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network theorems MCQs

Practise focused network theorems questions with marked answers for exam preparation and subject revision.

network theorems Mcqs

1. In Thevenins theorem, to find Z
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A. all independent voltage and current sources are short circuited

B. all independent voltage sources are short circuited and all independent current sources are open circuited

C. all independent voltage sources are open circuited and all independent current sources are short circuited

D. all independent current sources are short circuited and independent voltage sources are open circuited

2. A closed path made by several branches of the network is known as____________?
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A. branch

B. junction

C. loop

D. circuit

3. A capacitor is generally a____________?
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A. linear and bilateral component

B. bilateral and active component

C. non-linear and active component

D. active, passive, linear and nonlinear component

4. If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be___________?
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A. a voltage source

B. a current source

C. both of above

D. none of the above

5. Which of the following is a bilateral element?
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A. Constant current source

B. Capacitance

C. None of the above

D. Constant voltage source

6. The circuit whose properties are same in either direction is known as__________?
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A. reversible circuit

B. unilateral circuit

C. irreversible circuit

D. bilateral circuit

7. Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen from the terminals of the load. The above statement is associated with____________?
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A. Thevenins theorem

B. Maximum power transfer theorem

C. Millmans theorem

D. Superposition theorem

8. A non-linear network does not satisfy__________?
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A. superposition condition

B. homogeneity condition

C. both homogeneity as well as superposition condition

D. homogeneity, superposition and associative condition

9. Kirchhoff s current law states that
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A. total sum of currents meeting at the junction is zero

B. net current flow at the junction is positive

C. no current can leave the junction without some current entering it.

D. Hebraic sum of the currents meeting at the junction is zero

10. In a series parallel circuit, any two resistances in the same current path must be in___________?
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A. parallel with each other

B. series with the voltage source

C. parallel with the voltage source

D. series with each other

11. Application of Nortons theorem to a circuit yields:________________?
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A. equivalent current source and impedance in parallel

B. equivalent current source and impedance in series

C. equivalent impedance

D. equivalent current source

12. An ideal voltage source has__________?
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A. terminal voltage in proportion to current

B. zero internal resistance

C. open circuit voltage equal to the voltage on full load

D. terminal voltage in proportion to load

13. Kirchhoff s voltage law applies to circuits with____________?
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A. linear, non-linear, active and passive elements

B. linear elements only

C. nonlinear elements only

D. linear, non-linear, active, passive, time varying as wells as time-in-variant elements

14. Choose the incorrect statement: A branch formed by the parallel connection
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A. A branch formed by the parallel connection of any resistor R and open circuit has the characteristic of an open circuit.

B. A branch formed by the series connection of any resistor R and an open circuit has the characteristic of an open circuit.

C. A branch formed by the series connection of any resistor R and a short circuit has the characteristic of resistor R.

D. A branch formed by the parallel connection of any resistor R and a short circuit has the characteristic of a short circuit.

15. If resistance across LM in Fig. 2.30 is 15 ohms, the value of R is____________?
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A. 30 Q

B. 40 Q

C. 20 Q

D. 10 Q

16. According to Kirchhoffs voltage law, the algebraic sum of all IR drops and e.m.fs. in any closed loop of a network is always____________?
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A. zero

B. determined by battery e.m.fs.

C. negative

D. positive

17. Kirchhoff s law is applicable to____________?
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A. passive networks only

B. a.c. circuits only

C. d.c. circuits only

D. both a.c. as well d.c. circuits

18. An ideal voltage source should have______________?
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A. small value of e.m.f.

B. zero source resistance

C. infinite source resistance

D. large value of e.m.f.

19. For high efficiency of transfer of power, internal resistance of the source should be____________?
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A. less than the load resistance

B. more than the load resistance

C. none of the above

D. equal to the load resistance

20. Between the branch voltages of a loop the Kirchhoff s voltage law imposes_____________?
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A. none of the above

B. linear constraints

C. non-linear constraints

D. no constraints

21. While calculating Rth in Thevenins theorem and Norton equivalent
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A. only voltage sources are made dead

B. all voltage and current sources are made dead

C. only current sources are made dead

D. all independent sources are made dead

22. For a voltage source:
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A. None

B. terminal voltage is always lower than source e.m.f.

C. terminal voltage cannot be higher than source e.m.f.

D. the source e.m.f. and terminal voltage are equal

23. The superposition theorem requires as many circuits to be solved as there are____________?
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A. sources, nodes and meshes

B. sources and nodes

C. sources

D. nodes

24. The superposition theorem is applicable to____________?
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A. linear responses only

B. none of the above

C. linear, non-linear and time variant responses

D. linear and non-linear resistors only

25. In any linear bilateral network, if a source of e.m.f. E in any branch produces a current I in any other branch, then same e.m.f. acting in the second branch would produce the same current / in the first branch.
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A. above statement is associated with

B. compensation theorem

C. reciprocity theorem

D. none of the above

E. superposition theorem

26. A linear resistor having 0 < R < o is a______________?
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A. current controlled resistor

B. voltage controlled resistor

C. both current controlled and voltage controlled resistor

D. none of the above

27. A terminal where three on more branches meet is known as______________?
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A. combination

B. anode

C. node

D. terminus

28. Kirchhoff s law is not applicable to circuits with____________?
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A. lumped parameters

B. distributed parameters

C. passive elements

D. non-linear resistances

29. The concept on which Superposition theorem is based on_____________?
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A. duality

B. non-linearity

C. reciprocity

D. linearity

30. Which of the following is non-linear circuit parameter?
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A. Wire wound resistor

B. Transistor

C. Condenser

D. Inductance

31. The number of independent equations to solve a network is equal to_____________?
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A. the number of chords

B. the number of branches

C. sum of number of branches, chords and nodes

D. sum of the number of branches and chords

32. Millmans theorem yields____________?
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A. equivalent impedance

B. equivalent voltage source

C. equivalent resistance

D. equivalent voltage or current source

33. Which of the following is the passive element?
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A. Capacitance

B. Ideal voltage source

C. Ideal current source

D. All of the above

34. A network which contains one or more than one source of e.m.f. is known as___________?
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A. linear network

B. passive network

C. non-linear network

D. active network

35. A passive network is one which contains____________?
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A. no source of e.m.f. in it

B. only some sources of e.m.f. in it

C. only variable resistances

D. only two sources of e.m.f. in it

36. Efficiency of power transfer when maximum transfer of power c xerosis
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A. 75%

B. 50%

C. 100%

D. 80%

37. For maximum transfer of power, internal resistance of the source should be_____________?
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A. none of the above

B. equal to load resistance

C. less than the load resistance

D. greater than the load resistance

38. Thevenin resistance Rth is found
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A. by short-circuiting the given two terminals

B. by removing voltage sources along with their internal resistances

C. between same open terminals as for Etk

D. between any two open terminals

39. In any network containing more than one sources of e.m.f. the current in any branch is the algebraic sum of a number of individual fictitious currents (the number being equal to the number of sources of e.m.f.), each of which is due to separate action of each source of e.m.f., taken in order, when the remaining sources of e.m.f. are replaced by conductors, the resistances of which are equal to the internal resistances of the respective sources. The above statement is associated with:
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A. Nortons theorem

B. Superposition theorem

C. Thevenins theorem

D. None of the above

40. Kirchhoffs current law is applicable to only
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A. electric circuits

B. electronic circuits

C. closed loops in a network

D. junction in a network

41. Superposition theorem can be applied only to circuits having____________?
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A. resistive elements

B. passive elements

C. non-linear elements

D. linear bilateral elements

42. Kirchhoffs voltage law is related to_____________?
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A. junction currents

B. battery e.m.fs.

C. IR drops

D. both B. and C.

E. none of the above

43. The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as___________?
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A. non-linear circuit

B. linear circuit

C. bilateral circuit

D. none of the above

44. Any number of current sources in parallel may be replaced by a single current source whose current is the algebraic sum of individual source currents and source resistance is the parallel combination of individual source resistances. This statement is associated with:
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A. Millmans theorem

B. None of the above

C. Maximum power transfer theorem

D. Thevenins theorem

45. To determine the polarity of the voltage drop across a resistor, it is necessary to know___________?
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A. value of current through the resistor

B. direction of current through the resistor

C. value of resistor

D. e.m.fs. in the circuit

46. A star circuit has element of resistance R/2. The equivalent delta elements will be_____________?
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A. 2R

B. R/6

C. 4R

D. fi?

47. The resistance LM will be____________?
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A. 6.66 Q

B. 20Q

C. 12 Q

D. 18Q

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