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
Solution : https://www.youtube.com/watch?v=UH5csZbXYgc
2005
2. The maximum power that can be transferred to the load resistor RL 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 Zs = Rs + j Xs delivers a maximum average power to a load impedance ZL when
a) ZL = Rs + jXs
b) ZL = Rs
c) ZL = jXs
d) ZL = Rs - jXs
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 ZTH 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 Zi = (1+2j) Ω feeds a load of impedance ZL = (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 RL maximizes the power delivered to RL?
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 RL such that the power transferred to RL is maximum.
a) 5 ohms
b) 10 ohms
c) 15 ohms
d) 20 ohms
Solution : https://www.youtube.com/watch?v=PIWsYGVUf0o
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 Vs(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 Vs = 100∟53.13o volts then the thevenin's equivalent voltage in volts as seen by the load resistance RL 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 Z1 of the first section to the input impedance Z2 of the second section is
a) Z2 = Z1
b) Z2 = – Z1
c) Z2 = Z1*
d) Z2 = – Z1*
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 Re.
The value of Re/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 RL 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
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 RL form the voltage source in figure is
a) 1 W
b) 10 W
c) 0.25 W
d) 0.5 W
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
2007
4. An independent voltage source in series with an impedance Zs = Rs + j Xs delivers a maximum average power to a load impedance ZL when
a) ZL = Rs + jXs
b) ZL = Rs
c) ZL = jXs
d) ZL = Rs - jXs
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
2008
6. The Thevenin’s equivalent impedance ZTH between the nodes P and Q in the following circuit is
2009
7. An AC source of RMS voltage 20 volts with internal impedance Zi = (1+2j) Ω feeds a load of impedance ZL = (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
8. In the circuit shown, what value of RL maximizes the power delivered to RL?
a) 2.4 Ω
b) 8/3 Ω
c) 4 Ω
d) 6 Ω
2011
9. In the circuit shown below, find the value of RL such that the power transferred to RL 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
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
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
2013
13. A source Vs(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
14. In the circuit shown below, if the source voltage Vs = 100∟53.13o volts then the thevenin's equivalent voltage in volts as seen by the load resistance RL is
2014
15. For maximum power transfer between two cascaded sections of an electrical network, the relationship between the output impedance Z1 of the first section to the input impedance Z2 of the second section is
a) Z2 = Z1
b) Z2 = – Z1
c) Z2 = Z1*
d) Z2 = – Z1*
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
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
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 _____________
19. The equivalent resistance in the infinite ladder network shown in the figure is Re.
The value of Re/R is ________________
2015
20. In the given circuit, the maximum power (in Watts) that can be transferred to the load RL is _______
21. In the circuit shown, the Norton equivalent resistance (in Ω) across terminals a and b is ________
22. For the current shown in the figure, the Thevenin’s equivalent voltage (in volts) across terminals a and b is _______________
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