Kirchhoff's law is applicable to AC circuits only

(ii) DC circuits only

(iii) AC as well as DC circuits
Passive networks only

Choose the correct answer.

1.(b) Power factor of pure inductor is unity

(ii) zero

(iii) infinite
0·707 lagging

Choose the correct answer.

1.(c) A close path made by several branches of the network is known as circuit

(ii) branch

(iii) junction
loop

Choose the correct answer.

1.(d) Power factor of a series resonating circuit is
unity

(ii) zero

(iii) 0.707 lagging
0.707leading

Choose the correct answer.

1.(e) As per maximum power transfer theorem, the internal resistance of a circuit should be equal to for maximum power transfer to load. cell resistance

(ii) load resistance

(iii) load inductance
load capacitance

Choose the correct answer.

1.(f) In a circuit, the current is 10L-30° amp. Nature of the current is leading

(ii) lagging

(iii) in phase with voltage
All of the above

Choose the correct answer.

1.(g) Resistance of a 100 watt 200 volt lamp is 100 ohm

(ii) 200 ohm

(iii) 400 ohm
1600 ohm

Choose the correct answer.

2.(a) State and explain Kirchhoff's voltage law with the help of an example.

2.(b) Find out the current through the 0·1 ohm resistor, using Thevenin's theorem.
<br><br> <img src='./qimages/13264-2b.jpg'> State and explain nodal analysis with the help of a suitable example.

3.(b) State, prove and explain maximum power transfer theorem.

4.(a) State the condition of series resonance. Also define and derive the Quality factor of a series resonant circuit.

4.(b) A coil of resistance 100 ohm and inductance 100 mH is connected in series with a 100 pF capacitor. The circuit is connected to a 10 volt variable frequency source. Calculate the resonant frequency,
the current at resonance, and

(iii) Q-factor of the circuit.

5.(a) Explain power triangle and impedance triangle. Also give the formula and units of real, imaginary and apparent power in case of an a.c. circuit.

5.(b) A resistance of 20 ohm is in series with an inductance of 0·1 henry with the terminal voltage of 230 volt 50 Hz. Find the value of current. Also calculate the phase angle between voltage and current.

6.(a) State and explain Superposition theorem with the help of suitable diagrams.

6.(b) Using Norton's theorem, determine the current in the 10 ohm resistor of the given network.
<br><br> <img src='./qimages/13264-6b.jpg'> Write short notes on Delta Star Transformation

7.(b) Write short notes on Nodal Analysis

7.(c) Write short notes on Parallel Resonance

7.(d) Write short notes on Duality and Dual Networks