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Unit 1 - Practice Quiz

ECE131

1 Which of the following expressions correctly represents the relationship between current (), charge (), and time ()?

A.
B.
C.
D.

2 The energy stored in an inductor of inductance carrying a current is given by:

A.
B.
C.
D.

3 Which of the following statements regarding Ohm's Law is false?

A. It states that potential difference is directly proportional to current, provided temperature remains constant.
B. It is applicable to linear bilateral elements.
C. It is applicable to non-linear devices like diodes and Zener diodes.
D. The ratio represents resistance.

4 Kirchhoff’s Current Law (KCL) is a consequence of the law of conservation of:

A. Energy
B. Charge
C. Momentum
D. Flux

5 Kirchhoff’s Voltage Law (KVL) states that the algebraic sum of voltages around a closed path is zero. This is based on the conservation of:

A. Charge
B. Current
C. Energy
D. Power

6 Two resistors and are connected in parallel. What is the equivalent resistance ?

A.
B.
C.
D.

7 According to the Voltage Division Rule, the voltage drop across a resistor in a series circuit with , , and a total voltage source is:

A.
B.
C.
D.

8 Using the Current Division Rule for two parallel resistors and with a total entering current , the current flowing through is:

A.
B.
C.
D.

9 What is the internal resistance of an ideal voltage source?

A. Infinite
B. Zero
C. Very high
D. Dependent on the load

10 What is the internal resistance of an ideal current source?

A. Zero
B. 1 Ohm
C. Infinite
D. Negative

11 In a Star (Y) to Delta () transformation, if are the star-connected resistors connected to a neutral point, the equivalent Delta resistor between terminals A and B is:

A.
B.
C.
D.

12 Three equal resistors of value are connected in a Delta () configuration. What is the value of each resistor in the equivalent Star (Y) configuration?

A.
B.
C.
D.

13 Mesh analysis is primarily based on the application of:

A. Kirchhoff’s Current Law (KCL)
B. Kirchhoff’s Voltage Law (KVL)
C. Maximum Power Transfer Theorem
D. Current Division Rule

14 Nodal analysis is primarily based on the application of:

A. Kirchhoff’s Current Law (KCL)
B. Kirchhoff’s Voltage Law (KVL)
C. Superposition Theorem
D. Voltage Division Rule

15 A dependent source represented by a diamond shape with a +/- sign inside, controlled by a current elsewhere in the circuit, is known as a:

A. Voltage Controlled Voltage Source (VCVS)
B. Current Controlled Voltage Source (CCVS)
C. Voltage Controlled Current Source (VCCS)
D. Current Controlled Current Source (CCCS)

16 The Superposition Theorem is valid only for:

A. Linear networks
B. Non-linear networks
C. Unilateral networks
D. Networks with only one source

17 When applying the Superposition Theorem, how should ideal voltage sources be treated when they are 'turned off'?

A. Open circuited
B. Short circuited
C. Replaced by their internal resistance (infinity)
D. Left as is

18 When applying the Superposition Theorem, how should ideal current sources be treated when they are 'turned off'?

A. Open circuited
B. Short circuited
C. Replaced by a wire
D. Grounded

19 Thevenin’s Theorem states that any linear two-terminal circuit can be replaced by:

A. A single current source in parallel with a resistor
B. A single voltage source in parallel with a resistor
C. A single voltage source in series with a resistor
D. A single current source in series with a resistor

20 Norton’s Theorem states that any linear two-terminal circuit can be replaced by:

A. A single current source in parallel with a resistor
B. A single voltage source in parallel with a resistor
C. A single voltage source in series with a resistor
D. A single current source in series with a resistor

21 How are Thevenin resistance () and Norton resistance () related for the same network terminals?

A.
B.
C.
D.

22 To calculate the Thevenin voltage () across terminals A and B, you must find:

A. The short-circuit current between A and B
B. The open-circuit voltage across A and B
C. The resistance between A and B with sources active
D. The power dissipated between A and B

23 To calculate the Norton current () between terminals A and B, you must find:

A. The short-circuit current flowing between A and B
B. The open-circuit voltage across A and B
C. The current flowing when A and B are open
D. The voltage when A and B are shorted

24 The Maximum Power Transfer Theorem states that maximum power is transferred to the load resistance from a source with internal resistance when:

A.
B.
C.
D.

25 What is the efficiency of power transfer at the condition of Maximum Power Transfer?

A. 100%
B. 75%
C. 50%
D. 25%

26 If a Thevenin equivalent circuit has and , what is the value of the maximum power that can be delivered to a load?

A. 20 W
B. 5 W
C. 10 W
D. 50 W

27 What is the SI unit of conductance?

A. Ohm ()
B. Volt (V)
C. Siemens (S)
D. Henry (H)

28 Power consumed by a resistor is given by which of the following formulas?

A.
B.
C.
D. All of the above

29 In a series circuit containing , , and , what is the total resistance?

A.
B.
C.
D.

30 If a 10V source is connected across two resistors in parallel, what is the total current drawn from the source?

A. 1 A
B. 2 A
C. 4 A
D. 0.5 A

31 Which of the following is considered a 'bilateral' element?

A. Diode
B. Resistor
C. Transistor
D. Battery

32 What happens to the resistance of a metallic conductor when its temperature increases?

A. It decreases
B. It increases
C. It remains constant
D. It becomes zero

33 In a node with 3 branches, if 2A enters, 3A enters, and current leaves, what is the value of ?

A. 1 A
B. 5 A
C. -1 A
D. 6 A

34 A 'Supernode' is formed in Nodal analysis when:

A. A current source is between two non-reference nodes
B. A voltage source is connected between a non-reference node and the ground
C. A voltage source is connected between two non-reference nodes
D. A resistor is in parallel with a voltage source

35 If the voltage across a capacitor increases from 0V to 10V, the energy stored is:

A. 10 J
B. 20 J
C. 100 J
D. 200 J

36 The property of a circuit element to oppose the change in current flowing through it is called:

A. Resistance
B. Inductance
C. Capacitance
D. Conductance

37 In Source Transformation, a voltage source in series with resistance can be converted into:

A. A current source in series with
B. A current source in parallel with
C. A current source in parallel with
D. A current source in series with

38 If three resistors are connected in Delta, the equivalent Star resistance for each leg is:

A.
B.
C.
D.

39 A , lamp has a resistance of:

A.
B.
C.
D.

40 Which theorem is useful for analyzing a circuit when the load resistance varies, but the rest of the circuit remains constant?

A. Superposition Theorem
B. Thevenin’s Theorem
C. Mesh Analysis
D. KCL

41 If a circuit has nodes and branches, the number of independent KCL equations (nodal equations) required is:

A.
B.
C.
D.

42 If a circuit has nodes and branches, the number of independent KVL equations (mesh equations) required is:

A.
B.
C.
D.

43 A specific resistor in a circuit dissipates power when voltage source acts alone, and dissipates power when voltage source acts alone. Can we calculate total power as using Superposition?

A. Yes, superposition applies to power.
B. No, superposition does not apply to power.
C. Yes, if the sources are DC.
D. Yes, if the resistors are linear.

44 For a short circuit, the resistance and voltage are theoretically:

A.
B.
C.
D.

45 For an open circuit, the resistance and current are theoretically:

A.
B.
C.
D.

46 Which of the following is an active element?

A. Resistor
B. Capacitor
C. Inductor
D. Voltage Source

47 The time rate of change of work is defined as:

A. Energy
B. Power
C. Voltage
D. Force

48 In a series circuit, which quantity remains the same across all elements?

A. Voltage
B. Current
C. Power
D. None of the above

49 In a parallel circuit, which quantity remains the same across all parallel branches?

A. Voltage
B. Current
C. Power
D. Resistance

50 If a current of 2A flows through a resistor for 10 seconds, the charge transferred is:

A. 5 C
B. 20 C
C. 0.2 C
D. 12 C