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


  • Options
  • A. 250 Ω
  • B. 25 Ω
  • C. 6,250 Ω
  • D. 62,500 Ω

  • Correct Answer
  • 6,250 Ω 


  • More questions

    • 1. A 470 Ω resistor and a coil with 125 Ω inductive reactance are in parallel. Both components are across a 15 V ac voltage source. Current through the inductor is

    • Options
    • A. 152 mA
    • B. 32 mA
    • C. 12 mA
    • D. 120 mA
    • Discuss
    • 2. The primary of a transformer is connected to a 6 V battery. The turns ratio is 1:3 and the secondary load, RL, is 100 Ω. The voltage across the load is

    • Options
    • A. 0 V
    • B. 6 V
    • C. 18 V
    • D. 2 V
    • Discuss
    • 3. A 2 µF, a 4 µF, and a 10 µF capacitor are connected in series. The total capacitance is less than

    • Options
    • A. 2 µF
    • B. 4 µF
    • C. 10 µF
    • D. 1.5 µF
    • Discuss
    • 4. What is the voltage source for a circuit carrying 2 A of current through a 36 Ω resistor?

    • Options
    • A. 1.8 V
    • B. 18 V
    • C. 7.2 V
    • D. 72 V
    • Discuss
    • 5. If there is 6 A of current through the filament of a lamp, how many coulombs of charge move through the filament in 1.75 s?

    • Options
    • A. 10.5 C
    • B. 105 C
    • C. 3.4 C
    • D. 34 C
    • Discuss
    • 6. A phasor represents

    • Options
    • A. the magnitude and a quantity direction
    • B. the width of a quantity
    • C. the phase angle
    • D. the magnitude of a quantity
    • Discuss
    • 7. The voltages in Problem 4 are measured at a certain frequency. To make the capacitor voltage greater than the resistor voltage, the frequency

    • Options
    • A. must be increased
    • B. must be decreased
    • C. is held constant
    • D. has no effect
    • Discuss
    • 8. A parallel resonant band-pass filter consists of a 6.8 Ω resistor in series with a parallel network made up of an 8 µH coil and a 120 pF capacitor. The output is taken across the capacitor/coil. Assume RW = 0 Ω. What is the center frequency of the filter?

    • Options
    • A. 5.14 MHz
    • B. 514 kHz
    • C. 5.03 MHz
    • D. 503 kHz
    • Discuss
    • 9. The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is

    • Options
    • A. 1 A
    • B. 7 A
    • C. unknown
    • D. the larger of the two
    • Discuss
    • 10. Four equal-value resistors are connected in parallel. Ten volts are applied across the parallel circuit and 2 mA are measured from the source. The value of each resistor is

    • Options
    • A. 12.5 Ω
    • B. 200 Ω
    • C. 20 KΩ
    • D. 50 Ω
    • Discuss


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