Thursday, 14 February 2013
NETWORK THEORY PART-5
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63.What is transient state?
If a network contains energy storage elements, with change in excitation, the current and
voltages change from one state to other state.The behavior of the voltage or current when it is changed from one state to another state is called transient state.
64. What is transient time?
The time taken for the circuit to change from one steady state to another steady state is called transient time.
65.What is natural response?
If we consider a circuit containing storage elements which are independent of sources, the response depends upon the nature of the circuit, it is called natural response.
66. What is transient response?
The storage elements deliver their energy to the resistances, hence the response changes with time, gets saturated after sometime, and is referred to the transient response.
67.Define Laplace transform function.
The laplace transform of any time dependent functionf (t) is given by F (s).
Where S Acomplex frequency given by S = + jw
68.What is inverse Laplace transform?
Inverse Laplace Transform permits going back in the reverse direction i.e. from s domain to time domain.
69.Define time constant or RL Circuit.
The time taken to reach 63.2% of final value in a RL Circuit is called the time constant of RL circuit.
Time constant (t) = L / R
70. Define time constant of RC Circuit.
The time taken to reach 36.8% of initial current in an RC circuit is called the time constant of
RC circuit.Time constant (t) = RC.
71. What is meant by natural frequency?
If the damping is made zero then the response oscillates with natural frequency without any opposition,such a frequency is called natural frequency of oscillations, denoted as n.
72. Define damping ratio.
It is the ratio of actual resistance (R) in the circuit to the critical resistance (R cr).It is denoted by greek letter Zeta ( ).
73. Define initial value theorem.
The initial value theorem states that if f (t) and f’ (t) both are Laplace transformable,
Then
74. Define final value theorem.
The final value theorem states that, if f (t) and f ‘ (t) both are laplace transformable,
then
75. What is driving point impedence ?
The ratio of the Laplace transform of the voltage at the point to the laplace transform of the
current at the same port is called driving point impedance.
The driving point impedance of the network is define as
Z (S) = V(s) /I (s)
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