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 transfer function, what does a pole represent?
A.
A point of zero output.
B.
A frequency where the system is stable.
C.
A frequency where the system response goes to infinity.
D.
A point of maximum gain.
Show solution
Solution
A pole in a transfer function indicates a frequency at which the system's output can become unbounded, affecting stability.
Correct Answer:
C
— A frequency where the system response goes to infinity.
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Q. In a transfer function, what does a zero represent?
A.
A point where the output is zero for a non-zero input.
B.
A point of instability.
C.
A point where the system is stable.
D.
A point of maximum gain.
Show solution
Solution
A zero in a transfer function indicates a frequency at which the output becomes zero for a non-zero input.
Correct Answer:
A
— A point where the output is zero for a non-zero input.
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Q. In a transformer, what does the term 'turns ratio' refer to?
A.
The ratio of primary to secondary voltage
B.
The ratio of primary to secondary current
C.
The ratio of primary to secondary turns
D.
The ratio of power input to output
Show solution
Solution
The turns ratio of a transformer is the ratio of the number of turns in the primary winding to the number of turns in the secondary winding.
Correct Answer:
C
— The ratio of primary to secondary turns
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Q. In a transformer, what does the turns ratio determine?
A.
The efficiency of the transformer
B.
The voltage transformation
C.
The current rating
D.
The core material
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Solution
The turns ratio of a transformer determines the voltage transformation between the primary and secondary windings.
Correct Answer:
B
— The voltage transformation
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Q. In a transmission line, what does the term 'surge impedance' refer to?
A.
The resistance to current flow
B.
The characteristic impedance of the line
C.
The maximum voltage the line can handle
D.
The power factor of the line
Show solution
Solution
Surge impedance refers to the characteristic impedance of the transmission line, which affects wave propagation.
Correct Answer:
B
— The characteristic impedance of the line
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Q. In an AC circuit, if the impedance is 5Ω and the current is 2A, what is the voltage across the circuit?
A.
10V
B.
5V
C.
2.5V
D.
1V
Show solution
Solution
Using Ohm's Law for AC, V = I * Z = 2A * 5Ω = 10V.
Correct Answer:
A
— 10V
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Q. In an AC circuit, if the voltage is given as V(t) = 100√2 sin(ωt), what is the RMS voltage?
A.
100 V
B.
70.71 V
C.
141.42 V
D.
50 V
Show solution
Solution
The RMS voltage (V_rms) for a sinusoidal waveform is V_peak / √2, so V_rms = 100√2 / √2 = 100 V.
Correct Answer:
B
— 70.71 V
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Q. In an AC circuit, if the voltage is given as V(t) = 10sin(100t), what is the peak voltage?
A.
10V
B.
5V
C.
7.07V
D.
0V
Show solution
Solution
The peak voltage (V_peak) is the coefficient of the sine function, which is 10V.
Correct Answer:
A
— 10V
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Q. In an AC circuit, what does impedance represent?
A.
The total opposition to current flow
B.
The total voltage in the circuit
C.
The total power consumed
D.
The total current flowing
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Solution
Impedance in an AC circuit represents the total opposition to current flow, combining resistance and reactance.
Correct Answer:
A
— The total opposition to current flow
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Q. In an AC circuit, what does the impedance (Z) represent?
A.
Total opposition to current flow
B.
Only resistance
C.
Only reactance
D.
Voltage drop
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Solution
Impedance (Z) is the total opposition that a circuit offers to the flow of alternating current, combining both resistance and reactance.
Correct Answer:
A
— Total opposition to current flow
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Q. In an AC circuit, what does the term 'impedance' refer to?
A.
Resistance only
B.
Total opposition to current
C.
Voltage drop
D.
Current flow
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Solution
Impedance is the total opposition that a circuit offers to the flow of alternating current, which includes both resistance and reactance.
Correct Answer:
B
— Total opposition to current
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Q. In an AC circuit, what is the impedance of a circuit with a resistor of 4Ω and an inductor with a reactance of 3Ω?
Show solution
Solution
Impedance (Z) in a series circuit is calculated using Z = √(R^2 + X_L^2). Here, Z = √(4^2 + 3^2) = √(16 + 9) = √25 = 5Ω.
Correct Answer:
B
— 7Ω
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Q. In an AC circuit, what is the impedance of a circuit with a resistor of 5Ω and an inductor with a reactance of 3Ω?
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Solution
Impedance Z = √(R^2 + X_L^2) = √(5^2 + 3^2) = √(25 + 9) = √34 ≈ 8Ω.
Correct Answer:
B
— 8Ω
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Q. In an AC circuit, what is the phase difference between voltage and current in a purely resistive load?
A.
0 degrees
B.
90 degrees
C.
180 degrees
D.
270 degrees
Show solution
Solution
In a purely resistive load, the voltage and current are in phase, meaning the phase difference is 0 degrees.
Correct Answer:
A
— 0 degrees
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Q. In an AC circuit, what is the phase difference between voltage and current in a purely resistive circuit?
A.
0 degrees
B.
90 degrees
C.
180 degrees
D.
270 degrees
Show solution
Solution
In a purely resistive circuit, the voltage and current are in phase, resulting in a phase difference of 0 degrees.
Correct Answer:
A
— 0 degrees
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Q. In an AC circuit, what is the power factor?
A.
Ratio of real power to apparent power
B.
Ratio of reactive power to real power
C.
Total power consumed
D.
Voltage divided by current
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Solution
The power factor in an AC circuit is defined as the ratio of real power (P) to apparent power (S), indicating how effectively the current is being converted into useful work.
Correct Answer:
A
— Ratio of real power to apparent power
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Q. In an inverting amplifier configuration, if the feedback resistor is 10 kOhm and the input resistor is 1 kOhm, what is the gain?
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Solution
The gain of an inverting amplifier is given by -Rf/Rin, which in this case is -10 kOhm / 1 kOhm = -10.
Correct Answer:
A
— -10
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Q. In an inverting amplifier configuration, if the feedback resistor is 10k ohms and the input resistor is 1k ohm, what is the gain?
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Solution
The gain of an inverting amplifier is given by -Rf/Rin, which in this case is -10k/1k = -10.
Correct Answer:
A
— -10
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Q. In an inverting amplifier configuration, if the feedback resistor is 10kΩ and the input resistor is 1kΩ, what is the gain?
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Solution
The gain of an inverting amplifier is given by -Rf/Rin, which in this case is -10kΩ/1kΩ = -10.
Correct Answer:
A
— -10
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Q. In an operational amplifier, what is the purpose of negative feedback?
A.
To increase gain
B.
To stabilize the output
C.
To reduce distortion
D.
To increase bandwidth
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Solution
Negative feedback in an operational amplifier is used to stabilize the output and control the gain.
Correct Answer:
B
— To stabilize the output
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Q. In control systems, what does the term 'stability' refer to?
A.
The ability to maintain a constant output.
B.
The ability to return to equilibrium after a disturbance.
C.
The speed of the system's response.
D.
The accuracy of the system's output.
Show solution
Solution
Stability refers to the ability of a system to return to equilibrium after a disturbance, ensuring that it does not diverge or oscillate indefinitely.
Correct Answer:
B
— The ability to return to equilibrium after a disturbance.
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Q. In hydroelectric power generation, 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 hydroelectric power generation stores water, creating a reservoir that can be released to drive turbines and generate electricity.
Correct Answer:
A
— To store water
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Q. In load flow analysis, what does the term 'slack bus' refer to?
A.
A bus with zero load
B.
A bus that maintains system frequency
C.
A bus that compensates for losses in the system
D.
A bus with the highest voltage
Show solution
Solution
The slack bus is used in load flow studies to balance the active and reactive power in the system, compensating for losses and ensuring the system operates correctly.
Correct Answer:
C
— A bus that compensates for losses in the system
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Q. In load flow studies, what is the significance of transformer tap changing?
A.
It affects the power factor
B.
It adjusts the voltage levels
C.
It increases the load capacity
D.
It reduces losses
Show solution
Solution
Transformer tap changing is significant in load flow studies as it adjusts the voltage levels to maintain system stability and efficiency.
Correct Answer:
B
— It adjusts the voltage levels
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Q. In modulation, what does the term 'carrier signal' refer to?
A.
The original message signal
B.
The signal used to carry the information
C.
The noise in the system
D.
The output signal after modulation
Show solution
Solution
The carrier signal is the signal used to carry the information in modulation processes.
Correct Answer:
B
— The signal used to carry the information
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Q. In power distribution, what does the term 'feeder' refer to?
A.
A type of transformer
B.
A line that carries electricity from substations to consumers
C.
A protective device
D.
A method of load flow analysis
Show solution
Solution
In power distribution, a 'feeder' refers to a line that carries electricity from substations to consumers, distributing power to various loads.
Correct Answer:
B
— A line that carries electricity from substations to consumers
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Q. In power distribution, what is the purpose of a distribution transformer?
A.
To generate electricity
B.
To step down voltage for consumer use
C.
To store energy
D.
To convert AC to DC
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Solution
Distribution transformers step down high voltage electricity from the distribution network to a lower voltage suitable for consumer use.
Correct Answer:
B
— To step down voltage for consumer use
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Q. In root locus analysis, what does the location of poles indicate?
A.
The system's output.
B.
The stability of the system.
C.
The input signal.
D.
The transfer function.
Show solution
Solution
The location of poles in root locus analysis indicates the stability of the system; poles in the left half-plane suggest stability.
Correct Answer:
B
— The stability of the system.
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Q. In root locus analysis, what does the root locus plot indicate?
A.
The stability of the system as gain varies.
B.
The time response of the system.
C.
The transfer function of the system.
D.
The frequency response of the system.
Show solution
Solution
The root locus plot indicates the stability of the system as the gain varies, showing how the poles move in the complex plane.
Correct Answer:
A
— The stability of the system as gain varies.
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Q. In root locus analysis, what does the root locus plot represent?
A.
The path of the system poles as gain varies.
B.
The frequency response of the system.
C.
The time response of the system.
D.
The steady-state error of the system.
Show solution
Solution
The root locus plot shows how the poles of the system move in the s-plane as the gain is varied, indicating stability.
Correct Answer:
A
— The path of the system poles as gain varies.
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