**2003**

1. A source of angular frequency 1 rad/sec has source impedance consisting of 1 Ω resistance in series with 1 H inductance. The load that will obtain the maximum power transfer is

a) 1 Ω resistance

b) 1 Ω resistance in parallel with 1 H inductance

c) 1 Ω resistance in series with 1 F capacitor

d) 1 Ω resistance in parallel with 1 F capacitor

**2005**

2. The maximum power that can be transferred to the load resistor R

_{L}form the voltage source in figure is

a) 1 W

b) 10 W

c) 0.25 W

d) 0.5 W

**Solution :**https://www.youtube.com/watch?v=IW9o-PZYI6E

3. For the circuit shown in figure, Thevenin's voltage and Thevenin's equivalent resistance at terminals a-b is

a) 5 V and 2 Ω

b) 7.5 V and 2.5 Ω

c) 4 V and 2 Ω

d) 3 V and 2.5 Ω

**Solution :**https://www.youtube.com/watch?v=wlcChf7gBWE

**2007**

4. An independent voltage source in series with an impedance Z

_{s}= R

_{s}+ j X

_{s}delivers a maximum average power to a load impedance Z

_{L}when

a) Z

_{L}= R

_{s}+ jX

_{s}

b) Z

_{L}= R

_{s}

c) Z

_{L}= jX

_{s}

d) Z

_{L}= R

_{s}- jX

_{s}

**Solution :**https://www.youtube.com/watch?v=o9Awvha9eAg

5. For the circuit shown in the figure, the Thevenin's voltage and resistance looking into X-Y are

a) 4/3 volts. 2 Ω

b) 4 volts. 2/3 Ω

c) 4/3 volts. 2/3 Ω

d) 4/ volts. 2 Ω

**Solution :**https://www.youtube.com/watch?v=M9_ZDSgAKLI

**2008**

6. The Thevenin’s equivalent impedance Z

_{TH}between the nodes P and Q in the following circuit is

**Solution :**https://www.youtube.com/watch?v=vl6exaG9eY0

**2009**

7. An AC source of RMS voltage 20 volts with internal impedance Z

_{i}= (1+2j) Ω feeds a load of impedance Z

_{L}= (7+4j) Ω in the figure below. The reactive power consumed by the load is

a) 8 VAR

b) 16 VAR

c) 28 VAR

d) 32 VAR

**Solution :**https://www.youtube.com/watch?v=w36Rox8j0KA

8. In the circuit shown, what value of R

_{L}maximizes the power delivered to R

_{L}?

a) 2.4 Ω

b) 8/3 Ω

c) 4 Ω

d) 6 Ω

**Solution :**https://www.youtube.com/watch?v=yqt0czRs6_I

**2011**

9. In the circuit shown below, find the value of R

_{L}such that the power transferred to R

_{L}is maximum.

a) 5 ohms

b) 10 ohms

c) 15 ohms

d) 20 ohms

**2012**

10. The average power delivered to an impedance (4-j3)Ω by a current 5cos(100πt+100) Amp is

a) 44.2 W

b) 50 W

c) 62.5 W

d) 125 W

**Solution :**https://www.youtube.com/watch?v=WMAyaRN-XxU

11. The impedance looking into nodes 1 and 2 in the given circuit is

a) 50 Ω

b) 100 Ω

c) 5 kΩ

d) 10.1 kΩ

**Solution :**https://www.youtube.com/watch?v=M7px_ck8xa4

12. Assuming both the voltage sources are in phase, the value of R for which maximum power is transferred from circuit A to circuit B is

a) 0.8 Ω

b) 1.4 Ω

c) 2 Ω

d) 2.8 Ω

**Solution :**https://www.youtube.com/watch?v=RYUCtIAHMkE

**2013**

13. A source V

_{s}(t) = V cos100πt has an internal impedance of (4 + j3) Ω. If a purely resistive load connected to this source has to extract the maximum power out of the source, its value in Ω should be

a) 3

b) 4

c) 5

d) 7

**Solution :**https://www.youtube.com/watch?v=_a3PEIDOI08

14. In the circuit shown below, if the source voltage V

_{s}= 100∟53.13

^{o}volts then the thevenin's equivalent voltage in volts as seen by the load resistance R

_{L}is

**Solution :**https://www.youtube.com/watch?v=XnD2y6tMyFM

**2014**

15. For maximum power transfer between two cascaded sections of an electrical network, the relationship between the output impedance Z

_{1}of the first section to the input impedance Z

_{2}of the second section is

a) Z

_{2}= Z

_{1}

b) Z

_{2}= – Z

_{1}

c) Z

_{2}= Z

_{1}

^{*}

d) Z

_{2}= – Z

_{1}

^{*}

**Solution :**https://www.youtube.com/watch?v=vK_w7K2D-9M

16. A 230 volts rms source supplies power to two loads connected in parallel. The first load draws 10kW at 0.8 leading power factor and the second one draws 10 kVA at 0.8 lagging power factor. The complex power delivered by the source is

a) (18 + j 1.5) kVA

b) (18 – j 1.5) kVA

c) (20 + j 1.5) kVA

d) (20 – j 1.5) kVA

**Solution :**https://www.youtube.com/watch?v=XF8e5rYmmm8

17. Norton's theorem states that a complex network connected to a load can be replaced with an equivalence impedance

a) in series with a current source

b) in parallel with a voltage source

c) in series with a voltage source

d) in parallel with a current source

**Solution :**https://www.youtube.com/watch?v=z8p5iNyHA60

18. In the circuit shown in the figure, the angular frequency ω (in rad/sec), at which the Norton equivalent impedance as seen from terminals b – b' is purely resistive, is _____________

**Solution :**https://www.youtube.com/watch?v=doL-VE7tziY

19. The equivalent resistance in the infinite ladder network shown in the figure is R

_{e}.

The value of R

_{e}/R is ________________

**Solution :**https://www.youtube.com/watch?v=UeUdAyWscyI

2015

20. In the given circuit, the maximum power (in Watts) that can be transferred to the load R

_{L}is _______

**Solution :**https://www.youtube.com/watch?v=Hr4AS712hRM

21. In the circuit shown, the Norton equivalent resistance (in Ω) across terminals a and b is ________

**Solution :**https://www.youtube.com/watch?v=w8z1zeVVm1c

22. For the current shown in the figure, the Thevenin’s equivalent voltage (in volts) across terminals a and b is _______________

**Solution :**https://www.youtube.com/watch?v=JNhFCs7jQiM

Thanku very much. This has been very useful.

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