AC Bridge Question & AnswersJune 20, 2023 By Wat Electrical This article lists 50 AC bridge MCQs for engineering students. All the AC bridge Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of AC bridge.An AC bridge, also known as an alternating current bridge, is a type of electrical circuit commonly used for measuring unknown electrical quantities. It operates on the principle of comparing the unknown component with known standard components. The basic AC bridge configuration consists of four arms, typically represented as four branches of a Wheatstone bridge. These arms can contain resistors, inductors, and capacitors, depending on the type of bridge and the measurement being performed.The AC bridge operates by applying an alternating current (AC) voltage or current to the bridge circuit and measuring the resulting voltages or currents across the different arms. By adjusting the values of the known components in the bridge, the bridge can be balanced, meaning that the voltages or currents in certain arms become zero or null.When the bridge is balanced, it indicates that the unknown component has the same impedance or value as the known standard component. By measuring the values of the known components at balance, the unknown component's value can be determined. 1). In a Wheatstone bridge, the unknown resistance is connected in which arm of the bridge? Adjacent arm Opposite arm Adjacent diagonal Opposite diagonal None Hint2). The Q factor of an AC bridge is given by ________________? Q = R/X Q = X/R Q = R/(2πfL) Q = (2πfL)/R None Hint3). What is the condition for a balanced AC bridge? Resistance ratios are equal Capacitance ratios are equal Inductance ratios are equal Impedance ratios are equal None Hint4). The phase angle between the current and voltage in a balanced AC bridge is ______________________? 0 degrees 45 degrees 90 degrees 180 degrees None Hint5). The Kelvin bridge is used for measuring ______________________? Inductance Resistance Capacitance Conductance None Hint6). In an AC bridge circuit, the condition for balanced bridge is ___________________? R₁R₂ = R₃R₄ R₁R₂C₁C₂ = L₁L₂ R₁C₁ = R₂C₂ R₃R₄ = L₁L₂ None Hint7). The condition for a balanced Wien bridge is ___________________? R₁C₁ = R₂C₂ R₁R₂C₁C₂ = L₁L₂ R₁R₂ = R₃R₄ R₃R₄ = L₁L₂ None Hint8). The Q factor of an AC circuit is a measure of its __________________? Resistance Reactance Power factor Selectivity None Hint9). The Q factor is defined as the ratio of __________________? Reactive power to real power Inductive reactance to capacitive reactance Resonant frequency to bandwidth Voltage to current None Hint10). The Q factor is commonly used to quantify the efficiency of ___________________? Inductors Capacitors Transformers Filters None Hint11). A high Q factor indicates _________________? High power loss High bandwidth Low selectivity Low power factor None Hint12). The Q factor of a series RLC circuit can be calculated as __________________? R divided by L L divided by R R divided by C C divided by R None Hint13). The Q factor of a parallel RLC circuit can be calculated as ________________? R divided by L L divided by R R divided by C C divided by R None Hint14). The Q factor of an inductor is mainly determined by its __________________? Resistance Inductance Capacitance Frequency None Hint15). The Q factor of a capacitor is mainly determined by its ____________________? Resistance Inductance Capacitance Frequency None Hint16). The Q factor of an inductor increases with ___________________? Decreasing resistance Decreasing inductance Increasing capacitance Increasing frequency None Hint17). The Q factor of a capacitor increases with __________________? Decreasing resistance Decreasing capacitance Increasing inductance Increasing frequency None Hint18). The Q factor of a resonant circuit is maximum at _________________? The resonant frequency Frequencies below resonance The anti-resonant frequency Frequencies above resonance None Hint19). The Q factor of an AC bridge can be determined by using _________________? Schering bridge Maxwell bridge Hay bridge Wien bridge None Hint20). The Q factor of a resonant circuit is equal to _____________________? 1 divided by the power factor 1 divided by the impedance The square root of the power factor The square root of the impedance None Hint21). A high Q factor in an AC bridge indicates ____________________? High accuracy in impedance measurement High power dissipation Low selectivity Low voltage amplification None Hint22). Q factor is a measure of ___________________? Resistance Inductance Capacitance Quality of resonance None Hint23). Q factor is defined as the ratio of _________________? Reactance to resistance Resistance to reactance Resistance to impedance Impedance to resistance None Hint24). The higher the Q factor, the __________ the resonance? Narrower Wider Stronger Weaker None Hint25). Q factor is also known as __________________? Quality factor Resonance factor Reactance factor Power factor None Hint AC bridge MCQ for Quiz 26). The Q factor is mathematically represented as ________________? Q = XL / XC Q = XC / XL Q = XL – XC Q = XC – XL None Hint27). In an AC bridge circuit, the Q factor is calculated using the _____________________? Resistance and reactance values Capacitance and reactance values Resistance and impedance values Impedance and reactance values None Hint28). A higher Q factor indicates _______________? Higher power loss Lower power loss No power loss Power gain None Hint29). The Q factor of a series resonant circuit depends on __________________? Resistance only Inductance only Capacitance only Both resistance and reactance None Hint30). The Q factor of a parallel resonant circuit depends on _____________________? Resistance only Inductance only Capacitance only Both resistance and reactance None Hint31). In an AC bridge, the Q factor can be adjusted by varying the ____________________? Resistance Inductance Capacitance All of the above None Hint32). The Q factor of an ideal inductor is ___________________? Zero Infinite One Cannot be determined None Hint33). The Q factor of an ideal capacitor is ____________________? Zero Infinite One Cannot be determined None Hint34). In an AC bridge, the Q factor is maximum when __________________? Reactance is maximum Reactance is minimum Resistance is maximum Resistance is minimum None Hint35). The Q factor can be used to determine the ________ of a resonant circuit. Bandwidth Frequency Power factor Voltage None Hint36). A higher Q factor corresponds to a _________ bandwidth? Narrower Wider Constant Variable None Hint37). What is the type of Q factor that determines the stability and sensitivity of an AC bridge measurement? Sensitivity Q factor Energy Q factor Measurement Q factor None of the above None Hint38). Which type of Q factor is associated with the energy storage and release efficiency of an AC bridge circuit? Sensitivity Q factor Energy Q factor Measurement Q factor None of the above None Hint39). Which type of Q factor characterizes the efficiency of an AC bridge in measuring unknown impedance? Energy Q factor Sensitivity Q factor Measurement Q factor None of the above None Hint40). Who is credited with the invention of the first AC bridge? Gustav Kirchhoff William Thomson (Lord Kelvin) Charles Wheatstone Oliver Heaviside None Hint41). The concept of AC bridge circuits was developed in the ________________? 18th century 19th century 20th century 21st century None Hint42). The Kelvin bridge, a variant of the Wheatstone bridge, was developed by ____________________? William Thomson (Lord Kelvin) Charles Wheatstone Max Planck Albert Einstein None Hint43). The AC bridge circuit was originally developed for the measurement of _______________? Inductance Capacitance Resistance Power factor None Hint44). The Maxwell bridge, an AC bridge circuit, was introduced by ____________________? James Clerk Maxwell Michael Faraday Heinrich Hertz Joseph Henry None Hint45). The Wien bridge, another variant of the AC bridge, was developed by ________________? Charles Wheatstone Max Wien William Thomson (Lord Kelvin) Oliver Heaviside None Hint46). The concept of Q factor in AC bridges was introduced by _____________________? Gustav Kirchhoff Max Planck Joseph Henry Karl Braun None Hint47). The AC bridge technology gained significant prominence during the ___________________? Industrial Revolution Renaissance Scientific Revolution None Hint48). The development of AC bridges was closely tied to the advancements in __________________? Telecommunications Power generation and distribution Electronics Computing None Hint49). AC bridge circuits continue to be widely used today in various fields, including ___________________? Telecommunications Electronics Power systems All of the above None Hint50). AC bridges played a crucial role in the development of ______________________? Power distribution systems Radio technology Electric motors Semiconductor devices None Hint Time's up
