Thevenin's Theorem Viva Questions and Answers

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Question-1. How does Thevenin's theorem simplify circuit analysis?

Answer-1: Thevenin's theorem simplifies circuit analysis by reducing a complex circuit to a simpler equivalent circuit, making it easier to analyze and understand.

Question-2. Can Thevenin's theorem be applied to nonlinear circuits?

Answer-2: No, Thevenin's theorem is only applicable to linear electrical networks.

Question-3. When would you use Thevenin's theorem?

Answer-3: Thevenin's theorem is useful for simplifying complex circuits, especially when analyzing circuits with multiple sources and resistors.

Question-4. How do you calculate the Thevenin equivalent voltage (VTH)?

Answer-4: VTH is the open-circuit voltage across the terminals of the original network.

Question-5. How do you calculate the Thevenin equivalent resistance (RTH)?

Answer-5: RTH is the equivalent resistance across the terminals of the original network when all the sources are turned off (replaced by their internal resistances, if any).

Question-6. Can a circuit have multiple Thevenin equivalent circuits?

Answer-6: No, Thevenin's theorem guarantees that there is only one Thevenin equivalent circuit for a given original circuit.

Question-7. What are the steps involved in applying Thevenin's theorem to a circuit?

Answer-7: Find the Thevenin equivalent voltage by removing the load and calculating the voltage across its terminals. Then find the Thevenin equivalent resistance by deactivating all sources and calculating the resistance across the terminals.

Question-8. Can Thevenin's theorem be applied to circuits with capacitors and inductors?

Answer-8: No, Thevenin's theorem is limited to resistive networks. It cannot be applied directly to circuits containing capacitors and inductors.

Question-9. Can Thevenin's theorem be applied to AC circuits?

Answer-9: Yes, Thevenin's theorem can be applied to both DC and AC circuits, provided they are linear.

Question-10. How does Thevenin's theorem relate to superposition theorem?

Answer-10: Thevenin's theorem is a simplification technique for linear circuits, while superposition theorem allows for analysis by considering the effects of individual sources one at a time.

Question-11. Can Thevenin's theorem be used to find maximum power transfer?

Answer-11: Yes, Thevenin's theorem can be used to find the load resistance for maximum power transfer by matching the load resistance to the Thevenin equivalent resistance.

Question-12. What is the Thevenin equivalent circuit's power output when the load resistance matches the The

Answer-12: When the load resistance matches the Thevenin equivalent resistance, the power output is maximized and equal to (V_{TH})2 / (4 * R_{TH}).

Question-13. How does Thevenin's theorem help in circuit design?

Answer-13: Thevenin's theorem allows designers to replace complex parts of a circuit with simpler equivalents, facilitating easier analysis, troubleshooting, and redesign.

Question-14. Can we use Thevenin’s theorem on a circuit containing a BJT?

Answer-14: We can use Thevenin’s theorem only for linear networks. BJT is a non-linear network hence we cannot apply Thevenin’s theorem for it.

Question-15. Which is known as dual of the Thevenin's Theorem.

Answer-15: Norton'sTheorem is known as dual of the Thevenin's Theorem.

Question-16. State Thevenin's theorem?

Answer-16: Any linear two terminal networks consisting of resistances and sources of emf can be replaced by a single source of emf V_{th} in serial with a single resistance R_{th}

V_{th}= Open circuit voltage at the two specified terminals

R_{th} =Resistance looking back into the network with all the source of emf shorted and replaced by their internal resistance.

Question-17. How do you Thevinise the given network?

Answer-17:

A) Calculate the open circuit voltage V_{th} (R_{L} is disconnected)

B) Replace voltage source by a short circuit in series with the internal resistance of the voltage source or replace each current source by an open circuit in parallel with the internal resistance of the current source.

C) Calculate R_{th}

V_{th} is in series with R_{th} and R_{L}

Question-18. What is a Voltage source?

Answer-18: The source which has very low internal resistance.

Question-19. What is current source?

Answer-19: The source which has very high internal resistance.

Question-20. What is a circuit element?

Answer-20: A Circuit component with two terminals by which it can be connected to other electric components is called circuit element. Examples: Resistor, Capacitor and Inductor.

Question-21. What are active elements?

Answer-21: Circuit elements which supply energy to a network are called active elements. Examples: Batteries, Generators, Transistors etc.

Question-22. What are passive elements?

Answer-22: Circuit elements which either absorb or store energy are called passive elements. Examples: Resistors, Inductors and Capacitors.

Question-23. What is a node (Junction)?

Answer-23: It is point is a network where two or more elements (Currents) meet.

Question-24. What is mesh or loop?

Answer-24: A closed path for the current in a given network is called the mesh or loop.

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Thevenin's Theorem Questions with Answers

Thevenin's Theorem Trivia MCQ Quiz

- Electric Current
- Electricity
- Maximum Power Theorem
- Thevenin's Theorem
- Kelvins Bridge Experiment
- Ohms Law
- Kirchhoffs Law KCL and KVL
- Mesh Analysis
- Parallel elements & Current Division
- Series elements & Voltage Division
- Star Delta Connection
- Nodal Analysis
- Norton's Theorem
- Superposition Theorem
- Reciprocity Theorem
- Single Phase Transformer
- Single Phase Induction Motor
- RLC Circuits
- Three-Phase Systems
- Maxwell's Equations
- Transmission Lines
- Smith Chart
- Electrical Safety
- Grounding and Bonding
- Circuit Breaker
- Electric Grids and Smart Grids
- Electric Power Transmission
- Electrical Maintenance
- Fault Analysis
- Network Analysis
- Alternating Current