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3.15

3.15
13問 • 1年前
  • Guevara Official
    • 通報

    問題一覧

  • 1

    the device that transfers electrical energy from one circuit to another by electromagnetic induction is :

    transformer

  • 2

    The purpose of the core in the transformer is:

    provides a path for the magnetic lines of flux.

  • 3

    The primary winding, which receives

    energy from the ac source.

  • 4

    The secondary winding, which

    receives energy from the primary winding and delivers it to the load.

  • 5

    secondary voltage may be either in or out of phase with the primary voltage depends on the :

    direction in which the windings are wound

  • 6

    To reduce eddy-current In a transformer you would :

    reduce the thickness of laminations in the magnetic core

  • 7

    In a transformer the core provides a

    path for the magnetic lines

  • 8

    An autotransformer has :

    1 coil

  • 9

    The current transformer are designed to be powering :

    ammeters

  • 10

    The total voltage induced into the secondary winding of a transformer is determined mainly by :

    the ratio of the number of turns in the primary to the number of turns in the secondary

  • 11

    Radio-Frequency Transformers used to couple circuits to which frequencies:

    above 20,000 Hz

  • 12

    If the input power to a transformer is 650 watts and the output power is 610 watts, what is the efficiency?

    94%

  • 13

    If a transformer of 5:1 with Vin=120V supplies a light of 24V/45A how much is the input current I=

    9A

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    13問 • 1年前
    Guevara Official

    問題一覧

  • 1

    the device that transfers electrical energy from one circuit to another by electromagnetic induction is :

    transformer

  • 2

    The purpose of the core in the transformer is:

    provides a path for the magnetic lines of flux.

  • 3

    The primary winding, which receives

    energy from the ac source.

  • 4

    The secondary winding, which

    receives energy from the primary winding and delivers it to the load.

  • 5

    secondary voltage may be either in or out of phase with the primary voltage depends on the :

    direction in which the windings are wound

  • 6

    To reduce eddy-current In a transformer you would :

    reduce the thickness of laminations in the magnetic core

  • 7

    In a transformer the core provides a

    path for the magnetic lines

  • 8

    An autotransformer has :

    1 coil

  • 9

    The current transformer are designed to be powering :

    ammeters

  • 10

    The total voltage induced into the secondary winding of a transformer is determined mainly by :

    the ratio of the number of turns in the primary to the number of turns in the secondary

  • 11

    Radio-Frequency Transformers used to couple circuits to which frequencies:

    above 20,000 Hz

  • 12

    If the input power to a transformer is 650 watts and the output power is 610 watts, what is the efficiency?

    94%

  • 13

    If a transformer of 5:1 with Vin=120V supplies a light of 24V/45A how much is the input current I=

    9A