This set of Electric Circuits Questions and Answers for Experienced people focuses on “The Mesh-Current Method and Dependent Sources and Some Special Cases”.
1. The loop which does not contain any other inner loop is known as _____________
a) A node
b) A mesh
c) A branch
d) A super mesh
Explanation: A mesh is defined as a loop which does not contain any other loop within it.
2. If there are 6 branches and 4 essential nodes, how many equations are required to describe a circuit in mesh-current method?
Explanation: In Mesh-Current method, b-(n-1) equations are required to describe the circuit. b= the number of branches and n= the number of essential nodes.
Explanation: There are 3 meshes in the given circuit. Assuming currents I1, I2, I3 in the 3 meshes and by applying KVL, equations will be obtained which on solving gives the respective currents flowing in the circuits.
4. A Super Mesh analysis could be done when there is a common _____________ between any two loops.
a) Voltage source
b) Current source
d) Both voltage and current source
Explanation: A Super Mesh analysis could be done when there is a common current source between any two loops.
Explanation: Loop2 and loop3 forms a supermesh.
KVL at Supermesh: -2I1+3I2+3I3=0
Solving these gives the currents flowing in the circuit and current through 10Ω resistor is either I1-I2 or I2-I1.
Explanation: 3 loops and a supermesh between loop1 and loop3. Using KVL currents are found out. I1=9A, I2=2.5A, I3=2A. As voltage source is in 1st loop, Power delivered by voltage source=V*I1.
7. The Mesh-Current method is applicable only for ___________
a) Non-linear networks
b) Equivalent networks
c) Non-planar networks
d) Planar networks
Explanation: The Mesh-Current method is applicable only for Planar networks. A network is said to be planar if there are no crossovers in it and it can be drawn freely on a plane surface.
Explanation: Applying KVL, currents could be found out. I1=0.4A, I2=2.4A. VX=-I1R1.
9. A Supermesh is formed between two loops which share a common voltage source.
Explanation: Meshes that share a current source with other meshes, none of which contains a current source in the outer loop, forms a supermesh.
10. If 4 equations are required to describe a circuit by Mesh-Current method and there are n nodes. How many branches are there in the network?
Explanation: Standard formulae: b-(n-1)
Given b-(n-1) =4 -> b=4+ (n-1) =n+3.
11. If there are 16 branches and 5 essential nodes, how many equations are required to describe a circuit in mesh-current method?
Explanation: In Mesh-Current method, b-(n-1) equations are required to describe the circuit. b=the number of branches and n= the number of essential nodes.
Explanation: Mesh1 and Mesh2 form a super mesh. Assuming currents I1 and I2 and applying KVL, the current through required resistor is found out.
13. Mesh analysis is best suitable for _____________
a) Current sources
b) Voltage sources
c) Complex elements
d) Unilateral elements
Explanation: Mesh analysis is best suitable for Current sources.
Sanfoundry Global Education & Learning Series – Electric Circuits.
To practice all areas of Electric Circuits for Experienced people, here is complete set of 1000+ Multiple Choice Questions and Answers.