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26問 • 1年前
  • Guevara Official
    • 通報

    問題一覧

  • 1

    On an aircraft DC generator the pole pieces are :

    electromagnets

  • 2

    the most common type used at the A/C

    is Shunt wound

  • 3

    The coil ends connected to adjacent commutator segment :

    Lap winding

  • 4

    The speed of a series motor is dependent

    upon the load.

  • 5

    If the heavy mechanical load is removed from a series motor the speed will:

    increased and the armature current will decrease.

  • 6

    If a DC shunt motor lost its residual magnetism it would :

    run normally

  • 7

    Additional generator poles in a DC motors are provided

    to Compensation for the armature reaction

  • 8

    The current consumed is decreased as the

    rotation speed increased while starting in the DC motor.

  • 9

    Armature reaction is when:

    field excited, armature excited.

  • 10

    To decrease the arcing at the brushes in a high output generators we

    add interpoles and compensating winding

  • 11

    In the series motor, the field windings, consisting of a relatively :

    few turns of heavy wire

  • 12

    Number of cycle completed per second :

    frequency

  • 13

    Alternating polarity from an alternator takes on a distinct shape, known

    as a sine wave.

  • 14

    Root mean square:

    is the equivalent DC heating effect

  • 15

    The peak value of an aircraft 115v single phase is :

    162.6

  • 16

    A sine wave of RMS value 7.06 volts has a peak to peak value of.

    20 volt

  • 17

    Peak value=

    RMS/0.707

  • 18

    The form factor of an AC waveform can be found by :

    RMS value divided by the average value

  • 19

    Square-shaped waveforms always have crest and form factors equal to 1, since

    the peak is the same as the RMS and average values

  • 20

    Three phase

    star connection(Y)

  • 21

    Split phase means:

    single phase

  • 22

    Line voltage with a delta type connection will be the same as

    phase voltage.

  • 23

    The max. Value of voltage in either (+ve) or (– ve) direction is.

    The peak value

  • 24

    The AC waveform has mark-to-space ratio 0.5 this means :

    the space is twice the mark

  • 25

    constant direction :

    direct current

  • 26

    The Form Factor of an AC waveform can be found by.

    RMS value divided by the average value

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    問題一覧

  • 1

    On an aircraft DC generator the pole pieces are :

    electromagnets

  • 2

    the most common type used at the A/C

    is Shunt wound

  • 3

    The coil ends connected to adjacent commutator segment :

    Lap winding

  • 4

    The speed of a series motor is dependent

    upon the load.

  • 5

    If the heavy mechanical load is removed from a series motor the speed will:

    increased and the armature current will decrease.

  • 6

    If a DC shunt motor lost its residual magnetism it would :

    run normally

  • 7

    Additional generator poles in a DC motors are provided

    to Compensation for the armature reaction

  • 8

    The current consumed is decreased as the

    rotation speed increased while starting in the DC motor.

  • 9

    Armature reaction is when:

    field excited, armature excited.

  • 10

    To decrease the arcing at the brushes in a high output generators we

    add interpoles and compensating winding

  • 11

    In the series motor, the field windings, consisting of a relatively :

    few turns of heavy wire

  • 12

    Number of cycle completed per second :

    frequency

  • 13

    Alternating polarity from an alternator takes on a distinct shape, known

    as a sine wave.

  • 14

    Root mean square:

    is the equivalent DC heating effect

  • 15

    The peak value of an aircraft 115v single phase is :

    162.6

  • 16

    A sine wave of RMS value 7.06 volts has a peak to peak value of.

    20 volt

  • 17

    Peak value=

    RMS/0.707

  • 18

    The form factor of an AC waveform can be found by :

    RMS value divided by the average value

  • 19

    Square-shaped waveforms always have crest and form factors equal to 1, since

    the peak is the same as the RMS and average values

  • 20

    Three phase

    star connection(Y)

  • 21

    Split phase means:

    single phase

  • 22

    Line voltage with a delta type connection will be the same as

    phase voltage.

  • 23

    The max. Value of voltage in either (+ve) or (– ve) direction is.

    The peak value

  • 24

    The AC waveform has mark-to-space ratio 0.5 this means :

    the space is twice the mark

  • 25

    constant direction :

    direct current

  • 26

    The Form Factor of an AC waveform can be found by.

    RMS value divided by the average value