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Transformer Practice Exam

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    Transformer Practice Exam

    What kVA rating is required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV?

    A. 4 kVA
    B. 0.25 kVA
    C. 16 kVA
    D. 8 kVA

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    Turns Ratio

    The turns ratio required to match an 80 source to a 320 load is

    A. 80
    B. 20
    C. 4
    D. 2

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    Turns Ratio

    When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is

    [A]. 12 V
    [B]. 120 V
    [C]. 240 V
    [D]. 2,400 V

  6. #4
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    reflective resistance

    If a transformer has 50 turns in the primary winding and 10 turns in the secondary winding, what is the reflective resistance if the secondary load resistance is 250 ?

    A. 250
    B. 25
    C. 6,250
    D. 62,500

  8. #5
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    secondary voltage

    The primary winding of a transformer has 110 V ac across it. What is the secondary voltage if the turns ratio is 8?

    A. 8.8 V
    B. 88 V
    C. 880 V
    D. 8,800 V

  10. #6
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    turns ratio

    To step 110 V ac down to 20 V ac, the turns ratio must be

    A. 5.5
    B. 18
    C. 0.18
    D. 0.018

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    power delivered

    If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is

    A. 25 W
    B. 0 W
    C. 250 W
    D. 2.5 W

  14. #8
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    voltage across the load

    A transformer with a 110 V primary has a 15:1 turns ratio. The load resistance, RL, is 120 . What is the approximate voltage across the load?

    A. 7.3 V
    B. 73 V
    C. 88 V
    D. 880 V

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    secondary voltage

    How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?

    A. 9 V
    B. 90 V
    C. 900 V
    D. 0.9 V

  18. #10
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    secondary current

    In a certain loaded transformer, the secondary voltage is one-fourth the primary voltage. The secondary current is

    A. one-fourth the primary current
    B. four times the primary current
    C. equal to the primary current
    D. one-fourth the primary current and equal to the primary current

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