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Aircraft Electrica Current (2)

Aircraft Electrica Current (2)
30問 • 1年前
  • Lenard Espiritu
    • 通報

    問題一覧

  • 1

    (1) There are three basic types of dc motors; series, shunt, and compound. (2) In the series motor, the field windings, consisting of relatively few turns of heavy wire, are connected in series with the armature winding. Regarding the above statements,

    Both No. 1 and No. 2 are true

  • 2

    If the positive field lead between a generator and a generator control panel breaks and is shorted while the engine is running, a voltmeter connected to generator output would indicate

    Residual voltage

  • 3

    The overvoltage control automatically protects the generator system when excessive voltage is present by

    Opening the shunt field circuit.

  • 4

    Residual voltage is a result of magnetism in the

    Field shoes

  • 5

    The major advantages of alternating current (AC) over direct current (DC) is the fact that its current and voltage can easily be increased or decreased

    By means of a transformer.

  • 6

    When using the voltage drop method of checking circuit resistance, the

    Input voltage must be maintained at a constant value.

  • 7

    The only practical method of maintaining a constant voltage output from an aircraft generator under varying conditions of speed and load is to vary the

    Strength of the magnetic field

  • 8

    Which of the following factors must be taken into consideration when determining the wire size to use for an aircraft installation? 1. Mechanical strength. 2. Allowable power loss. 3. Ease of installation. 4. Resistance of current return path through the aircraft structure. 5. Permissible voltage drop. 6. Current carrying capability of the conductor. 7. Type of load (continuous or intermittent).

    2, 5, 6, 7

  • 9

    What is the voltage drop for a No. 18 copper wire 50 feet long to carry 12.5 amperes continuous operation? Use the formula VD = RLA VD = Voltage drop R = Resistance per ft = 00644 L = Length of wire A = Amperes

    4V

  • 10

    Electric circuits are protected from overheating by

    Fuses

  • 11

    How is a shunt-wound de generator connected?

    Both fields are shunted across the armature.

  • 12

    The method most often used in overcoming the effect of armature reaction is through the use of

    Interpoles

  • 13

    If the (+) terminal of a voltmeter is connected to the (-) terminal of the source voltage and the (-) terminal of the meter is connected to the (+) terminal of the source voltage, the voltmeter will read

    Backwards

  • 14

    The inductor-type inverter output voltage is controlled by the

    DC stator field current

  • 15

    Which of the following are the major parts of a dc motor? 1. Armature assembly 2. Field assembly 3. Brush assembly 4. Commutator 5. Pole piece 6. Rheostat 7. End frame

    1, 2,8,7

  • 16

    If one switch is used to control all navigation lights, the lights are most likely connected

    Parallel to each other and in series with the switch.

  • 17

    help minimize radio interference, a capacitor will largely eliminate and provide a steady direct current if the capacitor is connected to the generator in

    Parallel

  • 18

    A certain switch is described as a single-pole, double-throw switch (SPDT). The throw of a switch indicates the number of

    Circuits each pole can complete through the switch.

  • 19

    The starting current of a series-wound de motor, in passing through both the field and armature windings, produces a

    High starting torque

  • 20

    What type of instrument is used for measuring very high values of resistance?

    Megohmmeter

  • 21

    In an AC circuit with no phase lead or lag, which is true?

    Real power equals apparent power.

  • 22

    When selecting hardware for attaching bonding connections to an aircraft structure, which of the following should be considered? 1. Mechanical strength. 2. Allowable power loss. 3. Ease of installation. 4. Permissible voltage drop. 5. Amount of current to be carried. 6. Type of load (continuous or intermittent).

    1, 3, 5

  • 23

    Aircraft fuse capacity is rated in

    Amperes

  • 24

    The voltage output of an alternator may be regulated by controlling the

    Voltage output of the dc exciter

  • 25

    Which of the following should be accomplished in the installation of aircraft wiring? 泅

    Locate the bundle above flammable fluid lines and securely clamp to structure.

  • 26

    An aircraft electrical circuit control relay is

    An electronically operated switch.

  • 27

    A battery-generator system provides direct current. On installations requiring alternating current from the battery-generator system, it is necessary to have

    An inverter.

  • 28

    What is the purpose of the selection of derated switches for known continuous load current applications?

    To obtain reasonable switch efficiency and service life.

  • 29

    Certain transport aircraft use ac electrical power for all normal operation and battery furnished de electrical power for standby emergency use. In aircraft of this type that operates no de generators, the batteries are kept charged by

    Rectifiers which use the aircraft's ac

  • 30

    Aluminum wire must be stripped very carefully because

    Individual strands will break easily after being nicked

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    問題一覧

  • 1

    (1) There are three basic types of dc motors; series, shunt, and compound. (2) In the series motor, the field windings, consisting of relatively few turns of heavy wire, are connected in series with the armature winding. Regarding the above statements,

    Both No. 1 and No. 2 are true

  • 2

    If the positive field lead between a generator and a generator control panel breaks and is shorted while the engine is running, a voltmeter connected to generator output would indicate

    Residual voltage

  • 3

    The overvoltage control automatically protects the generator system when excessive voltage is present by

    Opening the shunt field circuit.

  • 4

    Residual voltage is a result of magnetism in the

    Field shoes

  • 5

    The major advantages of alternating current (AC) over direct current (DC) is the fact that its current and voltage can easily be increased or decreased

    By means of a transformer.

  • 6

    When using the voltage drop method of checking circuit resistance, the

    Input voltage must be maintained at a constant value.

  • 7

    The only practical method of maintaining a constant voltage output from an aircraft generator under varying conditions of speed and load is to vary the

    Strength of the magnetic field

  • 8

    Which of the following factors must be taken into consideration when determining the wire size to use for an aircraft installation? 1. Mechanical strength. 2. Allowable power loss. 3. Ease of installation. 4. Resistance of current return path through the aircraft structure. 5. Permissible voltage drop. 6. Current carrying capability of the conductor. 7. Type of load (continuous or intermittent).

    2, 5, 6, 7

  • 9

    What is the voltage drop for a No. 18 copper wire 50 feet long to carry 12.5 amperes continuous operation? Use the formula VD = RLA VD = Voltage drop R = Resistance per ft = 00644 L = Length of wire A = Amperes

    4V

  • 10

    Electric circuits are protected from overheating by

    Fuses

  • 11

    How is a shunt-wound de generator connected?

    Both fields are shunted across the armature.

  • 12

    The method most often used in overcoming the effect of armature reaction is through the use of

    Interpoles

  • 13

    If the (+) terminal of a voltmeter is connected to the (-) terminal of the source voltage and the (-) terminal of the meter is connected to the (+) terminal of the source voltage, the voltmeter will read

    Backwards

  • 14

    The inductor-type inverter output voltage is controlled by the

    DC stator field current

  • 15

    Which of the following are the major parts of a dc motor? 1. Armature assembly 2. Field assembly 3. Brush assembly 4. Commutator 5. Pole piece 6. Rheostat 7. End frame

    1, 2,8,7

  • 16

    If one switch is used to control all navigation lights, the lights are most likely connected

    Parallel to each other and in series with the switch.

  • 17

    help minimize radio interference, a capacitor will largely eliminate and provide a steady direct current if the capacitor is connected to the generator in

    Parallel

  • 18

    A certain switch is described as a single-pole, double-throw switch (SPDT). The throw of a switch indicates the number of

    Circuits each pole can complete through the switch.

  • 19

    The starting current of a series-wound de motor, in passing through both the field and armature windings, produces a

    High starting torque

  • 20

    What type of instrument is used for measuring very high values of resistance?

    Megohmmeter

  • 21

    In an AC circuit with no phase lead or lag, which is true?

    Real power equals apparent power.

  • 22

    When selecting hardware for attaching bonding connections to an aircraft structure, which of the following should be considered? 1. Mechanical strength. 2. Allowable power loss. 3. Ease of installation. 4. Permissible voltage drop. 5. Amount of current to be carried. 6. Type of load (continuous or intermittent).

    1, 3, 5

  • 23

    Aircraft fuse capacity is rated in

    Amperes

  • 24

    The voltage output of an alternator may be regulated by controlling the

    Voltage output of the dc exciter

  • 25

    Which of the following should be accomplished in the installation of aircraft wiring? 泅

    Locate the bundle above flammable fluid lines and securely clamp to structure.

  • 26

    An aircraft electrical circuit control relay is

    An electronically operated switch.

  • 27

    A battery-generator system provides direct current. On installations requiring alternating current from the battery-generator system, it is necessary to have

    An inverter.

  • 28

    What is the purpose of the selection of derated switches for known continuous load current applications?

    To obtain reasonable switch efficiency and service life.

  • 29

    Certain transport aircraft use ac electrical power for all normal operation and battery furnished de electrical power for standby emergency use. In aircraft of this type that operates no de generators, the batteries are kept charged by

    Rectifiers which use the aircraft's ac

  • 30

    Aluminum wire must be stripped very carefully because

    Individual strands will break easily after being nicked