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 PID controller, what does the integral term do?
A.
Reduces steady-state error
B.
Increases response time
C.
Decreases overshoot
D.
Eliminates the need for a proportional term
Show solution
Solution
The integral term in a PID controller accumulates the error over time, which helps to eliminate steady-state error.
Correct Answer:
A
— Reduces steady-state error
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Q. In a PID controller, what does the proportional gain affect?
A.
Steady-state error
B.
Transient response
C.
System stability
D.
All of the above
Show solution
Solution
The proportional gain affects all aspects of system performance, including steady-state error, transient response, and stability.
Correct Answer:
D
— All of the above
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Q. In a PID controller, which component is responsible for predicting future errors?
A.
Proportional
B.
Integral
C.
Derivative
D.
All of the above
Show solution
Solution
The derivative component of a PID controller predicts future errors based on the rate of change of the error.
Correct Answer:
C
— Derivative
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Q. In a PN junction diode, what happens when the diode is forward-biased?
A.
The depletion region widens
B.
The diode blocks current
C.
Current flows easily through the diode
D.
The diode becomes an insulator
Show solution
Solution
When a PN junction diode is forward-biased, the depletion region narrows, allowing current to flow easily.
Correct Answer:
C
— Current flows easily through the diode
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Q. In a power system, what does the term 'load flow' refer to?
A.
The flow of electrical energy from generation to load
B.
The flow of water in hydroelectric plants
C.
The movement of switchgear components
D.
The distribution of voltage levels
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Solution
Load flow analysis studies the flow of electrical energy from generation sources to the load in a power system.
Correct Answer:
A
— The flow of electrical energy from generation to load
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Q. In a power system, what does the term 'protection relay' refer to?
A.
A device that measures voltage
B.
A device that controls power factor
C.
A device that detects faults and initiates circuit interruption
D.
A device that regulates frequency
Show solution
Solution
Protection relays are devices that detect faults in the electrical system and initiate the interruption of the circuit to prevent damage.
Correct Answer:
C
— A device that detects faults and initiates circuit interruption
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Q. In a purely resistive AC circuit, what is the phase difference between voltage and current?
A.
0 degrees
B.
90 degrees
C.
180 degrees
D.
45 degrees
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Solution
In a purely resistive AC circuit, the voltage and current are in phase, meaning there is a phase difference of 0 degrees.
Correct Answer:
A
— 0 degrees
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Q. In a second-order system, what does a damping ratio less than 1 indicate?
A.
Critically damped response.
B.
Underdamped response.
C.
Overdamped response.
D.
Stable response.
Show solution
Solution
A damping ratio less than 1 indicates an underdamped response, which typically results in oscillations.
Correct Answer:
B
— Underdamped response.
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Q. In a series AC circuit, how does the total impedance (Z) relate to resistance (R) and reactance (X)?
A.
Z = R + X
B.
Z = R - X
C.
Z = √(R^2 + X^2)
D.
Z = R * X
Show solution
Solution
The total impedance in a series AC circuit is calculated using the formula Z = √(R^2 + X^2), where R is resistance and X is reactance.
Correct Answer:
C
— Z = √(R^2 + X^2)
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Q. In a series AC circuit, if the voltage is 120V and the current is 10A, what is the power consumed?
A.
120W
B.
100W
C.
1000W
D.
1200W
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Solution
Power (P) in an AC circuit is calculated as P = V * I. Therefore, P = 120V * 10A = 1200W.
Correct Answer:
D
— 1200W
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Q. In a series circuit with a 12V battery and two resistors of 4Ω and 6Ω, what is the current flowing through the circuit?
A.
0.8 A
B.
1.2 A
C.
2 A
D.
3 A
Show solution
Solution
Total resistance R = 4Ω + 6Ω = 10Ω. Using Ohm's Law, I = V / R = 12V / 10Ω = 1.2 A.
Correct Answer:
B
— 1.2 A
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Q. In a series circuit with a 24V source and two resistors of 4Ω and 8Ω, what is the voltage across the 8Ω resistor?
A.
16V
B.
8V
C.
12V
D.
4V
Show solution
Solution
Using voltage division, V8Ω = Vtotal * (R8Ω / (R4Ω + R8Ω)) = 24V * (8Ω / (4Ω + 8Ω)) = 24V * (8/12) = 16V.
Correct Answer:
A
— 16V
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Q. In a series circuit with a 9V battery and two resistors (3Ω and 6Ω), what is the voltage across the 6Ω resistor?
A.
6V
B.
3V
C.
9V
D.
4.5V
Show solution
Solution
Using voltage division, V = V_total * (R / (R1 + R2)) = 9V * (6Ω / (3Ω + 6Ω)) = 6V.
Correct Answer:
A
— 6V
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Q. In a series circuit with a 9V battery and two resistors (3Ω and 6Ω), what is the current flowing through the circuit?
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Solution
Total resistance R = 3Ω + 6Ω = 9Ω; I = V / R = 9V / 9Ω = 1A.
Correct Answer:
B
— 2A
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Q. In a series 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
According to Kirchhoff's Current Law (KCL), the total current entering a junction is equal to the total current leaving the junction, which means the total current is the sum of the branch currents.
Correct Answer:
A
— Total current is the sum of branch currents
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Q. In a series circuit, if one resistor fails open, what happens to the current?
A.
It increases
B.
It decreases
C.
It becomes zero
D.
It remains the same
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Solution
In a series circuit, if one resistor fails open, the entire circuit is interrupted, and the current becomes zero.
Correct Answer:
C
— It becomes zero
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Q. In a series circuit, if the total voltage is 12V and the resistance is 4Ω, what is the current flowing through the circuit?
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 series circuit, if the total voltage is 12V and the resistances are 2Ω and 4Ω, what is the current flowing through the circuit?
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Solution
Using Ohm's Law, the total resistance is 2Ω + 4Ω = 6Ω. The current I = V / R = 12V / 6Ω = 2A.
Correct Answer:
B
— 3A
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Q. In a series circuit, if the total voltage is 12V and the resistances are 2Ω, 3Ω, and 5Ω, what is the current flowing through the circuit?
Show solution
Solution
Total resistance R = 2 + 3 + 5 = 10Ω. Using Ohm's Law, I = V / R = 12V / 10Ω = 1.2A.
Correct Answer:
B
— 2A
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Q. In a series RLC circuit, if the resistance is 10Ω, the inductance is 0.1H, and the capacitance is 100μF, what is the resonant frequency?
A.
159.15Hz
B.
100Hz
C.
50Hz
D.
200Hz
Show solution
Solution
The resonant frequency (f0) is given by f0 = 1 / (2π√(LC)). Here, L = 0.1H and C = 100μF, so f0 = 1 / (2π√(0.1 * 0.0001)) = 159.15Hz.
Correct Answer:
A
— 159.15Hz
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Q. In a step-up transformer, the number of turns in the primary winding is:
A.
Greater than the secondary winding
B.
Less than the secondary winding
C.
Equal to the secondary winding
D.
None of the above
Show solution
Solution
In a step-up transformer, the primary winding has fewer turns than the secondary winding.
Correct Answer:
B
— Less than the secondary winding
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Q. In a step-up transformer, which of the following is true?
A.
The primary voltage is higher than the secondary voltage
B.
The primary current is higher than the secondary current
C.
The turns ratio is greater than one
D.
The power output is less than the power input
Show solution
Solution
In a step-up transformer, the turns ratio is greater than one, which results in a higher secondary voltage compared to the primary voltage.
Correct Answer:
C
— The turns ratio is greater than one
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Q. In a summing amplifier configuration, how is the output voltage related to multiple input voltages?
A.
Vout = Vin1 + Vin2
B.
Vout = Vin1 - Vin2
C.
Vout = (Vin1 + Vin2)/2
D.
Vout = - (Vin1 + Vin2)
Show solution
Solution
In a summing amplifier, the output voltage is the negative sum of the input voltages, scaled by the feedback resistor.
Correct Answer:
D
— Vout = - (Vin1 + Vin2)
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Q. In a summing amplifier, how is the output voltage calculated?
A.
Vout = Rf * (V1 + V2)
B.
Vout = (V1 + V2)/Rf
C.
Vout = Rf * (V1 - V2)
D.
Vout = (V1 - V2)/Rf
Show solution
Solution
In a summing amplifier, the output voltage is calculated as Vout = Rf * (V1 + V2).
Correct Answer:
A
— Vout = Rf * (V1 + V2)
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Q. In a summing amplifier, how is the output voltage related to multiple input voltages?
A.
Vout = Vin1 + Vin2
B.
Vout = (Vin1 + Vin2)/R
C.
Vout = -Rf(Rin1*Vin1 + Rin2*Vin2)
D.
Vout = Vin1 * Vin2
Show solution
Solution
In a summing amplifier, the output voltage is Vout = -Rf(Rin1*Vin1 + Rin2*Vin2).
Correct Answer:
C
— Vout = -Rf(Rin1*Vin1 + Rin2*Vin2)
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Q. In a thermal power plant, what is the primary fuel source used for generating electricity?
A.
Natural gas
B.
Wind
C.
Hydro
D.
Biomass
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Solution
Thermal power plants primarily use fossil fuels like natural gas, coal, or oil to generate steam that drives turbines for electricity generation.
Correct Answer:
A
— Natural gas
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Q. In a three-phase power system, what is the phase difference between the phases?
A.
0 degrees
B.
90 degrees
C.
120 degrees
D.
180 degrees
Show solution
Solution
In a balanced three-phase system, the phase difference between each of the three phases is 120 degrees.
Correct Answer:
C
— 120 degrees
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Q. In a three-phase rectifier, how many diodes are typically used?
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Solution
A three-phase rectifier typically uses 6 diodes to convert three-phase AC to DC.
Correct Answer:
D
— 6
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Q. In a three-phase transformer, how many primary and secondary windings are there?
A.
1 primary, 1 secondary
B.
3 primary, 3 secondary
C.
2 primary, 2 secondary
D.
4 primary, 4 secondary
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Solution
A three-phase transformer has 3 primary windings and 3 secondary windings.
Correct Answer:
B
— 3 primary, 3 secondary
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Q. In a three-phase transformer, how many sets of windings are required?
A.
One
B.
Two
C.
Three
D.
Four
Show solution
Solution
A three-phase transformer requires three sets of windings, one for each phase.
Correct Answer:
C
— Three
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