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

1. From the given circuit, find the value of I_{R}.

a) 0

b) V/I

c) V/R

d) Cannot be determined

View Answer

Explanation: In the given circuit, the voltage across the resistor is the same as the source voltage as they are connected in parallel. The current in the resistor is I

_{R}hence I

_{R}=V/R.

2. What is the relation between I_{R} and V in the following circuit?

a) I_{R} leads V

b) I_{R} lags V

c) I_{R} and V are in phase

d) No relation

View Answer

Explanation: In the following circuit I

_{R}and V are in phase because I

_{R}is the current in the resistor and the current in the resistor is always in phase with the voltage across it.

3. What is the expression for the current in the inductor from the following circuit?

a) V/I

b) V/X_{L}

c) 0

d) Cannot be determined

View Answer

Explanation: In the given circuit, the voltage across the inductor is the same as the source voltage as they are connected in parallel. The current in the inductor is I

_{L}hence I

_{L}=V/X

_{L}.

4. What is the phase relation between I_{L} and V from the following circuit?

a) I_{L} lags V

b) I_{L} leads V

c) I_{L} and V are in phase

d) No relation

View Answer

Explanation: IL is the current across the inductor and we know that the current across the inductor always lags the voltage across it. Hence IL lags V.

5. Find the expression for the current I from the given circuit.

a) I=I_{C}

b) I=I_{R}

c) I=I_{C}+I_{R}

d) I=0

View Answer

Explanation: I is the total current in the circuit. Since this is a parallel connection, the total current in the circuit is equal to the sum of the currents in each branch of the circuit. Hence I=I

_{C}+I

_{R}.

6. Find the total current if I_{C}=2A and I_{R}=5A.

a) 3A

b) -3A

c) 7A

d) 10A

View Answer

Explanation: I is the total current in the circuit. Since this is a parallel connection, the total current in the circuit is equal to the sum of the currents in each branch of the circuit. Hence I=I

_{C}+I

_{R}.

I=2+5=7A.

7. Find the value of I_{R} if I=10A and I_{C}=8A.

a) 5A

b) 18A

c) 12A

d) 2A

View Answer

Explanation: I is the total current in the circuit. Since this is a parallel connection, the total current in the circuit is equal to the sum of the currents in each branch of the circuit. Hence I=I

_{C}+I

_{R}.

10=8+I

_{R}=> I

_{R}=2A.

8. Find the value of IL if I_{C}=10A and I_{R}=6A.

a) 4A

b) 18A

c) 12A

d) 2A

View Answer

Explanation: I is the total current in the circuit. Since this is a parallel connection, the total current in the circuit is equal to the sum of the currents in each branch of the circuit. Hence I=I

_{C}+I

_{R}.

10=I

_{C}+6 => I

_{C}=4A.

9. What is the expression for the current in the capacitor from the following circuit?

a) V/C

b) V/I

c) 0

d) V/X_{C}

View Answer

Explanation: In the given circuit, the voltage across the capacitor is the same as the source voltage as they are connected in parallel. The current in the capacitor is I

_{C}hence I

_{C}=V/X

_{C}.

10. What is the phase relation between I_{C} and V from the following circuit?

a) I_{C} lags V

b) I_{C} leads V

c) I_{C} and V are in phase

d) No relation

View Answer

Explanation: I

_{C}is the current across the capacitor and we know that the current across the capacitor always leads the voltage across it. Hence I

_{C}leads V.

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