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. If a circuit has a total voltage of 120V and a total current of 10A, what is the total power in the circuit?
A.
1200W
B.
100W
C.
10W
D.
120W
Show solution
Solution
Power P = V * I = 120V * 10A = 1200W.
Correct Answer:
A
— 1200W
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Q. If a circuit has a voltage of 12V and a resistance of 4Ω, what is the current flowing through the circuit?
A.
3A
B.
4A
C.
12A
D.
48A
Show solution
Solution
Using Ohm's Law (I = V / R), the current is I = 12V / 4Ω = 3A.
Correct Answer:
A
— 3A
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Q. If the total power in a circuit is 100W and the power factor is 0.8, what is the apparent power?
A.
80VA
B.
100VA
C.
125VA
D.
200VA
Show solution
Solution
Apparent power (S) is calculated using S = P / power factor. Here, S = 100W / 0.8 = 125VA.
Correct Answer:
C
— 125VA
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Q. In a BJT, what are the three regions called?
A.
Emitter, Base, Collector
B.
Source, Gate, Drain
C.
Anode, Cathode, Gate
D.
Emitter, Collector, Source
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Solution
A BJT consists of three regions: Emitter, Base, and Collector.
Correct Answer:
A
— Emitter, Base, Collector
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Q. In a BJT, what does the term 'active region' refer to?
A.
When the transistor is off
B.
When the transistor is fully on
C.
When the transistor is used for amplification
D.
When the transistor is in saturation
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Solution
The active region of a BJT is where it can amplify signals, operating between cutoff and saturation.
Correct Answer:
C
— When the transistor is used for amplification
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Q. In a BJT, what does the term 'beta' (β) refer to?
A.
The current gain
B.
The voltage drop
C.
The frequency response
D.
The thermal resistance
Show solution
Solution
Beta (β) is the current gain of a Bipolar Junction Transistor (BJT), defined as the ratio of collector current to base current.
Correct Answer:
A
— The current gain
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Q. In a Bode plot, what does a slope of -20 dB/decade indicate?
A.
A first-order system.
B.
A second-order system.
C.
A stable system.
D.
An unstable system.
Show solution
Solution
A slope of -20 dB/decade indicates a first-order system, which has a single pole.
Correct Answer:
A
— A first-order system.
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Q. In a Bode plot, what does the phase margin indicate?
A.
The gain at which the system becomes unstable.
B.
The frequency at which the system has maximum gain.
C.
The amount of additional gain that can be added before instability occurs.
D.
The overall gain of the system.
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Solution
The phase margin is a measure of how much additional gain can be applied before the system becomes unstable.
Correct Answer:
C
— The amount of additional gain that can be added before instability occurs.
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Q. In a buck converter, what happens to the output voltage when the duty cycle is increased?
A.
Output voltage decreases
B.
Output voltage increases
C.
Output voltage remains constant
D.
Output voltage becomes zero
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Solution
In a buck converter, increasing the duty cycle results in a higher output voltage, as more time is spent in the 'on' state.
Correct Answer:
B
— Output voltage increases
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Q. In a buck converter, what is the relationship between input and output voltage?
A.
Output voltage is greater than input voltage
B.
Output voltage is equal to input voltage
C.
Output voltage is less than input voltage
D.
Output voltage can be either greater or less than input voltage
Show solution
Solution
A buck converter steps down the input voltage, resulting in an output voltage that is less than the input voltage.
Correct Answer:
C
— Output voltage is less than input voltage
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Q. In a circuit with a 12V battery and a 3Ω load resistor, what is the current flowing through the load?
Show solution
Solution
Using Ohm's law, I = V/R = 12V / 3Ω = 4A.
Correct Answer:
A
— 2A
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Q. In a circuit with a 12V battery and a 4Ω resistor, what is the current flowing through the resistor?
A.
3A
B.
4A
C.
12A
D.
0.33A
Show solution
Solution
Using Ohm's Law, I = V / R = 12V / 4Ω = 3A.
Correct Answer:
A
— 3A
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Q. In a circuit with a 12V battery and two resistors (3Ω and 6Ω) in series, what is the Thevenin equivalent resistance (Rth) seen from the terminals?
Show solution
Solution
Thevenin resistance is the sum of the resistors in series: Rth = 3Ω + 6Ω = 9Ω.
Correct Answer:
C
— 4Ω
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Q. In a circuit with a 12V source and a 3Ω load, what is the Norton equivalent current (In) at the load terminals?
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Solution
In = V / R = 12V / 3Ω = 4A.
Correct Answer:
A
— 4A
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Q. In a circuit with a 12V source and a 3Ω resistor in series with a 6Ω load, what is the Thevenin equivalent resistance (Rth)?
Show solution
Solution
Rth = Rseries + Rload = 3Ω + 6Ω = 9Ω.
Correct Answer:
C
— 9Ω
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Q. In a circuit with a 12V source and two resistors (3Ω and 6Ω) in parallel, what is the Norton equivalent current (In) at the terminals?
Show solution
Solution
Using the formula In = V / R_eq, where R_eq = (3Ω * 6Ω) / (3Ω + 6Ω) = 2Ω, In = 12V / 2Ω = 6A.
Correct Answer:
A
— 4A
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Q. In a circuit with a 12V source and two resistors (3Ω and 6Ω) in series, what is the Thevenin equivalent resistance (Rth)?
Show solution
Solution
Rth = R1 + R2 = 3Ω + 6Ω = 9Ω.
Correct Answer:
C
— 9Ω
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Q. In a circuit with a 15V source and a 5Ω resistor, what is the current flowing through the resistor?
Show solution
Solution
Using Ohm's law, I = V / R = 15V / 5Ω = 3A.
Correct Answer:
C
— 3A
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Q. In a circuit with a 24V source and a 6Ω resistor, what is the current flowing through the resistor?
Show solution
Solution
Using Ohm's Law, I = V / R = 24V / 6Ω = 4A.
Correct Answer:
B
— 4A
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Q. In a circuit with a 50Ω resistor and a 100V AC source, what is the RMS current?
A.
1A
B.
2A
C.
0.5A
D.
0.25A
Show solution
Solution
The RMS current (I_rms) is calculated using I_rms = V_rms / R. Thus, I_rms = 100V / 50Ω = 2A.
Correct Answer:
B
— 2A
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Q. In a circuit with a current of 5 A and a resistance of 10 ohms, what is the voltage across the resistor?
A.
50 V
B.
5 V
C.
10 V
D.
15 V
Show solution
Solution
Using Ohm's Law, V = I * R = 5 A * 10 ohms = 50 V.
Correct Answer:
A
— 50 V
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Q. In a circuit with a current of 5 A flowing through a resistor of 10 ohms, what is the voltage across the resistor?
A.
50 V
B.
5 V
C.
10 V
D.
15 V
Show solution
Solution
Using Ohm's Law, V = I * R = 5 A * 10 ohms = 50 V.
Correct Answer:
A
— 50 V
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Q. In a circuit with a Norton equivalent current of 3A and a load resistance of 1Ω, what is the voltage across the load?
A.
3V
B.
1V
C.
0.5V
D.
6V
Show solution
Solution
Using Ohm's law: V = I * R = 3A * 1Ω = 3V.
Correct Answer:
A
— 3V
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Q. In a circuit with a Norton equivalent current of 3A and a load resistance of 6Ω, what is the voltage across the load?
A.
6V
B.
9V
C.
12V
D.
18V
Show solution
Solution
Using V = I * R, V = 3A * 6Ω = 18V.
Correct Answer:
C
— 12V
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Q. In a circuit with a Norton equivalent, if the short-circuit current (Isc) is 3A and the Norton resistance (Rn) is 5Ω, what is the Norton equivalent voltage (Vn)?
A.
15V
B.
10V
C.
5V
D.
3V
Show solution
Solution
Norton voltage can be calculated using Ohm's law: Vn = Isc * Rn = 3A * 5Ω = 15V.
Correct Answer:
A
— 15V
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Q. In a closed-loop system, what is the purpose of feedback?
A.
To increase the system's output.
B.
To compare the actual output with the desired output.
C.
To eliminate all disturbances.
D.
To simplify the control algorithm.
Show solution
Solution
Feedback in closed-loop systems is used to compare the actual output with the desired output to make necessary adjustments.
Correct Answer:
B
— To compare the actual output with the desired output.
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Q. In a closed-loop system, what role does feedback play?
A.
It increases the system's complexity.
B.
It helps to correct errors in the output.
C.
It makes the system unstable.
D.
It is not necessary for system operation.
Show solution
Solution
Feedback in a closed-loop system is used to compare the actual output with the desired output, allowing for error correction.
Correct Answer:
B
— It helps to correct errors in the output.
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Q. In a coal-fired power plant, what is the main purpose of the boiler?
A.
To cool the steam
B.
To convert water into steam
C.
To generate electricity directly
D.
To filter emissions
Show solution
Solution
The boiler in a coal-fired power plant is used to convert water into steam by burning coal, which generates heat.
Correct Answer:
B
— To convert water into steam
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Q. In a common-emitter BJT configuration, what is the phase relationship between input and output signals?
A.
In phase
B.
Out of phase
C.
No relationship
D.
Depends on frequency
Show solution
Solution
In a common-emitter BJT configuration, the output signal is out of phase with the input signal, meaning a positive input results in a negative output.
Correct Answer:
B
— Out of phase
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Q. In a common-emitter configuration, what is the phase relationship between input and output signals?
A.
In phase
B.
Out of phase
C.
No phase shift
D.
180 degrees out of phase
Show solution
Solution
In a common-emitter configuration, the output signal is 180 degrees out of phase with the input signal.
Correct Answer:
D
— 180 degrees out of phase
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