chris/Extra-Study
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases 1 Activity
Extra-Study/pages/E5A.md
Chris ce979dddb4 Initial checkin
2025-05-01 15:49:18 -05:00

3.7 KiB
Raw Permalink Blame History

E5A Resonance and Q: characteristics of resonant circuits; series and parallel resonance; definitions and effects of Q; half-power bandwidth

  • E5A01 (A) What can cause the voltage across reactances in a series RLC circuit to be higher than the voltage applied to the entire circuit? #card
    • A. Resonance
    • B. Capacitance
    • C. Low quality factor (Q)
    • D. Resistance
  • E5A02 (C) What is the resonant frequency of an RLC circuit if R is 22 ohms, L is 50 microhenries, and C is 40 picofarads? #card
    • A. 44.72 MHz
    • B. 22.36 MHz
    • C. 3.56 MHz
    • D. 1.78 MHz
  • E5A03 (D) What is the magnitude of the impedance of a series RLC circuit at resonance? #card
    • A. High, compared to the circuit resistance
    • B. Approximately equal to capacitive reactance
    • C. Approximately equal to inductive reactance
    • D. Approximately equal to circuit resistance
  • E5A04 (A) What is the magnitude of the impedance of a parallel RLC circuit at resonance? #card
    • A. Approximately equal to circuit resistance
    • B. Approximately equal to inductive reactance
    • C. Low compared to the circuit resistance
    • D. High compared to the circuit resistance
  • E5A05 (A) What is the result of increasing the Q of an impedance-matching circuit? #card
    • A. Matching bandwidth is decreased
    • B. Matching bandwidth is increased
    • C. Losses increase
    • D. Harmonics increase
  • E5A06 (B) What is the magnitude of the circulating current within the components of a parallel LC circuit at resonance? #card
    • A. It is at a minimum
    • B. It is at a maximum
    • C. It equals 1 divided by the quantity 2 times pi, times the square root of (inductance L multiplied by capacitance C)
    • D. It equals 2 times pi, times the square root of (inductance L multiplied by capacitance C)
  • E5A07 (A) What is the magnitude of the current at the input of a parallel RLC circuit at resonance? #card
  • E5A08 (C) What is the phase relationship between the current through and the voltage across a series resonant circuit at resonance? #card
    • A. The voltage leads the current by 90 degrees
    • B. The current leads the voltage by 90 degrees
    • C. The voltage and current are in phase
    • D. The voltage and current are 180 degrees out of phase
  • E5A09 (C) How is the Q of an RLC parallel resonant circuit calculated? #card
    • A. Reactance of either the inductance or capacitance divided by the resistance
    • B. Reactance of either the inductance or capacitance multiplied by the resistance
    • C. Resistance divided by the reactance of either the inductance or capacitance
    • D. Reactance of the inductance multiplied by the reactance of the capacitance
  • E5A10 (A) What is the resonant frequency of an RLC circuit if R is 33 ohms, L is 50 microhenries, and C is 10 picofarads? #card
    • A. 7.12 MHz
    • B. 23.5 kHz
    • C. 7.12 kHz
    • D. 23.5 MHz
  • E5A11 (C) What is the half-power bandwidth of a resonant circuit that has a resonant frequency of 7.1 MHz and a Q of 150? #card
    • A. 157.8 Hz
    • B. 315.6 Hz
    • C. 47.3 kHz
    • D. 23.67 kHz
  • E5A12 (C) What is the half-power bandwidth of a resonant circuit that has a resonant frequency of 3.7 MHz and a Q of 118? #card
    • A. 436.6 kHz
    • B. 218.3 kHz
    • C. 31.4 kHz
    • D. 15.7 kHz
  • E5A13 (C) What is an effect of increasing Q in a series resonant circuit? #card
    • A. Fewer components are needed for the same performance
    • B. Parasitic effects are minimized
    • C. Internal voltages increase
    • D. Phase shift can become uncontrolled