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Resonance MCQs | Resonance Multiple Choice Questions and Answers

(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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