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NEW Extra Class Exam Question Pool

effective 7/01/2012 thru 6/30/2016

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E5A-2012: Resonance and Q: characteristics of resonant circuits: series and parallel resonance; Q; half-power bandwidth; phase relationships in reactive circuits

E5A01-2012: What can cause the voltage across reactances in series to be larger than the voltage applied to them?

Resonance

Capacitance

Conductance

Resistance



E5A02-2012: What is resonance in an electrical circuit?

The frequency at which the capacitive reactance equals the inductive reactance

The highest frequency that will pass current

The lowest frequency that will pass current

The frequency at which the reactive impedance equals the resistive impedance



E5A03-2012: What is the magnitude of the impedance of a series RLC circuit at resonance?

Approximately equal to circuit resistance

High, as compared to the circuit resistance

Approximately equal to capacitive reactance

Approximately equal to inductive reactance



E5A04-2012: What is the magnitude of the impedance of a circuit with a resistor, an inductor and a capacitor all in parallel, at resonance?

Approximately equal to circuit resistance

Approximately equal to inductive reactance

Low, as compared to the circuit resistance

Approximately equal to capacitive reactance



E5A05-2012: What is the magnitude of the current at the input of a series RLC circuit as the frequency goes through resonance?

Maximum

Minimum

R/L

L/R



E5A06-2012: What is the magnitude of the circulating current within the components of a parallel LC circuit at resonance?

It is at a maximum

It is at a minimum

It equals 1 divided by the quantity 2 times Pi, multiplied by the square root of inductance L multiplied by capacitance C

It equals 2 multiplied by Pi, multiplied by frequency "F", multiplied by inductance "L"



E5A07-2012: What is the magnitude of the current at the input of a parallel RLC circuit at resonance?

Minimum

Maximum

R/L

L/R



E5A08-2012: What is the phase relationship between the current through and the voltage across a series resonant circuit at resonance?

The voltage and current are in phase

The voltage leads the current by 90 degrees

The current leads the voltage by 90 degrees

The voltage and current are 180 degrees out of phase



E5A09-2012: What is the phase relationship between the current through and the voltage across a parallel resonant circuit at resonance?

The voltage and current are in phase

The voltage leads the current by 90 degrees

The current leads the voltage by 90 degrees

The voltage and current are 180 degrees out of phase



E5A10-2012: What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 1.8 MHz and a Q of 95?

18.9 kHz

1.89 kHz

94.5 kHz

9.45 kHz



E5A11-2012: 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?

47.3 kHz

157.8 Hz

315.6 Hz

23.67 kHz



E5A12-2012: 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?

31.4 kHz

436.6 kHz

218.3 kHz

15.7 kHz



E5A13-2012: What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 14.25 MHz and a Q of 187?

76.2 kHz

38.1 kHz

1.332 kHz

2.665 kHz



E5A14-2012: What is the resonant frequency of a series RLC circuit if R is 22 ohms, L is 50 microhenrys and C is 40 picofarads?

3.56 MHz

44.72 MHz

22.36 MHz

1.78 MHz



E5A15-2012: What is the resonant frequency of a series RLC circuit if R is 56 ohms, L is 40 microhenrys and C is 200 picofarads?

1.78 MHz

3.76 MHz

11.18 MHz

22.36 MHz



E5A16-2012: What is the resonant frequency of a parallel RLC circuit if R is 33 ohms, L is 50 microhenrys and C is 10 picofarads?

7.12 MHz

23.5 MHz

23.5 kHz

7.12 kHz



E5A17-2012: What is the resonant frequency of a parallel RLC circuit if R is 47 ohms, L is 25 microhenrys and C is 10 picofarads?

10.1 MHz

63.2 MHz

10.1 kHz

63.2 kHz





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E5B-2012: Time constants and phase relationships: RLC time constants: definition; time constants in RL and RC circuits; phase angle between voltage and current; phase angles of series and parallel circuits
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