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 main characteristic of a BJT in the active region?
A.
It acts as a switch
B.
It can amplify current
C.
It has high input impedance
D.
It is always in saturation
Show solution
Solution
In the active region, a BJT can amplify current, making it useful in amplification applications.
Correct Answer:
B
— It can amplify current
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Q. What is the main characteristic of a common-emitter BJT configuration?
A.
High input impedance
B.
Inverted output
C.
Low voltage gain
D.
No phase shift
Show solution
Solution
The common-emitter configuration provides an inverted output, meaning the output signal is 180 degrees out of phase with the input.
Correct Answer:
B
— Inverted output
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Q. What is the main characteristic of a Schottky diode?
A.
High reverse breakdown voltage
B.
Low forward voltage drop
C.
High current gain
D.
Temperature stability
Show solution
Solution
A Schottky diode is known for its low forward voltage drop, making it efficient for high-speed switching applications.
Correct Answer:
B
— Low forward voltage drop
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Q. What is the main characteristic of an open-loop control system?
A.
It uses feedback to adjust its output.
B.
It does not use feedback.
C.
It is always stable.
D.
It can only control linear systems.
Show solution
Solution
An open-loop control system operates without feedback, meaning it does not adjust its output based on the actual performance.
Correct Answer:
B
— It does not use feedback.
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Q. What is the main difference between N-channel and P-channel MOSFETs?
A.
The type of charge carriers
B.
The gate voltage requirements
C.
The switching speed
D.
The thermal stability
Show solution
Solution
The main difference between N-channel and P-channel MOSFETs is the type of charge carriers; N-channel uses electrons while P-channel uses holes.
Correct Answer:
A
— The type of charge carriers
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Q. What is the main disadvantage of coal-fired power plants?
A.
High operational costs
B.
Low energy output
C.
High carbon emissions
D.
Limited availability
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Solution
Coal-fired power plants are known for their high carbon emissions, contributing significantly to air pollution and climate change.
Correct Answer:
C
— High carbon emissions
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Q. What is the main disadvantage of open-loop systems?
A.
They are more complex than closed-loop systems.
B.
They cannot correct errors.
C.
They are always unstable.
D.
They require more sensors.
Show solution
Solution
The main disadvantage of open-loop systems is that they cannot correct errors, as they do not use feedback.
Correct Answer:
B
— They cannot correct errors.
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Q. What is the main disadvantage of using a dry-type transformer?
A.
Higher cost
B.
Lower efficiency
C.
Larger size
D.
Limited voltage ratings
Show solution
Solution
Dry-type transformers tend to be more expensive compared to oil-filled transformers, which can be a disadvantage in certain applications.
Correct Answer:
A
— Higher cost
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Q. What is the main disadvantage of using a linear regulator compared to a switching regulator?
A.
Higher efficiency
B.
Lower output voltage ripple
C.
Higher heat generation
D.
More complex design
Show solution
Solution
The main disadvantage of a linear regulator is that it generates more heat compared to a switching regulator, leading to lower efficiency.
Correct Answer:
C
— Higher heat generation
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Q. What is the main disadvantage of using a step-down transformer?
A.
Increased voltage
B.
Increased current
C.
Higher losses
D.
Limited applications
Show solution
Solution
Step-down transformers can have higher losses due to increased current in the secondary winding.
Correct Answer:
C
— Higher losses
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Q. What is the main disadvantage of using coal as a power generation method?
A.
High initial cost
B.
Limited availability
C.
High greenhouse gas emissions
D.
Low energy output
Show solution
Solution
Coal-fired power generation is associated with high greenhouse gas emissions, contributing to climate change.
Correct Answer:
C
— High greenhouse gas emissions
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Q. What is the main function of a transformer in a power distribution system?
A.
To generate electricity
B.
To convert AC to DC
C.
To step down high voltage for safe distribution
D.
To store energy
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Solution
In a power distribution system, transformers step down high voltage to safer levels for distribution.
Correct Answer:
C
— To step down high voltage for safe distribution
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Q. What is the main function of a transformer in a transmission system?
A.
To increase or decrease voltage levels
B.
To store electrical energy
C.
To convert AC to DC
D.
To protect the system from faults
Show solution
Solution
Transformers are used to increase or decrease voltage levels in a transmission system to facilitate efficient power transfer.
Correct Answer:
A
— To increase or decrease voltage levels
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Q. What is the main function of an inverter in power electronics?
A.
To convert DC to AC
B.
To convert AC to DC
C.
To regulate voltage
D.
To filter harmonics
Show solution
Solution
An inverter's main function is to convert direct current (DC) into alternating current (AC).
Correct Answer:
A
— To convert DC to AC
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Q. What is the main purpose of a circuit breaker in a power system?
A.
To increase voltage
B.
To provide isolation
C.
To interrupt fault currents
D.
To regulate frequency
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Solution
Circuit breakers are designed to interrupt fault currents and protect the electrical system from damage due to overloads or short circuits.
Correct Answer:
C
— To interrupt fault currents
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Q. What is the main purpose of a power transformer in a transmission system?
A.
To increase the current
B.
To decrease the current
C.
To increase the voltage for long-distance transmission
D.
To convert AC to DC
Show solution
Solution
Power transformers are used to step up the voltage for efficient long-distance transmission, reducing losses due to resistance.
Correct Answer:
C
— To increase the voltage for long-distance transmission
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Q. What is the main purpose of a retaining wall?
A.
To support vertical loads
B.
To prevent soil erosion
C.
To retain soil at different elevations
D.
To provide drainage
Show solution
Solution
The primary purpose of a retaining wall is to retain soil at different elevations and prevent it from sliding.
Correct Answer:
C
— To retain soil at different elevations
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Q. What is the main purpose of a transformer in a power system?
A.
To generate electricity
B.
To convert AC to DC
C.
To step up or step down voltage
D.
To store energy
Show solution
Solution
Transformers are used to step up or step down voltage levels in power systems for efficient transmission and distribution.
Correct Answer:
C
— To step up or step down voltage
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Q. What is the main purpose of a transformer in power systems?
A.
To generate electricity
B.
To convert AC to DC
C.
To step up or step down voltage
D.
To store energy
Show solution
Solution
Transformers are used in power systems to step up or step down voltage levels for efficient transmission and distribution of electricity.
Correct Answer:
C
— To step up or step down voltage
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Q. What is the main purpose of a transformer protection relay?
A.
To measure voltage
B.
To detect faults and protect the transformer
C.
To regulate output voltage
D.
To monitor temperature
Show solution
Solution
The main purpose of a transformer protection relay is to detect faults and protect the transformer.
Correct Answer:
B
— To detect faults and protect the transformer
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Q. What is the main purpose of a transformer tap changer?
A.
To increase the voltage
B.
To decrease the voltage
C.
To adjust the output voltage
D.
To protect the transformer
Show solution
Solution
A transformer tap changer is used to adjust the output voltage to maintain desired levels.
Correct Answer:
C
— To adjust the output voltage
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Q. What is the main purpose of an isolation transformer?
A.
To increase voltage
B.
To decrease voltage
C.
To provide electrical isolation
D.
To improve power factor
Show solution
Solution
Isolation transformers are used to provide electrical isolation between circuits, enhancing safety and reducing noise.
Correct Answer:
C
— To provide electrical isolation
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Q. What is the main purpose of an operational amplifier (op-amp)?
A.
To rectify AC signals
B.
To amplify voltage signals
C.
To switch electronic circuits
D.
To store charge
Show solution
Solution
The main purpose of an operational amplifier (op-amp) is to amplify voltage signals, often used in various analog applications.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the main purpose of using a transformer in power distribution?
A.
To increase current
B.
To decrease losses during transmission
C.
To convert AC to DC
D.
To store energy
Show solution
Solution
Transformers are used in power distribution to decrease losses during transmission by increasing voltage levels.
Correct Answer:
B
— To decrease losses during transmission
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Q. What is the main role of the gate terminal in a MOSFET?
A.
To control the current flow
B.
To provide power supply
C.
To connect to the load
D.
To ground the circuit
Show solution
Solution
The gate terminal in a MOSFET controls the current flow between the drain and source terminals.
Correct Answer:
A
— To control the current flow
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Q. What is the Norton equivalent current (In) for a circuit with a 15V source and a 5Ω resistor?
A.
3A
B.
5A
C.
15A
D.
0.5A
Show solution
Solution
In = Vsource / R = 15V / 5Ω = 3A.
Correct Answer:
A
— 3A
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Q. What is the Norton equivalent current (In) for a circuit with a 15V source and a 5Ω resistor in parallel with a 10Ω resistor?
A.
1.5A
B.
2A
C.
3A
D.
0.5A
Show solution
Solution
In = V / R_parallel = 15V / (1/(1/5 + 1/10)) = 15V / (10/3) = 4.5A.
Correct Answer:
B
— 2A
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Q. What is the Norton equivalent current for a circuit with a 10 ohm resistor across a 20 V source?
A.
2 A
B.
0.5 A
C.
20 A
D.
10 A
Show solution
Solution
The Norton equivalent current (I_N) is calculated as I_N = V/R = 20 V / 10 ohms = 2 A.
Correct Answer:
A
— 2 A
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Q. What is the Norton equivalent current for a circuit with a 10Ω resistor across a 20V source?
Show solution
Solution
Norton current I_N = V / R = 20V / 10Ω = 2A.
Correct Answer:
B
— 2A
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Q. What is the Norton equivalent current for a circuit with a 10Ω resistor and a 20V source?
A.
2A
B.
0.5A
C.
20A
D.
10A
Show solution
Solution
The Norton equivalent current is the short-circuit current, which can be calculated as I = V / R = 20V / 10Ω = 2A.
Correct Answer:
A
— 2A
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