Electrical & Electronics Engineering MCQ & Objective Questions
Electrical & Electronics Engineering is a crucial subject for students aiming to excel in their school and competitive exams. Mastering this field not only enhances your understanding of fundamental concepts but also significantly boosts your exam scores. Practicing MCQs and objective questions is an effective way to prepare, as it helps you identify important questions and solidify your knowledge through targeted practice.
What You Will Practise Here
Fundamental concepts of electrical circuits and components
Key principles of electronics, including diodes and transistors
Important formulas related to Ohm's Law and Kirchhoff's Laws
Basic definitions and applications of AC and DC systems
Understanding of signal processing and communication systems
Diagrams and illustrations of circuit designs and layouts
Analysis of power systems and their components
Exam Relevance
Electrical & Electronics Engineering is a significant topic in various examinations, including CBSE, State Boards, NEET, and JEE. Students can expect questions that test their understanding of core concepts, application of formulas, and problem-solving skills. Common question patterns include multiple-choice questions that assess both theoretical knowledge and practical applications, making it essential to be well-prepared with objective questions.
Common Mistakes Students Make
Confusing AC and DC circuit characteristics
Misapplying Ohm's Law in complex circuit problems
Overlooking the significance of units and measurements
Neglecting to review circuit diagrams before answering questions
Failing to understand the practical applications of theoretical concepts
FAQs
Question: What are the key topics covered in Electrical & Electronics Engineering MCQs?Answer: Key topics include circuit theory, electronic devices, signal processing, and power systems.
Question: How can I improve my performance in Electrical & Electronics Engineering exams?Answer: Regular practice of MCQs and understanding the underlying concepts will greatly enhance your performance.
Start solving practice MCQs today to test your understanding and boost your confidence in Electrical & Electronics Engineering. Remember, consistent practice is the key to success in your exams!
Q. According to Kirchhoff's Current Law (KCL), the sum of currents entering a junction is equal to what?
A.
The sum of currents leaving the junction
B.
The total voltage at the junction
C.
The total resistance at the junction
D.
Zero
Show solution
Solution
KCL states that the total current entering a junction must equal the total current leaving that junction, ensuring conservation of charge.
Correct Answer:
A
— The sum of currents leaving the junction
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Q. According to Kirchhoff's Current Law (KCL), what can be said about the current entering a junction?
A.
It must equal the current leaving the junction.
B.
It can be greater than the current leaving.
C.
It can be less than the current leaving.
D.
It has no relation to the current leaving.
Show solution
Solution
KCL states that the total current entering a junction must equal the total current leaving the junction.
Correct Answer:
A
— It must equal the current leaving the junction.
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Q. According to Kirchhoff's Current Law (KCL), what can be said about the currents entering and leaving a junction?
A.
They are always equal
B.
They can be different
C.
They depend on voltage
D.
They are always zero
Show solution
Solution
KCL states that the total current entering a junction must equal the total current leaving that junction.
Correct Answer:
A
— They are always equal
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Q. According to Kirchhoff's Current Law (KCL), what must be true at a junction in an electrical circuit?
A.
The sum of voltages is zero
B.
The sum of currents entering equals the sum of currents leaving
C.
Power is conserved
D.
Resistance is constant
Show solution
Solution
KCL states that the total current entering a junction must equal the total current leaving that junction.
Correct Answer:
B
— The sum of currents entering equals the sum of currents leaving
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Q. According to Kirchhoff's Current Law (KCL), what must be true at a junction?
A.
The sum of voltages is zero
B.
The sum of currents entering equals the sum of currents leaving
C.
The total power is conserved
D.
The total resistance is constant
Show solution
Solution
KCL states that the sum of currents entering a junction must equal the sum of currents leaving that junction.
Correct Answer:
B
— The sum of currents entering equals the sum of currents leaving
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Q. According to Kirchhoff's Current Law (KCL), what must be true at any junction in an electrical circuit?
A.
The sum of currents entering equals the sum of currents leaving
B.
The voltage is constant
C.
The total resistance is zero
D.
Power is conserved
Show solution
Solution
KCL states that the total current entering a junction must equal the total current leaving that junction.
Correct Answer:
A
— The sum of currents entering equals the sum of currents leaving
Learn More →
Q. According to Kirchhoff's Current Law (KCL), what must be true at any junction in a circuit?
A.
The sum of voltages is zero
B.
The sum of currents entering equals the sum of currents leaving
C.
Power is conserved
D.
Current is constant throughout the circuit
Show solution
Solution
KCL states that the sum of currents entering a junction must equal the sum of currents leaving the junction.
Correct Answer:
B
— The sum of currents entering equals the sum of currents leaving
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Q. According to Kirchhoff's Voltage Law (KVL), the sum of the voltages around a closed loop is equal to what?
A.
Zero
B.
The total current
C.
The total resistance
D.
The power consumed
Show solution
Solution
KVL states that the sum of the electrical potential differences (voltages) around any closed network is zero.
Correct Answer:
A
— Zero
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Q. For a second-order system, what does a damping ratio of 0.5 indicate?
A.
Underdamped response
B.
Critically damped response
C.
Overdamped response
D.
Stable response
Show solution
Solution
A damping ratio of less than 1 (0.5 in this case) indicates an underdamped response, characterized by oscillations.
Correct Answer:
A
— Underdamped response
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Q. For a second-order system, what does a damping ratio of less than 1 indicate?
A.
Underdamped response
B.
Critically damped response
C.
Overdamped response
D.
Stable response
Show solution
Solution
A damping ratio less than 1 indicates an underdamped response, which oscillates before settling.
Correct Answer:
A
— Underdamped response
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Q. For a second-order system, what is the damping ratio if the poles are located at -2 ± j2?
A.
0.5
B.
1
C.
0.707
D.
0
Show solution
Solution
The damping ratio (ζ) can be calculated as ζ = -σ/√(σ² + ω²), where σ = 2 and ω = 2, giving ζ = 0.707.
Correct Answer:
C
— 0.707
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Q. How do you calculate the total power in a resistive AC circuit?
A.
P = V^2 / R
B.
P = I^2 * R
C.
P = V * I * cos(φ)
D.
P = R * I
Show solution
Solution
In a resistive AC circuit, the total power (P) can be calculated using the formula P = V * I * cos(φ), where φ is the phase angle between voltage and current.
Correct Answer:
C
— P = V * I * cos(φ)
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Q. How do you calculate the total power in a three-phase AC system?
A.
P = √3 * V * I
B.
P = V * I
C.
P = 3 * V * I
D.
P = V^2 / R
Show solution
Solution
The total power in a balanced three-phase AC system can be calculated using the formula P = √3 * V * I, where V is the line voltage and I is the line current.
Correct Answer:
A
— P = √3 * V * I
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Q. If a capacitor has a capacitance of 10μF and is charged to 5V, what is the stored energy?
A.
0.125 mJ
B.
0.25 mJ
C.
0.5 mJ
D.
1 mJ
Show solution
Solution
Energy stored in a capacitor is given by E = 0.5 * C * V^2 = 0.5 * 10μF * (5V)^2 = 0.125 mJ.
Correct Answer:
A
— 0.125 mJ
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Q. If a circuit has a 15V source and a total resistance of 3Ω, what is the total power consumed in the circuit?
A.
45W
B.
75W
C.
25W
D.
15W
Show solution
Solution
Power P = V^2 / R = 15^2 / 3 = 225 / 3 = 75W.
Correct Answer:
B
— 75W
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Q. If a circuit has a Norton equivalent current of 2A and a Norton equivalent resistance of 4Ω, what is the Thevenin equivalent voltage?
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Solution
Vth = In * Rn = 2A * 4Ω = 8V.
Correct Answer:
C
— 8V
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Q. If a circuit has a Norton equivalent current of 2A and a Norton equivalent resistance of 5Ω, what is the equivalent voltage?
A.
5V
B.
10V
C.
15V
D.
20V
Show solution
Solution
V = I * R = 2A * 5Ω = 10V.
Correct Answer:
B
— 10V
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Q. If a circuit has a Norton equivalent current of 2A and a Norton resistance of 3Ω, what is the Thevenin equivalent resistance?
Show solution
Solution
Thevenin resistance is equal to Norton resistance: Rth = Rn = 3Ω.
Correct Answer:
A
— 3Ω
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Q. If a circuit has a Norton equivalent current of 3A and a Norton equivalent resistance of 2Ω, what is the equivalent voltage?
A.
6V
B.
1.5V
C.
3V
D.
0.5V
Show solution
Solution
The equivalent voltage (V) can be calculated using V = I * R. Therefore, V = 3A * 2Ω = 6V.
Correct Answer:
A
— 6V
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Q. If a circuit has a Norton equivalent current of 3A and a Norton equivalent resistance of 4Ω, what is the equivalent voltage?
A.
12V
B.
7V
C.
3V
D.
1.5V
Show solution
Solution
Using Ohm's Law, V = I * R = 3A * 4Ω = 12V.
Correct Answer:
A
— 12V
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Q. If a circuit has a Norton equivalent current of 5A and a Norton equivalent resistance of 2Ω, what is the equivalent voltage?
Show solution
Solution
Using Ohm's Law, V = I * R = 5A * 2Ω = 10V.
Correct Answer:
C
— 10V
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Q. If a circuit has a Norton equivalent current of 5A and a Norton equivalent resistance of 2Ω, what is the equivalent voltage across the terminals?
A.
10V
B.
5V
C.
2.5V
D.
0V
Show solution
Solution
Using Ohm's law: V = I * R = 5A * 2Ω = 10V.
Correct Answer:
A
— 10V
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Q. If a circuit has a Norton equivalent current of 5A and a Norton equivalent resistance of 2Ω, what is the voltage across the terminals?
A.
10V
B.
5V
C.
2.5V
D.
0V
Show solution
Solution
Using Ohm's law, V = I * R = 5A * 2Ω = 10V.
Correct Answer:
A
— 10V
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Q. If a circuit has a Norton equivalent of 2A and a load resistance of 8Ω, what is the power delivered to the load?
A.
0.5W
B.
1W
C.
2W
D.
4W
Show solution
Solution
Power (P) = I^2 * R = (2A)^2 * 8Ω = 4 * 8 = 32W.
Correct Answer:
C
— 2W
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Q. If a circuit has a Thevenin equivalent of 15V and a load resistance of 5Ω, what is the load current?
A.
3A
B.
2A
C.
1A
D.
0.5A
Show solution
Solution
Using Ohm's law: I = V/R = 15V / 5Ω = 3A.
Correct Answer:
B
— 2A
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Q. If a circuit has a Thevenin equivalent of 5V and 10Ω, what is the current through a load resistor of 5Ω connected across the terminals?
A.
1A
B.
0.5A
C.
2A
D.
0.25A
Show solution
Solution
Using Ohm's law, the current through the load can be calculated as I = Vth / (Rth + Rload) = 5V / (10Ω + 5Ω) = 5V / 15Ω = 0.33A.
Correct Answer:
B
— 0.5A
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Q. If a circuit has a Thevenin equivalent of 5V and a load resistance of 10Ω, what is the load current?
A.
0.5A
B.
1A
C.
2A
D.
5A
Show solution
Solution
Using Ohm's law, I = V / R = 5V / 10Ω = 0.5A.
Correct Answer:
B
— 1A
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Q. If a circuit has a Thevenin equivalent resistance of 5Ω and a load of 10Ω, what is the current through the load?
A.
0.8A
B.
1A
C.
1.2A
D.
1.5A
Show solution
Solution
Using the formula I = Vth / (Rth + Rload), where Vth = 10V, I = 10V / (5Ω + 10Ω) = 10V / 15Ω = 0.67A.
Correct Answer:
B
— 1A
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Q. If a circuit has a total impedance of 4Ω and a current of 3A, what is the voltage across the circuit?
A.
12V
B.
10V
C.
15V
D.
8V
Show solution
Solution
Using Ohm's law, V = I * Z = 3A * 4Ω = 12V.
Correct Answer:
A
— 12V
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Q. If a circuit has a total impedance of 6Ω and a current of 2A, what is the voltage across the circuit?
A.
12V
B.
10V
C.
8V
D.
6V
Show solution
Solution
Using Ohm's Law, V = I * Z = 2A * 6Ω = 12V.
Correct Answer:
A
— 12V
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