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Unit 1: Fundamentals of D.C. circuits - Practice Quiz

ECE131 — Basic Electrical And Electronics Engineering 60 Questions
0 Correct 0 Wrong 60 Left
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1 What is the SI unit of electrical resistance?

Resistance Easy
A. Farad
B. Ampere
C. Ohm
D. Henry

2 Which circuit element opposes a sudden change in current?

Inductance Easy
A. Voltage source
B. Resistor
C. Inductor
D. Capacitor

3 Which circuit element stores energy in an electric field?

Capacitance Easy
A. Current source
B. Capacitor
C. Resistor
D. Inductor

4 Voltage is best described as which electrical quantity?

Voltage Easy
A. Potential difference
B. Charge flow rate
C. Power consumption
D. Current opposition

5 What is the SI unit of electric current?

Current Easy
A. Watt
B. Ampere
C. Coulomb
D. Volt

6 A device operates at and draws . What power does it consume?

Power and energy concepts Easy
A.
B.
C.
D.

7 A resistor carries a current of . What is the voltage across it?

Ohm's law Easy
A.
B.
C.
D.

8 According to Kirchhoff's Current Law, what is true at a circuit node?

Kirchhoff's laws Easy
A. Power equals stored energy
B. Entering current equals leaving current
C. Resistance equals total current
D. Entering voltage equals leaving voltage

9 What is usually the first step when analyzing a simple DC circuit?

Basic method of circuit analysis Easy
A. Identify elements and connections
B. Replace every source
C. Assume zero current
D. Remove every resistor

10 What is the equivalent resistance of two resistors connected in parallel?

Series and parallel simplification Easy
A.
B.
C.
D.

11 Two resistors, and , are in series across . What is the voltage across the resistor?

Voltage division rule Easy
A.
B.
C.
D.

12 A total current of enters two equal parallel resistors. What current flows through each resistor?

Current division rule Easy
A.
B.
C.
D.

13 Why is a star-delta transformation used in circuit analysis?

Star-delta transformation Easy
A. To simplify resistor networks
B. To increase source voltage
C. To measure electric charge
D. To convert DC into AC

14 Which statement correctly describes an independent voltage source?

Introduction to dependent and independent sources Easy
A. Its resistance is always infinite
B. Its current is always zero
C. Its voltage depends on circuit current
D. Its voltage is specified independently

15 Mesh analysis primarily applies Kirchhoff's Voltage Law to what part of a planar circuit?

Mesh analysis Easy
A. Independent loops
B. Essential nodes
C. Parallel branches
D. Open terminals

16 In nodal analysis, circuit voltages are normally measured relative to which point?

Nodal analysis Easy
A. Output branch
B. Current source
C. Reference node
D. Largest resistor

17 What components form a Thevenin equivalent circuit?

Thevenin's theorem Easy
A. One voltage source and one series resistance
B. Two current sources and one inductor
C. Two voltage sources and one capacitor
D. One current source and one series resistance

18 What components form a Norton equivalent circuit?

Norton's theorem Easy
A. Two current sources and one capacitor
B. Two voltage sources and one inductor
C. One current source and one parallel resistance
D. One voltage source and one parallel resistance

19 For a resistive DC circuit, when is maximum power delivered to the load?

Maximum power transfer theorem Easy
A. When
B. When
C. When
D. When

20 When applying superposition, how is an ideal independent voltage source deactivated?

Superposition theorem Easy
A. Replace it with an open circuit
B. Replace it with a short circuit
C. Replace it with a capacitor
D. Replace it with a current source

21 A copper wire has a resistance of . It is stretched uniformly to twice its original length without changing its volume. Assuming resistivity remains constant, what is its new resistance?

Resistance Medium
A.
B.
C.
D.

22 The current through a inductor increases uniformly from to in . What is the magnitude of the induced voltage?

Inductance Medium
A.
B.
C.
D.

23 A capacitor charged to is connected in parallel with an uncharged capacitor. What is the final common voltage, assuming no energy is supplied externally?

Capacitance Medium
A.
B.
C.
D.

24 Moving a charge of between two points requires of work. What is the potential difference between the points?

Voltage Medium
A.
B.
C.
D.

25 The charge passing through a conductor is described by coulombs. What is the current at ?

Current Medium
A.
B.
C.
D.

26 A resistor carries a constant current of for minutes. How much electrical energy is converted into heat?

Power and energy concepts Medium
A.
B.
C.
D.

27 A resistor draws when connected to . If the voltage is increased to while its resistance remains constant, what current will it draw?

Ohm's law Medium
A.
B.
C.
D.

28 At a node, currents of and enter, while currents of and leave. What is the value of ?

Kirchhoff's laws Medium
A.
B.
C.
D.

29 A resistor and a resistor are connected in parallel. This combination is connected in series with a resistor. What is the equivalent resistance?

Series and parallel simplification Medium
A.
B.
C.
D.

30 Three resistors of , , and are connected in series across a supply. What is the voltage across the resistor?

Voltage division rule Medium
A.
B.
C.
D.

31 A total current of enters two parallel resistors of and . What current flows through the resistor?

Current division rule Medium
A.
B.
C.
D.

32 A balanced delta network has a resistance of in each branch. What is the resistance of each branch of its equivalent star network?

Star-delta transformation Medium
A.
B.
C.
D.

33 A voltage-controlled current source has the value . If the controlling voltage is , what current does the source provide?

Introduction to dependent and independent sources Medium
A.
B.
C.
D.

34 Two clockwise mesh currents and share a resistor. The left mesh also contains a resistor and a source that supports . If , what is ?

Mesh analysis Medium
A.
B.
C.
D.

35 A node of voltage is connected to ground through and to a fixed node through . A current source injects current from ground into the node. What is ?

Nodal analysis Medium
A.
B.
C.
D.

36 A network seen from two terminals has an open-circuit voltage of . When the terminals are shorted, the current is . What is its Thevenin equivalent?

Thevenin's theorem Medium
A. in series with
B. in series with
C. in series with
D. in series with

37 A circuit has a Thevenin equivalent of in series with . What is the corresponding Norton equivalent?

Norton's theorem Medium
A. in parallel with
B. in parallel with
C. in parallel with
D. in parallel with

38 A linear DC network has a Thevenin equivalent of in series with . What load resistance gives maximum power, and what is that maximum power?

Maximum power transfer theorem Medium
A. ,
B. ,
C. ,
D. ,

39 In a linear circuit, a branch current is clockwise when only source 1 acts and counterclockwise when only source 2 acts. What is the branch current when both sources act?

Superposition theorem Medium
A. clockwise
B. clockwise
C. counterclockwise
D. counterclockwise

40 A source is connected across a network consisting of a resistor in series with a parallel combination of and . What current is supplied by the source?

Basic method of circuit analysis Medium
A.
B.
C.
D.

41 Twelve identical resistors, each of resistance , form the edges of a cube. What is the equivalent resistance measured between two diagonally opposite vertices of the cube?

Resistance Hard
A.
B.
C.
D.

42 A ideal inductor has initial current . For , its voltage, referenced according to the passive sign convention, is . What is ?

Inductance Hard
A.
B.
C.
D.

43 A capacitor is charged to and a capacitor is charged to with opposite polarity. They are disconnected from their sources and connected in parallel with like-labeled terminals joined. What are the final voltage and the energy dissipated during charge redistribution?

Capacitance Hard
A. and
B. and
C. and
D. and

44 A ideal voltage source, a resistor, and a ideal current source are connected in parallel. Both sources have their positive or upward-delivery direction toward the top node. What power is absorbed by the voltage source?

Voltage Hard
A.
B.
C.
D.

45 A current flows through a conductor for . Which pair gives the total charge transported and the maximum current?

Current Hard
A. and
B. and
C. and
D. and

46 An element has across it and leaving its positive-voltage terminal for . How much net energy does the element deliver over this interval?

Power and energy concepts Hard
A.
B.
C.
D.

47 A resistor obeys , where is in degrees Celsius. Its steady temperature satisfies , where is its power in watts. When connected across an ideal source, what is the steady current?

Ohm's law Hard
A.
B.
C.
D.

48 A connected circuit graph has nodes and branches. One additional branch is connected between two existing nodes without creating a new node. How do the numbers of independent KCL and KVL equations change?

Kirchhoff's laws Hard
A. KCL increases from to ; KVL remains
B. KCL remains ; KVL increases from to
C. KCL remains ; KVL increases from to
D. KCL increases from to ; KVL increases from to

49 A node is connected through to a node, through to a node, and through to ground. A current source also points from node toward ground. What is ?

Intuitive method of circuit analysis Hard
A.
B.
C.
D.

50 An infinite ladder begins with a series resistor . At the following node, a resistor is connected to ground in parallel with an identical continuation of the entire ladder. What is the input resistance?

Series and parallel simplification Hard
A.
B.
C.
D.

51 A source with internal resistance feeds an upper divider resistor and a lower divider resistor. A voltmeter of resistance measures the lower-resistor voltage. What are the measured voltage and the voltage after the meter is removed?

Voltage division rule Hard
A. and
B. and
C. and
D. and

52 A current enters the top node of three parallel branches. The branches are a resistor, a resistor in series with a source whose positive terminal is at the top, and a resistor. What current flows downward in the branch?

Current division rule Hard
A.
B.
C.
D.

53 A delta network has resistances , , and . What are the equivalent star resistances ?

Star-delta transformation Hard
A.
B.
C.
D.

54 A node of voltage is connected to ground through a resistor and a voltage-controlled current source of value directed from the node to ground. An independent source injects current from ground into the node. What are and the power absorbed by the dependent source?

Introduction to dependent and independent sources Hard
A. and
B. and
C. and
D. and

55 Two clockwise meshes share a current source directed upward in their common branch. The left and right outer branches contain and resistors, respectively. A source on the outer perimeter supplies a voltage rise in the clockwise supermesh direction. What are the mesh currents ?

Mesh analysis Hard
A.
B.
C.
D.

56 Nodes and form a supernode with an ideal source imposing . Node is connected to ground through and receives from a ground-to-node current source. Node is connected to ground through . What current flows through the voltage source from to ?

Nodal analysis Hard
A.
B.
C.
D.

57 A one-port has a resistor from a node to its output terminal, a resistor from the output to ground, and a dependent current source from ground to the output of value . Here is the current through the resistor directed toward the output. What is the Thevenin equivalent at the output?

Thevenin's theorem Hard
A.
B.
C.
D.

58 At a one-port, an source with its negative terminal grounded connects its positive terminal to the port through . The port also connects to ground through and through a current source directed from the port to ground. What is the Norton equivalent, with Norton current referenced from the port to ground?

Norton's theorem Hard
A.
B.
C.
D.

59 A Thevenin source with supplies a load consisting of a variable resistor in parallel with a fixed resistor. For what value of is the power absorbed by the variable resistor maximized, and what is that maximum power?

Maximum power transfer theorem Hard
A. and
B. and
C. and
D. and

60 A node is connected to ground through a load, to a node through , and to a node through . Using superposition correctly, what are the load-voltage contributions from the and sources, respectively, and the final load power?

Superposition theorem Hard
A.
B.
C.
D.
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Unit 2