This set of Electric Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Kirchhoff’s Laws”.
1.KCL is based on the fact that
a) There is a possibility for a node to store energy.
b) There cannot be an accumulation of charge at a node.
c) Charge accumulation is possible at node
d) Charge accumulation may or may not be possible.
Explanation: Since the node is not a circuit element, any charge which enters node must leave immediately.
Explanation: According to KCL, entering currents=leaving currents.
3. The algebraic sum of voltages around any closed path in a network is equal to ____________
d) Negative polarity
Explanation: According to KVL, the sum of voltages around the closed path in a network is zero.
I1 = 3/3+5 = 3/8 = 0.375Ω
I2 = 4/5 = 0.8Ω
Vxy = vx – vy
Vx + 5I1 + 4 – 2I2 – vy = 0
Vx – vy = 2I2 – 4 – 5I1 = -4.275Ω
KVL: 70 – 5I – 7(I – 2) = 0
I = 7A
KVL to 2nd loop: 7(I – 2) – 2R = 0
I1 = I1 – I2 + 8 + I3 + 3
I2 – I3 = 11 -> 1
And -11 I1 – 7(I1 – I2) = 0
-18 I1 + 7 I2 = 0 -> 2
And -11 I1 – 15 I3 =0 -> 3
Solving I1 = 3.32A I2 = 8.5A I3 = -2.4A.
7. All _____________ are loops but _______________ are not meshes
a) Loops, Meshes
b) Meshes, loops
c) Branches, loops
d) Nodes, Branches
Explanation: A mesh cannot be divided further in loops.
Explanation: Veq = 10 + 5 -20 = -5u
Req = 5 + 2 + 3 = 10Ω
I = V/R = -5/10 = -0.5A.
9. The basic laws for analyzing an electric circuit are :-
a) Einstein’s theory
b) Newtons laws
c) Kirchhoff’s laws
d) Faradays laws
Explanation: Kirchhoff’s laws are used for analyzing an electric circuit.
10. A junction whell two (or) more than two network elements meet is known as a ______________
Explanation: Node is a junction where two or more than two network elements meet.
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.