This set of Basic Electrical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Series Circuits and Parallel Networks”.

1. It is preferable to connect bulbs in series or in parallel?

a) Series

b) Parallel

c) Both series and parallel

d) Neither series nor parallel

View Answer

Explanation: Bulbs are connected in parallel so that even if one of the bulbs blow out, the others continue to get a current supply.

2. Calculate the total resistance between the points A and B.

a) 7 ohm

b) 0 ohm

c) 7.67 ohm

d) 0.48 ohm

View Answer

Explanation: Total resistance= 1||2 in series with 3 ohm and 4 ohm.

3. Calculate the equivalent resistance between A and B.

a) 60 ohm

b) 15 ohm

c) 12 ohm

d) 48 ohm

View Answer

Explanation: The 5 ohm and 15 ohm resistances are connected in parallel with the series connec-tion of the 10 ohm and 30 ohm resistors.

4. Calculate the resistance between A and B.

a) 3.56 ohm

b) 7 ohm

c) 14.26 ohm

d) 29.69 ohm

View Answer

Explanation: The 1 ohm, 2 ohm and 3 ohm resistors are connected in series. Its equivalent re-sistance is in series with the 4 ohm resistor and the parallel connection of the 5 ohm and 6 ohm resistor. The equivalent resistance of this combination is 7.26 ohm. The 7.26 ohm and the 7 ohm resistor are connected in parallel hence the total resistance=3.56 ohm.

5. Batteries are generally connected in______

a) Series

b) Parallel

c) Either series or parallel

d) Neither series nor parallel

View Answer

Explanation: Batteries are generally connected in series so that we can obtain the desired voltage since voltages add up once they are connected in series.

6. In a _________ circuit, the total resistance is greater than the largest resistance in the circuit.

a) Series

b) Parallel

c) Either series or parallel

d) Neither series nor parallel

View Answer

Explanation: In series circuits the total resistance is the sum of all the resistance in the circuit, hence the total is greater than the largest resistance.

7. In a ____________ circuit, the total resistance is smaller than th smallest resistance in the circuit.

a) Series

b) Parallel

c) Either series or parallel

d) Neither series nor parallel

View Answer

Explanation: in a parallel circuit, the equivalent resistance=1/sum of the reciprocals of all the re-sistances in the circuit. Hence it is smaller than the smallest resistance in the circuit.

8. Which is the most cost efficient connection?

a) Series

b) Parallel

c) Either series or parallel

d) Neither series nor parallel

View Answer

Explanation: The advantage of series-connections is that they share the supply voltage, hence cheap low voltage appliances may be used.

9. Calculate the equivalent resistance between A and B.

a) 2 ohm

b) 4 ohm

c) 6 ohm

d) 8 ohm

View Answer

Explanation: R=((2+3)||5)+1.5)||4.The 2 and the 3 ohm resistor are in series. The equiva-lent of these two resistors is in parallel with the 5 ohm resistor. The equivalent of these three resistances is in series with the 4 ohm resistor. Finally, the equivalent of these re-sistances is in parallel with the 1.5 ohm resistor.

10. Calculate the equivalent resistance between A and B.

a) 6.67 ohm

b) 46.67 ohm

c) 26.67 ohm

d) 10.67 ohm

View Answer

Explanation: R=20||20||20=6.67 ohm. The three 20 ohm resistors are in parallel and re-sistance is measured across this terminal.

**Sanfoundry Global Education & Learning Series – Basic Electrical Engineering.**

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