1. Write the correct alternative answer.

Internal resistance of an ideal current source is

infinite

zero

very low

low

The relationship between voltage and current is same for two opposite directions of current. The network is

active

bilateral

unilateral

passive

A terminal where two or more than two branches meet is called

combination

terminus

anode

node

The current and power factor of a series resonant circuit is

maximum, zero

minimum, zero

maximum, unity

minimum, unity

A 100 uF capacitor is connected to a 100 volt d.c. supply. The capacitive reactance of the capacitor will be

10 ohm

1/10 ohm

infinite ohm

0 ohm

Thevenin's theorem is applicable to

d.c. circuit only

both a.c. and d.c. circuits

a.c. circuit only

None of the above

In a star connection, if each resistance is then in equivalent delta connection, this value will be

3R

R/3

R

6R

Using superposition theorem, determine the current through R3.

<img src='./qimages/11310-2a.jpg'>

State and prove the maximum power transfer theorem.

Derive the condition and find resonant frequency in a series RLC circuit. Also draw the phasor diagram at resonant condition.

An impedance of (8·66 ohm is connected in parallel with another impedance of ohm across a supply of (80 60) volts. Calculate the currents (I1 and I2) in each branch.

<img src='./qimages/11310-3b.jpg'>

Define quality factor, half power frequencies and bandwidth of a resonant circuit. Also draw the current
frequency/resonant curve and mark half power frequencies on it.

Draw the power triangle and define active,reactive and apparent power with their units. Also define power factor.

Find the star equivalent of the given delta connected network.

<img src='./qimages/11310-5a.jpg'>

Find the Norton's equivalent of the Thevenin's equivalent given below and find the value of current flowing through RL. connected across Norton's equivalent network.

<img src='./qimages/11310-5b.jpg'>

Explain Maxwell's loop analysis with the help of a suitable example and neat sketches.

A resistance R is connected in series with a parallel circuit comprising two resistances of 12 ohm and 8 ohm, respectively. The total power dissipated in the circuit is 70 watts when the applied voltage is 22 volts. Calculate R.

<img src='./qimages/11310-6b.jpg'>

7. Write short notes on any two of the following:

Duality and Dual Networks

Source Transformation

Concept of Phasor and Complex Impedance

Parallel Resonant Circuit