This set of Network Theory Multiple Choice Questions & Answers (MCQs) focuses on “Circuit Elements and Kirchhoff’s Laws”.

1. Potential difference in electrical terminology is known as?

a) Voltage

b) Current

c) Resistance

d) Conductance

View Answer

Explanation: Potential difference in electrical terminology is known as Voltage and is denoted either by V or v. It is expressed in terms of energy per unit charge.

2. The circuit in which current has a complete path to flow is called ______ circuit.

a) short

b) open

c) closed

d) open loop

View Answer

Explanation: The circuit in which current has a complete path to flow is called closed circuit. When the current path is broken so that current cannot flow, the circuit is called an open circuit.

3. If the voltage-current characteristics is a straight line through the origin, then the element is said to be?

a) Linear element

b) Non-linear element

c) Unilateral element

d) Bilateral element

View Answer

Explanation: If the voltage-current characteristic is a straight line through the origin, then the element is said to be Linear element. The difference in potential energy of charges is called Potential difference.

4. The voltage across R_{1} resistor in the circuit shown below is?

a) 10

b) 5

c) 2.5

d) 1.25

View Answer

Explanation: According to voltage divider rule, 10v is divide equally across resistors R

_{1}and R

_{2}. So the voltage across R

_{1}will be 5v.

5. The energy stored in the inductor is?

a) Li²/4

b) Li²/2

c) Li²

d) Li²/8

View Answer

Explanation: The energy stored in the inductor the area under the power of the inductor and is given by W= ʃpdt = ʃLidi = Li²/2.

6. How many types of dependent or controlled sources are there?

a) 1

b) 2

c) 3

d) 4

View Answer

Explanation: There are 4 dependent or controlled sources. They are VCVS(Voltage Controlled Voltage Source), VCCS(Voltage Controlled Current Source, CCVS(Current Controlled Voltage Source, CCCS(Current Controlled Current Source).

7. Find the voltage V_{x} in the given[/expand] circuit.

a) 10

b) 20

c) 30

d) 40

View Answer

Explanation: From the circuit applying Kirchhoff’s voltage law, we can write 50= 15+ 10+ 15+V

_{x}=> V

_{x}= 10V.

8. If the resistances 1Ω, 2Ω, 3Ω, 4Ω are parallel, then the equivalent resistance is?

a) 0.46Ω

b) 0.48Ω

c) 0.5Ω

d) 0.52Ω

View Answer

Explanation: The equivalent resistance 1/R

_{t}= (1/R

_{1})+(1/R

_{2})+(1/R

_{3})+(1/R

_{4}). And R

_{1}, R

_{2}, R

_{3}, R

_{4}are 1Ω, 2Ω, 3Ω, 4Ω respectively. => R

_{t}= 0.48Ω.

9. Find total current(mA) in the circuit.

a) 1

b) 2

c) 3

d) 4

View Answer

Explanation: R

_{2}is parallel to R

_{3}. So equivalent resistance of R

_{2}and R

_{3}is 1K. The total resistance in the circuit is (1+1+1)K= 3K.Current in the circuit is 3V/3KΩ= 1mA.

10. If the resistances 3Ω, 5Ω, 7Ω, 9Ω are in series, then their equivalent resistance(Ω) is?

a) 9

b) 20

c) 24

d) 32

View Answer

Explanation: If the resistances are in series, then equivalent resistance is the sum of all the resistances that are in series. Equivalent resistance is (3+5+7+9)Ω= 24Ω.

**Sanfoundry Global Education & Learning Series – Network Theory.**

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