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Aircraft Electric Current

Aircraft Electric Current
100問 • 1年前
  • Lenard Espiritu
    • 通報

    問題一覧

  • 1

    A circuit breaker is installed in an aircraft electrical system primarily to protect the

    Circuit and should be located as close to the sources possible.

  • 2

    What is the frequency of an alternator dependent upon?

    RPM

  • 3

    The most common method of attaching a pin or socket to an individual wire in an MS electrical connector is by

    Crimping

  • 4

    The voltage in an ac transformer secondary that contains twice as many loops as the primary will be

    Greater and the amperage less than in the primary.

  • 5

    Aircraft which operate only ac generators (alternators) as a primary source of electrical power normally provide current suitable for battery charging through the use of

    A stepdown transformer and a rectifier.

  • 6

    Aircraft electrical junction boxes located in a fire zone are usually constructed of

    Stainless steel

  • 7

    What is a method used for restoring generator field residual magnetism?

    Flash the fields.

  • 8

    Electrical connectors used in the aircraft assemblies should meet which of the following specifications?

    Military Specifications (MS)

  • 9

    In troubleshooting an electrical circuit, if an ohmmeter is properly connected across a circuit component and some value of resistance is read,

    The component has continuity and is not open.

  • 10

    Which of the following must be accomplished when installing an anti-collision light?

    Install a switch independent of the position light switch.

  • 11

    What protection to wires and cables does conduit provide when used in aircraft installations?

    Mechanical

  • 12

    What is the minimum bend radius for an electrical wire bundle?

    Ten times the outside diameter of the bundle.

  • 13

    What is required when operating two aircraft ac generators in parallel?

    Frequency and voltage must both be equal.

  • 14

    CSD driven generators are usually cooled by

    Oil spray

  • 15

    What is the color and orientation of the position lights for navigation on civil airplanes?

    Left side - red, right side - green, rear aft - white.

  • 16

    Which of the following are considered circuit-protective devices that are used in aircraft electrical systems?

    Circuit breakers, fuses, and current limiters.

  • 17

    What is the principal advantage of the series-wound de motor?

    High starting torque

  • 18

    How can it be determined if a transformer winding has some of its turns shorted together?

    The transformer will get hot in normal operation.

  • 19

    In the American Wire Gauge (AWG) system of numbers used to designate electrical wire sizes, the number assigned to a size is related to its

    Cross-sectional area

  • 20

    The circuit breaker in the instrument lighting system protects the

    Wiring from too much current.

  • 21

    During ground operation, aircraft generator cooling is usually accomplished by

    An integral fan.

  • 22

    When de generators are operated in parallel to supply power for a single load, their controls include an equalizer circuit to assure that all generators share the load equally. The equalizer circuit operates by

    Increasing the output of the low generator and decreasing the output of the high generator until they are equal.

  • 23

    Oil canning of the sides of aluminum or steel electrical junction boxes is considered to be

    A shorting hazard

  • 24

    Which of the following is not one of the purposes of interpoles in a generator?

    Reduce field strength.

  • 25

    What is an important factor in selecting aircraft fuses?

    Capacity matches the needs of the circuit.

  • 26

    The strength of the core of an electromagnet depends upon the material from which it is constructed and which of the following?

    The number of turns of wire in the coil and the amount of current (amperes) passing through the coil.

  • 27

    A CSD unit drives a generator through the use of

    A variable hydraulic pump and hydraulic motor.

  • 28

    One purpose of a growler test is to determine the presence of

    A shorted armature

  • 29

    In aircraft electrical systems, automatic reset circuit breakers

    Should not be used as circuit protective devices.

  • 30

    If a generator is equipped with a vibrator-type voltage regulator, the actual time the voltage regulator points remain open

    Depends on the load carried by the generator.

  • 31

    The pole pieces or shoes used in a de generator are a part of the

    Field assembly

  • 32

    A CSD unit that is disconnected in flight, due to a malfunction such as over-temperature, may be reconnected

    Only on the ground by maintenance personnel.

  • 33

    When adding a rheostat to a light circuit to control the light intensity, it should be connected in

    Series with the light.

  • 34

    Circuits that must be operated only in an emergency or whose inadvertent activation could endanger a system frequently employ

    Guarded switches

  • 35

    Why are the iron cores of most induction coils laminated?

    To reduce the effects of eddy currents.

  • 36

    If the Integrated Drive Generator (IDG) scavenge oil filter is contaminated with metal, you should

    Remove and replace the IDG.

  • 37

    During an inspection of the terminal strips of an aircraft electrical system, it should be determined that

    The terminal studs are anchored against rotation.

  • 38

    Grounding is electrically connecting a conductive object to the primary structure. One purpose of grounding is to

    Prevent the development of radio frequency potentials.

  • 39

    The primary considerations when selecting electric cable size are

    Current-carrying capacity and allowable voltage drop.

  • 40

    How should the splices be arranged if several are to be located in an electrical wire bundle?

    Staggered along the length of the bundle.

  • 41

    Some electric motors have two sets of field windings wound in opposite directions so that the

    Motor can be operated in either direction.

  • 42

    The most common method of regulating the voltage output of a compound de generator is to vary the

    Current flowing through the shunt field coils.

  • 43

    The type of electric wire terminals used for most aircraft applications, in addition to providing good current carrying capabilities, are designed primarily

    To prevent circuit failure due to terminal disconnection.

  • 44

    What is the cause of generator brush arcing?

    Low spring tension

  • 45

    What does a rectifier do?

    Changes alternating current into direct current.

  • 46

    To test generator or motor armature windings for opens,

    Place armature in a growler and connect a 110V test light on adjacent segments; the light should light.

  • 47

    Electric wire terminals for most aircraft applications must be what type?

    Ring

  • 48

    Which type of de generator is not used as an airplane generator?

    Series wound

  • 49

    Which of the following copper electrical cable sizes should be selected to replace a No. 6 aluminum electrical cable?

    No.6

  • 50

    A voltage regulator controls generator voltage by changing the

    Resistance of the generator field circuit.

  • 51

    A voltage regulator controls generator output by

    Varying current flow to generator field coil.

  • 52

    What should be used to protect wires from chafing when they must pass through bulkheads, firewalls, ribs, etc.?

    Suitable grommet

  • 53

    When a diode is checked for an open circuit or a short circuit, it should be

    Disconnected from the circuit.

  • 54

    If any one generator in a 24-volt de system shows low voltage, the most likely cause is

    An out-of-adjustment voltage regulator

  • 55

    What is the advantage of a circuit breaker when compared to a fuse?

    It is resettable and reusable.

  • 56

    One advantage of using ac electrical power in aircraft is

    greater ease in stepping the voltage up or down.

  • 57

    Which motor would be most likely to have an armature brake?

    Landing light retraction motor

  • 58

    The pin section of an AN/MS connector is normally installed on

    The ground side of a circuit.

  • 59

    The nominal rating of electrical switches refers to continuous

    Current rating with the contacts closed.

  • 60

    What is the ratio of turns between the primary coil winding and the secondary coil winding of a transformer designed to triple its input voltage?

    Primary will have one-third as many turns as its secondary.

  • 61

    An ammeter in a battery charging system is for the purpose of indicating the

    Rate of current used to charge the battery.

  • 62

    How can the direction of rotation of a de electric motor be changed?

    Reverse the electrical connections to either the field or armature windings.

  • 63

    During an inspection of an anti-collision light installation for condition and proper operation, it should be determined that

    Electrical or mechanical interconnections are provided so that the anti-collision light will operate at all times that the position light switch is in the ON position.

  • 64

    When necessary during operation, CSD disconnect is usually accomplished by

    A switch in the cockpit.

  • 65

    The commutator of a generator

    Changes alternating current produced in the armature into the direct current as it is taken from the armature.

  • 66

    If it is necessary to use an electrical connector where it may be exposed to moisture, the mechanic should

    Use a special moisture-proof type.

  • 67

    Which statement relating to electric wiring is true?

    When attaching a terminal to the end of an electric cable, it should be determined that the strength of the cable-to-terminal joint is at least equal O to the tensile strength of the cable itself.

  • 68

    Integrated drive generators (IDG) employ a type of high output ac generator that utilizes

    A brushless system to produce current.

  • 69

    Which of the following is most likely to cause thermal runaway in a nickel-cadmium battery?

    Excessive current draw from the battery.

  • 70

    The navigation lights of some aircraft consist of a single circuit controlled by a single switch which has an ON position and an OFF position, with no additional positions possible. This switch is referred to as a

    Single-pole, single-throw (SPST), two-position switch

  • 71

    To what depth is the mica insulation between the commutator bars of a de generator undercut?

    Equal to the width of the mica.

  • 72

    Bonding connections should be tested for

    Resistance value

  • 73

    How many cycles of ac voltage are produced in a six-pole alternator of the revolving-field type for each revolution of the rotor?

    Three

  • 74

    Electric wiring installed in aircraft without special enclosing means (open wiring) offers the advantages of ease of installation, simple maintenance, and reduced weight. When bundling open wiring, the bundles should

    Be limited as to the number of cables to minimize damage from a single electrical fault.

  • 75

    How should a coaxial cable be routed?

    As directiy as possible.

  • 76

    How does the magnetic brake used to stop the rotation of an electric motor armature operate?

    A friction brake is applied by a spring and released by a magnet.

  • 77

    The poles of a generator are laminated to

    Reduce eddy current losses

  • 78

    When approved, splices may be used to repair manufactured harnesses or installed wiring. The maximum number of splices permitted between any two connectors is

    One

  • 79

    What is the advantage of a current limiter?

    It will take overload for a short period.

  • 80

    What is the appropriate method for installing pre-insulated terminal lugs and splices to electric wires?

    Using a crimping tool to secure the terminal lug

  • 81

    If several long lengths of electrical cable are to be installed in rigid conduit, the possibility of damage to the cable as it is pulled through the conduit will be reduced by

    Dusting the cable with powdered soapstone.

  • 82

    How should a voltmeter be connected?

    In parallel with the load.

  • 83

    How are generators rated?

    Amperes at rated voltage.

  • 84

    If a wire is installed so that it comes in contact with some moving parts, what protection should be given to the wire?

    Pass through conduit.

  • 85

    What is the maximum amount of time a circuit can be in operation and still be an intermittent duty circuit?

    Two minutes

  • 86

    Where is the generator rating and performance data located?

    Stamped on the generator data plate

  • 87

    The purpose of a rectifier in an electrical system is to change

    Alternating current to direct current.

  • 88

    When handling a high voltage capacitor in an electrical circuit, be sure it

    Is fully discharged before removing it from the circuit.

  • 89

    Static inverters are electronic devices that change DC to AC with the

    Use of an oscillator.

  • 90

    What kind of switch should you install in a single wire circuit that requires the switch to be manually held in the ON position?

    Single-pole, single-throw (SPST), two-position normally open (NO).

  • 91

    If the reverse current cutout relay contact points fail to open after the generator output has dropped below battery potential, current will flow through the generator armature

    Opposite the normal direction and through the shunt field in the normal direction.

  • 92

    When using an ohmmeter to check the continuity of a generator field coil, the coil should

    Show very low resistance if it is a series field coil.

  • 93

    When considering an alteration, the criteria upon which the selection of electric cable size should be based are

    Current-carrying capacity and allowable voltage drop.

  • 94

    Major adjustments on equipment such as regulators, contractors, and inverters are best accomplished outside the airplane on test benches with necessary instruments and equipment. Adjustment procedure should be as outlined by:

    The equipment manufacturer.

  • 95

    In a generator, what eliminates any possible sparking to the brush guides caused by the movement of the brushes within the holder?

    The brush pigtail.

  • 96

    In installations where the ammeter is in the generator or alternator lead, and the regulator system does not limit the maximum current that the generator or alternator can deliver, the ammeter can be redlined at what percent of the generator or alternator rating?

    100

  • 97

    What is the most accurate type of frequency-measuring instrument?

    Integrated circuit chip having a clock circuit.

  • 98

    A series-wound de electric motor will normally require

    More current at low RPM than at high RPM.

  • 99

    What is normally used to bond noncontiguous stainless steel aircraft components?

    Copper jumpers

  • 100

    A circuit protection device called a current limiter is essentially a slow-blow fuse and is designed to be used in

    Heavy power circuits

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    問題一覧

  • 1

    A circuit breaker is installed in an aircraft electrical system primarily to protect the

    Circuit and should be located as close to the sources possible.

  • 2

    What is the frequency of an alternator dependent upon?

    RPM

  • 3

    The most common method of attaching a pin or socket to an individual wire in an MS electrical connector is by

    Crimping

  • 4

    The voltage in an ac transformer secondary that contains twice as many loops as the primary will be

    Greater and the amperage less than in the primary.

  • 5

    Aircraft which operate only ac generators (alternators) as a primary source of electrical power normally provide current suitable for battery charging through the use of

    A stepdown transformer and a rectifier.

  • 6

    Aircraft electrical junction boxes located in a fire zone are usually constructed of

    Stainless steel

  • 7

    What is a method used for restoring generator field residual magnetism?

    Flash the fields.

  • 8

    Electrical connectors used in the aircraft assemblies should meet which of the following specifications?

    Military Specifications (MS)

  • 9

    In troubleshooting an electrical circuit, if an ohmmeter is properly connected across a circuit component and some value of resistance is read,

    The component has continuity and is not open.

  • 10

    Which of the following must be accomplished when installing an anti-collision light?

    Install a switch independent of the position light switch.

  • 11

    What protection to wires and cables does conduit provide when used in aircraft installations?

    Mechanical

  • 12

    What is the minimum bend radius for an electrical wire bundle?

    Ten times the outside diameter of the bundle.

  • 13

    What is required when operating two aircraft ac generators in parallel?

    Frequency and voltage must both be equal.

  • 14

    CSD driven generators are usually cooled by

    Oil spray

  • 15

    What is the color and orientation of the position lights for navigation on civil airplanes?

    Left side - red, right side - green, rear aft - white.

  • 16

    Which of the following are considered circuit-protective devices that are used in aircraft electrical systems?

    Circuit breakers, fuses, and current limiters.

  • 17

    What is the principal advantage of the series-wound de motor?

    High starting torque

  • 18

    How can it be determined if a transformer winding has some of its turns shorted together?

    The transformer will get hot in normal operation.

  • 19

    In the American Wire Gauge (AWG) system of numbers used to designate electrical wire sizes, the number assigned to a size is related to its

    Cross-sectional area

  • 20

    The circuit breaker in the instrument lighting system protects the

    Wiring from too much current.

  • 21

    During ground operation, aircraft generator cooling is usually accomplished by

    An integral fan.

  • 22

    When de generators are operated in parallel to supply power for a single load, their controls include an equalizer circuit to assure that all generators share the load equally. The equalizer circuit operates by

    Increasing the output of the low generator and decreasing the output of the high generator until they are equal.

  • 23

    Oil canning of the sides of aluminum or steel electrical junction boxes is considered to be

    A shorting hazard

  • 24

    Which of the following is not one of the purposes of interpoles in a generator?

    Reduce field strength.

  • 25

    What is an important factor in selecting aircraft fuses?

    Capacity matches the needs of the circuit.

  • 26

    The strength of the core of an electromagnet depends upon the material from which it is constructed and which of the following?

    The number of turns of wire in the coil and the amount of current (amperes) passing through the coil.

  • 27

    A CSD unit drives a generator through the use of

    A variable hydraulic pump and hydraulic motor.

  • 28

    One purpose of a growler test is to determine the presence of

    A shorted armature

  • 29

    In aircraft electrical systems, automatic reset circuit breakers

    Should not be used as circuit protective devices.

  • 30

    If a generator is equipped with a vibrator-type voltage regulator, the actual time the voltage regulator points remain open

    Depends on the load carried by the generator.

  • 31

    The pole pieces or shoes used in a de generator are a part of the

    Field assembly

  • 32

    A CSD unit that is disconnected in flight, due to a malfunction such as over-temperature, may be reconnected

    Only on the ground by maintenance personnel.

  • 33

    When adding a rheostat to a light circuit to control the light intensity, it should be connected in

    Series with the light.

  • 34

    Circuits that must be operated only in an emergency or whose inadvertent activation could endanger a system frequently employ

    Guarded switches

  • 35

    Why are the iron cores of most induction coils laminated?

    To reduce the effects of eddy currents.

  • 36

    If the Integrated Drive Generator (IDG) scavenge oil filter is contaminated with metal, you should

    Remove and replace the IDG.

  • 37

    During an inspection of the terminal strips of an aircraft electrical system, it should be determined that

    The terminal studs are anchored against rotation.

  • 38

    Grounding is electrically connecting a conductive object to the primary structure. One purpose of grounding is to

    Prevent the development of radio frequency potentials.

  • 39

    The primary considerations when selecting electric cable size are

    Current-carrying capacity and allowable voltage drop.

  • 40

    How should the splices be arranged if several are to be located in an electrical wire bundle?

    Staggered along the length of the bundle.

  • 41

    Some electric motors have two sets of field windings wound in opposite directions so that the

    Motor can be operated in either direction.

  • 42

    The most common method of regulating the voltage output of a compound de generator is to vary the

    Current flowing through the shunt field coils.

  • 43

    The type of electric wire terminals used for most aircraft applications, in addition to providing good current carrying capabilities, are designed primarily

    To prevent circuit failure due to terminal disconnection.

  • 44

    What is the cause of generator brush arcing?

    Low spring tension

  • 45

    What does a rectifier do?

    Changes alternating current into direct current.

  • 46

    To test generator or motor armature windings for opens,

    Place armature in a growler and connect a 110V test light on adjacent segments; the light should light.

  • 47

    Electric wire terminals for most aircraft applications must be what type?

    Ring

  • 48

    Which type of de generator is not used as an airplane generator?

    Series wound

  • 49

    Which of the following copper electrical cable sizes should be selected to replace a No. 6 aluminum electrical cable?

    No.6

  • 50

    A voltage regulator controls generator voltage by changing the

    Resistance of the generator field circuit.

  • 51

    A voltage regulator controls generator output by

    Varying current flow to generator field coil.

  • 52

    What should be used to protect wires from chafing when they must pass through bulkheads, firewalls, ribs, etc.?

    Suitable grommet

  • 53

    When a diode is checked for an open circuit or a short circuit, it should be

    Disconnected from the circuit.

  • 54

    If any one generator in a 24-volt de system shows low voltage, the most likely cause is

    An out-of-adjustment voltage regulator

  • 55

    What is the advantage of a circuit breaker when compared to a fuse?

    It is resettable and reusable.

  • 56

    One advantage of using ac electrical power in aircraft is

    greater ease in stepping the voltage up or down.

  • 57

    Which motor would be most likely to have an armature brake?

    Landing light retraction motor

  • 58

    The pin section of an AN/MS connector is normally installed on

    The ground side of a circuit.

  • 59

    The nominal rating of electrical switches refers to continuous

    Current rating with the contacts closed.

  • 60

    What is the ratio of turns between the primary coil winding and the secondary coil winding of a transformer designed to triple its input voltage?

    Primary will have one-third as many turns as its secondary.

  • 61

    An ammeter in a battery charging system is for the purpose of indicating the

    Rate of current used to charge the battery.

  • 62

    How can the direction of rotation of a de electric motor be changed?

    Reverse the electrical connections to either the field or armature windings.

  • 63

    During an inspection of an anti-collision light installation for condition and proper operation, it should be determined that

    Electrical or mechanical interconnections are provided so that the anti-collision light will operate at all times that the position light switch is in the ON position.

  • 64

    When necessary during operation, CSD disconnect is usually accomplished by

    A switch in the cockpit.

  • 65

    The commutator of a generator

    Changes alternating current produced in the armature into the direct current as it is taken from the armature.

  • 66

    If it is necessary to use an electrical connector where it may be exposed to moisture, the mechanic should

    Use a special moisture-proof type.

  • 67

    Which statement relating to electric wiring is true?

    When attaching a terminal to the end of an electric cable, it should be determined that the strength of the cable-to-terminal joint is at least equal O to the tensile strength of the cable itself.

  • 68

    Integrated drive generators (IDG) employ a type of high output ac generator that utilizes

    A brushless system to produce current.

  • 69

    Which of the following is most likely to cause thermal runaway in a nickel-cadmium battery?

    Excessive current draw from the battery.

  • 70

    The navigation lights of some aircraft consist of a single circuit controlled by a single switch which has an ON position and an OFF position, with no additional positions possible. This switch is referred to as a

    Single-pole, single-throw (SPST), two-position switch

  • 71

    To what depth is the mica insulation between the commutator bars of a de generator undercut?

    Equal to the width of the mica.

  • 72

    Bonding connections should be tested for

    Resistance value

  • 73

    How many cycles of ac voltage are produced in a six-pole alternator of the revolving-field type for each revolution of the rotor?

    Three

  • 74

    Electric wiring installed in aircraft without special enclosing means (open wiring) offers the advantages of ease of installation, simple maintenance, and reduced weight. When bundling open wiring, the bundles should

    Be limited as to the number of cables to minimize damage from a single electrical fault.

  • 75

    How should a coaxial cable be routed?

    As directiy as possible.

  • 76

    How does the magnetic brake used to stop the rotation of an electric motor armature operate?

    A friction brake is applied by a spring and released by a magnet.

  • 77

    The poles of a generator are laminated to

    Reduce eddy current losses

  • 78

    When approved, splices may be used to repair manufactured harnesses or installed wiring. The maximum number of splices permitted between any two connectors is

    One

  • 79

    What is the advantage of a current limiter?

    It will take overload for a short period.

  • 80

    What is the appropriate method for installing pre-insulated terminal lugs and splices to electric wires?

    Using a crimping tool to secure the terminal lug

  • 81

    If several long lengths of electrical cable are to be installed in rigid conduit, the possibility of damage to the cable as it is pulled through the conduit will be reduced by

    Dusting the cable with powdered soapstone.

  • 82

    How should a voltmeter be connected?

    In parallel with the load.

  • 83

    How are generators rated?

    Amperes at rated voltage.

  • 84

    If a wire is installed so that it comes in contact with some moving parts, what protection should be given to the wire?

    Pass through conduit.

  • 85

    What is the maximum amount of time a circuit can be in operation and still be an intermittent duty circuit?

    Two minutes

  • 86

    Where is the generator rating and performance data located?

    Stamped on the generator data plate

  • 87

    The purpose of a rectifier in an electrical system is to change

    Alternating current to direct current.

  • 88

    When handling a high voltage capacitor in an electrical circuit, be sure it

    Is fully discharged before removing it from the circuit.

  • 89

    Static inverters are electronic devices that change DC to AC with the

    Use of an oscillator.

  • 90

    What kind of switch should you install in a single wire circuit that requires the switch to be manually held in the ON position?

    Single-pole, single-throw (SPST), two-position normally open (NO).

  • 91

    If the reverse current cutout relay contact points fail to open after the generator output has dropped below battery potential, current will flow through the generator armature

    Opposite the normal direction and through the shunt field in the normal direction.

  • 92

    When using an ohmmeter to check the continuity of a generator field coil, the coil should

    Show very low resistance if it is a series field coil.

  • 93

    When considering an alteration, the criteria upon which the selection of electric cable size should be based are

    Current-carrying capacity and allowable voltage drop.

  • 94

    Major adjustments on equipment such as regulators, contractors, and inverters are best accomplished outside the airplane on test benches with necessary instruments and equipment. Adjustment procedure should be as outlined by:

    The equipment manufacturer.

  • 95

    In a generator, what eliminates any possible sparking to the brush guides caused by the movement of the brushes within the holder?

    The brush pigtail.

  • 96

    In installations where the ammeter is in the generator or alternator lead, and the regulator system does not limit the maximum current that the generator or alternator can deliver, the ammeter can be redlined at what percent of the generator or alternator rating?

    100

  • 97

    What is the most accurate type of frequency-measuring instrument?

    Integrated circuit chip having a clock circuit.

  • 98

    A series-wound de electric motor will normally require

    More current at low RPM than at high RPM.

  • 99

    What is normally used to bond noncontiguous stainless steel aircraft components?

    Copper jumpers

  • 100

    A circuit protection device called a current limiter is essentially a slow-blow fuse and is designed to be used in

    Heavy power circuits