## Network Analysis Past Papers 1

Paper: Network Analysis

Time Allowed:3 hours

Examination:

Total Marks:70, Passing Marks (35)

Q1: Choose the suitable option.

- The resistivity of the conductor depends on
- area of the conductor length of the conductor
- type of material none of these.

- The unit of resistivity is
- Ω Ω – metre c. Ω / metre d. Ω / m².

- The reactance curve is a plot of frequency versus _________ for a series RLC circuit
- Current b. Voltage c. Gain d. Impedance

- The internal resistance of an ideal current source is
- Infinite b. Zero c. Equal to the load resistance d. To be determined
- The unit of inductance is
- Farad b. Daraf c. Siemen d. Henry
- The unit of capacitance is
- Farad b. Daraf c. Siemen d. Henry
- Nodal analysis can be applied for
- planar networks. non planar networks
- both planar and non planar networks. d. neither planar and non planar networks.
- Which quantity should be measured by the voltmeter?
- Current voltage c. power d. speed

- Kwh is unit of
- Power Current c. voltage d. Energy

- KVL works on the principle of
- law of conservation of charge. law of conservation of energy.
- both. d. None of the above.

Q2: Differentiate between Self Induction and Mutual induction.

Q3: a) Differentiate between single phase and 3-phase.

- b) Draw the diagram showing sinusoids of current and voltage in
- i) Pure inductive ii) Pure capacitive circuit.

Q4: a) Explain resistance, inductive reactance and capacitive reactance. Also write the equation for impedance.

- b) Differentiate between First order and 2
^{nd}order circuit. Also draw their diagrams.

Q5: For the circuit shown below, find the currents , and using KVL method and Crammer rule.

Q6: Explain and differentiate between active, reactive and apparent power.

Q7: Solve the circuit by nodal analysis and find Va.

## Network Analysis Past Papers 2

Paper: Network Analysis

Time Allowed:3 hours

Examination:

Total Marks:70, Passing Marks (35)

**Q.1 True/False. (14) **

- The power factor of a circuit can be determined without any known voltages or currents.

**b**. The total of the voltage drop in a series RL or RC circuit must be found using vectors.

** **

- All voltage sources and batteries have some internal resistance.

** **

- Norton equivalent circuits can be converted to Thevenin equivalent circuits..

** **

- If the equivalent resistance and total current of a parallel branch are known, the voltage drop across the parallel branch can be found.

** **

- The power dissipated in a shorted resistor is zero watts.

- It is possible to have a greater voltage across a capacitor in an RLC series circuit than the source voltage.

** **

** **

**Q.2 **What is Power factor? What are the causes of Low power Factor? **(14) **

**Q.3 **What are the techniques that we can improve power factor? **(14) ** ** **

**Q.4** Explain Unit step and Impulse responce funtion with the help of circuit diagram? **(14)** ** **

**Q.5 **What are the Different application of nodal analysis in matrices? **(14) **

** ** ** **

**Q.6** Explain RL, RC and RLC circuits with the help of circuit diagrams? **(14)**

**Q.7** What is Thevenin Theorem? Write down the different steps of Thevenin Theorem? **(14)**

** **

**Q.8 **Write short notes on any two of the following **(7+7)**

(a)RMS b) Voltage c) Power* *

## Network Analysis Important questions in Past Papers 3

Paper: Network Analysis

Time Allowed:3 hours

Examination:

Total Marks:70, Passing Marks (35)

Q.1: True and false. (14)

- The peak factor of a wave is the ratio of Max value to the Average value True/false

b . The rms value of AC is related to peak value of AC by the equation Irms =0.707I max. True/false

- The form factor of DC supply voltage is always unity True/false
- Unit of inductance is farad True/false

e . Capacitor allows both AC & DC to pass True/false

- Ohm’s law is not applicable to semiconductors True/false
- Kirchhoff, s voltage law is based on law of conservation of energy. True/false

Q.2: a: Define Kirchhoff’s law (4)

b: For the network junction shown in fig1 calculate the current I3 given that I1= 3A, I2 =- 4A, I4=2A

(10)

Q.3: A voltage divider is to give an output voltage of 20V from an input voltage of 40V as shown in fig2 .given that R2 = 100 ohm calculate resistance of R1.

Q.4: An alternating voltage has the equation V = 141.4 sin 377t .Find the value of the following (14)

a : rms voltage b : Average voltage

c : Max voltage d : frequency

Q.5: A pure inductance of 318mH is connected in series with a pure resistance of 75 ohm as shown in fig 3.the circuit is supplied from a 50 Hz sinusoidal source and the voltage across the 75 ohm resistor is found to be 150v,calculate the supply voltage. (14)

Q.6: A circuit having a resistance of 12 ohm an inductance of 0.15H and a capacitance of 100 micro farad in series is connected across a 100V supply

calculate (a): the impedance (b): the current (c) : voltage across R ,L & C. (d) phase impedance between current & voltage. (14)

Q.7 (a) Explain active ,reactive and apparent power (7)

(b) A coil having a resistance of 6 ohm and inductance of 0.03H is connected Across a 50V .60Hz

supply. Find (7)

(a) : the current (b) : Apparent power (c) : Active power.

Q.8: A ferromagnetic ring of cross sectional area 800 mm sq and of mean radius 170 mm has two winding connected in series , one of 500 turns and one of 700 turns .if the relative permeability is 1200,calculate the self inductance of each coil and the mutual inductance of each assuming that there is no flux leakage.

(14)

## Network Analysis Guess Papers 4

Paper: Network Analysis

Time Allowed:3 hours

Examination:

Total Marks:70, Passing Marks (35)

Q1. Express in rectangular and polar notations, the impedance of each of the following circuits at a frequency of 50 Hz:

(a) a resistance of 20 Ω in series with an inductance of 0.1 H;

(b) a resistance of 50 Ω in series with a capacitance of 40 µF;

(c) circuits (a) and (b) in series.

If the terminal voltage is 230 V at 50 Hz, calculate the value of the current in each case and the phase of each current relative to the applied voltage.

Q2. Find the condition for the transfer of maximum power by the source.

Q3. An alternating voltage has the equation v =141.4 sin 377t; what are the values of:

(a) r.m.s. voltage;

(b) Frequency;

(c) The instantaneous voltage when t =3 ms?

Q4. Calculate the output voltage *Vo* in the circuit of Fig. 1 using nodal analysis.

Q5. Explain mutual induction and discuss the dot convention used in transformer.

Q6. Write note on the following.

- Magnetic Coupling
- Coefficient of Coupling

Q7. What do you understand by the term power factor? What is the practical importance of power factor?

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