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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 The SI unit of electrical resistance is the:

resistance Easy
A. Ohm ()
B. Farad ()
C. Volt ()
D. Ampere ()

2 The resistance of a conductor is directly proportional to its:

resistance Easy
A. Temperature coefficient only
B. Current through it
C. Cross-sectional area
D. Length

3 According to Ohm's law, the current through a resistor is given by:

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

4 A resistor carries a current of . The voltage across it is:

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

5 Voltage is best described as the:

voltage Easy
A. Potential difference between two points
B. Opposition to current flow
C. Stored electric charge
D. Rate of flow of charge

6 Electric current is defined as the rate of flow of:

current Easy
A. Energy
B. Voltage
C. Charge
D. Power

7 The SI unit of capacitance is the:

capacitance Easy
A. Farad ()
B. Coulomb ()
C. Ohm ()
D. Henry ()

8 The charge stored on a capacitor is given by:

capacitance Easy
A.
B.
C.
D.

9 The SI unit of inductance is the:

inductance Easy
A. Farad ()
B. Henry ()
C. Weber ()
D. Tesla ()

10 Electrical power dissipated in a resistor can be expressed as:

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

11 The unit of electrical energy is the:

power and energy concepts Easy
A. Ampere ()
B. Volt ()
C. Watt ()
D. Joule ()

12 Kirchhoff's Current Law (KCL) is based on the conservation of:

kirchhoff's laws Easy
A. Voltage
B. Energy
C. Power
D. Charge

13 Kirchhoff's Voltage Law (KVL) states that the algebraic sum of voltages around a closed loop is:

kirchhoff's laws Easy
A. Zero
B. Equal to the source voltage
C. Equal to the total current
D. Infinite

14 Three resistors of , , and are connected in series. The total resistance is:

intuitive method of circuit analysis- series and parallel simplification Easy
A.
B.
C.
D.

15 Two resistors connected in parallel give a total resistance of:

intuitive method of circuit analysis- series and parallel simplification Easy
A.
B.
C.
D.

16 In a series circuit, the voltage division rule states that the voltage across a resistor is proportional to:

voltage division rule Easy
A. Its own resistance
B. The reciprocal of its resistance
C. The total current squared
D. The source current only

17 In a parallel circuit, the current division rule shows that more current flows through the branch with:

current division rule Easy
A. Higher resistance
B. Larger inductance
C. Lower resistance
D. Longer wire length

18 A source whose output depends on a voltage or current elsewhere in the circuit is called a:

introduction to dependent and independent sources Easy
A. Independent source
B. Ideal source
C. Short circuit
D. Dependent source

19 According to the maximum power transfer theorem, maximum power is delivered to the load when the load resistance equals the:

maximum power transfer theorem Easy
A. Twice the source resistance
B. Source voltage
C. Source (Thevenin) resistance
D. Total circuit current

20 The superposition theorem is applicable only to circuits that are:

network theorems- superposition theorem Easy
A. Nonlinear
B. Linear
C. Open circuited
D. Purely capacitive

21 A resistor carries a current of when connected across a supply. If the voltage is increased to , what current flows through the same resistor?

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

22 Three resistors of , , and are connected in parallel. What is the equivalent resistance?

resistance Medium
A.
B.
C.
D.

23 A resistor dissipates of power. What is the current flowing through it?

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

24 Two capacitors of and are connected in series. What is the equivalent capacitance?

capacitance Medium
A.
B.
C.
D.

25 The voltage across an inductor of when the current changes at a rate of is:

inductance Medium
A.
B.
C.
D.

26 In a series circuit, a source is connected across resistors of and . What is the voltage across the resistor?

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

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

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

28 At a node, three currents enter: , , and , while one current leaves as . What is the magnitude of the second leaving current?

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

29 In a closed loop, the sum of EMF sources is . If two resistors drop and , what is the voltage drop across the third resistor?

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

30 A resistor is in series with a parallel combination of two resistors. What is the total resistance?

intuitive method of circuit analysis- series and parallel simplification Medium
A.
B.
C.
D.

31 Three equal resistors of are connected in delta. What is the resistance of each arm of the equivalent star network?

star–delta transformation Medium
A.
B.
C.
D.

32 Which of the following best describes a dependent source?

introduction to dependent and independent sources Medium
A. Its value is fixed regardless of circuit conditions
B. It supplies only alternating current
C. It can only absorb power, never deliver it
D. Its value is controlled by a voltage or current elsewhere in the circuit

33 For a planar circuit with branches and nodes, how many independent mesh equations are required?

mesh and nodal analysis Medium
A.
B.
C.
D.

34 In nodal analysis, how many node equations are needed for a circuit having nodes (including the reference node)?

mesh and nodal analysis Medium
A.
B.
C.
D.

35 A network has an open-circuit voltage of and delivers a short-circuit current of at its terminals. What is the Thevenin resistance?

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

36 A Thevenin equivalent has and . What is the Norton current of the equivalent circuit?

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

37 A source has Thevenin resistance and open-circuit voltage . What is the maximum power delivered to a matched load?

maximum power transfer theorem Medium
A.
B.
C.
D.

38 For maximum power transfer to a resistive load in a DC circuit, the load resistance should be:

maximum power transfer theorem Medium
A. Infinite
B. Equal to the Thevenin resistance of the source
C. Zero
D. Much larger than the source resistance

39 While applying the superposition theorem, an independent voltage source that is not being considered must be:

network theorems- superposition theorem Medium
A. Replaced by an open circuit
B. Doubled in value
C. Replaced by a short circuit
D. Left unchanged

40 A charge of flows through a conductor in minutes. What is the average current?

current Medium
A.
B.
C.
D.

41 A balanced delta network has three equal resistors of each. If this is converted to an equivalent star network, what is the value of each star resistor?

star–delta transformation Hard
A.
B.
C.
D.

42 A network has an open-circuit voltage of and delivers a short-circuit current of at its terminals. A load resistor is connected. What current flows through ?

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

43 A source with Thevenin voltage and internal resistance drives a variable load. What is the maximum power that can be delivered to the load?

maximum power transfer theorem Hard
A.
B.
C.
D.

44 In a linear circuit, a source alone produces in a branch, and a source alone produces in the same branch. With both sources active, what is the branch current?

network theorems- superposition theorem Hard
A.
B.
C.
D.

45 A two-node circuit (plus reference) has node equations: and (conductances in S, currents in A). What is ?

mesh and nodal analysis Hard
A.
B.
C.
D.

46 A total current of enters two parallel resistors and . What current flows through ?

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

47 Three resistors , , and are in series across a source. What voltage appears across the resistor?

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

48 At a node, three currents meet: entering, leaving, and unknown. If KCL holds and leaves the node, what is ?

kirchhoff's laws Hard
A.
B.
C.
D.

49 A Norton equivalent has and . A load of is connected. What power is dissipated in the load?

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

50 Two capacitors and are connected in series across . What is the charge stored on each capacitor?

capacitance Hard
A.
B.
C.
D.

51 The current through a inductor changes from to in . What is the magnitude of the induced EMF?

inductance Hard
A.
B.
C.
D.

52 A device operates for hours daily. What is the energy consumed in one week in kWh?

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

53 A wire of resistance is stretched uniformly to twice its original length (volume constant). What is its new resistance?

resistance Hard
A.
B.
C.
D.

54 A resistor dissipates when carrying . What voltage is across it?

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

55 Two resistors in parallel are placed in series with a resistor, and this combination is in parallel with a resistor. What is the total resistance?

intuitive method of circuit analysis- series and parallel simplification Hard
A.
B.
C.
D.

56 A circuit contains a current-controlled voltage source where is the current through a resistor carrying . What is the source voltage?

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

57 A circuit has nodes and branches. How many independent KVL (loop) equations are needed for complete analysis?

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

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

voltage Hard
A.
B.
C.
D.

59 A charge of passes through a conductor in minutes. What is the average current?

current Hard
A.
B.
C.
D.

60 A two-mesh circuit yields: and . What is the mesh current ?

mesh and nodal analysis Hard
A.
B.
C.
D.
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Unit 2