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Home ‣ Electronics ‣ Transformers See What Others Are Saying!
  • Question

  • A transformer is plugged into a 120 V rms source and has a primary current of 300 mA rms. The secondary is providing 18 V across a 10 Ω load. What is the efficiency of the transformer?


  • Options
  • A. 88%
  • B. 90%
  • C. 92%
  • D. 95%

  • Correct Answer
  • 90% 

    • More questions

    • 1. XL = 2ΠfL

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. A voltage is induced across a conductor if it remains absolutely stationary within a magnetic field.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. 

      How much current flows in the circuit in the given circuit?


    • Options
    • A. 20 µA
    • B. 60 µA
    • C. 80 µA
    • D. 140 µA
      • Discuss
    • 4. The time constant of an inductive circuit is dependent on the circuit's resistance.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. When the output of a tri-state shift register is disabled, the output level is placed in a:

    • Options
    • A. float state
    • B. LOW state
    • C. high impedance state
    • D. float state and a high impedance state
      • Discuss
    • 6. 

      If the load doubled in value in the given circuit, what reflected resistance would the source see?


    • Options
    • A. 80 Ω
    • B. 400 Ω
    • C. 2 kΩ
    • D. 10 kΩ
      • Discuss
    • 7. In a 20 Vac series RC circuit, if 20 V is read across the resistor and 40 V is measured across the capacitor, the applied voltage is

    • Options
    • A. 45 Vac
    • B. 50 Vac
    • C. 60 Vac
    • D. 65 Vac
      • Discuss
    • 8. Capacitance is directly proportional to the dielectric constant and the distance between its plates and inversely proportional to the area of the plates.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. If both inputs are required to be ON for the output to be ON, the gate must be an AND gate.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. What circuit has the following frequency response?


    • Options
    • A. bandpass filter
    • B. high-pass filter
    • C. low-pass filter
    • D. integrator
      • Discuss

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