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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 skin effect in RF conductors?

    Answer: Current flows only on the surface of the conductor at high frequencies

    Skin effect causes RF current to concentrate near the outer surface of a conductor, increasing effective resistance at higher frequencies.

  2. In a series RLC circuit at resonance, what is the impedance equal to?

    Answer: The resistance only

    At resonance the inductive and capacitive reactances cancel, leaving only the resistance as the total impedance.

  3. What is the quality factor (Q) of a parallel resonant circuit with R = 10 kohms, L = 10 uH, and C = 10 pF?

    Answer: 100

    For a parallel RLC circuit, Q = R / (2 * pi * f * L), and at resonance with these values Q equals approximately 100.

  4. What happens to the time constant of an RC circuit if the capacitance is doubled?

    Answer: The time constant doubles

    The time constant tau equals R times C, so doubling the capacitance directly doubles the time constant.

  5. What is the phase angle between voltage and current in a purely inductive circuit?

    Answer: Voltage leads current by 90 degrees

    In a purely inductive circuit, voltage leads current by exactly 90 degrees due to the inductor opposing changes in current.

  6. What is the equivalent capacitance of two 100 pF capacitors connected in series?

    Answer: 50 pF

    Two equal capacitors in series yield half the value of one, so two 100 pF capacitors in series equal 50 pF.