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

View Answer

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

2. 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

View Answer

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.

3. 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.

4. Nodal analysis is generally used to determine?

a) Voltage

b) Current

c) Resistance

d) Power

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

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

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