Free Bachelor of Electrical Engineering Electric Circuits Questions and Answers — Questions and Answers

Question 1: Which of the following corresponds to a specific quantity?

Length (Correct answer)
Money
Polarity
Pressure

Correct answer: Length

A 'specific quantity' refers to a measurable physical property that has a definite unit. Length is a fundamental physical quantity, measured in units like meters, and is a direct, specific measurement. Money is an economic concept, and polarity is a characteristic (e.g., positive/negative) rather than a scalar quantity with magnitude and unit in the same way as length or pressure. While pressure is also a specific quantity, length is a more fundamental and universally understood example.

Question 2: The fundamental measure of light intensity is

Radian
Ampere
Candela (Correct answer)
Coulomb

Correct answer: Candela

Candela (cd) is the SI base unit of luminous intensity. It quantifies the power emitted by a light source in a particular direction, per unit solid angle, weighted by the luminosity function. This makes it the fundamental measure for how bright a light source appears to the human eye.

Question 3: Which of the following relationships is correct?

Tera>Giga>Mega (Correct answer)
Tera>Mega>Giga
Giga>Mega>Tera
Mega>Tera>Giga

Correct answer: Tera>Giga>Mega

These are standard SI prefixes used to denote multiples of units. Tera (T) represents 10^12, Giga (G) represents 10^9, and Mega (M) represents 10^6. Therefore, Tera is larger than Giga, and Giga is larger than Mega, establishing the correct descending order of magnitude.

Question 4: The charge is

Tripolar
Unipolar
Non – Polar in nature
Bipolar (Correct answer)

Correct answer: Bipolar

Electric charge exists in two fundamental forms: positive and negative. Objects can either have an excess of positive charge (protons) or negative charge (electrons). This dual nature, having two distinct poles or types, is why charge is described as bipolar.

Question 5: The symbol used to indicate Unbiased sources

Triangle
Circle (Correct answer)
Square
Diamond

Correct answer: Circle

In circuit diagrams, independent (unbiased) voltage and current sources are typically represented by a circle. A circle with a plus and minus sign indicates an independent voltage source, while a circle with an arrow indicates an independent current source. This convention distinguishes them from dependent sources, which are usually represented by diamonds.

Question 6: Positive power is defined as:

Power is being extracted from circuit
No power supply
Input and output powers are equal
Power is being delivered to circuit (Correct answer)

Correct answer: Power is being delivered to circuit

In circuit analysis, a common convention for positive power is that it signifies power being absorbed by or delivered *to* a component or circuit. Conversely, negative power often indicates that power is being supplied *by* the component (e.g., a source). This convention helps in consistently tracking energy flow within a system.

Question 7: The element of an inductor is .

Polar
Linear
Passive (Correct answer)
Active

Correct answer: Passive

An inductor is a passive circuit element because it can only absorb or store energy, not generate it. Passive elements like resistors, capacitors, and inductors do not require an external power source to operate and cannot amplify signals. Active elements, in contrast, can generate power or amplify signals.

Question 8: The ability of materials to obstruct the current flow is

Resistance (Correct answer)
Susceptance
Inductance
Conductance

Correct answer: Resistance

Resistance is the electrical property of a material that opposes the flow of electric current. It quantifies how much a material impedes the movement of charge carriers. Materials with high resistance are insulators, while those with low resistance are conductors.

Question 9: Dependent sources have been ____________ types.

1
2
3
4 (Correct answer)

Correct answer: 4

Dependent sources are classified into four types based on what controls them and what type of source they are. These are: voltage-controlled voltage source (VCVS), current-controlled voltage source (CCVS), voltage-controlled current source (VCCS), and current-controlled current source (CCCS). Each type represents a unique dependency relationship.

Question 10: When dealing with a dependent voltage/current source, its value is determined by .

Only on current sources
Only on voltage sources
Voltage/current sources of an external circuit
Voltage/current source present somewhere in the circuit (Correct answer)

Correct answer: Voltage/current source present somewhere in the circuit

Dependent sources, also known as controlled sources, have their output voltage or current determined by a voltage or current elsewhere within the *same* circuit. Unlike independent sources whose values are constant, a dependent source's value is a function of another circuit variable. This characteristic is crucial for modeling active devices like transistors.

Question 11: They are depending on some other source, as indicated by the name dependent. The amount of a voltage/current source present someplace in the circuit itself determines the value of a dependent voltage/current source. Which source in an ICVS is controlled and which one is dependent?

Both V and I are dependent
Both V and I are controllers
V-controller, I-dependent
V-dependent, I-controller (Correct answer)

Correct answer: V-dependent, I-controller

An ICVS typically refers to a Current-Controlled Voltage Source (CCVS). In this type of dependent source, the output voltage (V) is dependent on, or controlled by, a current (I) elsewhere in the circuit. Therefore, the voltage is the dependent quantity, and the current is the controller.

Question 12: What is dependent sources' alternate name?

Controlled sources (Correct answer)
Uncontrolled sources
Time response elements
Steady state elements

Correct answer: Controlled sources

Dependent sources are also widely known as controlled sources because their output (voltage or current) is controlled by another voltage or current elsewhere in the circuit. This terminology highlights their functional dependency on other circuit variables, distinguishing them from independent sources.

Question 13: The Superposition concept is upheld by .

Trilateral networks
Lateral networks
Non-linear networks
Linear networks (Correct answer)

Correct answer: Linear networks

The Superposition Theorem is a fundamental principle applicable only to linear circuits. It states that in a linear circuit with multiple independent sources, the total response (voltage or current) at any point is the sum of the responses caused by each independent source acting alone. This theorem relies on the properties of linearity, such as homogeneity and additivity.

Question 14: Where the voltage division issue appears

When resistors are equal
Series connected resistors (Correct answer)
Parallel connected resistors
Both series and parallel resistors.

Correct answer: Series connected resistors

Voltage division occurs when resistors are connected in series. In a series circuit, the total voltage across the combination is divided among the individual resistors in proportion to their resistance values. The current, however, remains the same through all series components.

Question 15: What causes the current divide issue

Parallel connected resistors (Correct answer)
When resistors are equal
Series connected resistors
Both series and parallel resistors.

Correct answer: Parallel connected resistors

Current division occurs when resistors are connected in parallel. In a parallel circuit, the total current entering the junction divides among the parallel branches. The current through each branch is inversely proportional to its resistance, while the voltage across all parallel components remains the same.

Question 16: What justifies the current division?

Because of Kirchhoff’s laws.
Because the voltage is also different
In series current is the same
In parallel current differs (Correct answer)

Correct answer: In parallel current differs

Current division is a direct consequence of Kirchhoff's Current Law (KCL) applied to parallel branches. When components are in parallel, they share the same voltage, but the total current splits among them. The amount of current flowing through each branch depends on its individual resistance, leading to different currents in different parallel paths.

Free Bachelor of Electrical Engineering Electric Circuits Questions and Answers

Which of the following corresponds to a specific quantity?