Free Circuit Analysis MCQs with Answers

• A. Capacitance
• B. Ideal current source
• C. Ideal voltage source
• D. All of the above

Explanation: A capacitance is passive because it stores energy in its electric field but does not generate energy.

• A. linear network
• B. non-linear network
• C. passive network
• D. active network

Explanation: An active network contains at least one source capable of supplying electrical energy, whether it has one source or several.

• A. equal to load resistance
• B. less than the load resistance
• C. greater than the load resistance
• D. none of the above

Explanation: For maximum power transfer in a resistive circuit, the load resistance must equal the source's internal resistance.

• A. 100%
• B. 80%
• C. 75%
• D. 50%

Explanation: At maximum power transfer, the load resistance equals the source resistance, causing equal power dissipation in the source resistance and…

• A. by removing voltage sources along with their internal resistances
• B. by short-circuiting the given two terminals
• C. between any two 'open' terminals
• D. between same open terminals as for Etk

Explanation: After deactivating independent sources, the Thevenin resistance is measured between the same two open terminals used to determine the…

• A. junction in a network
• B. closed loops in a network
• C. electric circuits
• D. electronic circuits

Explanation: Kirchhoff's current law is applied at a junction or node, where the algebraic sum of currents is zero.

• A. The above statement is associated with
• B. compensation theorem
• C. superposition theorem
• D. reciprocity theorem
• E. none of the above

Explanation: This is the reciprocity theorem: in a linear bilateral network, interchanging the positions of excitation and response gives the same…

• A. all independent sources are made dead
• B. only current sources are made dead
• C. only voltage sources are made dead
• D. all voltage and current sources are made dead

Explanation: To find Thevenin or Norton resistance, all independent sources are deactivated: ideal voltage sources become short circuits and ideal…

• A. sources, nodes and meshes
• B. sources and nodes
• C. sources
• D. nodes

Explanation: Superposition analyzes one independent source at a time, so a network with n independent sources requires n corresponding source-active…

• A. all independent current sources are short circuited and independent voltage sources are open circuited
• B. all independent voltage sources are open circuited and all independent current sources are short circuited
• C. all independent voltage and current sources are short circuited
• D. all independent voltage sources are short circuited and all independent current sources are open circuited

Explanation: When finding the equivalent impedance, an ideal independent voltage source is replaced by a short circuit and an ideal independent current…

• A. branch
• B. loop
• C. circuit
• D. junction

Explanation: A loop is a closed path through the branches of a network that returns to its starting point without requiring an open end.

• A. node
• B. terminus
• C. combination
• D. anode

Explanation: A node is a connection point joining circuit branches, and a junction is commonly defined as a node where three or more branches meet.

• A. superposition condition
• B. homogeneity condition
• C. both homogeneity as well as superposition condition
• D. homogeneity, superposition and associative condition

Explanation: A nonlinear network fails the homogeneity condition and therefore cannot generally satisfy superposition.

• A. unilateral circuit
• B. bilateral circuit
• C. irreversible circuit
• D. reversible circuit

Explanation: A bilateral circuit behaves the same when its direction of current or voltage is reversed, as in an ideal resistor.

• A. nonlinear elements only
• B. linear elements only
• C. linear, non-linear, active and passive elements
• D. linear, non-linear, active, passive, time varying as wells as time-in-variant elements

Explanation: KVL follows from conservation of energy and applies to lumped circuits containing linear or nonlinear, active or passive elements, whether…

• A. passive networks only
• B. a.c. circuits only
• C. d.c. circuits only
• D. both a.c. as well d.c. circuits

Explanation: Kirchhoff’s laws are general circuit laws and apply to both steady direct-current circuits and alternating-current circuits.

• A. bilateral and active component
• B. active, passive, linear and nonlinear component
• C. linear and bilateral component
• D. non-linear and active component

Explanation: A usual capacitor is a passive, linear, bilateral component: its voltage-current relation is linear for a constant capacitance and it…

• A. Millman's theorem
• B. Thevenin's theorem
• C. Superposition theorem
• D. Maximum power transfer theorem

Explanation: The statement gives the maximum power transfer condition, for which a resistive load equals the Thevenin resistance seen from the load…

• A. reciprocity
• B. duality
• C. non-linearity
• D. linearity

Explanation: Superposition works because voltage and current in a linear network are sums of the responses produced by individual independent sources.

• A. negative
• B. positive
• C. determined by battery e.m.fs.
• D. zero

Explanation: KVL states that the algebraic sum of all voltage rises and drops around any closed loop is zero.