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Home ‣ Electrical Engineering ‣ Transformers See What Others Are Saying!
  • Question

  • 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?


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

  • Correct Answer
  • 90 V 

    Explanation
    We know that, V2/V1 = N2/N1.

    Given V2 = 9v, N2/N1 = 0.1

    Therefore, 9v/V1 = 0.1

    V1 = 9v/0.1 = 90v.

    For more detail: Step Down Transformer - Circuit with Simulation.

    More questions

    • 1. The induced voltage across a stationary conductor in a stationary magnetic field is

    • Options
    • A. zero
    • B. reversed in polarity
    • C. increased
    • D. decreased
      • Discuss
    • 2. What is the current through R2?


    • Options
    • A. 3.19 A
    • B. 319 mA
    • C. 1.73 A
    • D. 173 mA
      • Discuss
    • 3. When the voltage across a capacitor is tripled, the stored charge

    • Options
    • A. triples
    • B. is cut to one-third
    • C. stays the same
    • D. doubles
      • Discuss
    • 4. Referring to the given circuit, determine ZTH as seen by RL.


    • Options
    • A. 1444∠?48.5° Ω
    • B. 4176 ∠?73.3° Ω
    • C. 956 ∠?48.5° Ω
    • D. 1444 ∠?73.3° Ω
      • Discuss
    • 5. The Thevenin equivalent voltage is

    • Options
    • A. equal to the source voltage
    • B. the same as the load voltage
    • C. the open circuit voltage
    • D. none of the above
      • Discuss
    • 6. Polyphase generators produce simultaneous multiple sinusoidal voltages that are separated by

    • Options
    • A. certain constant phase angles
    • B. certain constant frequencies
    • C. certain constant voltages
    • D. certain constant currents
      • Discuss
    • 7. Norton's theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent voltage source in series with an equivalent impedance.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. If one of the resistors in a parallel circuit is removed, the total resistance

    • Options
    • A. decreases
    • B. increases
    • C. remains the same
    • D. doubles
      • Discuss
    • 9. A 320 µH coil is in series with a 3.3 kΩ resistor. How long does it take for current to build up to its full value?

    • Options
    • A. 0.48 s
    • B. 0.48 ms
    • C. 0.48 µs
    • D. 48 s
      • Discuss
    • 10. The number 4.4 × 106 ohms expressed using a metric prefix is

    • Options
    • A. 4 k
    • B. 4.4 k
    • C. 4 M
    • D. 4.4 M
      • Discuss

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