Quiz on Wheatstone Bridge Principles

What are the two types of bridges used for measurement?

• DC bridges

• AC bridges

• Both DC and AC bridges

• None of the above

What is the purpose of the Wheatstone bridge?

• To measure resistance

• To measure capacitance

• To measure inductance

• All of the above

What happens when the Wheatstone bridge is balanced?

• Current through galvanometer is zero

• Current through galvanometer is maximum

• Resistance is infinite

• Voltage is zero

What is the effect of heating on the bridge arms?

• Changes in resistance

• No effect

• Increases sensitivity

• Decreases sensitivity

What is the sensitivity of the Wheatstone bridge governed by?

• Current sensitivity

• Voltage sensitivity

• Resistance sensitivity

• Temperature sensitivity

What is the Thevenin equivalent voltage in a Wheatstone bridge?

Calculate the deflection of the galvanometer caused by the 2005Ω unbalance in arm BC.

An ac bridge is in balance with the following constants: arm AB, R = 200 Ω in series with L = 15.9 mH R; arm BC, R = 300 Ω in series with C = 0.265 μF; arm CD, unknown; arm DA, = 450 Ω. The oscillator frequency is 1 kHz. Find the constants of arm CD.

A capacitance comparison bridge is used to measure the capacitive impedance at a frequency of 3kHz. The bridge constants at bridge balance are, Calculate the equivalent series circuit of the unknown impedance.

An inductance comparison bridge is used to measure the inductive impedance at a frequency of 2kHz. The bridge constants at bridge balance are: R1=1kΩ, R2 = 2kΩ, R3 = 1.5kΩ L3 = 1.2mH Calculate the components of the series unknown impedance.