# Limitations of Wheatstone Bridge

This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Limitations of Wheatstone Bridge”.

1. Wheatstone bridge can’t be used for measurement of _________
a) high resistance
b) medium resistance
c) low resistance
d) accurate resistance

2. Cost of maintenance of Wheatstone bridge is _________
a) low
b) high
c) depends on the components
d) depends on the source e.m.f

3. What is the effect of galvanometer on measurement of high resistance?
a) no effect
b) depends on the e.m.f source
c) galvanometer becomes insensitive to an imbalance
d) depends on the type of galvanometer used

4. What is the effect of heat on the resistances in a Wheatstone bridge?
a) no effect
b) increases the voltage drop across the circuit
c) decreases the current flowing through the circuit
d) causes a permanent change in the resistance values

5. Effect of high dc on Wheatstone bridge.
a) no effect
b) not susceptible
c) burns the circuit
d) increases the temperature

6. A Wheatstone bridge may not give accurate readings if _________
a) it is not balanced
b) it is balanced
c) the voltage drop across the circuit is maximum
d) excessive current flows through the circuit

7. What is the effect of lead wires on the Wheatstone bridge?
a) no effect
b) stabilizes the system
c) desensitizes the system
d) increases the resistance of the circuit

8. Why a Wheatstone bridge can’t be used for signal conditioning?
a) due to the galvanometer
b) due to excessive current flow
c) due to the e.m.f source used
d) due to lead wires

9. How to minimize the drift in the value of resistance measured using a Wheatstone bridge?
a) by using a high precision null detector
b) by keeping the lead wire resistances within 0.2 mΩ
c) by using a e.m.f source of minimum value
d) by minimizing the flow of current