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 primary characteristic of a closed-loop control system?
A.
It does not use feedback.
B.
It uses feedback to compare the actual output with the desired output.
C.
It is always unstable.
D.
It cannot be controlled.
Show solution
Solution
Closed-loop systems utilize feedback to adjust their output based on the difference between the actual output and the desired output.
Correct Answer:
B
— It uses feedback to compare the actual output with the desired output.
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Q. What is the primary characteristic of a depletion-mode FET?
A.
It is normally on
B.
It is normally off
C.
It has a negative temperature coefficient
D.
It requires a positive gate voltage to conduct
Show solution
Solution
A depletion-mode FET is normally on, meaning it conducts current without any gate voltage applied, and requires a negative gate voltage to turn off.
Correct Answer:
A
— It is normally on
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Q. What is the primary characteristic of a voltage follower configuration using an operational amplifier?
A.
High gain
B.
Low gain
C.
Unity gain
D.
Negative gain
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Solution
The primary characteristic of a voltage follower configuration is that it provides unity gain.
Correct Answer:
C
— Unity gain
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Q. What is the primary characteristic of a Zener diode?
A.
It allows current to flow in one direction only
B.
It can operate in reverse breakdown region
C.
It has a high forward voltage drop
D.
It is used for high-frequency applications
Show solution
Solution
A Zener diode is designed to operate in the reverse breakdown region, providing voltage regulation.
Correct Answer:
B
— It can operate in reverse breakdown region
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Q. What is the primary characteristic of an open-loop control system?
A.
It uses feedback to adjust its output.
B.
It operates without feedback.
C.
It is always stable.
D.
It can only control linear systems.
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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 operates without feedback.
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Q. What is the primary difference between N-channel and P-channel MOSFETs?
A.
The type of charge carriers
B.
The gate voltage requirements
C.
The physical size
D.
The switching speed
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Solution
The primary difference is that N-channel MOSFETs use electrons as charge carriers, while P-channel MOSFETs use holes.
Correct Answer:
A
— The type of charge carriers
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Q. What is the primary disadvantage of an open-loop control system?
A.
It is more complex than closed-loop systems.
B.
It cannot correct errors in output.
C.
It is less cost-effective.
D.
It requires more components.
Show solution
Solution
The primary disadvantage of an open-loop control system is that it cannot correct errors in output since it does not utilize feedback.
Correct Answer:
B
— It cannot correct errors in output.
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Q. What is the primary fuel used in a natural gas power plant?
A.
Coal
B.
Uranium
C.
Natural gas
D.
Biomass
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Solution
Natural gas power plants primarily use natural gas as fuel to generate electricity, often through combustion in gas turbines.
Correct Answer:
C
— Natural gas
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Q. What is the primary function of a DC-DC converter?
A.
To convert AC to DC
B.
To change the voltage level of DC
C.
To convert DC to AC
D.
To filter DC signals
Show solution
Solution
A DC-DC converter is used to change the voltage level of a DC signal, either stepping it up or stepping it down.
Correct Answer:
B
— To change the voltage level of DC
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Q. What is the primary function of a differential amplifier?
A.
Amplify a single input
B.
Amplify the difference between two inputs
C.
Filter noise
D.
Rectify signals
Show solution
Solution
A differential amplifier amplifies the difference between two input voltages.
Correct Answer:
B
— Amplify the difference between two inputs
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Q. What is the primary function of a diode in communication systems?
A.
Amplification of signals
B.
Rectification of signals
C.
Modulation of signals
D.
Filtering of signals
Show solution
Solution
Diodes are primarily used for rectification, converting AC signals to DC.
Correct Answer:
B
— Rectification of signals
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Q. What is the primary function of a feedback resistor in an operational amplifier circuit?
A.
To increase gain
B.
To stabilize the output
C.
To limit current
D.
To reduce noise
Show solution
Solution
The feedback resistor is used to set the gain of the operational amplifier, thus increasing the overall gain.
Correct Answer:
B
— To stabilize the output
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Q. What is the primary function of a generator in a power plant?
A.
To convert mechanical energy to electrical energy
B.
To store electrical energy
C.
To regulate voltage
D.
To transform AC to DC
Show solution
Solution
The primary function of a generator in a power plant is to convert mechanical energy, usually from a turbine, into electrical energy.
Correct Answer:
A
— To convert mechanical energy to electrical energy
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Q. What is the primary function of a protective relay in a transmission line?
A.
To regulate voltage
B.
To detect faults and initiate disconnection
C.
To measure current
D.
To control power factor
Show solution
Solution
The primary function of a protective relay is to detect faults in the transmission line and initiate disconnection to prevent damage.
Correct Answer:
B
— To detect faults and initiate disconnection
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Q. What is the primary function of a transformer in a power distribution system?
A.
To generate electricity
B.
To convert AC to DC
C.
To step up or step down voltage levels
D.
To store energy
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Solution
Transformers are used in power distribution 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 levels
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Q. What is the primary function of a transformer in a power system?
A.
To convert AC to DC
B.
To step up or step down voltage levels
C.
To store electrical energy
D.
To measure electrical parameters
Show solution
Solution
Transformers are used to change the voltage levels in power systems, either stepping up or stepping down the voltage for efficient transmission and distribution.
Correct Answer:
B
— To step up or step down voltage levels
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Q. What is the primary function of a transformer in a transmission system?
A.
To increase voltage for transmission
B.
To decrease voltage for distribution
C.
To convert AC to DC
D.
To store energy
Show solution
Solution
Transformers are used to increase voltage levels for efficient transmission over long distances.
Correct Answer:
A
— To increase voltage for transmission
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Q. What is the primary function of a transformer in power distribution?
A.
Convert AC to DC
B.
Step up or step down voltage
C.
Store electrical energy
D.
Regulate frequency
Show solution
Solution
The primary function of a transformer in power distribution is to step up or step down voltage levels for efficient transmission.
Correct Answer:
B
— Step up or step down voltage
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Q. What is the primary function of a transformer in power generation?
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 generation to step up voltage for transmission over long distances or step down voltage for distribution.
Correct Answer:
C
— To step up or step down voltage
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Q. What is the primary function of a transmission line's insulator?
A.
To support the line
B.
To prevent electrical leakage
C.
To reduce line losses
D.
To increase line capacity
Show solution
Solution
Insulators are used to support the transmission line and prevent electrical leakage to the ground.
Correct Answer:
B
— To prevent electrical leakage
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Q. What is the primary function of a transmission line's reactance?
A.
To store energy
B.
To limit current flow
C.
To provide voltage regulation
D.
To reduce losses
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Solution
The reactance of a transmission line primarily serves to store energy in the magnetic field, affecting the current flow.
Correct Answer:
B
— To limit current flow
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Q. What is the primary function of a Zener diode?
A.
To rectify AC signals
B.
To allow current to flow in one direction
C.
To regulate voltage
D.
To amplify signals
Show solution
Solution
A Zener diode is specifically designed to regulate voltage by allowing current to flow in the reverse direction when a certain voltage is reached.
Correct Answer:
C
— To regulate voltage
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Q. What is the primary function of an operational amplifier (op-amp)?
A.
To rectify AC signals
B.
To amplify voltage signals
C.
To switch electronic signals
D.
To store charge
Show solution
Solution
The primary function of an operational amplifier 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 primary function of an operational amplifier in a circuit?
A.
To amplify voltage signals
B.
To convert AC to DC
C.
To act as a switch
D.
To store electrical energy
Show solution
Solution
Operational amplifiers are primarily used to amplify voltage signals in various applications.
Correct Answer:
A
— To amplify voltage signals
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Q. What is the primary function of an operational amplifier?
A.
To rectify AC signals
B.
To amplify voltage signals
C.
To switch electronic devices
D.
To store energy
Show solution
Solution
The primary function of an operational amplifier is to amplify voltage signals.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the primary function of protective relays in power systems?
A.
To generate electricity
B.
To monitor system performance
C.
To detect faults and isolate sections
D.
To regulate voltage
Show solution
Solution
Protective relays are designed to detect faults in the power system and isolate affected sections to prevent damage and ensure safety.
Correct Answer:
C
— To detect faults and isolate sections
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Q. What is the primary function of switchgear in an electrical system?
A.
To generate electricity
B.
To control and protect electrical equipment
C.
To transmit power over long distances
D.
To distribute power to end users
Show solution
Solution
Switchgear is used to control, protect, and isolate electrical equipment in a power system.
Correct Answer:
B
— To control and protect electrical equipment
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Q. What is the primary material used in the core of a transformer?
A.
Copper
B.
Aluminum
C.
Silicon steel
D.
Iron
Show solution
Solution
The primary material used in the core of a transformer is silicon steel, which has good magnetic properties.
Correct Answer:
C
— Silicon steel
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Q. What is the primary method of generating electricity in a hydroelectric power plant?
A.
Wind turbines
B.
Steam turbines
C.
Water turbines
D.
Solar panels
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Solution
Hydroelectric power plants primarily use water turbines to convert the kinetic energy of flowing water into electrical energy.
Correct Answer:
C
— Water turbines
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Q. What is the primary method of generating electricity in a thermal power plant?
A.
Solar panels
B.
Wind turbines
C.
Burning fossil fuels
D.
Hydroelectric dams
Show solution
Solution
Thermal power plants primarily generate electricity by burning fossil fuels such as coal, natural gas, or oil to produce steam that drives a turbine.
Correct Answer:
C
— Burning fossil fuels
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