##### 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.