136 + Mcqs in Rlc Circuits And Resonance in Electronics Page 2 McqOptions

51.	In a series RLC circuit, the larger reactance determines the net reactance of the circuit.
A.	True
B.	False
Answer» B. False

Discussion

52.	In a parallel RLC circuit, the smaller reactance determines the net reactance of the circuit.
A.	True
B.	False
Answer» B. False

Discussion

53.	The impedance at the resonant frequency of a series RLC circuit with L = 20 mH, C = 0.02 µF, and RW = 90 Ω is
A.	0 Ω
B.	90 Ω
C.	20 Ω
D.	40 Ω
Answer» C. 20 Ω

Discussion

54.	A 6.8 kΩ resistor, a 7 mH coil, and a 0.02 µF capacitor are in parallel across a 17 kHz ac source. The coil's internal resistance, RW, is 30 Ω. The equivalent parallel resistance, Rp(eq), is
A.	1,878 Ω
B.	18,780 Ω
C.	18,750 Ω
D.	626 Ω
Answer» C. 18,750 Ω

Discussion

55.	A certain series resonant circuit has a bandwidth of 2 kHz. If the existing coil is replaced with one having a higher value of Q, the bandwidth will
A.	Increase
B.	Remain the same
C.	Decrease
D.	Be less selective
Answer» D. Be less selective

Discussion

56.	A lower Q produces a narrower bandwidth.
A.	True
B.	False
Answer» C.

Discussion

57.	If the value of C in a series RLC circuit is decreased, the resonant frequency increases
A.	True
B.	False
Answer» B. False

Discussion

58.	Resonance is a condition in a series RLC circuit in which the capacitive and inductive reactances are equal in magnitude.
A.	True
B.	False
Answer» B. False

Discussion

59.	The voltage across the inductor is ______ in the given circuit.
A.	6.5 V
B.	12.4 V
C.	14 V
D.	50 V
Answer» E.

Discussion

60.	If the given circuit were at resonance, the total current would be at its maximum.
A.	1
B.
Answer» B.

Discussion

61.	The voltage across the inductor is 77.8 volts.
A.	1
B.
Answer» C.

Discussion

62.	The ______ of a circuit describes the ability of that circuit to respond to certain frequencies while rejecting all others.
A.	bandwidth
B.	selectivity
C.	sensitivity
D.	quality factor
Answer» C. sensitivity

Discussion

63.	The quality factor at resonance of a series circuit is VR/VL.
A.	1
B.
Answer» C.

Discussion

64.	The impedance is 9684 .
A.	1
B.
Answer» B.

Discussion

65.	The less selective a filter is, the steeper the slope of its curves at the cutoff frequencies.
A.	1
B.
Answer» C.

Discussion

66.	When a parallel tank circuit is used in series with an output load resistor the filter is ______.
A.	low-pass
B.	band-stop
C.	band-pass
D.	high-pass
Answer» C. band-pass

Discussion

67.	At frequencies well above and below the resonant frequency, the series RLC circuit looks ______ and the parallel RLC circuit looks ______.
A.	like a short, like an open
B.	like an open, like a short
C.	inductive, capacitive
D.	capacitive, inductive
Answer» E.

Discussion

68.	The greater the selectivity, the wider the bandwidth.
A.	1
B.
Answer» C.

Discussion

69.	The bandwidth of a filter is the range of frequencies between the half-power frequencies.
A.	1
B.
Answer» B.

Discussion

70.	If the output voltage were taken across the resistor in the given circuit, the circuit would be a band-stop filter.
A.	1
B.
Answer» B.

Discussion

71.	The quality factor of a parallel circuit at resonance is VC/VS or VL/VS.
A.	1
B.
Answer» B.

Discussion

72.	By increasing the resistance of a coil you can increase the Q of the coil at resonance.
A.	1
B.
Answer» C.

Discussion

73.	A parallel tuned circuit can be used to couple energy from one circuit to another.
A.	1
B.
Answer» B.

Discussion

74.	Series resonance happens when _____.
A.	XC = XC
B.	XL = XC
C.	XL = XB
D.	XT = R
Answer» C. XL = XB

Discussion

75.	If the output voltage were taken from across the resistor in the given circuit, the circuit would be a band-pass filter.
A.	1
B.
Answer» B.

Discussion

76.	The output voltage at the resonant frequency is _____ in the given circuit.
A.	0 V
B.	557 mV
C.	6.08 V
D.	6.5 V
Answer» D. 6.5 V

Discussion

77.	The impedance is 160 .
A.	1
B.
Answer» C.

Discussion

78.	The total circuit current is _____ in the given circuit.
A.	1.52 mA
B.	1.61 mA
C.	2.21 mA
D.	2.71 mA
Answer» D. 2.71 mA

Discussion

79.	If the given circuit in were operating at resonance, the total current would be maximum.
A.	1
B.
Answer» C.

Discussion

80.	Series LC combinations are used more often in tuned amplifier circuits than are parallel LC combinations.
A.	1
B.
Answer» C.

Discussion

81.	The current lags the voltage in the given circuit.
A.	1
B.
C.	1
D.
Answer» B.

Discussion

82.	When a parallel circuit resonates it is said to:
A.	flywheel
B.	oscillate
C.	both of the above
D.	none of the above
Answer» D. none of the above

Discussion

83.	What is the current through the capacitor in the given circuit?
A.	3.5 mA
B.	5.5 mA
C.	9 mA
D.	11.4 mA
Answer» B. 5.5 mA

Discussion

84.	What is the bandwidth of the circuit in the given circuit?
A.	11.6 Hz
B.	275.9 Hz
C.	1.5 kHz
D.	3.2 kHz
Answer» C. 1.5 kHz

Discussion

85.	What is the voltage across the capacitor in the given circuit?
A.	6.8 V
B.	11.9 V
C.	16.1 V
D.	22.9 V
Answer» E.

Discussion

86.	What is the quality factor?
A.	999
B.	223
C.	2.2
D.	0.99
Answer» D. 0.99

Discussion

87.	This circuit is a high-pass filter.
A.	1
B.
C.	1
D.
Answer» C. 1

Discussion

88.	The output voltage is _____ at the resonant frequency in the given circuit.
A.	0 mV
B.	31.4 mV
C.	66.5 mV
D.	380 mV
Answer» D. 380 mV

Discussion

89.	When XC = XL the circuit:
A.	draws maximum current
B.	applied voltage is zero
C.	is at resonance
D.	draws minimum current
Answer» D. draws minimum current

Discussion

90.	Current in a series RLC circuit may always be used as:
A.	a leading vector
B.	a reference
C.	an angle
D.	a lagging vector
Answer» C. an angle

Discussion

91.	What is the total current for the nonideal circuit in the given circuit. If it is at resonance?
A.	0
B.	284 A
C.	3.3 mA
D.	38.5 mA
Answer» C. 3.3 mA

Discussion

92.	The bandwidth is ______ in the given circuit.
A.	179.28 Hz
B.	3.54 kHz
C.	4.44 kHz
D.	15.85 kHz
Answer» C. 4.44 kHz

Discussion

93.	The resonant frequency fo is 19 kHz.
A.	1
B.
Answer» C.

Discussion

94.	At any resonant frequency, what voltage is measured across the two series reactive components?
A.	applied
B.	reactive
C.	zero
D.	inductive and capacitive
Answer» D. inductive and capacitive

Discussion

95.	At any resonant frequency, what net voltage is measured across the two series reactive components?
A.	Applied voltage
B.	Reactive voltage
C.	Zero voltage
D.	VL + VC voltage
Answer» D. VL + VC voltage

Discussion

96.	What would be the power factor for an RLC circuit that acts inductively?
A.	+90 degrees leading
B.	one
C.	zero
D.	‚Äì90 degrees lagging
Answer» D. ‚Äì90 degrees lagging

Discussion

97.	What is the resonance frequency?
A.	31.8 Hz
B.	71 Hz
C.	7.1 kHz
D.	31.8 kHz
Answer» C. 7.1 kHz

Discussion

98.	When inductive and capacitive reactance are present in the same series circuit, the magnitude of the total reactance is equal to the sum of the magnitudes of the individual reactances.
A.	1
B.
C.	1
D.
Answer» C. 1

Discussion

99.	The impedance is 1177 .
A.	1
B.
Answer» B.

Discussion

100.	The ___ of a circuit describes the ability of that circuit to respond to certain frequencies while rejecting all others.
A.	bandwidth
B.	selectivity
C.	sensitivity
D.	quality factor
Answer» C. sensitivity

Discussion

Explore topic-wise MCQs in Electronics.

In a series RLC circuit, the larger reactance determines the net reactance of the circuit.

In a parallel RLC circuit, the smaller reactance determines the net reactance of the circuit.

The impedance at the resonant frequency of a series RLC circuit with L = 20 mH, C = 0.02 µF, and RW = 90 Ω is

A 6.8 kΩ resistor, a 7 mH coil, and a 0.02 µF capacitor are in parallel across a 17 kHz ac source. The coil's internal resistance, RW, is 30 Ω. The equivalent parallel resistance, Rp(eq), is

A certain series resonant circuit has a bandwidth of 2 kHz. If the existing coil is replaced with one having a higher value of Q, the bandwidth will

A lower Q produces a narrower bandwidth.

If the value of C in a series RLC circuit is decreased, the resonant frequency increases

Resonance is a condition in a series RLC circuit in which the capacitive and inductive reactances are equal in magnitude.

The voltage across the inductor is ______ in the given circuit.

If the given circuit were at resonance, the total current would be at its maximum.

The voltage across the inductor is 77.8 volts.

The ______ of a circuit describes the ability of that circuit to respond to certain frequencies while rejecting all others.

The quality factor at resonance of a series circuit is VR/VL.

The impedance is 9684 .

The less selective a filter is, the steeper the slope of its curves at the cutoff frequencies.

When a parallel tank circuit is used in series with an output load resistor the filter is ______.

At frequencies well above and below the resonant frequency, the series RLC circuit looks ______ and the parallel RLC circuit looks ______.

The greater the selectivity, the wider the bandwidth.

The bandwidth of a filter is the range of frequencies between the half-power frequencies.

If the output voltage were taken across the resistor in the given circuit, the circuit would be a band-stop filter.

The quality factor of a parallel circuit at resonance is VC/VS or VL/VS.

By increasing the resistance of a coil you can increase the Q of the coil at resonance.

A parallel tuned circuit can be used to couple energy from one circuit to another.

Series resonance happens when _____.

If the output voltage were taken from across the resistor in the given circuit, the circuit would be a band-pass filter.

The output voltage at the resonant frequency is _____ in the given circuit.

The impedance is 160 .

The total circuit current is _____ in the given circuit.

If the given circuit in were operating at resonance, the total current would be maximum.

Series LC combinations are used more often in tuned amplifier circuits than are parallel LC combinations.

The current lags the voltage in the given circuit.

When a parallel circuit resonates it is said to:

What is the current through the capacitor in the given circuit?

What is the bandwidth of the circuit in the given circuit?

What is the voltage across the capacitor in the given circuit?

What is the quality factor?

This circuit is a high-pass filter.

The output voltage is _____ at the resonant frequency in the given circuit.

When XC = XL the circuit:

Current in a series RLC circuit may always be used as:

What is the total current for the nonideal circuit in the given circuit. If it is at resonance?

The bandwidth is ______ in the given circuit.

The resonant frequency fo is 19 kHz.

At any resonant frequency, what voltage is measured across the two series reactive components?

At any resonant frequency, what net voltage is measured across the two series reactive components?

What would be the power factor for an RLC circuit that acts inductively?

What is the resonance frequency?

When inductive and capacitive reactance are present in the same series circuit, the magnitude of the total reactance is equal to the sum of the magnitudes of the individual reactances.

The impedance is 1177 .

The ___ of a circuit describes the ability of that circuit to respond to certain frequencies while rejecting all others.

At frequencies well above and below the resonant frequency, the series RLC circuit looks and the parallel RLC circuit looks .