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. What is the Thevenin equivalent voltage (Vth) in a circuit with a 10V source and a 2Ω resistor in series with a 4Ω load?
A.
10V
B.
7.5V
C.
5V
D.
2.5V
Show solution
Solution
Vth = Vsource * (Rload / (Rseries + Rload)) = 10V * (4Ω / (2Ω + 4Ω)) = 10V * (4/6) = 7.5V.
Correct Answer:
B
— 7.5V
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Q. What is the Thevenin equivalent voltage across a 10Ω resistor in series with a 20V battery?
A.
20V
B.
10V
C.
30V
D.
0V
Show solution
Solution
The Thevenin equivalent voltage is the open-circuit voltage across the terminals, which is equal to the battery voltage, 20V.
Correct Answer:
A
— 20V
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Q. What is the Thevenin equivalent voltage across a 5Ω resistor in a circuit with a 10V source and a 10Ω resistor in series?
A.
10V
B.
5V
C.
15V
D.
0V
Show solution
Solution
The voltage across the 5Ω resistor is half of the total voltage due to the voltage divider rule: V_th = 10V * (5Ω / (5Ω + 10Ω)) = 10V * (1/3) = 3.33V.
Correct Answer:
B
— 5V
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Q. What is the Thevenin equivalent voltage across a load resistor if the circuit has a 15V source and two resistors (5Ω and 10Ω) in series?
A.
5V
B.
10V
C.
15V
D.
20V
Show solution
Solution
Vth = Vsource * (Rload / (Rseries + Rload)); assuming Rload = 10Ω, Vth = 15V * (10Ω / (5Ω + 10Ω)) = 10V.
Correct Answer:
B
— 10V
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Q. What is the Thevenin equivalent voltage across a load resistor if the open-circuit voltage is 15V?
A.
0V
B.
15V
C.
30V
D.
7.5V
Show solution
Solution
The Thevenin equivalent voltage is equal to the open-circuit voltage, which is 15V.
Correct Answer:
B
— 15V
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Q. What is the Thevenin equivalent voltage across a load resistor in a simple circuit with a 12 V source and a 4 ohm resistor in series with a 2 ohm load?
A.
12 V
B.
8 V
C.
6 V
D.
4 V
Show solution
Solution
The Thevenin equivalent voltage is the voltage across the load resistor, which can be found using voltage division: V_load = V_source * (R_load / (R_series + R_load)) = 12 V * (2 / (4 + 2)) = 8 V.
Correct Answer:
B
— 8 V
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Q. What is the Thevenin equivalent voltage across a load resistor in a simple circuit?
A.
The open-circuit voltage
B.
The short-circuit current
C.
The total current
D.
The total resistance
Show solution
Solution
The Thevenin equivalent voltage is the open-circuit voltage across the load resistor when it is removed from the circuit.
Correct Answer:
A
— The open-circuit voltage
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Q. What is the Thevenin equivalent voltage across a load resistor in a simple circuit with a 12V source and a 4Ω resistor in series?
Show solution
Solution
The Thevenin equivalent voltage is the open-circuit voltage, which is the source voltage, 12V.
Correct Answer:
C
— 12V
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Q. What is the Thevenin equivalent voltage across a load resistor in a simple circuit with a 12 V battery and a 4 ohm resistor in series?
A.
12 V
B.
6 V
C.
4 V
D.
0 V
Show solution
Solution
The Thevenin equivalent voltage is the same as the source voltage, which is 12 V.
Correct Answer:
A
— 12 V
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Q. What is the Thevenin equivalent voltage across terminals A and B if a 12V battery is connected in series with a 4Ω resistor?
Show solution
Solution
The Thevenin equivalent voltage is the open-circuit voltage across terminals A and B, which is equal to the source voltage, 12V.
Correct Answer:
A
— 12V
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Q. What is the Thevenin equivalent voltage across terminals A and B in a circuit with a 10V source and a 5Ω resistor in series with a 10Ω resistor?
A.
10V
B.
6.67V
C.
5V
D.
15V
Show solution
Solution
The voltage across the 10Ω resistor is V = (10V * 10Ω) / (5Ω + 10Ω) = 6.67V.
Correct Answer:
B
— 6.67V
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Q. What is the Thevenin equivalent voltage if a 20V source is connected to a 10Ω resistor in series with a 5Ω resistor?
A.
20V
B.
15V
C.
10V
D.
5V
Show solution
Solution
Using voltage division, Vth = 20V * (5Ω / (10Ω + 5Ω)) = 20V * (5/15) = 6.67V, rounded to 15V.
Correct Answer:
B
— 15V
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Q. What is the Thevenin equivalent voltage if a circuit has a 10V source and a 2Ω resistor in series with a 4Ω load?
A.
2.5V
B.
4V
C.
10V
D.
12V
Show solution
Solution
The Thevenin equivalent voltage is the open-circuit voltage across the load, which is the same as the source voltage in this case, 10V.
Correct Answer:
C
— 10V
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Q. What is the Thevenin equivalent voltage if a circuit has a 12V source and a 4Ω resistor in series with a 2Ω load?
Show solution
Solution
The Thevenin voltage is the voltage across the load resistor. Using voltage division, V_load = 12V * (2Ω / (4Ω + 2Ω)) = 12V * (1/3) = 4V.
Correct Answer:
B
— 8V
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Q. What is the Thevenin equivalent voltage if the circuit has a 20V source and two resistors (5Ω and 10Ω) in series?
A.
20V
B.
13.33V
C.
10V
D.
6.67V
Show solution
Solution
Using voltage division: Vth = 20V * (10Ω / (5Ω + 10Ω)) = 20V * (10/15) = 13.33V.
Correct Answer:
B
— 13.33V
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Q. What is the Thevenin equivalent voltage if the open-circuit voltage across the terminals is 15V?
A.
0 V
B.
15 V
C.
30 V
D.
45 V
Show solution
Solution
The Thevenin equivalent voltage is equal to the open-circuit voltage, which is 15 V.
Correct Answer:
B
— 15 V
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Q. What is the Thevenin equivalent voltage in a circuit?
A.
The open-circuit voltage at the terminals
B.
The short-circuit current
C.
The total voltage in the circuit
D.
The voltage drop across the load
Show solution
Solution
The Thevenin equivalent voltage is defined as the open-circuit voltage measured across the terminals of the circuit.
Correct Answer:
A
— The open-circuit voltage at the terminals
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Q. What is the Thevenin equivalent voltage of a circuit with a 10 V source and a 5 ohm resistor in series with a 10 ohm load?
A.
10 V
B.
5 V
C.
15 V
D.
0 V
Show solution
Solution
The Thevenin equivalent voltage is the open-circuit voltage, which is 10 V in this case.
Correct Answer:
A
— 10 V
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Q. What is the Thevenin equivalent voltage of a circuit with a 10V source and a 5Ω resistor in series with a 10Ω resistor?
A.
10V
B.
5V
C.
15V
D.
0V
Show solution
Solution
Thevenin equivalent voltage is the open-circuit voltage, which is 10V across the 5Ω resistor.
Correct Answer:
A
— 10V
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Q. What is the time constant of a second-order system with a damping ratio of 0.5 and natural frequency of 2 rad/s?
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Solution
The time constant for a second-order system can be approximated as 1/(damping ratio * natural frequency), which is 1/(0.5 * 2) = 1.
Correct Answer:
B
— 1
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Q. What is the time constant of a system with a transfer function G(s) = 1/(2s + 1)?
Show solution
Solution
The time constant T of a first-order system is the coefficient of s in the denominator. Here, T = 1/2 = 2.
Correct Answer:
C
— 2
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Q. What is the time constant of a system with a transfer function G(s) = 5/(2s + 5)?
Show solution
Solution
The time constant T is given by the coefficient of s in the denominator, which is 2. Therefore, T = 5/2 = 0.4.
Correct Answer:
A
— 0.4
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Q. What is the time constant of a system with a transfer function of 1/(2s + 1)?
A.
0.5 seconds
B.
2 seconds
C.
1 second
D.
4 seconds
Show solution
Solution
The time constant (T) is the coefficient of s in the denominator, which is 1/2, thus T = 2 seconds.
Correct Answer:
B
— 2 seconds
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Q. What is the total capacitance of two capacitors in series, C1 = 4μF and C2 = 6μF?
A.
2.4μF
B.
10μF
C.
24μF
D.
1.5μF
Show solution
Solution
The formula for total capacitance in series is 1/C_total = 1/C1 + 1/C2. Thus, 1/C_total = 1/4 + 1/6 = 5/12, so C_total = 12/5 = 2.4μF.
Correct Answer:
A
— 2.4μF
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Q. What is the total current in a circuit with a 12V battery and three resistors (4Ω, 6Ω, and 12Ω) in series?
A.
0.5 A
B.
1 A
C.
2 A
D.
3 A
Show solution
Solution
Total resistance R = 4Ω + 6Ω + 12Ω = 22Ω. Using Ohm's Law, I = V / R = 12V / 22Ω ≈ 0.545 A.
Correct Answer:
B
— 1 A
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Q. What is the total current in a circuit with a 24V source and two resistors in series, 8Ω and 4Ω?
A.
2 A
B.
3 A
C.
4 A
D.
6 A
Show solution
Solution
Total resistance R = 8Ω + 4Ω = 12Ω. Using Ohm's Law, I = V / R = 24V / 12Ω = 2 A.
Correct Answer:
B
— 3 A
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Q. What is the total impedance of a series circuit with a resistor of 4 ohms and an inductor with a reactance of 3 ohms?
A.
7 ohms
B.
1 ohm
C.
12 ohms
D.
8 ohms
Show solution
Solution
In a series circuit, total impedance Z = R + jX, so Z = 4 + j3, which has a magnitude of 7 ohms.
Correct Answer:
A
— 7 ohms
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Q. What is the total impedance of a series circuit with a resistor of 4Ω and an inductor with a reactance of 3Ω?
Show solution
Solution
In a series circuit, total impedance Z = R + jX = 4Ω + j3Ω, which gives a magnitude of √(4² + 3²) = 5Ω.
Correct Answer:
B
— 7Ω
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Q. What is the total power consumed in a circuit with a 12V battery supplying a current of 2A?
A.
24W
B.
12W
C.
6W
D.
48W
Show solution
Solution
Power can be calculated using P = V * I. Thus, P = 12V * 2A = 24W.
Correct Answer:
A
— 24W
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Q. What is the total power consumed in a circuit with a 24V source and a total resistance of 6Ω?
A.
48W
B.
72W
C.
36W
D.
60W
Show solution
Solution
Power P = V^2 / R = 24V^2 / 6Ω = 96W.
Correct Answer:
B
— 72W
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