ECE

NETWORK THEORY PART -2

16. What are dependent sources?
Dependent sources are those in which source voltage or current is not fixed, but is dependent on thevoltage or current existing at some other location in the circuit.

17.What are the different types of dependent or controlled sources?
1. Voltage Controlled Voltage Sources (VCVS)
2.Current Controlled Voltage Sources (CCVS)
3.Voltage Controlled Current Sources (VCCS)
4.Current Controlled Current Sources (CCCS)

18. What is resistance?
It is the property of a substance which opposes the flow of current through it. The resistance of element is denoted by the symbol “R”. It is measured in Ohms.

19. Write down the V-I relationship of circuit elements. 




20.What is average value?
It is defined as area under one complete cycle to period.
The average value of the sine wave is the total area under the half-cycle curve divided by
the distance of the curve.

         Average value  =    _Area under one complete cycle
                                                     Period


21. Define R.M.S. value.
The r.m.s value may be determined by taking the mean of the squares of the instantaneous value of current over one complete cycle.

             RMS    =      _(Area under hatched line) ²
                                             Period
22.Define form factor.
The ratio of RMS value to the average value is called the Form factor.

           Form factor (Kf)    =                _RMS value                
                                                           Average Value

23.Define peak factor.
Peak factor is defined as the ratio of the maximum value to the rms value.

       Peak Factor (Kp)          =          Maximum value     
                                                             RMS value

24.Define Ohm’s law.
The current flowing through the electric circuit is directly proportional to the potential difference across the circuit and inversely proportional to the resistance of the circuit, provided the temperature remains constant.

25.Define Kirchoff’s current law.
Kirchhoff’s current law states that in a node, sum of entering current is equal sum of leaving current.
I at junction point = 0

26.Define Kirchoff’s voltage law.
Kirchhoff’s Voltage Law (KVL) states that the algebraic sum of the voltages around any closed path is zero.
Around a closed path V= 0.

27. Two resistances with equal value of “R” are connected in series and parallel. What is the
equivalent resistance?

Resistance in series      R eq =   R1+R2

Resistance in parallel   R eq =        R1R2    
                                                          R1+R2

28. Two inductors with equal value of “L” are connected in series and parallel what is the
equivalent inductance?

Inductance in series       L eq = L1 + L2

Inductance in parallel    L eq =        L1L2                                                 
                                                          L1+L2

29. Two capacitors with equal value of “C” are connected in series and parallel. What is the
equivalent capacitance?

Capacitance in series   C eq =      C1C2     
                                                         C1+C2

Capacitance in parallel C eq =C1 + C2

30.Write down the formula for a star connected network is converted into a delta network?

RAB = RA+RB+ RA RB/RC

RBC =RB+RC+RB RC/RA

RAC=RA+RC+RA RC/RB

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