SRM University 2007 B.Tech Electronics and Communications Engineering BANK :CIRCUIT THEORY -UNIT III - Question Paper

ques. BANK

EC100 CIRCUIT THEORY

UNIT III - TRANSIENTS

PART – A

1. Define Transient state.
2. Define Transient time.
3. Distinguish natural response and forced response.
4. Draw the DC response of RL series circuit.
5. Draw the DC response of RC series circuit.
6. Draw the DC response of RLC series circuit.
7. Write complete solution of current for RL series circuit with AC excitation
8. Write complete solution of current for RC series circuit with AC excitation.
9. Write complete solution of current for RLC series circuit with AC excitation.
10. What is complex frequency?
11. What is the Time constant of RL series circuit?
12. What is the Time constant of RC series circuit?
13. When does transient behavior occur in any circuit?
14. How much current will pass through the inductor at t=0 , when a series RL circuit is connected to a voltage V at t=0?
15. How much current will pass through the circuit at t=0 , when a series RC circuit is connected to a constant voltage at t=0?
16. When does the transient current in an RLC current is oscillatory?
17. Inductor does not allow sudden modifications in current. [True / False]
18. Capacitor does not allow sudden modifications in voltage. [True / False]
19. In which kind of circuit transient response occurs?
20. What kind of transient current response will be found when loss free LC circuit executed from an ac source
21. What is steady state of a circuit?
22. Write expression for current in RL series circuit with DC excitation.
23. Write expression for current in RC series circuit with DC excitation.
24. Write expression for current in RLC series circuit with DC excitation.
25. Write expression for power in resistor of RLC series circuit with DC excitation
26. Write expression for power in resistor of RL series circuit with DC excitation.
27. Write expression for power in the resistor of RC series circuit.
28. What are the other names of source – free response?
29. Why does the complete response consist of two parts – The forced response and the natural response?
30. What is damping?
31. When do you get transient response? Why?
32. Define time constant
33. Define time constant of (a) R-L circuit and (b) R-C circuit
34. What is meant by transient response
35. Define natural response and forced response
36. What is meant by zero-input response
37. What is meant by zero-state response
38. If R=40?, L=0.2H, C=100?F are connected in series and a step voltage is applied to the circuit. obtain the damping ration and frequency of damped oscillations.
39. A dc voltage of 100 volts is applied to a series RL circuit with R=25?. What will be the current in the circuit at twice the time constant ?
40. Sketch the current provided by i(t)=5-4e-20t.
41. A series RL circuit with R=10? and L=0.2H has a constant voltage V=50V applied at t=0. obtain the resulting current using the Laplace transform method.

Earning:   Approval pending.