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51.	At resonance condition, the voltage across the capacitor and inductor is _________ the source voltage.(a) Greater than(b) Less than(c) Equal to(d) Much less thanI got this question in my homework.My enquiry is from Quality Factor in chapter Resonance in AC Circuits of Basic Electrical Engineering
Answer» The correct answer is (a) GREATER than For explanation: In RESONANCE condition, the VOLTAGE across the capacitor and inductor is greater than the source voltage because the voltage across the capacitor or inductor in resonance condition is EQUAL to Q times the source voltage.

52.	The current in the capacitor ___________ the voltage in a series RLC circuit below the resonant frequency.(a) Leads(b) Lags(c) Equal to(d) Depends on the circuitI have been asked this question during an internship interview.The origin of the question is Voltages in a Series RLC Circuit topic in division Resonance in AC Circuits of Basic Electrical Engineering
Answer» CORRECT answer is (a) Leads For explanation: ω < ω0 => ω < 1/√LC => ωL < 1/ωC=>XL < XCThe circuit is capacitive DOMINANT so, the current in the CAPACITOR leads the voltage in a series RLC circuit above the resonant frequency.

53.	In a series RLC circuit, the phase difference between the voltage across the capacitor and the voltage across the resistor is?(a) 0^0(b) 90^0(c) 180^0(d) 360^0This question was addressed to me in quiz.My question is from Voltages in a Series RLC Circuit topic in portion Resonance in AC Circuits of Basic Electrical Engineering
Answer» RIGHT ANSWER is (b) 90^0 Explanation: In a series RLC circuit, VOLTAGE across capacitor LAG the current by 90^0 and voltage across resistor is in phase with current so, the phase difference between the voltage across the capacitor and the voltage across the resistor is 90^0.

54.	What happens to the quality factor when resonant frequency increases?(a) Increases(b) Decreases(c) Remains the same(d) Becomes zeroI got this question in class test.This interesting question is from Frequency Variation in a Series RLC Circuit topic in division Resonance in AC Circuits of Basic Electrical Engineering
Answer» CORRECT ANSWER is (a) INCREASES To explain I would say: Q=fres/Bandwidth Quality factor is directly proportional to RESONANT FREQUENCY. So, if resonant frequency increases quality factor increases.

55.	In a series RLC circuit, the phase difference between the current in the inductor and the current in the resistor is?(a) 0^0(b) 90^0(c) 180^0(d) 360^0I had been asked this question in my homework.Question is from The Current in a Series RLC Circuit in chapter Resonance in AC Circuits of Basic Electrical Engineering
Answer» Correct answer is (a) 0^0 For explanation: In a SERIES RLC circuit, the phase difference between the current in the inductor and the current in the RESISTOR is 0^0 because same current flows in the inductor as well as the resistor.

56.	At resonance, electrostatic energy is ___________ the magnetic energy.(a) Greater than(b) Less than(c) Equal to(d) Depends on the circuitThe question was posed to me in final exam.My question comes from Oscillation of Energy at Resonance in chapter Resonance in AC Circuits of Basic Electrical Engineering
Answer» Right choice is (c) Equal to To explain I would SAY: At RESONANCE, energy STORED in the CAPACITOR is equal to energy stored in the inductor because CAPACITIVE reactance and inductive reactance are equal at resonance.The capacitor stores electrostatic energy and the inductor stores magnetic energy hence they are equal.

57.	The current in the inductor lags the voltage in a series RLC circuit ___________ resonant frequency.(a) Above(b) Below(c) Equal to(d) Depends on the circuitThis question was posed to me in examination.This interesting question is from Voltages in a Series RLC Circuit topic in portion Resonance in AC Circuits of Basic Electrical Engineering
Answer» CORRECT answer is (a) Above To explain I would say: The CURRENT in the INDUCTOR LAGS the voltage in a series RLC circuit if circuit is inductive dominant i.e. if XL > XCωL > 1/ωC=> ω > 1/√LC=> ω > ω0.So, the current in the inductor lags the voltage in a series RLC circuit above the RESONANT frequency.

58.	The current leads the supply voltage in a series RLC circuit has its frequency _________ the resonant frequency.(a) Above(b) Below(c) Equal to(d) Cannot be determinedThe question was asked by my college professor while I was bunking the class.My question comes from Frequency Variation in a Series RLC Circuit in section Resonance in AC Circuits of Basic Electrical Engineering
Answer» Right CHOICE is (b) Below Explanation: CURRENT is leading the voltage indicates capacitor dominating circuit.XC>XL => 1/(ωC) > ωL=> ω<1/√LC So, frequency less than resonant frequency.

59.	What happens to the voltage across the inductor when the Q factor decreases?(a) Increases(b) Decreases(c) Remains the same(d) Becomes zeroI got this question during an interview.My question is based upon Quality Factor topic in division Resonance in AC Circuits of Basic Electrical Engineering
Answer» The CORRECT option is (b) Decreases For explanation: We know that voltage across the INDUCTOR in resonance CONDITION is equal to Q times the source voltage. HENCE as the Q FACTOR decreases, the voltage across the inductor also decreases.

60.	Current is maximum at __________ frequency of bandwidth.(a) left end(b) middle(c) right end(d) all endI had been asked this question during a job interview.I want to ask this question from Bandwidth topic in section Resonance in AC Circuits of Basic Electrical Engineering
Answer» Correct answer is (b) middle The BEST I can explain: CURRENT will be maximum at a frequency which is at the middle of bandwidth. On both sides, it DECREASES and is 1/√2 TIMES the maximum current at the ends of bandwidth.

61.	In a series RLC circuit, the phase difference between the voltage across the inductor and the current in the circuit is?(a) 0^0(b) 90^0(c) 180^0(d) 360^0The question was posed to me in examination.I want to ask this question from Voltages in a Series RLC Circuit topic in section Resonance in AC Circuits of Basic Electrical Engineering
Answer» The CORRECT choice is (b) 90^0 Explanation: In a SERIES RLC CIRCUIT, voltage across inductor LEAD the current by 90^0 so, the phase difference between the voltage across the inductor and the current is 90^0.

62.	Find the source voltage when the voltage across the capacitor is 1000V and the Q factor is 10.(a) 10V(b) 200V(c) 100V(d) 90VI have been asked this question in an online interview.Question is taken from Quality Factor in chapter Resonance in AC Circuits of Basic Electrical Engineering
Answer» The correct option is (c) 100V To explain I would say: We know that voltage ACROSS the capacitor in RESONANCE condition is equal to Q times the SOURCE voltage. Q=VC/VSwhere VC is CAPACITIVE voltage and VS is source voltage.10=1000/VS VS=100 V.

63.	What is the correct formula for quality factor?(a) Q=BW*fr(b) Q=BW/fr(c) Q=fr/BW(d) Q=fr2I had been asked this question by my college director while I was bunking the class.This key question is from Frequency Variation in a Series RLC Circuit topic in portion Resonance in AC Circuits of Basic Electrical Engineering
Answer» Right choice is (c) Q=fr/BW The explanation is: The CORRECT formula for QUALITY factor is Q=fr/BW, where fr is the resonant frequency, BW is the bandwidth frequency and Q is the quality factor.