Wheatstone Bridge Question & Answers May 24, 2023 By Wat Electrical This article lists 50 Wheatstone Bridge MCQs for engineering students. All the Wheatstone 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 Wheatstone Bridge. Wheatstone bridge is a circuit based configuration used for measuring electrical resistance, was live in 1833 by Samuel Hunter Christie. The bridge consists of a network of four resistive arms, with a galvanometer connected between two junction points. The bridge consists of four resistors connected in a diamond shape, with two resistors forming one side and the other two forming the opposite side. The input voltage (known as the excitation voltage) is applied across one diagonal of the bridge. The galvanometer is connected to the other diagonal of the bridge. The resistances in the arms of the bridge can be adjusted to achieve a balanced condition, where the galvanometer shows zero deflection. When the bridge is balanced, the ratio of the resistances in one arm is equal to the ratio of the resistances in the other arm. Overall, the Wheatstone bridge is a versatile circuit configuration used for accurate resistance measurements and various other applications in scientific, industrial, and engineering fields. 1). In a Wheatstone bridge, which component is responsible for measuring the unknown resistance? Galvanometer Rheostat Power supply Known resistance Hint 2). A Wheatstone bridge is primarily used to measure ___________________? Voltage Current Resistance Power Hint 3). In a balanced Wheatstone bridge, the potential difference across the galvanometer is ____________________? Zero Maximum Minimum Indeterminate Hint 4). What condition must be satisfied for a Wheatstone bridge to be balanced? The ratio of resistances in the two arms must be equal. The ratio of resistances in the two arms must be different. The ratio of resistances in the two arms must be zero. The ratio of resistances in the two arms must be infinity. Hint 5). Which of the following is true for a balanced Wheatstone bridge? The bridge is short-circuited. The bridge is open-circuited. The bridge is neither short-circuited nor open-circuited The bridge cannot be balanced Hint 6). What happens to the galvanometer reading when a Wheatstone bridge is balanced? It shows a maximum deflection It shows a minimum deflection It shows no deflection It shows random deflections Hint 7). What is the formula for calculating the unknown resistance in a Wheatstone bridge? R = R1 × R2 ÷ (R3 × R4) R = R1 + R2 + R3 + R4 R = R1 - R2 + R3 - R4 R = R1 × R2 + R3 × R4 Hint 8). The sensitivity of a Wheatstone bridge can be increased by ____________________? Increasing the value of the known resistance. Decreasing the value of the known resistance. Increasing the value of the unknown resistance Decreasing the value of the unknown resistance. Hint 9). Which of the following factors can affect the accuracy of a Wheatstone bridge measurement? Temperature variations Humidity variations Stray capacitance All of the above Hint 10). A Wheatstone bridge can be used to measure ___________________? Temperature Pressure Strain All of the above Hint 11). Which scientist is credited with the invention of the Wheatstone bridge? Thomas Edison Samuel Morse Charles Wheatstone Michael Faraday Hint 12). What happens if one of the resistors in a Wheatstone bridge is replaced by a capacitor? The bridge becomes unbalanced The bridge remains balanced The galvanometer shows a maximum deflection The galvanometer shows no deflection Hint 13). If the ratio of resistances in the Wheatstone bridge is 1:2:3:4, what will be the value of the unknown resistance if the bridge is balanced? 1Ω 2Ω 3Ω 4Ω Hint 14). A Wheatstone bridge has resistances of 100 Ω, 200 Ω, and 300 Ω in three arms. What is the value of the unknown resistance if the bridge is balanced? 100 Ω 200 Ω 300 Ω 400 Ω Hint 15). In a Wheatstone bridge, the ratio of resistances in one arm is 2:3. If the bridge is balanced, what is the ratio of the other arm’s resistances? 1:2 2:3 3:2 3:1 Hint 16). If a Wheatstone bridge is balanced and has a known resistance of 100 Ω in one arm, and the ratio of resistances in the other arm is 3:5, what is the value of the unknown resistance? 250 Ω 300 Ω 400 Ω 500 Ω Hint 17). If the known resistances in a Wheatstone bridge are 50 Ω and 100 Ω, and the bridge is balanced, what is the equivalent resistance of the unknown resistance? 25 Ω 50 Ω 100 Ω 200 Ω Hint 18). A Wheatstone bridge has resistors with values of R1 = 100 Ω, R2 = 200 Ω, R3 = 300 Ω, and R4 = 400 Ω. What is the value of the unknown resistance if the bridge is balanced? 200 Ω 300 Ω 400 Ω 500 Ω Hint 19).A Wheatstone bridge circuit consists of a 10 Ω known resistor and a 20 Ω unknown resistor. If the bridge is balanced, what is the value of the unknown resistor? 10 Ω 20 Ω 30 Ω 40 Ω Hint 20). In a Wheatstone bridge circuit, the ratio of resistances is 2:1:4:3. If the known resistance is 20 Ω, what is the value of the unknown resistance when the bridge is balanced? 5 Ω 10 Ω 20 Ω 40 Ω Hint 21). In what year was the Wheatstone bridge invented? 1802 1833 1864 1899 Hint 22). Charles Wheatstone was a prominent scientist and inventor from which country? England France Germany United States Hint 23). What was the original purpose of the Wheatstone bridge when it was invented? Measurement of resistance Measurement of temperature Communication system Power generation Hint 24). Charles Wheatstone's invention of the Wheatstone bridge was a significant contribution to which field? Physics Chemistry Electrical engineering Medicine Hint 25). Who were the collaborators in the development of the Wheatstone bridge? Charles Wheatstone and Michael Faraday Charles Wheatstone and Samuel Morse Charles Wheatstone and William Cooke Charles Wheatstone and Thomas Edison Hint Wheatstone Bridge MCQ for Exams 26). What is the main disadvantage of a Wheatstone bridge for resistance measurement? Sensitivity to environmental factors Limited measurement range Complexity of setup High cost of components Hint 27). Which type of Wheatstone bridge is commonly used for temperature measurement? Unbalanced Wheatstone bridge Kelvin bridge Carey Foster bridge Maxwell bridge Hint 28). Which type of Wheatstone bridge is used for accurate measurement of low resistances? Unbalanced Wheatstone bridge Kelvin bridge Carey Foster bridge Maxwell bridge Hint 29). Which type of Wheatstone bridge is used for measuring inductance and capacitance? Unbalanced Wheatstone bridge Kelvin bridge Carey Foster bridge Maxwell bridge Hint 30). Which type of Wheatstone bridge is commonly used for precision resistance measurement? Unbalanced Wheatstone bridge Kelvin bridge Carey Foster bridge Maxwell bridge Hint 31). Which type of Wheatstone bridge is used for high-precision measurement of resistance? Unbalanced Wheatstone bridge Kelvin bridge Carey Foster bridge Maxwell bridge Hint 32). In an unbalanced Wheatstone bridge, what does it indicate if the galvanometer shows a positive deflection? The unknown resistance is higher than the reference resistance. The unknown resistance is lower than the reference resistance. The bridge is perfectly balanced The galvanometer is faulty. Hint 33). What happens to the potential difference across the galvanometer in an unbalanced Wheatstone bridge? It becomes zero. It increases. It decreases. It becomes indeterminate. Hint 34). Charles Wheatstone was a prominent _____________________? Physicist Chemist Engineer Mathematician Hint 35). Charles Wheatstone is best known for inventing the _________________? Telegraph Telephone Microscope X-ray machine Hint 36). In addition to the Wheatstone bridge, Wheatstone is also known for inventing the: Kaleidoscope Steam engine Radio Phonograph Hint 37). Wheatstone conducted groundbreaking research in the field of _____________________? Electricity and magnetism Quantum mechanics Genetics Astronomy Hint 38). The sensitivity of a Wheatstone bridge is given by the formula _____________________? (ΔR₁ × ΔR₂) / (R₃ × R₄) (R₃ × R₄) / (R₁ × R₂) (R₁ × R₂) / (R₃ × R₄) (R₃ + R₄) / (R₁ + R₂) Hint 39). In a Wheatstone bridge, which formula represents the relationship between the unknown resistance and the known resistances? R_1 / R_2 = R_3 / R_x R_x = (R_1 * R_3) / R_2 R_x = (R_2 * R_3) / R_1 R_x = R_1 + R_2 + R_3 Hint 40). If the ratio of two known resistances in a Wheatstone bridge is 2:3 and the value of the unknown resistance is 10 Ω, what is the value of the third known resistance? 15 Ω 20 Ω 12 Ω 6 Ω Hint Wheatstone Bridge MCQ for Interviews 41). What is the formula for calculating the sensitivity of a Wheatstone bridge? Sensitivity = R_1 * R_2 / (R_3 * R_x) Sensitivity = (R_1 * R_3) / (R_2 * R_x) Sensitivity = (R_1 + R_2) / (R_3 + R_x) Sensitivity = R_1 – R_2 – R_3 – R_x Hint 42). A Wheatstone bridge is balanced when ____________________? The voltage across R_1 is equal to the voltage across R_2. The voltage across R_2 is equal to the voltage across R_3. The voltage across R_3 is equal to the voltage across R_x. The ratio of R_1 to R_2 is equal to the ratio of R_3 to R_x. Hint 43). The condition for a Wheatstone bridge to be balanced is _______________________? R_1 / R_2 = R_3 / R_x R_1 + R_2 = R_3 + R_x R_1 – R_2 = R_3 – R_x R_1 * R_2 = R_3 * R_x Hint 44). A Wheatstone bridge is balanced when the ratio of the known resistances is 2:3. If one of the known resistances is 60 ohms, what is the value of the other known resistance? 30 ohms 40 ohms 80 ohms 90 ohms Hint 45). Which of the following is a common application of the Wheatstone bridge? Temperature measurement Voltage amplification Frequency modulation Digital signal processing Hint 46). In a strain gauge measurement using a Wheatstone bridge, what does the bridge output indicate? Temperature Resistance Strain Voltage Hint 47). What is the advantage of using a Wheatstone bridge in resistance measurement? High accuracy Low cost Simple construction Wide dynamic range Hint 48). In a Wheatstone bridge, if the bridge is balanced, what can you say about the unknown resistance? It is infinite It is zero It is equal to the reference resistance It is equal to the sum of the other three resistances Hint 49). Which of the following is not an application of a Wheatstone bridge? Strain measurement Humidity sensing Pressure sensing Power factor correction Hint Read more about Power factor 50). Which of the following statements is true regarding Wheatstone bridge circuits? They can only measure DC voltages They are primarily used for power measurements They require a power supply to operate They are unaffected by temperature changes Hint Read more about power supply Time's up
