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 IR.

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 IR hence IR=V/R.

2. What is the relation between IR and V in the following circuit?

a) IR leads V

b) IR lags V

c) IR and V are in phase

d) No relation

View Answer

Explanation: In the following circuit IR and V are in phase because IR 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/XL

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 IL hence IL=V/XL.

4. What is the phase relation between IL and V from the following circuit?

a) IL lags V

b) IL leads V

c) IL 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=IL

b) I=IR

c) I=IL+IR

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=IR+IL.

6. Find the total current if IL=2A and Ir=5A.

a) 3A

b) -3A

c) 7A

d) 10A

View Answer

Explanation: We know that I=IR+IL.

Substituting the values from the question, we get I=7A.

7. Find the value of IR if I=10A and IL=8A.

a) 5A

b) 18A

c) 12A

d) 2A

View Answer

Explanation: We know that I=IR+IL.

Substituting the values from the question, we get IR=2A.

8. Find the value of IL if I=10A and IR=6A.

a) 4A

b) 18A

c) 12A

d) 2A

View Answer

Explanation: We know that I=IR+IL.

Substituting the values from the question, we get IL=4A.

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

a) V/C

b) V/I

c) 0

d) V/XC

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 IC hence IC=V/XC.

10. What is the phase relation between IC and V from the following circuit?

a) IC lags V

b) IC leads V

c) IC and V are in phase

d) No relation

View Answer

Explanation: IC is the current across the capacitor and we know that the current across the capacitor always leads the voltage across it. Hence IC leads V.

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

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