Parallel Resonance Question & Answers May 10, 2023 By Wat Electrical This article lists 25 Parallel Resonance MCQs for engineering students. All the Parallel Resonance Questions & Answers below include a hint and a link to the relevant topic wherever possible. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of Parallel Resonance. Parallel resonance is a phenomenon that occurs when an AC circuit containing a capacitor and an inductor reaches a state where the current flowing through the circuit is at its maximum value while the voltage across the circuit is at its minimum value. This state is known as the resonance frequency of the circuit. In a parallel resonance circuit, the capacitor and inductor are connected in parallel with each other. At resonance, the capacitive reactance (Xc) and the inductive reactance (Xl) are equal and opposite, canceling each other out. This results in the circuit impedance being at its minimum value, allowing maximum current to flow through the circuit. Parallel resonance is used in a variety of electrical and electronic applications, such as in radio receivers, where it is used to select a specific frequency from a range of incoming signals. It is also used in power factor correction circuits, where it is used to improve the efficiency of electrical power distribution systems. Parallel resonance can be observed in many practical applications such as in radio frequency (RF) circuits, audio filters, and power electronics. It is also used in the design of electric circuits such as crystal oscillators and tank circuits for tuning in radio receivers. 1). What happens to the current in a parallel resonance circuit at resonance? It is at its minimum value It is at its maximum value It is zero None of the above Hint 2). What happens to the voltage in a parallel resonance circuit at resonance? It is at its minimum value It is at its maximum value It is zero None of the above Hint Read more about Inductive Reactance 3). What happens to the impedance of a parallel resonance circuit at resonance? It is at its minimum value It is at its maximum value It is zero It is infinity Hint 4). What happens to the power factor of a parallel resonance circuit at resonance? It is at its maximum value It is infinity It is at its minimum value It is zero Hint 5). How is the resonance frequency of a parallel resonance circuit affected by changes in the capacitance or inductance? It increases It decreases It remains the same None of the above Hint 6). In a parallel resonance circuit, what happens if the frequency of the applied voltage is higher than the resonance frequency? The impedance of the circuit decreases The impedance of the circuit increases The current in the circuit decreases Both a and c Hint 7). What factor determines the resonance frequency of a parallel resonance circuit? Resistance Capacitance Inductance Transistor Hint 8). How does increasing the capacitance affect the resonance frequency of a parallel resonance circuit? It increases It decreases It remains the same Either increase or decreases Hint 9). How does increasing the inductance affect the resonance frequency of a parallel resonance circuit? It increases It decreases It remains the same None of the above Hint 10). How does increasing the resistance affect the bandwidth of a parallel resonance circuit? It increases It decreases It remains the same It either increases or decreases Hint Parallel Resonance MCQ for Quiz 11). What is the Q factor of a parallel resonance circuit? The ratio of the resistance to the inductance The ratio of the resistance to the capacitance The ratio of the reactance to the resistance None of the above Hint 12). What is the formula for the resonance frequency of a parallel resonance circuit? f = 1/(2π√LC) f = 1/(2πRC) f = 1/(2π√L/C) f = 1/2LC Hint 13). What is the formula for the impedance of a parallel resonance circuit at resonance? Z = R Z = 1/(ωC) Z = √(R^2 + (1/ωC – ωL)^2) Z=WC Hint 14). What is the formula for the current in a parallel resonance circuit at resonance? I = V/R I = V/(ωL) I = V/(1/ωC) Z=R Hint 15). What is the formula for the power factor of a parallel resonance circuit? cos(θ) = R/Z cos(θ) = Z/R cos(θ) = ωL/R cos(θ) = RZ Hint 16). What is the formula for the Q factor of a parallel resonance circuit? Q = R/ωL Q = ωL/R Q = 1/(ωC*Rd) Q=RL Hint 17). Who first discovered the phenomenon of resonance? Nikola Tesla Michael Faraday Heinrich Hertz Edison Hint 18). Who first discovered the phenomenon of parallel resonance? Joseph Henry James Clerk Maxwell Oliver Heaviside Michael Faraday Hint 19). When was the phenomenon of parallel resonance first discovered? Early 19th century Mid-19th century Late 19th century Early 18th century Hint 20). Who first developed a mathematical model for parallel resonance? James Clerk Maxwell Oliver Heaviside Joseph Henry Michael Faraday Hint Parallel Resonance MCQ for Exams 21). When was the mathematical model for parallel resonance first developed? Early 19th century Mid-19th century Late 19th century Early 18th century Hint 22). What is the resonance frequency of a parallel resonance circuit with a capacitance of 10 nF and an inductance of 100 μH? 1.59 MHz 15.9 MHz 159 kHz 120 KHz Hint 23). What is the impedance of a parallel resonance circuit at resonance with a capacitance of 10 nF and an inductance of 100 μH? 6.28 Ω 628 Ω 6.28 kΩ 6 Ω Hint 24). What is the current in a parallel resonance circuit at resonance with a capacitance of 10 nF and an inductance of 100 μH if the voltage across the circuit is 10 V? 628 mA 1.01 A 62.8 mA 2.1 mA Hint 25). What is the power factor of a parallel resonance circuit with a resistance of 100 Ω, a capacitance of 10 nF, and an inductance of 100 μH at resonance? 0.707 0.5 0.866 1 Hint Time's up