AC Bridge Question & Answers June 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 Hint 2). The Q factor of an AC bridge is given by ________________? Q = R/X Q = X/R Q = R/(2πfL) Q = (2πfL)/R Hint 3). 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 Hint 4). The phase angle between the current and voltage in a balanced AC bridge is ______________________? 0 degrees 45 degrees 90 degrees 180 degrees Hint 5). The Kelvin bridge is used for measuring ______________________? Inductance Resistance Capacitance Conductance Hint 6). In an AC bridge circuit, the condition for balanced bridge is ___________________? R₁R₂ = R₃R₄ R₁R₂C₁C₂ = L₁L₂ R₁C₁ = R₂C₂ R₃R₄ = L₁L₂ Hint 7). The condition for a balanced Wien bridge is ___________________? R₁C₁ = R₂C₂ R₁R₂C₁C₂ = L₁L₂ R₁R₂ = R₃R₄ R₃R₄ = L₁L₂ Hint 8). The Q factor of an AC circuit is a measure of its __________________? Resistance Reactance Power factor Selectivity Hint 9). 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 Hint 10). The Q factor is commonly used to quantify the efficiency of ___________________? Inductors Capacitors Transformers Filters Hint 11). A high Q factor indicates _________________? High power loss High bandwidth Low selectivity Low power factor Hint 12). 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 Hint 13). 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 Hint 14). The Q factor of an inductor is mainly determined by its __________________? Resistance Inductance Capacitance Frequency Hint 15). The Q factor of a capacitor is mainly determined by its ____________________? Resistance Inductance Capacitance Frequency Hint 16). The Q factor of an inductor increases with ___________________? Decreasing resistance Decreasing inductance Increasing capacitance Increasing frequency Hint 17). The Q factor of a capacitor increases with __________________? Decreasing resistance Decreasing capacitance Increasing inductance Increasing frequency Hint 18). The Q factor of a resonant circuit is maximum at _________________? The resonant frequency Frequencies below resonance The anti-resonant frequency Frequencies above resonance Hint 19). The Q factor of an AC bridge can be determined by using _________________? Schering bridge Maxwell bridge Hay bridge Wien bridge Hint 20). 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 Hint 21). A high Q factor in an AC bridge indicates ____________________? High accuracy in impedance measurement High power dissipation Low selectivity Low voltage amplification Hint 22). Q factor is a measure of ___________________? Resistance Inductance Capacitance Quality of resonance Hint 23). Q factor is defined as the ratio of _________________? Reactance to resistance Resistance to reactance Resistance to impedance Impedance to resistance Hint 24). The higher the Q factor, the __________ the resonance? Narrower Wider Stronger Weaker Hint 25). Q factor is also known as __________________? Quality factor Resonance factor Reactance factor Power factor 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 Hint 27). 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 Hint 28). A higher Q factor indicates _______________? Higher power loss Lower power loss No power loss Power gain Hint 29). The Q factor of a series resonant circuit depends on __________________? Resistance only Inductance only Capacitance only Both resistance and reactance Hint 30). The Q factor of a parallel resonant circuit depends on _____________________? Resistance only Inductance only Capacitance only Both resistance and reactance Hint 31). In an AC bridge, the Q factor can be adjusted by varying the ____________________? Resistance Inductance Capacitance All of the above Hint 32). The Q factor of an ideal inductor is ___________________? Zero Infinite One Cannot be determined Hint 33). The Q factor of an ideal capacitor is ____________________? Zero Infinite One Cannot be determined Hint 34). In an AC bridge, the Q factor is maximum when __________________? Reactance is maximum Reactance is minimum Resistance is maximum Resistance is minimum Hint 35). The Q factor can be used to determine the ________ of a resonant circuit. Bandwidth Frequency Power factor Voltage Hint 36). A higher Q factor corresponds to a _________ bandwidth? Narrower Wider Constant Variable Hint 37). 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 Hint 38). 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 Hint 39). 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 Hint 40). Who is credited with the invention of the first AC bridge? Gustav Kirchhoff William Thomson (Lord Kelvin) Charles Wheatstone Oliver Heaviside Hint 41). The concept of AC bridge circuits was developed in the ________________? 18th century 19th century 20th century 21st century Hint 42). The Kelvin bridge, a variant of the Wheatstone bridge, was developed by ____________________? William Thomson (Lord Kelvin) Charles Wheatstone Max Planck Albert Einstein Hint 43). The AC bridge circuit was originally developed for the measurement of _______________? Inductance Capacitance Resistance Power factor Hint 44). The Maxwell bridge, an AC bridge circuit, was introduced by ____________________? James Clerk Maxwell Michael Faraday Heinrich Hertz Joseph Henry Hint 45). The Wien bridge, another variant of the AC bridge, was developed by ________________? Charles Wheatstone Max Wien William Thomson (Lord Kelvin) Oliver Heaviside Hint 46). The concept of Q factor in AC bridges was introduced by _____________________? Gustav Kirchhoff Max Planck Joseph Henry Karl Braun Hint 47). The AC bridge technology gained significant prominence during the ___________________? Industrial Revolution Renaissance Scientific Revolution Hint 48). The development of AC bridges was closely tied to the advancements in __________________? Telecommunications Power generation and distribution Electronics Computing Hint 49). AC bridge circuits continue to be widely used today in various fields, including ___________________? Telecommunications Electronics Power systems All of the above Hint 50). AC bridges played a crucial role in the development of ______________________? Power distribution systems Radio technology Electric motors Semiconductor devices Hint Time's up