Electrical Engineering VIVA Questions

40 TOP MOST NETWORK ANALYSIS VIVA Questions and Answers

40 TOP MOST NETWORK ANALYSIS VIVA Questions and Answers

1.What is resistance?
the resistance is the property of a material to oppose the flow of current in a material.its unit is ohm.

2.What are the material used for resistor?
the material used are maganin (alloy of copper magnese and nickel),constantan(alloy of nickel and
copper).

3.what is inductance?
It is the property of a material by virtue of which it opposes any change of magnitude and direction of
current passing through the conductor.

4.what happens to voltage when current through the inductor is constant?
The voltage across inductor is zero.

5.how will you define capacitance?
It is the ability to store electric charge within it.Capacitance is a measure of charge per unit voltage
that can be stored in an element.

6.What happens to voltage when current is zero?
the voltage is constant.

7.When we use 3 terminal resistor?
It is used when resistance is less than 1 ohm.

8.what is the unit of charge and current?
the units are coulomb and ampere.

9.What are the properties of a resistor?
the properties are high resistivity ,resistance to oxidation, corrosion and moisture.

10.what is Q factor?
the Q factor is ratio of inductive reactance to resistance of a coil.

11.What are the material used for inductance coil?
the materials used are marble because it is unaffected by atmospheric conditions.

12.Which capacitor is preferred for high voltage and frequency?
The vaccum and gas filled capacitor are used for high voltage and frequency applications.

13.State Kirchoff current law?
The algebraic sum of currents at any node of a circuit is zero. The sum of incoming current is equal
to sum of outgoing current.

14.What are dependent sources?
When strength of voltage or current changes in the source for any change in the connected network
they are called dependent sources.

15.List examples of voltage source?
The examples of voltage source are battery and generator.

16.List examples of current sources?
semiconductor devices like transistor and diode are treated as current sources.

17.state Kirchoff voltage law?
Kirchoff voltage law states that the algebraic sum of all branch voltages around any closed loop of a
network is zero at all instant of time.

18.State TheveninTheorem?
This theorem states that any linear network with output terminal AB can be replaced by a single
voltage source V in series with a single impedance.

19.How equivalent impedance is calculated in TheveninTheorem?
All independent voltage sources are short circuited and all independent current sources are open
circuited.

20.What is the limitation of Kirchoffs law?
It fails in distributed parameter network.

21.State Nortons theorem?
This theorem states that any linear bilateral network with active network with output terminals AB
Can be replaced by a single current source in parallel with a single impedance Z..

22.Is the theorem applicable to ac sources?
No it is applicable to dc circuits with and without controlled sources.

23.Define Norton equivalent circuit?
The Norton equivalent circuit is a current generator which is placed in parallel to internal resistance.

24.State Superposition theorem?

  • If a number of voltages or current sources are acting simultaneously in a linear network the resultant
  • current in any branch is the algebraic sum of current that would be produced in it when each source acts
  • alone replacing all other independent sources by their internal resistances.

25.Sate Maximum power transfer theorem?
A resistance load being connected to a dc network receives maximum power when load resistance is
equal to internal resistance.

26.What is the efficiency during maximum power transfer?
50%.

27.Define branch?
It is a part of a network which lies between two junction points.

28.Define active and passive network?
The network which has no current or voltage source is called passive network.
The network which either has current or voltage source is called active network.

29.State Ohm’s Law?
The current through any conductor is directly proportional to the applied potential difference across it
keeping physical condition unchanged.

30.Define unilateral circuit?
A10 The circuit whose properties are not same in either direction is known as unilateral circuit.

31.Define filter?
A filter is an electrical network that can transmit signals within a specified frequency range.

32.List the characteristics of filter?
An ideal filter would transmit signals under the passband frequencies without attenuation and
completely suppress the signal with attenuation band of frequencies with a sharp cutt off profile.

33.Define characteristics impedance?
The characteristics impedance of a filter matches with circuit to which it is connected throughout the
pass band.

34.What is the unit of attenuation?
The unit is decibel and neper.

35.What are the application of filter?
the Filter is used in voice frequency telegraphy,multi channel communication, TV broadcasting and telephony.

36.Define active filter?
The active filter contains components like operational amplifier that introduce some gain in the signal.

37.List advantges of active filter over passive filter?
Active filter eliminate bulky components.It offer gain.It can drive low impedance loads.It is easy to
tune.

38.List the disadvantages of constant K filters?
The attenuation does not increase rapidly beyond cutt off frequency.
characteristics impedance varies widely in the pass band from desired value.

39.Define cuttoff frequency?
The frequency that seperates the pass and attenuation band is known as cutt off frequency.

40 How a band pass filter is constructed?
This filter is a combination of two parallel tuned circuit.This is a special type of LC filter alongwith a
particular BW frequency to be allowed through it.

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