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. In a common-source FET configuration, what is the output taken from?
A.
Source terminal
B.
Gate terminal
C.
Drain terminal
D.
Body terminal
Show solution
Solution
In a common-source FET configuration, the output is taken from the drain terminal.
Correct Answer:
C
— Drain terminal
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Q. In a DC circuit, if the total power consumed is 50W and the voltage is 10V, what is the total current flowing through the circuit?
A.
2A
B.
5A
C.
10A
D.
20A
Show solution
Solution
Power (P) = Voltage (V) * Current (I) => I = P / V = 50W / 10V = 5A.
Correct Answer:
B
— 5A
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Q. In a DC circuit, if the voltage across a 10Ω resistor is 20V, what is the current through the resistor?
A.
2A
B.
0.5A
C.
10A
D.
5A
Show solution
Solution
Using Ohm's Law, I = V/R = 20V / 10Ω = 2A.
Correct Answer:
A
— 2A
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Q. In a DC circuit, if the voltage across a 5Ω resistor is 15V, what is the current through the resistor?
A.
3A
B.
2A
C.
1A
D.
0.5A
Show solution
Solution
Using Ohm's Law, I = V / R = 15V / 5Ω = 3A.
Correct Answer:
A
— 3A
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Q. In a differential amplifier configuration, what does the output voltage depend on?
A.
The difference between the two input voltages
B.
The sum of the two input voltages
C.
Only one input voltage
D.
The power supply voltage
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Solution
The output voltage of a differential amplifier depends on the difference between the two input voltages.
Correct Answer:
A
— The difference between the two input voltages
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Q. In a differential amplifier, what is the output voltage equation?
A.
Vout = (V2 - V1)(Rf/Rin)
B.
Vout = V1 - V2
C.
Vout = (V1 + V2)/2
D.
Vout = V1 + V2
Show solution
Solution
The output voltage of a differential amplifier is given by Vout = (V2 - V1)(Rf/Rin).
Correct Answer:
A
— Vout = (V2 - V1)(Rf/Rin)
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Q. In a differential amplifier, what is the output voltage if both inputs are equal?
A.
0V
B.
Vin
C.
Vout
D.
Rf/Rin
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Solution
If both inputs of a differential amplifier are equal, the output voltage is 0V.
Correct Answer:
A
— 0V
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Q. In a feedback control system, what is the effect of increasing the feedback gain?
A.
It always makes the system unstable.
B.
It can improve stability and reduce steady-state error.
C.
It has no effect on system performance.
D.
It decreases the system's response time.
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Solution
Increasing the feedback gain can improve stability and reduce steady-state error, but excessive gain may lead to instability.
Correct Answer:
B
— It can improve stability and reduce steady-state error.
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Q. In a forward-biased diode, the majority carriers are:
A.
Electrons in the n-type region
B.
Holes in the p-type region
C.
Both electrons and holes
D.
None of the above
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Solution
In a forward-biased diode, both electrons from the n-type region and holes from the p-type region are the majority carriers.
Correct Answer:
C
— Both electrons and holes
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Q. In a forward-biased diode, what happens to the barrier potential?
A.
It increases
B.
It decreases
C.
It remains constant
D.
It reverses
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Solution
In a forward-biased diode, the applied voltage reduces the barrier potential, allowing current to flow.
Correct Answer:
B
— It decreases
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Q. In a hydroelectric power plant, what is the role of the dam?
A.
To store water
B.
To generate steam
C.
To cool the generator
D.
To convert AC to DC
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Solution
The dam in a hydroelectric power plant stores water, creating a reservoir that can be released to generate electricity.
Correct Answer:
A
— To store water
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Q. In a long transmission line, which model is commonly used for analysis?
A.
Short line model
B.
Medium line model
C.
Long line model
D.
Transformer model
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Solution
The long line model is used for transmission lines that are long enough to require consideration of distributed parameters.
Correct Answer:
C
— Long line model
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Q. In a non-inverting amplifier configuration, what is the relationship between the input voltage and the output voltage?
A.
Vout = Vin
B.
Vout = Vin/2
C.
Vout = 2Vin
D.
Vout = Vin + 1
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Solution
In a non-inverting amplifier, the output voltage is equal to the input voltage multiplied by the gain, which can be greater than 1.
Correct Answer:
C
— Vout = 2Vin
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Q. In a non-inverting amplifier configuration, what is the relationship between the input voltage and output voltage?
A.
Vout = Vin
B.
Vout = Vin/2
C.
Vout = Vin + 1
D.
Vout = Vin * (1 + Rf/Rin)
Show solution
Solution
In a non-inverting amplifier, the output voltage is given by Vout = Vin * (1 + Rf/Rin).
Correct Answer:
D
— Vout = Vin * (1 + Rf/Rin)
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Q. In a non-inverting amplifier configuration, what is the relationship between the input and output voltage?
A.
Vout = Vin
B.
Vout = Vin + Vref
C.
Vout = Vin * (1 + Rf/Rin)
D.
Vout = Vin / (1 + Rf/Rin)
Show solution
Solution
In a non-inverting amplifier, the output voltage is given by Vout = Vin * (1 + Rf/Rin).
Correct Answer:
C
— Vout = Vin * (1 + Rf/Rin)
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Q. In a nuclear power plant, what is the role of the reactor?
A.
To convert steam into electricity
B.
To control the nuclear reaction
C.
To store nuclear waste
D.
To cool the system
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Solution
The reactor in a nuclear power plant is responsible for controlling the nuclear fission reaction that generates heat, which is then used to produce steam.
Correct Answer:
B
— To control the nuclear reaction
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Q. In a parallel AC circuit, how does the total current relate to the individual branch currents according to KCL?
A.
Total current is the sum of branch currents
B.
Total current is the average of branch currents
C.
Total current is the maximum branch current
D.
Total current is the minimum branch current
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Solution
In a parallel AC circuit, the total current is the sum of the currents through each branch, as stated by Kirchhoff's Current Law (KCL).
Correct Answer:
A
— Total current is the sum of branch currents
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Q. In a parallel circuit with a 12V source and two resistors (4Ω and 12Ω), what is the total current supplied by the source?
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Solution
Total current I = V * (1/R1 + 1/R2) = 12V * (1/4 + 1/12) = 3A.
Correct Answer:
A
— 3A
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Q. In a parallel circuit with a 12V source and two resistors (4Ω and 6Ω), what is the total current supplied by the source?
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Solution
Total current I = V / Rtotal; Rtotal = 1 / (1/4 + 1/6) = 2.4Ω; I = 12V / 2.4Ω = 5A.
Correct Answer:
B
— 3A
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Q. In a parallel circuit with a 12V source and two resistors of 6Ω and 12Ω, what is the total current drawn from the source?
A.
1 A
B.
2 A
C.
3 A
D.
4 A
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Solution
Total current I = V/R_total. R_total = 1/(1/6 + 1/12) = 4Ω. Thus, I = 12V / 4Ω = 3 A.
Correct Answer:
C
— 3 A
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Q. In a parallel circuit with two resistors (4Ω and 6Ω), what is the total equivalent resistance?
A.
2.4Ω
B.
3.6Ω
C.
10Ω
D.
24Ω
Show solution
Solution
Using the formula for parallel resistors: 1/R_total = 1/4 + 1/6 = 5/12, R_total = 12/5 = 2.4Ω.
Correct Answer:
A
— 2.4Ω
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Q. In a parallel circuit with two resistors (4Ω and 6Ω), what is the total resistance?
A.
2.4Ω
B.
3.6Ω
C.
4Ω
D.
10Ω
Show solution
Solution
Total resistance R = 1 / (1/R1 + 1/R2) = 1 / (1/4 + 1/6) = 1 / (3/12 + 2/12) = 1 / (5/12) = 12/5 = 2.4Ω.
Correct Answer:
A
— 2.4Ω
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Q. In a parallel circuit with two resistors of 6Ω and 3Ω, what is the equivalent resistance?
A.
2Ω
B.
3Ω
C.
4Ω
D.
1.5Ω
Show solution
Solution
The equivalent resistance R_eq = 1 / (1/R1 + 1/R2) = 1 / (1/6 + 1/3) = 1 / (1/6 + 2/6) = 1 / (3/6) = 2Ω.
Correct Answer:
A
— 2Ω
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Q. In a parallel circuit with two resistors, R1 = 4Ω and R2 = 6Ω, what is the total resistance?
A.
2.4Ω
B.
10Ω
C.
24Ω
D.
1.5Ω
Show solution
Solution
Total resistance R = 1 / (1/R1 + 1/R2) = 1 / (1/4 + 1/6) = 2.4Ω.
Correct Answer:
A
— 2.4Ω
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Q. In a parallel circuit, if one branch has a resistance of 6Ω and another has 3Ω, what is the total resistance?
A.
2Ω
B.
4Ω
C.
1.5Ω
D.
9Ω
Show solution
Solution
The total resistance (R_total) in a parallel circuit is calculated using 1/R_total = 1/R1 + 1/R2. Here, 1/R_total = 1/6 + 1/3 = 1/6 + 2/6 = 3/6, so R_total = 2Ω.
Correct Answer:
A
— 2Ω
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Q. In a parallel circuit, if one branch is removed, what happens to the total current?
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
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Solution
In a parallel circuit, removing one branch decreases the total current because the total current is the sum of the currents through each branch.
Correct Answer:
B
— It decreases
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Q. In a parallel circuit, what is the total current if the branch currents are 2A, 3A, and 5A?
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Solution
In a parallel circuit, the total current is the sum of the branch currents: 2A + 3A + 5A = 10A.
Correct Answer:
A
— 10A
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Q. In a PID controller, what does the 'D' stand for?
A.
Direct
B.
Derivative
C.
Dynamic
D.
Displacement
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Solution
The 'D' in PID stands for Derivative, which predicts future error based on its rate of change.
Correct Answer:
B
— Derivative
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Q. In a PID controller, what does the 'I' stand for?
A.
Integral
B.
Inductive
C.
Input
D.
Instantaneous
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Solution
The 'I' in PID stands for Integral, which accumulates the error over time to eliminate steady-state error.
Correct Answer:
A
— Integral
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Q. In a PID controller, what does the 'I' term represent?
A.
Proportional control.
B.
Integral control.
C.
Derivative control.
D.
Input control.
Show solution
Solution
The 'I' term in a PID controller represents integral control, which helps eliminate steady-state error.
Correct Answer:
B
— Integral control.
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