SUBELEMENT E5 -- ELECTRICAL PRINCIPLES [9 Exam Questions -- 9 Groups]
E5A Characteristics of resonant
circuits: Series resonance (capacitor
and
inductor to resonate at a specific frequency); Parallel resonance
(capacitor and inductor to resonate at a specific frequency); half-
power
bandwidth
E5A01
(A)
What
can cause the voltage across reactances in series to be larger than the voltage
applied to them?
A. Resonance
B. Capacitance
C. Conductance
D. Resistance
E5A02
(C)
What is
resonance in an electrical circuit?
A. The highest frequency that will pass current
B. The lowest frequency that will pass current
C. The frequency at which
capacitive reactance equals inductive reactance
D. The frequency at which power factor is at a
minimum
E5A03
(B)
What
are the conditions for resonance to occur in an electrical circuit?
A. The power factor is at a minimum
B. Inductive and capacitive
reactances are equal
C. The square root of the sum of the capacitive
and inductive reactance is equal to the resonant frequency
D. The square root of the product of the
capacitive and inductive reactance is equal to the resonant frequency
E5A04
(D)
When
the inductive reactance of an electrical circuit equals its capacitive
reactance, what is this condition called?
A. Reactive quiescence
B. High Q
C. Reactive equilibrium
D. Resonance
E5A05
(D)
What is
the magnitude of the impedance of a series R-L-C circuit at resonance?
A. High, as compared to the circuit resistance
B. Approximately equal to capacitive reactance
C. Approximately equal to inductive reactance
D. Approximately equal to
circuit resistance
E5A06
(A)
What is
the magnitude of the impedance of a circuit with a resistor, an inductor and a
capacitor all in parallel, at resonance?
A. Approximately equal to
circuit resistance
B. Approximately equal to inductive reactance
C. Low, as compared to the circuit resistance
D. Approximately equal to capacitive reactance
E5A07
(B)
What is
the magnitude of the current at the input of a series R-L-C circuit at
resonance?
A. It is at a minimum
B. It is at a maximum
C. It is DC
D. It is zero
E5A08
(B)
What is
the magnitude of the circulating current within the components of a parallel
L-C circuit at resonance?
A. It is at a minimum
B. It is at a maximum
C. It is DC
D. It is zero
E5A09
(A)
What is
the magnitude of the current at the input of a parallel R-L-C circuit at
resonance?
A. It is at a minimum
B. It is at a maximum
C. It is DC
D. It is zero
E5A10
(C)
What is
the relationship between the current through a resonant circuit and the voltage
across the circuit?
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
E5A11
(C)
What is
the relationship between the current into (or out of) a parallel resonant
circuit and the voltage across the circuit?
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
E5A12
(A)
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?
A. 18.9 kHz
B. 1.89 kHz
C. 189 Hz
D. 58.7 kHz
E5A13
(C)
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?
A. 211 kHz
B. 16.5 kHz
C. 47.3 kHz
D. 21.1 kHz
E5A14
(A)
What is
the half-power bandwidth of a parallel resonant circuit that has a resonant
frequency of 14.25 MHz and a Q of 150?
A. 95 kHz
B. 10.5 kHz
C. 10.5 MHz
D. 17 kHz
E5A15
(D)
What is
the half-power bandwidth of a parallel resonant circuit that has a resonant
frequency of 21.15 MHz and a Q of 95?
A. 4.49 kHz
B. 44.9 kHz
C. 22.3 kHz
D. 222.6 kHz
E5A16
(C)
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?
A. 22.3 kHz
B. 76.2 kHz
C. 31.4 kHz
D. 10.8 kHz
E5A17
(C)
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?
A. 22.3 kHz
B. 10.8 kHz
C. 76.2 kHz
D. 13.1 kHz