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GIBILISCO CHAP 2

GIBILISCO CHAP 2
20問 • 2年前
  • Czy Gamat
    • 通報

    問題一覧

  • 1

    A positive electric pole:

    B. Has fewer electrons than the negative pole.

  • 2

    An EMF of one volt:

    C. Can sometimes produce a large current.

  • 3

    A potentially lethal electric current is on the order of:

    D. 0.1 A.

  • 4

    A current of 25 A is most likely drawn by:

    B. A typical household.

  • 5

    A piece of wire has a conductance of 20 siemens. Its resistance is:

    C. 0.05 Ω.

  • 6

    A resistor has a value of 300 ohms. Its conductance is:

    A. 3.33 millisiemens.

  • 7

    A mile of wire has a conductance of 0.6 siemens. Then three miles of the same wire has a conductance of:

    C. 0.2 siemens.

  • 8

    A 2-kW generator will deliver approximately how much current, reliably, at 117 V?

    C. 17 A.

  • 9

    A circuit breaker is rated for 15 A at 117 V. This represents approximately how many kilowatts?

    A. 1.76.

  • 10

    You are told that a certain air conditioner is rated at 500 Btu. What is this in kWh?

    D. 0.147.

  • 11

    Of the following energy units, the one most often used to define electrical energy is:

    D. The kilowatt hour.

  • 12

    The frequency of common household ac in the U.S. is:

    A. 60 Hz.

  • 13

    Half-wave rectification means that:

    B. Half of the ac wave is chopped off.

  • 14

    In the output of a half-wave rectifier:

    B. The effective value is less than that of the original ac wave.

  • 15

    In the output of a full-wave rectifier:

    C. The effective value is the same as that of the original ac wave.

  • 16

    A low voltage, such as 12 V:

    D. Can be dangerous under certain conditions.

  • 17

    Which of these can represent magnetomotive force?

    B. The ampere-turn.

  • 18

    Which of the following units can represent magnetic flux density?

    C. The gauss.

  • 19

    A ferromagnetic material:

    A. Concentrates magnetic flux lines within itself.

  • 20

    A coil has 500 turns and carries 75 mA of current. The magnetomotive force will be:

    C. 37.5 At.

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    問題一覧

  • 1

    A positive electric pole:

    B. Has fewer electrons than the negative pole.

  • 2

    An EMF of one volt:

    C. Can sometimes produce a large current.

  • 3

    A potentially lethal electric current is on the order of:

    D. 0.1 A.

  • 4

    A current of 25 A is most likely drawn by:

    B. A typical household.

  • 5

    A piece of wire has a conductance of 20 siemens. Its resistance is:

    C. 0.05 Ω.

  • 6

    A resistor has a value of 300 ohms. Its conductance is:

    A. 3.33 millisiemens.

  • 7

    A mile of wire has a conductance of 0.6 siemens. Then three miles of the same wire has a conductance of:

    C. 0.2 siemens.

  • 8

    A 2-kW generator will deliver approximately how much current, reliably, at 117 V?

    C. 17 A.

  • 9

    A circuit breaker is rated for 15 A at 117 V. This represents approximately how many kilowatts?

    A. 1.76.

  • 10

    You are told that a certain air conditioner is rated at 500 Btu. What is this in kWh?

    D. 0.147.

  • 11

    Of the following energy units, the one most often used to define electrical energy is:

    D. The kilowatt hour.

  • 12

    The frequency of common household ac in the U.S. is:

    A. 60 Hz.

  • 13

    Half-wave rectification means that:

    B. Half of the ac wave is chopped off.

  • 14

    In the output of a half-wave rectifier:

    B. The effective value is less than that of the original ac wave.

  • 15

    In the output of a full-wave rectifier:

    C. The effective value is the same as that of the original ac wave.

  • 16

    A low voltage, such as 12 V:

    D. Can be dangerous under certain conditions.

  • 17

    Which of these can represent magnetomotive force?

    B. The ampere-turn.

  • 18

    Which of the following units can represent magnetic flux density?

    C. The gauss.

  • 19

    A ferromagnetic material:

    A. Concentrates magnetic flux lines within itself.

  • 20

    A coil has 500 turns and carries 75 mA of current. The magnetomotive force will be:

    C. 37.5 At.