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network theorems ==

Network Theorems (ac) Glossary

Maximum power transfer theorem A theorem used to determine the load impedance necessary to ensure maximum power to the load.

Millman's theorem A method employing voltage-to-current source conversions that will permit the determination of unknown variables in a multiloop network.

Norton's theorem A theorem that permits the reduction of any two-terminal linear ac network to one having a single current source and parallel impedance. The resulting configuration can then be employed to determine a particular current or voltage in the original network or to examine the effects of a specific portion of the network on a particular variable.

Reciprocity theorem A theorem stating that for single-source networks, the magnitude of the current in any branch of a network, due to a single voltage source anywhere else in the network, will equal the magnitude of the current through the branch in which the source was originally located if the source is placed in the branch in which the current was originally measured.

Substitution theorem A theorem stating that if the voltage across and current through any branch of an ac bilateral network are known, the branch can be replaced by any combination of elements that will maintain the same voltage across and current through the chosen branch.

Superposition theorem A method of network analysis that permits considering the effects of each source independently. The resulting current and/or voltage is the phasor sum of the currents and/or voltages developed by each source independently.

Thévenin's theorem A theorem that permits the reduction of any two-terminal linear ac network to one having a single voltage source and series impedance. The resulting configuration can then be employed to determine a particular current or voltage in the original network or to examine the effects of a specific portion of the network on a particular variable.

Voltage-controlled voltage source (VCVS) A voltage source whose parameters are controlled by a voltage

questionpaper Home > Network Theorems (ac) > Fill In The Blanks > Network Theorems (ac) Fill In The Blanks

Select the best answer to complete the statement.

1 .      The Superposition Theorem ______________________ solving simultaneous linear equations. [Hint] eliminates the need for sets up equations for requires

2 .      The Superposition Theorem considers the effects of _______________________. [Hint] each source independently all sources combined multiple sources

3 .      To turn off sources, a voltage source is replaced by a/an __________ circuit and a current source is replaced by a/an _______________ circuit [Hint] short and open open and short open and open short and short

4 .      The current through or the voltage across a portion of the network produced by each source is ____________________ to find the total solution. [Hint] added algebraically added subtracted algebraically subtracted

5 .      The only variation in applying the Superposition Theorem to ac circuits is that ___________ and impedances are now a part of the situation. [Hint] phasors the angle of imaginary numbers real numbers

6 .      The Superposition Theorem ___________________ with power effects in ac networks. [Hint] is not applicable is applicable may be used

7 .      One of the _____________ applications of the Superposition Theorem is to electronic systems where the dc and ac analyses are treated separately. [Hint] most frequent occasional least likely few

8 .      The Superposition Theorem may be applied in a network with a dependent source in which the controlling variable _________ determined by the network to which the theorem is applied. [Hint] is not is

9 .      For dependent sources in which the controlling variable is determined by the network to which the Superposition Theorem is to be applied, the dependent source _____________ set to zero. [Hint] cannot be  can be   must be   may be

10 .      Thevenin's theorem states that any _________________ ac network can be replaced with an equivalent circuit consisting of a voltage source and an impedance in series. [Hint] two-terminal linear two-terminal non-linear linear non-linear

11 .      When applying Thevenin's theorem to a circuit with ___________________________, start by removing the portion of the network across which the Thevenin equivalent circuit is to be found. [Hint] an independent source a dependent source more than one dependent source

12 .      When applying Thevenin's theorem to a circuit with an independent source, after the step described in problem 11, the terminals should be ____________________. [Hint] clearly marked removed connected

13 .      To calculate ZTH, first _____________ all voltage and current sources. [Hint] remove short open

14 .      To find ETH, determine the _______________________ between the marked terminals. [Hint] open circuit voltage short circuit current short circuit voltage open circuit current

15 .      The final Thevenin's equivalent circuit is _________ with the portion of the circuit that was previously removed replaced between the terminals of the Thevenin's equivalent circuit. [Hint] drawn replaced combined

16 .      For ac circuits, the Thevenin impedance and Norton impedance ______________ the same. [Hint] are are not

17 .      The Norton and Thevenin equivalent is applicable at _________________ frequency/frequencies. [Hint] only one several all many

18 .      When applying Norton's theorem to a circuit with ___________________________, start by removing the portion of the network across which the Norton equivalent circuit is to be found. [Hint] an independent source a dependent source more than one dependent source

19 .      When applying Norton's theorem to a circuit with an independent source, after the step described in problem 18, the terminals should be ____________________. [Hint] clearly marked removed connected

20 .      The Norton current is found by calculating the ____________________ between the marked terminals. [Hint] short circuit current open circuit voltage source current

21 .      The Norton equivalent circuit is drawn with the portion of the circuit previously removed _____________ the terminals of the Norton equivalent circuit. [Hint] replaced between left open between

22 .      The Norton equivalent circuit and Thevenin equivalent circuit can be found from each other by using ______________________. [Hint] a source transformation Ohm's law Kirchhoff's law the voltage divider rule

23 .      Dependent sources in which the controlling variable is not determined by the network for which the Norton equivalent circuit is to be found ______________ the procedure for determining the equivalent circuit. [Hint] do not alter alter

24 .      Maximum power will be transferred to a load when the load impedance is ___________________ of the Thevenin impedance across its terminals. [Hint] the conjugate the mirror image the complement the opposite

25 .      When the load is properly chosen for maximum power transfer, the load will appear _______________. [Hint] totally resistive totally imaginary complex

key for answers

1.eliminates the need for 2.each source independently 3.short and open 4.added algebraically 5.phasors 6.is not applicable 7.most frequent 8.is not 9.cannot be 10.two-terminal linear 11.an independent source 12.clearly marked 13.remove 14.remove 15.drawn 16.are 17.only one 18.an independent source 19.clearly marked 20.short circuit current 21.replaced between 22.a source transformation 23.do not alter 24.the conjugate 25.totally resistive

THIS IS EDITED BY KRISHNA MOHAN (GUDLAVALLERU ENGG COLL)        FIRST B-TECH