Electric Circuits Questions and Answers – Voltage and Current Sources ,Electrical Resistance

This set of Electric Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Voltage and Current Sources, Electrical Resistance”.

1. The symbol used for representing Independent sources
a) Diamond
b) Square
c) Circle
d) Triangle

Explanation: Independent sources are represented by circle
Dependent sources are represented by Diamond.

2. Controlled sources are also known as
a) Independent sources
b) Dependent sources
c) Ideal sources
d) Voltage sources

Explanation: Voltage V = dw/dq and its SI unit is Volt.

3. I3 = α vx. This is _________

a) Voltage control voltage source
b) Current control voltage source
c) Voltage control current source
d) Current control current source

Explanation: i3 =αvx means ix value depends on vx
Controlled voltage is vx.

4. Inductor is _______________ element.
a) Active
b) Passive
c) Linear
d) Polar

Explanation: Passive element means it could not generate electricity.

5. Which of the below is valid?

a) 1
b) 2
c) Both
d) Neither 1 nor 2

Explanation: Same Voltage

6. The below circuit is valid.

a) False
b) True

Explanation: Independent current source supplied current through terminals a and b. Dependent source supplies voltage across the same pair of terminals and an ideal current source supplies same current regardless of voltage, similarly an ideal voltage source supplies same voltage irrespective of current, so this is an allowable connection.

7. The opposing capacity of materials against the current flow is
a) Conductance
b) Inductance
c) Susceptance
d) Resistance

Explanation: The opposing capacity of materials against the current flow is resistance.

8. The conductance of a 923Ω resistance is
a) 1.08 * 10-3 mho
b) 1.08 * 10-4 mho
c) 1.02 * 10-3 mho
d) 1.02 * 10-4 mho

Explanation: c=1/R =1/923 = 1.08 * 10-3 mho

9. The current passing through a circuit is 7.2A and the power at the terminals is 27 watts.
Existence is ___________ ohms.
a) 0.5402
b) 0.5208
c) 0.5972
d) 0.5792

Explanation: p = vi
= (iR) i
= i2 R
R = P/i2
=27/ (7.2)2
= 0.5208Ω.

10. Relation between power, voltage and conductance
a) V = P2.G
b) V = P2/G
c) P = v2/G
d) P = V2 G

Explanation: P = vi
= v (v/R)
= v2/R
= v2G.

Sanfoundry Global Education & Learning Series – Electric Circuits.

To practice all areas of Electric Circuits, here is complete set of 1000+ Multiple Choice Questions and Answers.

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