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HAM Radio Extra Class Test Advanced Electrical Principles Questions and Answers Flashcards

6 cards from real HAM practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 HAM Radio Extra Class Test Advanced Electrical Principles Questions and Answers flashcards as text

  1. What is the characteristic impedance of a lossless transmission line determined by?

    Answer: The ratio of distributed inductance to distributed capacitance per unit length

    Characteristic impedance Z0 equals the square root of L/C per unit length for a lossless line.

  2. In a transformer with a 4:1 turns ratio, what is the impedance transformation ratio?

    Answer: 16:1

    Impedance transforms as the square of the turns ratio, so a 4:1 turns ratio gives a 16:1 impedance ratio.

  3. What is the power factor of a circuit with a phase angle of 60 degrees?

    Answer: 0.5

    Power factor equals the cosine of the phase angle, and cos(60 degrees) is 0.5.

  4. What is the resonant frequency of a circuit with L = 1 uH and C = 1 pF?

    Answer: Approximately 159 MHz

    Using f = 1/(2*pi*sqrt(LC)), with L = 1 uH and C = 1 pF, the resonant frequency is approximately 159 MHz.

  5. What does a negative reactance value indicate in a circuit?

    Answer: The circuit is capacitive

    Negative reactance indicates capacitive behavior, as capacitive reactance is conventionally represented as a negative value.

  6. What effect does mutual coupling between inductors have on total inductance when fields aid?

    Answer: Total inductance increases beyond the sum of individual inductances

    When magnetic fields aid each other, mutual inductance adds to the total, making it greater than L1 + L2.