four things affect the resistance of an electrical conductor?

A

Material, cross section area, length and temperature

40
Q

How can you tell the resistance of a composition resistor?

A

Colored band

41
Q

What is meant by impedance?

A

Total opposition to flow of alternating current

42
Q

In what units is impedance measured?

A

Ohms

43
Q

What is the relationship between mechanical and electrical power?

A

1 horsepower = 746 watts

44
Q

What units is true power expressed?

A

Watts

45
Q

In what units is apparent power expressed?

A

Volt-amps

46
Q

What is meant by the capacity rating of a lead acid battery?

A

Number of hours a battery can supply a given current flow

47
Q

What electrolyte is used in a lead acid battery?

A

Sulfuric acid and water

48
Q

Does the specific gravity of the electrolyte in a lead acid battery increase of decrease as the battery becomes discharged?

A

Decreases

49
Q

What is specific gravity of a fully charged lead acid battery?

A

Between 1.275 and 1.300

50
Q

How many cells are there in a 24 volt lead acid battery?

A

12

51
Q

What is the range of temperature of the electrolyte in a lead acid battery that does not require correction when measuring its specific gravity?

A

Between 70F and 90F

52
Q

How do you treat a lead acid battery compartment to protect it from corrosion?

A

Paint with asphaltic paint or with polyurethane enamel

53
Q

What is used to neutralize spilled electrolyte from a lead acid battery?

A

Baking soda and water

54
Q

How high should the electrolyte level be in a properly serviced lead acid battery?

A

Only up to level of indicator in the cell

55
Q

What gasses are released when a lead acid battery is being charged?

A

Hydrogen and oxygen

56
Q

What is the electrolyte used in a nickel cadmium battery?

A

Potassium hydroxide and water

57
Q

Why is a hydrometer not used to measure the state of charge of a nickel cadmium battery?

A

Specific gravity does not change

58
Q

Is the electrolyte level of a nickel cadmium battery lowest when the battery is fully charged or fully discharged?

A

Fully discharged

59
Q

What is used to neutralize spilled electrolyte from a nickel cadmium battery?

A

Boric acid and water

60
Q

What three things must an electrical circuit contain?

A

Source, load and conductors

61
Q

What is the basic function of a switch?

A

Controls current flow

62
Q

What is a relay?

A

Electromechanical switch

63
Q

What are the two main types of variable resistors?

A

Rheostat and potentiometer

64
Q

What type of drawing depicts electrical components with respect to each other within a circuit?

A

Electrical Schematic

65
Q

What are three types of DC circuits with regard to the placement of the various circuit components?

A

Series, Parallel, and series parallel

66
Q

What are two general types of AC motors used in aircraft systems?

A

Induction motors and Synchronous motors

67
Q

What are two principal parts of a DC motor

A

Field assembly and armature assembly

68
Q

How many views can there be on an orthographic projection?

A

Six

69
Q

How many views are used to show the objects in an aircraft drawing?

A

Three

70
Q

What information is given in the title block of an aircraft drawing?

A

Name and address of company, name of part, scale of drawing, name of draftsman, name of engineer and the number of the part

71
Q

Where is the title block normally located on an aircraft drawing?

A

Lower right hand corner

72
Q

How can you know that the aircraft drawing you are using is the most current version of the drawing?

A

The number in the revision block

73
Q

What is a detail drawing?

A

Drawing that includes all information to fabricate the part

74
Q

What is an assembly drawing?

A

Drawing that shows all components of a part in an exploded form

75
Q

What is an installation drawing?

A

A drawing that shows location of parts and assemblies on the complete aircraft

76
Q

What type of drawing is most helpful in troubleshooting a system?

A

schematic diagram

77
Q

What is a block diagram?

A

Shows various functions of a system by a series of blocks

78
Q

How are dimensions shown on a aircraft drawing?

A

Numbers shown in the break of a dimension line

79
Q

What is the purpose of a center line on an aircraft drawing?

A

Divides a part into halves

80
Q

What is the purpose of a sketch of a repair?

A

Shows specific information and includes minimum amount of detail needed to create the part

81
Q

Where would an aviation mechanic find aircraft electrical schematics?

A

Maintenance manual or Wiring diagram

82
Q

What is a fuselage station number?

A

Distance in inches from datum

83
Q

What is a butt line?

A

Reference line to the right or left of the center line of aircraft

84
Q

What is meant by tare weight?

A

Weight of any chocks and other items that are used on scales

85
Q

What is included in the empty weight of an aircraft?

A

Weight of airframe, engines and all items of operating equipment that are permanently installed

86
Q

What equipment must be installed in an aircraft when it is weighed to find its empty weight center of gravity?

A

All equipment listed in the Aircraft Equipment list as required equipment or as equipment that is permanently installed

87
Q

What is meant by permanent ballast for an aircraft?

A

Weight that is permanently installed in an aircraft

88
Q

What is meant by the maximum zero fuel weight of an aircraft?

A

The maximum permissible weight of a loaded aircraft

89
Q

What is meant by undrainable fuel?

A

Fuel left in tank after it is drained

90
Q
A

Oral (2 decks)

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