Measuring Resistance the Wheatstone Bridge and Delta-to-Wye (Pi-to-Tee) Equivalent Circuits MCQ’s

Electric Circuits Electronics & Communication Engineering

This set of Electric Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Measuring Resistance the Wheatstone Bridge and Delta-to-Wye (Pi-to-Tee) Equivalent Circuits”.

1. The relation between the resistances in the given Wheatstone bridge circuit is _____________

electric-circuits-interview-questions-answers-freshers-q2

a) P/S = R/Q
b) PR = QS
c) P/Q = R/S
d) PQ = RS

2. Find the unknown resistance value in given circuit.

electric-circuits-interview-questions-answers-freshers-q3

a) 10.2Ω
b) 11.7Ω
c) 10.5Ω
d) 11.5Ω

3. The Wheatstone Bridge is mainly used to measure ______________
a) Currents
b) Voltages
c) Node potentials
d) Resistances

4. Lower resistances are difficult to measure using Wheatstone bridge circuit because of ____________
a) Leakage currents
b) I2R effects
c) Power dissipation
d) Thermal breakdown

5. The other name for Delta connection is ___________
a) Star connection
b) Pi connection
c) T connection
d) Y connection

6. If R2 = RC RA / (RA +RB +RC ) then R3 equals?
a) RA RB / (RA +RB +RC )
b) RC RA / (RA +RB +RC )
c) RB RC / (RA +RB +RC )
d) RX RA / (RA +RB +RC )

7. If P/Q=1, unknown resistance S=1000Ω and R could be varied from 0 to 100Ω then the bridge could be ___________
a) A balanced circuit
b) A rectified circuit
c) An unbalanced circuit
d) An identical circuit

8. Star connection can also be called as Y (or) T connection.
a) True
b) False

9. Convert the given Delta circuit to star circuit and give the Ra , Rb and Rc values.

electric-circuits-interview-questions-answers-freshers-q9

a) Ra=5Ω, Rb = 4.5Ω, Rc=4.67Ω
b) Ra=4Ω, Rb=4.30Ω, Rc=4.66Ω
c) Ra=3Ω, Rb=4Ω, Rc =5Ω
d) Ra=5.2Ω, Rb=4.2Ω, Rc =4.89Ω

10. Convert the given star network into Pi network and calculate the sum of all the resistances in the obtained Pi network.

electric-circuits-interview-questions-answers-freshers-q11

a) 125.5Ω
b) 122.5Ω
c) 127.8Ω
d) 129.8Ω

11. A Wheatstone bridge is balanced when the galvanometer shows __________ reading.
a) 0A
b) 1A
c) Infinity
d) -1A

12. Find VAB if iAB = 5A.

electric-circuits-interview-questions-answers-freshers-q10

a) 32.76V
b) 35.56V
c) 36.12V
d) 34.21V

13. The star and delta networks would be electrically equal if resistances measured between any pair of terminals __________
a) Is different
b) Greater in star
c) Greater in delta
d) Is equal

14. __________ are difficult to measure using Wheatstone bridge.
a) Higher resistances
b) Currents
c) Lower resistances
d) Voltages

15. What will be the resistance between B and C when the network given below is converted into delta?

electric-circuits-interview-questions-answers-freshers-q15

a) 13Ω
b) 8.66Ω
c) 6.5Ω
d) 7.33Ω

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