Nodal Analysis MCQs

Practice Nodal Analysis MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1

Network TheoryNodal Analysis

In nodal analysis, the principal unknown quantities are usually?

ABranch powers
BNode voltages with respect to a reference node
CLoop charges
DOnly source currents

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Correct Answer: B. Node voltages with respect to a reference node

Explanation: Nodal analysis applies KCL to determine node voltages relative to a chosen reference or ground node.

Reference: Standard network theory: nodal analysis

Question 2

Network TheoryNodal Analysis

A node is connected to ground through a 5 ohm resistor and a 2 A current source injects current into the node. With no other branches, the node voltage is?

A2.5 V
B5 V
C10 V
D20 V

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Correct Answer: C. 10 V

Explanation: By KCL, V/5 = 2 A, so V = 10 V.

Reference: Standard network theory: nodal analysis

Question 3

Network TheoryNodal Analysis

In modified nodal analysis, an ideal voltage source connected between two non-reference nodes is commonly handled by introducing?

AAn additional source-current unknown and a voltage constraint equation
BAn open circuit in every case
CA short circuit in every case
DOnly a mesh-current equation with no node voltages

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Correct Answer: A. An additional source-current unknown and a voltage constraint equation

Explanation: Modified nodal analysis augments the node-voltage equations with an unknown current through the voltage source and an equation enforcing the source voltage.

Reference: Standard network theory: modified nodal analysis

Question 4

Network TheoryNodal Analysis

A supernode is formed in nodal analysis when an ideal voltage source is connected between?

ATwo non-reference nodes
BA node and a resistor only
CTwo current sources in series
DTwo reference nodes only

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Correct Answer: A. Two non-reference nodes

Explanation: A voltage source between two unknown-voltage nodes prevents direct branch-current expression by conductance, so the two nodes are treated together as a supernode.

Reference: Standard network theory: supernode

Question 5

Network TheoryNodal Analysis

Two non-reference nodes V1 and V2 are connected by an ideal 5 V source with V1 positive relative to V2. The required voltage constraint is?

AV1+V2=5
BV1-V2=5
CV2-V1=5
DV1V2=5

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Correct Answer: B. V1-V2=5

Explanation: The stated polarity means V1 is 5 V higher than V2, hence V1-V2=5 V.

Reference: Standard network theory: supernode constraint