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Resonance MCQs | Resonance Multiple Choice Questions and Answers

Free download in PDF Resonance Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
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(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
(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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