This set of Basic Electrical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Kirchhoff’s Laws and Network Solution”.

1. Mesh analysis is generally used to determine?

a) Voltage

b) Current

c) Resistance

d) Power

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Explanation: Mesh analysis uses Kirchhoff’s Voltage Law to find all the mesh currents. Hence it is a method used to determine current.

2. KVL is associated with____________

a) Mesh analysis

b) Nodal analysis

c) Both mesh and nodal

d) Neither mesh nor nodal

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Explanation: KVL employs mesh analysis to find the different mesh currents by finding the IR products in each mesh.

3. KCL is associated with_________

a) Mesh analysis

b) Nodal analysis

c) Both mesh and nodal

d) Neither mesh nor nodal

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Explanation: KCL employs nodal analysis to find the different node voltages by finding the value if current in each branch.

4. Nodal analysis is generally used to determine?

a) Voltage

b) Current

c) Resistance

d) Power

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Explanation: Nodal analysis uses Kirchhoff’s Current Law to find all the node voltages. Hence it is a method used to determine voltage.

5. Find the value of the source current from the following circuit.

a) 2.54A

b) 6.67A

c) 3.35A

d) 7.65A

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Explanation: I

_{3}=(3+j0)A

V

_{2}=I

_{3}R=(3+j0)(8+j0)=(24+j0)V

I2=V2/Xc=(j1.5) A

I1 =I2 +I3 =(0+j1.5)+(3+j0)=(3+j1.5)A

I1=(3

^{2}+1.5

^{2})

^{1/2}= 3.35A.

6. Find the value of the source voltage from the following circuit.

a) 49.2V

b) 34.6V

c) 65.2V

d) 25.6V

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Explanation: I3 =(3+j0)A

V2 =I3R=(3+j0)(8+j0)=(24+j0)V

I2=V2/Xc=(0 + j1.5) A

I1 =I2 +I3 =(0+j1.5)+(3+j0)=(3+j1.5)A

I1=(3

^{2}+1.5

^{2})

^{1/2}= 3.35A.

V1 =I1(R+jXL) =(15+j30)V

E=V1 +V2 =(39+j30)V

E=(39

^{2}+30

^{2})

^{1/2}= 49.2V.

7. According to KVL, the algebraic sums of all the IR products and the voltages in a loop is?

a) Always positive

b) Always negative

c) Always zero

d) Always infinity

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Explanation: According to KVL, the algebraic sums of all the IR products and the voltages in a closed loop are always equal to zero due to the law of conservation of energy.

8. Kirchhoff’s laws are valid for ___________

a) Linear circuits only

b) Both linear and non-linear circuits

c) Neither linear nor non-linear circuits

d) Both linear and non-linear circuits

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Explanation: KCL and KVL both are applied for both linear and non linear circuits because they are formulated fro the physical laws of conservation of energy and charge respectively.

9. KCL is based on _____________

a) Law of conservation of energy

b) Law of conservation of charge

c) Both conservation of energy and charge

d) Neither conservation of energy nor charge

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Explanation: Kirchhoff’s current law is based on the law of conservation of charge. It states that the sum of the currents entering and leaving a junction taken with the correct sign is equal to zero.

10. KVL is based on ___________

a) Law of conservation of energy

b) Law of conservation of charge

c) Both conservation of energy and charge

d) Neither conservation of energy nor charge

View Answer

Explanation: Kirchhoff’s current law is based on the law of conservation of energy. According to KVL, the algebraic sums of all the IR products and the voltages in a closed loop are always equal to zero due to the law.

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