In a series circuit that is operating above the resonant frequency, the current

is in phase with the applied voltage

In a series RLC circuit that is operating above the resonant frequency, the current

is in phase with the applied voltage

50 + Mcqs in Rlc Circuits And Resonance in Electrical Engineering Page 1 McqOptions

1.	Referring to Problem 10, the total current is
A.	5.3 mA
B.	4.6 A
C.	4.6 mA
D.	31 mA
Answer» C. 4.6 mA

Discussion

2.	A 10 resistor, a 90 mH coil, and a 0.015 F capacitor are in series across an ac source. The impedance magnitude at 1,200 Hz below is
A.	1,616
B.	161
C.	3,387
D.	1,771
Answer» B. 161

Discussion

3.	In a series circuit that is operating above the resonant frequency, the current
A.	lags the applied voltage
B.	leads the applied voltage
C.	is in phase with the applied voltage
D.	is zero
Answer» B. leads the applied voltage

Discussion

4.	A 15 resistor, a 220 H coil, and a 60 pF capacitor are in series across an ac source. What is the bandwidth of the circuit?
A.	138 MHz
B.	10,866 Hz
C.	1,907 Hz
D.	138 kHz
Answer» C. 1,907 Hz

Discussion

5.	A resistor of 3 k, a 0.05 F capacitor, and a 120 mH coil are in series across a 5 kHz, 20 V ac source. What is the impedance, expressed in polar form?
A.	636
B.	3,769
C.	433
D.	4,337
Answer» E.

Discussion

6.	A 12 resistor, a 40 F capacitor, and an 8 mH coil are in series across an ac source. The resonant frequency is
A.	28.1 Hz
B.	281 Hz
C.	2,810 Hz
D.	10 kHz
Answer» C. 2,810 Hz

Discussion

7.	The impedance at the resonant frequency of a series circuit with = 20 mH, = 0.02 F, and = 90 is
A.	0
B.	90
C.	20 k
D.	40 k
Answer» C. 20 k

Discussion

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

Discussion

9.	Referring to Problem 20, what is the total parallel resistance ()?
A.	4.99
B.	499
C.	4,992
D.	6,800
Answer» D. 6,800

Discussion

10.	A 200 resistor, a coil with 30 of reactance, and a capacitor of unknown reactance are in series across an ac source. The circuit is at resonance. Circuit impedance
A.	is 230
B.	is 170
C.	is 200
D.	cannot be determined
Answer» D. cannot be determined

Discussion

11.	A 90 resistor, a coil with 30 of reactance, and a capacitor with 50 of reactance are in series across a 12 V ac source. The current through the resistor is
A.	9 mA
B.	90 mA
C.	13 mA
D.	130 mA
Answer» E.

Discussion

12.	If the value of in a series circuit is decreased, the resonant frequency
A.	is not affected
B.	increases
C.	is reduced to zero
D.	decreases
Answer» C. is reduced to zero

Discussion

13.	A 24 resistor, an inductor with a reactance of 120 , and a capacitor with a reactance of 120 are in series across a 60 V source. The circuit is at resonance. The voltage across the inductor is
A.	60 V
B.	660 V
C.	30 V
D.	300 V
Answer» E.

Discussion

14.	In a certain series resonant circuit, = 125 V, = 125 V, and = 40 V. The value of the source voltage is
A.	125 V
B.	250 V
C.	290 V
D.	40 V
Answer» E.

Discussion

15.	A certain series resonant circuit has a bandwidth of 2 kHz. If the existing coil is replaced with one having a higher value of , the bandwidth will
A.	increase
B.	remain the same
C.	decrease
D.	be less selective
Answer» D. be less selective

Discussion

16.	A 9 mH coil is in parallel with a 0.015 F capacitor across an 18 kHz ac source. The coil's internal resistance, , is 60 . The circuit impedance is
A.	17,340
B.	1,734
C.	290
D.	1,018
Answer» B. 1,734

Discussion

17.	A 15 resistor, an inductor with 8 inductive reactance, and a capacitor with 12 capacitive reactance are in parallel across an ac voltage source. The circuit impedance is
A.	12.7
B.	127
C.	4,436
D.	6,174
Answer» B. 127

Discussion

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

Discussion

19.	and have opposing effects in an circuit.
A.	True
B.	False
Answer» B. False

Discussion

20.	In a series circuit, the current is minimum at resonance.
A.	True
B.	False
Answer» C.

Discussion

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

Discussion

22.	The reactive voltages, and , cancel at resonance.
A.	True
B.	False
Answer» B. False

Discussion

23.	The quality factor () is the ratio of true power to apparent power.
A.	True
B.	False
Answer» C.

Discussion

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

Discussion

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

Discussion

26.	XL and XC have opposing effects in an RLC circuit.
A.	rue
B.	alse
Answer» B. alse

Discussion

27.	At series resonance, the inductive reactance and capacitive reactance are never equal.
A.	rue
B.	alse
Answer» C.

Discussion

28.	A series resonant circuit is commonly called a tank circuit.
A.	rue
B.	alse
Answer» C.

Discussion

29.	In a parallel RLC circuit, the smaller reactance determines the net reactance of the circuit.
A.	rue
B.	alse
Answer» B. alse

Discussion

30.	A lower Q produces a narrower bandwidth.
A.	rue
B.	alse
Answer» C.

Discussion

31.	If the value of C in a series RLC circuit is decreased, the resonant frequency increases
A.	rue
B.	alse
Answer» B. alse

Discussion

32.	The reactive voltages, VL and VC, cancel at resonance.
A.	1
B.
Answer» B.

Discussion

33.	In a series RLC circuit, the current is minimum at resonance.
A.	1
B.
C.	1
D.
Answer» C. 1

Discussion

34.	A resonant circuit has a lower critical frequency of 7 kHz and an upper critical frequency of 13 kHz. The bandwidth of the circuit is
A.	7 kHz
B.	13 kHz
C.	20 kHz
D.	6 kHz
Answer» E.

Discussion

35.	A 90 resistor, a coil with 30 of reactance, and a capacitor with 50 of reactance are in series across a 12 V ac source. The current through the resistor is
A.	9 mA
B.	90 mA
C.	13 mA
D.	130 mA
Answer» E.

Discussion

36.	In a series RLC circuit, the larger reactance determines the net reactance of the circuit.
A.	1
B.
Answer» B.

Discussion

37.	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

38.	Referring to Problem 8, the total current is
A.	1.5 A
B.	573 mA
C.	5.73 A
D.	1.19 A
Answer» D. 1.19 A

Discussion

39.	The quality factor (Q) is the ratio of true power to apparent power.
A.	1
B.
Answer» C.

Discussion

40.	A 9 mH coil is in parallel with a 0.015 F capacitor across an 18 kHz ac source. The coil's internal resistance, RW, is 60 . The circuit impedance is
A.	17340
B.	1734
C.	290
D.	1018
Answer» B. 1734

Discussion

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

Discussion

42.	A resistor of 3 k, a 0.05 F capacitor, and a 120 mH coil are in series across a 5 kHz, 20 V ac source. What is the impedance, expressed in polar form?
A.	636
B.	3769
C.	433
D.	4337
Answer» E.

Discussion

43.	A 15 resistor, a 220 H coil, and a 60 pF capacitor are in series across an ac source. What is the bandwidth of the circuit?
A.	138 MHz
B.	10,866 Hz
C.	1,907 Hz
D.	138 kHz
Answer» C. 1,907 Hz

Discussion

44.	A certain series RLC circuit with a 200 Hz, 15 V ac source has the following values: R = 12 , C = 80 F, and L = 10 mH. The total impedance, expressed in polar form, is
A.	12.2812.34¬∞
B.	12.5712.34¬∞
C.	9.9512.34¬∞
D.	12.6212.34¬∞
Answer» B. 12.5712.34¬∞

Discussion

45.	In a series RLC circuit that is operating above the resonant frequency, the current
A.	lags the applied voltage
B.	leads the applied voltage
C.	is in phase with the applied voltage
D.	is zero
Answer» B. leads the applied voltage

Discussion

46.	To tune a parallel resonant circuit to a higher frequency, the capacitance should be
A.	increased
B.	decreased
C.	left alone
D.	replaced with inductance
Answer» C. left alone

Discussion

47.	A 12 resistor, a 40 F capacitor, and an 8 mH coil are in series across an ac source. The resonant frequency is
A.	28.1 Hz
B.	281 Hz
C.	2,810 Hz
D.	10 kHz
Answer» C. 2,810 Hz

Discussion

48.	If the resistance in parallel with a parallel resonant circuit is reduced, the bandwidth
A.	disappears
B.	becomes sharper
C.	increases
D.	decreases
Answer» E.

Discussion

49.	Resonance is a condition in a series RLC circuit in which the capacitive and inductive reactances are equal in magnitude.
A.	1
B.
C.	1
D.
Answer» B.

Discussion

50.	A 10 resistor, a 90 mH coil, and a 0.015 F capacitor are in series across an ac source. The impedance magnitude at 1,200 Hz below fr is
A.	1616
B.	161
C.	3387
D.	1771
Answer» B. 161

Discussion

Explore topic-wise MCQs in Electrical Engineering.

Referring to Problem 10, the total current is

A 10 resistor, a 90 mH coil, and a 0.015 F capacitor are in series across an ac source. The impedance magnitude at 1,200 Hz below is

In a series circuit that is operating above the resonant frequency, the current

A 15 resistor, a 220 H coil, and a 60 pF capacitor are in series across an ac source. What is the bandwidth of the circuit?

A resistor of 3 k, a 0.05 F capacitor, and a 120 mH coil are in series across a 5 kHz, 20 V ac source. What is the impedance, expressed in polar form?

A 12 resistor, a 40 F capacitor, and an 8 mH coil are in series across an ac source. The resonant frequency is

The impedance at the resonant frequency of a series circuit with = 20 mH, = 0.02 F, and = 90 is

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

Referring to Problem 20, what is the total parallel resistance ()?

A 200 resistor, a coil with 30 of reactance, and a capacitor of unknown reactance are in series across an ac source. The circuit is at resonance. Circuit impedance

A 90 resistor, a coil with 30 of reactance, and a capacitor with 50 of reactance are in series across a 12 V ac source. The current through the resistor is

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

A 24 resistor, an inductor with a reactance of 120 , and a capacitor with a reactance of 120 are in series across a 60 V source. The circuit is at resonance. The voltage across the inductor is

In a certain series resonant circuit, = 125 V, = 125 V, and = 40 V. The value of the source voltage 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 , the bandwidth will

A 9 mH coil is in parallel with a 0.015 F capacitor across an 18 kHz ac source. The coil's internal resistance, , is 60 . The circuit impedance is

A 15 resistor, an inductor with 8 inductive reactance, and a capacitor with 12 capacitive reactance are in parallel across an ac voltage source. The circuit impedance is

A lower produces a narrower bandwidth.

and have opposing effects in an circuit.

In a series circuit, the current is minimum at resonance.

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

The reactive voltages, and , cancel at resonance.

The quality factor () is the ratio of true power to apparent power.

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

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

XL and XC have opposing effects in an RLC circuit.

At series resonance, the inductive reactance and capacitive reactance are never equal.

A series resonant circuit is commonly called a tank circuit.

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

A lower Q produces a narrower bandwidth.

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

The reactive voltages, VL and VC, cancel at resonance.

In a series RLC circuit, the current is minimum at resonance.

A resonant circuit has a lower critical frequency of 7 kHz and an upper critical frequency of 13 kHz. The bandwidth of the circuit is

A 90 resistor, a coil with 30 of reactance, and a capacitor with 50 of reactance are in series across a 12 V ac source. The current through the resistor is

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

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

Referring to Problem 8, the total current is

The quality factor (Q) is the ratio of true power to apparent power.

A 9 mH coil is in parallel with a 0.015 F capacitor across an 18 kHz ac source. The coil's internal resistance, RW, is 60 . The circuit impedance is

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

A resistor of 3 k, a 0.05 F capacitor, and a 120 mH coil are in series across a 5 kHz, 20 V ac source. What is the impedance, expressed in polar form?

A 15 resistor, a 220 H coil, and a 60 pF capacitor are in series across an ac source. What is the bandwidth of the circuit?

A certain series RLC circuit with a 200 Hz, 15 V ac source has the following values: R = 12 , C = 80 F, and L = 10 mH. The total impedance, expressed in polar form, is

In a series RLC circuit that is operating above the resonant frequency, the current

To tune a parallel resonant circuit to a higher frequency, the capacitance should be

A 12 resistor, a 40 F capacitor, and an 8 mH coil are in series across an ac source. The resonant frequency is

If the resistance in parallel with a parallel resonant circuit is reduced, the bandwidth

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

A 10 resistor, a 90 mH coil, and a 0.015 F capacitor are in series across an ac source. The impedance magnitude at 1,200 Hz below fr is