Resonance MCQs | Resonance Multiple Choice Questions and Answers

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Questions
1 The circuit is said to be in resonance if the current is ____ with the applied voltage.
A In Phase
B 90⁰ Out Of Phase
C Out Of Phase
D 45⁰ Out Of Phase

Answer: In Phase
2 At resonant frequency, the voltage across capacitor is _______ the voltage across inductor.
A greater than or equal to
B greater than
C equal to
D less than

Answer: equal to
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3 The expression of resonant frequency in a series resonant circuit is?
A 1/(2π√LC)
B 1/(2π√C)
C 1/( 2π√L)
D 2π√LC

Answer: 1/(2π√LC)
4 What would be the value of impedance of a parallel resonant circuit at antiresonance condition?
A Resistive & maximum
B Reactive & maximum
C Resistive & minimum
D Reactive & minimum

Answer: Resistive & maximum
5 If an a.c. signal generator drives a series RLC circuit, then the circuit undergoes resonance only due to variation in __________
A Supply voltage
B Series resistance
C Phase angle
D Supply frequency

Answer: Supply frequency
6 A 24 Ω resistor, an inductor with a reactance of 120 Ω, and a capacitor with a reactance of 120 Ω are in series across a 60 V source. The circuit is at resonance. The voltage across the inductor is
A 300 V
B 60 V
C 660 V
D None of these

Answer: 300 V
7 In a series RLC circuit that is operating above the resonant frequency, the current
A Is in phase with the applied voltage
B Leads the applied voltage
C Lags the applied voltage
D None of these

Answer: Lags the applied voltage
8 If the value of C in a series RLC circuit is decreased, the resonant frequency
A Increases
B Is not affected
C Is reduced to zero
D None of these

Answer: Increases
9 If the resistance in parallel with a parallel resonant circuit is reduced, the bandwidth
A Decreases
B Increases
C Disappears
D Becomes sharper

Answer: Decreases
10 To tune a parallel resonant circuit to a higher frequency, the capacitance should be
A Decreased
B Increased
C Left alone
D Replaced with inductance

Answer: Decreased
11 Which among the following get/s cancelled under the resonance condition in a.c. circuits, if inductive and capacitive reactances are in parallel?
A Susceptance
B Resistance
C Reactance
D All of the above

Answer: Susceptance
12 Reactance curve is basically a graph of individual reactances verses __________
A Time period
B Phase
C Frequency
D Amplitude

Answer: Frequency
13 How do the series resonant circuit behave under the resonance condition?
A Voltage amplifier
B Voltage regulator
C Current amplifier
D None of these

Answer: Voltage amplifier
14 The current leads supply voltage if a series resonant circuit exhibits its operation__________ the resonant frequency
A Below
B Equal to
C Above
D None of these

Answer: Below
15 What will be the nature of impedance at a frequency below the antiresonant frequency?
A Inductive
B Reactive
C Capacitive
D None of these

Answer: Inductive
16 As XL = XC in a series resonance circuit, the impedance is_________
A purely resistive
B capacitive and inductive
C purely capacitive
D purely inductive

Answer: purely resistive
17 In a series resonance circuit, series resonance occurs when?
A XL = XC
B XL = -XC
C XL = 1
D XC = 1

Answer: XL = XC
18 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 90 Ω
B 20 Ω
C 0 Ω
D None Of These

Answer: 90 Ω
19 If the value of resonant frequency is 50 kHz in a series RLC circuit along with the bandwidth of about 1 kHz, then what would be the value of quality factor?
A 100
B 106
C 114
D 50

Answer: 50
20 The voltage across the LC combination in a series RLC circuit is?
A 3
B 6
C 0
D None

Answer: 0

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