# Instrumentation Transducers Questions and Answers – Measurement of Resistance

This set of Instrumentation Transducers Multiple Choice Questions & Answers (MCQs) focuses on “Measurement of Resistance”.

1. Given a Wheatstone-bridge with external voltage V, Resistance Bridge with resistances P, Q, R, S, and galvanometer G. What is the balancing condition of bridge?

a) PQ=SR
b) PS=RQ
c) P = RQ
d) S = RQ

Explanation: A Wheatstone bridge is said to be balanced when galvanometer shows null deflection that is zero current flow through that path.

2. Who invented the Wheatstone bridge?
a) Samuel Hunter Christie
b) Sir Charles Wheatstone
c) Joseph henry
d) Andrew Kay

Explanation: Wheatstone bridge was invented by Samuel Hunter in 1833, but it was improved and popularized by Charles Wheatstone in 1843.

3. In a Wheatstone bridge, which of the following is used as a null detector?
a) Ammeter
b) Galvanometer
c) Voltmeter
d) Wattmeter

Explanation: Null detector is used to indicate zero current flow, and the device used is galvanometer.

4. Which of the following can be measured using a Wheatstone bridge?
a) Resistance only
b) Capacitance only
c) Inductance only
d) Resistance, capacitance, inductance, impedance

Explanation: Wheatstone bridge cannot be limited to measurement of a single quantity only, it can be used to measure resistance, capacitance, impedance, inductance etc. with some modifications.

5. Which of the following device is used for measuring low resistance value?
a) Wheatstone bridge
b) Hay bridge
c) Kelvin bridge
d) Owens bridge

Explanation: Kelvin Bridge is used for measuring very low resistance values. Low resistance value is below 1Ω.
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6. A null type instrument with DC excitation is _________________
a) Wheatstone bridge
b) Hay bridge
c) Anderson bridge
d) Wien bridge

Explanation: Wheatstone bridge is used for measuring resistance, which has a null detector circuit and external DC voltage.

7. Which of the following device is used with 4 terminal resistors?
a) Wheatstone bridge
b) Hay bridge
c) Wien bridge
d) Kelvin bridge

Explanation: Kelvin Bridge is used to work with 4 terminal resistances.

8. Why 4 terminal resistors are used?
a) For protection
b) To overcome parasitic resistances
c) To increase current flow
d) None of the mentioned

Explanation: Four terminals in resistance are used for overcoming parasitic resistances.

9. What are the four terminals in four terminal resistance?
a) 3 current terminals and one voltage terminal
b) Two potential terminals and two current terminals
c) Four voltage terminals
d) Four current terminals

Explanation: Four terminals are, a pair of potential terminals and a pair of current terminals.

10. Accuracy in a bridge measurement depends on_____________
a) Sensitivity of detector
b) Applied voltage
c) Both Sensitivity and applied voltage
d) Accuracy of indicator

Explanation: Both sensitivity of indicator and applied voltage affects the accuracy in bridge measurement.

Sanfoundry Global Education & Learning Series – Instrumentation Transducers.

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