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 purpose of a boost converter?
A.
To step down voltage
B.
To step up voltage
C.
To convert AC to DC
D.
To filter noise from DC
Show solution
Solution
A boost converter is designed to step up the input voltage to a higher output voltage.
Correct Answer:
B
— To step up voltage
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Q. What is the primary purpose of a controller in a control system?
A.
To measure the output.
B.
To provide a reference input.
C.
To manipulate the input to achieve the desired output.
D.
To stabilize the system.
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Solution
The primary purpose of a controller is to manipulate the input to the system in order to achieve the desired output based on the feedback received.
Correct Answer:
C
— To manipulate the input to achieve the desired output.
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Q. What is the primary purpose of a derivative controller in a PID controller?
A.
To eliminate steady-state error.
B.
To predict future errors based on the rate of change.
C.
To provide a constant output.
D.
To increase the system's gain.
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Solution
The derivative controller predicts future errors based on the rate of change, helping to improve system stability and response.
Correct Answer:
B
— To predict future errors based on the rate of change.
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Q. What is the primary purpose of a geotechnical report?
A.
To provide construction costs
B.
To assess environmental impact
C.
To evaluate soil properties and conditions
D.
To design structural elements
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Solution
A geotechnical report evaluates soil properties and conditions to inform design and construction decisions.
Correct Answer:
C
— To evaluate soil properties and conditions
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Q. What is the primary purpose of a load flow study?
A.
To determine the stability of the system
B.
To analyze the economic operation of the system
C.
To calculate the voltage drops and power flows in the network
D.
To design new transmission lines
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Solution
Load flow studies are conducted to calculate voltage drops, power flows, and to ensure that the system operates within its limits.
Correct Answer:
C
— To calculate the voltage drops and power flows in the network
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Q. What is the primary purpose of a PID controller?
A.
To eliminate steady-state error.
B.
To increase system complexity.
C.
To provide open-loop control.
D.
To reduce the system's bandwidth.
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Solution
A PID controller aims to eliminate steady-state error by adjusting the control output based on proportional, integral, and derivative terms.
Correct Answer:
A
— To eliminate steady-state error.
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Q. What is the primary purpose of a snubber circuit in power electronics?
A.
To increase efficiency
B.
To protect against voltage spikes
C.
To reduce harmonics
D.
To improve power factor
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Solution
A snubber circuit is used to protect power electronic devices from voltage spikes and transients.
Correct Answer:
B
— To protect against voltage spikes
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Q. What is the primary purpose of a summing amplifier?
A.
To amplify a single input
B.
To sum multiple input voltages
C.
To filter signals
D.
To convert signals
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Solution
A summing amplifier is designed to sum multiple input voltages into a single output voltage.
Correct Answer:
B
— To sum multiple input voltages
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Q. What is the primary purpose of a surge arrester?
A.
To increase voltage
B.
To protect equipment from voltage spikes
C.
To measure current
D.
To regulate frequency
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Solution
Surge arresters are used to protect electrical equipment from voltage spikes caused by lightning or switching operations.
Correct Answer:
B
— To protect equipment from voltage spikes
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Q. What is the primary purpose of a transformer in a power generation system?
A.
To generate electricity
B.
To convert AC to DC
C.
To step up or step down voltage
D.
To store energy
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Solution
Transformers are used in power generation 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 primary purpose of a transformer in power generation?
A.
To generate electricity
B.
To step up or step down voltage
C.
To store energy
D.
To convert AC to DC
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Solution
Transformers are used in power generation to step up (increase) or step down (decrease) voltage levels for efficient transmission and distribution of electricity.
Correct Answer:
B
— To step up or step down voltage
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Q. What is the primary purpose of a transformer protection relay?
A.
To increase transformer efficiency
B.
To prevent transformer overheating
C.
To detect faults and isolate the transformer
D.
To improve voltage regulation
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Solution
Transformer protection relays are designed to detect faults and isolate the transformer to prevent damage and ensure safety.
Correct Answer:
C
— To detect faults and isolate the transformer
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Q. What is the primary purpose of a transmission line?
A.
To generate electricity
B.
To distribute electricity to consumers
C.
To transmit electricity over long distances
D.
To convert AC to DC
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Solution
The primary purpose of a transmission line is to transmit electricity over long distances from generation sources to substations.
Correct Answer:
C
— To transmit electricity over long distances
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Q. What is the primary purpose of a Zener diode?
A.
To rectify AC signals
B.
To regulate voltage
C.
To amplify signals
D.
To switch currents
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Solution
A Zener diode is primarily used for voltage regulation, allowing current to flow in the reverse direction when a specific voltage is reached.
Correct Answer:
B
— To regulate voltage
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Q. What is the primary purpose of circuit breakers in switchgear?
A.
To regulate voltage
B.
To protect electrical circuits from overloads
C.
To convert AC to DC
D.
To measure current
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Solution
Circuit breakers are designed to protect electrical circuits from overloads and short circuits by interrupting the flow of electricity.
Correct Answer:
B
— To protect electrical circuits from overloads
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Q. What is the primary purpose of load flow analysis in power systems?
A.
To determine the efficiency of generators
B.
To analyze voltage levels and power flows
C.
To calculate energy losses
D.
To design transmission lines
Show solution
Solution
Load flow analysis is used to analyze voltage levels and power flows in a power system to ensure stability and reliability.
Correct Answer:
B
— To analyze voltage levels and power flows
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Q. What is the primary purpose of protective relays in power systems?
A.
Control voltage levels
B.
Detect faults and isolate sections
C.
Regulate power factor
D.
Monitor load conditions
Show solution
Solution
Protective relays are designed to detect faults in the power system and isolate affected sections to prevent damage.
Correct Answer:
B
— Detect faults and isolate sections
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Q. What is the primary purpose of protective relays in transmission systems?
A.
To monitor voltage levels
B.
To disconnect faulty sections
C.
To regulate power flow
D.
To enhance transmission efficiency
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Solution
Protective relays are designed to detect faults and disconnect faulty sections of the transmission system to prevent damage.
Correct Answer:
B
— To disconnect faulty sections
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Q. What is the primary purpose of switchgear in power systems?
A.
To generate electricity
B.
To control and protect electrical equipment
C.
To store energy
D.
To convert voltage levels
Show solution
Solution
Switchgear is used to control, protect, and isolate electrical equipment in power systems, ensuring safe and reliable operation.
Correct Answer:
B
— To control and protect electrical equipment
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Q. What is the primary purpose of using a lead compensator in control systems?
A.
To increase the system's phase margin.
B.
To decrease the system's gain.
C.
To reduce steady-state error.
D.
To stabilize an unstable system.
Show solution
Solution
A lead compensator is used to increase the phase margin, improving system stability and transient response.
Correct Answer:
A
— To increase the system's phase margin.
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Q. What is the primary purpose of using a transformer in a transmission system?
A.
To increase voltage for transmission
B.
To decrease voltage for distribution
C.
To isolate sections of the network
D.
All of the above
Show solution
Solution
Transformers are used to increase voltage for efficient transmission and decrease voltage for safe distribution, among other purposes.
Correct Answer:
D
— All of the above
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Q. What is the primary reason for using high voltage in transmission lines?
A.
To reduce insulation requirements
B.
To minimize energy losses
C.
To increase current flow
D.
To improve safety
Show solution
Solution
High voltage is used in transmission lines to minimize energy losses due to resistance in the conductors.
Correct Answer:
B
— To minimize energy losses
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Q. What is the primary role of a circuit breaker in a transmission line?
A.
To regulate voltage
B.
To protect the line from overloads
C.
To increase transmission capacity
D.
To convert AC to DC
Show solution
Solution
Circuit breakers are designed to protect the transmission line from overloads and short circuits by interrupting the current flow.
Correct Answer:
B
— To protect the line from overloads
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Q. What is the primary role of a gate in a MOSFET?
A.
To control the current flow
B.
To amplify the signal
C.
To provide thermal stability
D.
To rectify the voltage
Show solution
Solution
The gate in a MOSFET controls the current flow between the drain and source by applying a voltage.
Correct Answer:
A
— To control the current flow
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Q. What is the primary role of a rectifier in communication systems?
A.
To amplify signals
B.
To convert AC to DC
C.
To modulate signals
D.
To filter noise
Show solution
Solution
Rectifiers convert alternating current (AC) signals into direct current (DC) for further processing.
Correct Answer:
B
— To convert AC to DC
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Q. What is the primary role of capacitors in power systems?
A.
To increase current
B.
To store energy
C.
To improve power factor
D.
To convert AC to DC
Show solution
Solution
Capacitors are used in power systems to improve the power factor by providing reactive power support, thus enhancing system efficiency.
Correct Answer:
C
— To improve power factor
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Q. What is the primary role of the gate in a MOSFET?
A.
To control the current flow
B.
To provide thermal stability
C.
To amplify signals
D.
To rectify AC signals
Show solution
Solution
The gate of a MOSFET controls the current flow between the drain and source by applying a voltage.
Correct Answer:
A
— To control the current flow
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Q. What is the primary use of a Zener diode?
A.
Rectification
B.
Voltage regulation
C.
Signal amplification
D.
Switching
Show solution
Solution
Zener diodes are primarily used for voltage regulation in circuits, allowing current to flow in the reverse direction when a specific voltage is reached.
Correct Answer:
B
— Voltage regulation
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Q. What is the primary use of an operational amplifier (op-amp) in circuits?
A.
To act as a switch
B.
To amplify voltage signals
C.
To rectify AC signals
D.
To store charge
Show solution
Solution
Operational amplifiers are primarily used to amplify voltage signals in various applications.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the primary use of an operational amplifier (op-amp)?
A.
To rectify AC signals
B.
To amplify voltage signals
C.
To switch electronic devices
D.
To store charge
Show solution
Solution
An operational amplifier (op-amp) is primarily used to amplify voltage signals in various electronic circuits.
Correct Answer:
B
— To amplify voltage signals
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