E5A01:

What can cause the voltage across reactances in series to be larger than the voltage applied to them?

  1. Resonance
  2. Capacitance
  3. Conductance
  4. Resistance

E5A02:

What is resonance in an electrical circuit?

  1. The highest frequency that will pass current
  2. The lowest frequency that will pass current
  3. The frequency at which the capacitive reactance equals the inductive reactance
  4. The frequency at which the reactive impedance equals the resistive impedance

E5A03:

What is the magnitude of the impedance of a series RLC circuit at resonance?

  1. High, as compared to the circuit resistance
  2. Approximately equal to capacitive reactance
  3. Approximately equal to inductive reactance
  4. Approximately equal to circuit resistance

E5A04:

What is the magnitude of the impedance of a circuit with a resistor, an inductor and a capacitor all in parallel, at resonance?

  1. Approximately equal to circuit resistance
  2. Approximately equal to inductive reactance
  3. Low, as compared to the circuit resistance
  4. Approximately equal to capacitive reactance

E5A05:

What is the magnitude of the current at the input of a series RLC circuit as the frequency goes through resonance?

  1. Minimum
  2. Maximum
  3. R/L
  4. L/R

E5A06:

What is the magnitude of the circulating current within the components of a parallel LC circuit at resonance?

  1. It is at a minimum
  2. It is at a maximum
  3. It equals 1 divided by the quantity 2 times Pi, multiplied by the square root of inductance L multiplied by capacitance C
  4. It equals 2 multiplied by Pi, multiplied by frequency, multiplied by inductance

E5A07:

What is the magnitude of the current at the input of a parallel RLC circuit at resonance?

  1. Minimum
  2. Maximum
  3. R/L
  4. L/R

E5A08:

What is the phase relationship between the current through and the voltage across a series resonant circuit at resonance?

  1. The voltage leads the current by 90 degrees
  2. The current leads the voltage by 90 degrees
  3. The voltage and current are in phase
  4. The voltage and current are 180 degrees out of phase

E5A09:

How is the Q of an RLC parallel resonant circuit calculated?

  1. Reactance of either the inductance or capacitance divided by the resistance
  2. Reactance of either the inductance or capacitance multiplied by the resistance
  3. Resistance divided by the reactance of either the inductance or capacitance
  4. Reactance of the inductance multiplied by the reactance of the capacitance

E5A10:

How is the Q of an RLC series resonant circuit calculated?

  1. Reactance of either the inductance or capacitance divided by the resistance
  2. Reactance of either the inductance or capacitance times the resistance
  3. Resistance divided by the reactance of either the inductance or capacitance
  4. Reactance of the inductance times the reactance of the capacitance

E5A11:

What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 7.1 MHz and a Q of 150?

  1. 157.8 Hz
  2. 315.6 Hz
  3. 47.3 kHz
  4. 23.67 kHz

E5A12:

What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 3.7 MHz and a Q of 118?

  1. 436.6 kHz
  2. 218.3 kHz
  3. 31.4 kHz
  4. 15.7 kHz

E5A13:

What is an effect of increasing Q in a resonant circuit?

  1. Fewer components are needed for the same performance
  2. Parasitic effects are minimized
  3. Internal voltages and circulating currents increase
  4. Phase shift can become uncontrolled

E5A14:

What is the resonant frequency of a series RLC circuit if R is 22 ohms, L is 50 microhenrys and C is 40 picofarads?

  1. 44.72 MHz
  2. 22.36 MHz
  3. 3.56 MHz
  4. 1.78 MHz

E5A15:

Which of the following can increase Q for inductors and capacitors?

  1. Lower losses
  2. Lower reactance
  3. Lower self-resonant frequency
  4. Higher self-resonant frequency

E5A16:

What is the resonant frequency of a parallel RLC circuit if R is 33 ohms, L is 50 microhenrys and C is 10 picofarads?

  1. 23.5 MHz
  2. 23.5 kHz
  3. 7.12 kHz
  4. 7.12 MHz

E5A17:

What is the result of increasing the Q of an impedance-matching circuit?

  1. Matching bandwidth is decreased
  2. Matching bandwidth is increased
  3. Matching range is increased
  4. It has no effect on impedance matching