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 total power delivered to a 6Ω resistor in a circuit with a 24V source?
A.
48W
B.
72W
C.
96W
D.
12W
Show solution
Solution
Power P = V^2 / R = 24^2 / 6 = 576 / 6 = 96W.
Correct Answer:
B
— 72W
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Q. What is the total power dissipated in a circuit with a 24V source and a 4Ω resistor?
A.
6W
B.
12W
C.
24W
D.
48W
Show solution
Solution
Power (P) = V^2 / R = 24V^2 / 4Ω = 576 / 4 = 144W.
Correct Answer:
B
— 12W
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Q. What is the total power dissipated in a circuit with a 24V source and a load of 6Ω?
A.
48W
B.
72W
C.
96W
D.
12W
Show solution
Solution
Power is calculated using P = V^2 / R = 24^2 / 6 = 96W.
Correct Answer:
B
— 72W
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Q. What is the total power dissipated in a circuit with a 24V source and a total resistance of 8Ω?
A.
48W
B.
72W
C.
96W
D.
12W
Show solution
Solution
Power P = V^2 / R = 24V^2 / 8Ω = 576 / 8 = 72W.
Correct Answer:
A
— 48W
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Q. What is the total power in a circuit with a 30V source and a 10Ω resistor?
A.
90W
B.
60W
C.
30W
D.
3W
Show solution
Solution
Power is calculated using P = V^2 / R = 30^2 / 10 = 90W.
Correct Answer:
B
— 60W
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Q. What is the total resistance in a parallel circuit with two resistors of 4 ohms and 6 ohms?
A.
2.4 ohms
B.
10 ohms
C.
24 ohms
D.
12 ohms
Show solution
Solution
The total resistance (R_total) in parallel is given by 1/R_total = 1/R1 + 1/R2. Thus, 1/R_total = 1/4 + 1/6 = 5/12, so R_total = 12/5 = 2.4 ohms.
Correct Answer:
A
— 2.4 ohms
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Q. What is the total resistance in a parallel circuit with two resistors, R1 and R2?
A.
R1 + R2
B.
1 / (1/R1 + 1/R2)
C.
R1 * R2 / (R1 + R2)
D.
R1 - R2
Show solution
Solution
The total resistance in a parallel circuit is given by the formula 1 / (1/R1 + 1/R2).
Correct Answer:
B
— 1 / (1/R1 + 1/R2)
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Q. What is the total voltage in a closed loop according to Kirchhoff's Voltage Law (KVL)?
A.
Equal to the sum of the currents
B.
Equal to zero
C.
Equal to the sum of the resistances
D.
Equal to the power consumed
Show solution
Solution
KVL states that the sum of the electrical potential differences (voltage) around any closed network is zero.
Correct Answer:
B
— Equal to zero
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Q. What is the total voltage in a series circuit with a 12 V battery and two resistors of 4 ohms and 6 ohms?
A.
12 V
B.
10 V
C.
8 V
D.
6 V
Show solution
Solution
In a series circuit, the total voltage is the sum of the individual voltages, which equals the battery voltage of 12 V.
Correct Answer:
A
— 12 V
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Q. What is the total voltage in a series circuit with a 12V battery and two resistors of 4 ohms and 6 ohms?
A.
12 V
B.
10 V
C.
8 V
D.
6 V
Show solution
Solution
In a series circuit, the total voltage is equal to the source voltage, which is 12 V.
Correct Answer:
A
— 12 V
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Q. What is the transfer function of a first-order system with a time constant of 2 seconds?
A.
1/(2s + 1)
B.
2/(s + 2)
C.
1/(s + 2)
D.
2/(2s + 1)
Show solution
Solution
The standard form of a first-order transfer function is 1/(Ts + 1), where T is the time constant. Here, T = 2.
Correct Answer:
A
— 1/(2s + 1)
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Q. What is the transfer function of a first-order system with a time constant of 5 seconds?
A.
1/(5s + 1)
B.
5/(s + 5)
C.
1/(s + 5)
D.
5/(5s + 1)
Show solution
Solution
The standard form of a first-order transfer function is 1/(Ts + 1), where T is the time constant. Here, T = 5.
Correct Answer:
A
— 1/(5s + 1)
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Q. What is the transfer function of a first-order system?
A.
1/(s + 1)
B.
s/(s + 1)
C.
1/(s^2 + 1)
D.
s^2/(s + 1)
Show solution
Solution
The transfer function of a first-order system is typically represented as 1/(s + 1), indicating a single pole.
Correct Answer:
A
— 1/(s + 1)
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Q. What is the transfer function of a system?
A.
A mathematical representation of the system's output to input ratio.
B.
A graphical representation of system stability.
C.
A method to calculate PID parameters.
D.
A type of feedback loop.
Show solution
Solution
The transfer function is a mathematical representation that describes the relationship between the input and output of a system in the Laplace domain.
Correct Answer:
A
— A mathematical representation of the system's output to input ratio.
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Q. What is the typical configuration for a common-emitter BJT amplifier?
A.
Input at collector, output at emitter
B.
Input at base, output at collector
C.
Input at emitter, output at base
D.
Input at collector, output at base
Show solution
Solution
In a common-emitter configuration, the input is applied at the base and the output is taken from the collector.
Correct Answer:
B
— Input at base, output at collector
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Q. What is the typical configuration for an operational amplifier used for voltage amplification?
A.
Inverting
B.
Non-inverting
C.
Differential
D.
All of the above
Show solution
Solution
Operational amplifiers can be configured in various ways, including inverting, non-inverting, and differential configurations for voltage amplification.
Correct Answer:
D
— All of the above
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Q. What is the typical configuration of a common emitter BJT amplifier?
A.
Input at collector, output at emitter
B.
Input at base, output at collector
C.
Input at emitter, output at base
D.
Input at collector, output at base
Show solution
Solution
In a common emitter configuration, the input signal is applied to the base and the output is taken from the collector, providing voltage gain.
Correct Answer:
B
— Input at base, output at collector
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Q. What is the typical configuration used for a common-emitter BJT amplifier?
A.
Input at the emitter, output at the collector
B.
Input at the base, output at the collector
C.
Input at the collector, output at the emitter
D.
Input at the base, output at the emitter
Show solution
Solution
In a common-emitter BJT amplifier, the input is applied at the base and the output is taken from the collector.
Correct Answer:
B
— Input at the base, output at the collector
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Q. What is the typical efficiency range of a power transformer?
A.
70% - 80%
B.
80% - 90%
C.
90% - 98%
D.
98% - 100%
Show solution
Solution
Power transformers typically have an efficiency range of 90% to 98%.
Correct Answer:
C
— 90% - 98%
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Q. What is the typical efficiency range of a well-designed transformer?
A.
50% - 60%
B.
70% - 80%
C.
90% - 99%
D.
100% - 110%
Show solution
Solution
Well-designed transformers typically have an efficiency range of 90% to 99%.
Correct Answer:
C
— 90% - 99%
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Q. What is the typical forward voltage drop of a silicon diode?
A.
0.2V
B.
0.7V
C.
1.5V
D.
2.0V
Show solution
Solution
The typical forward voltage drop of a silicon diode is approximately 0.7V when it is conducting.
Correct Answer:
B
— 0.7V
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Q. What is the typical frequency of operation for power transformers?
A.
50 Hz
B.
60 Hz
C.
400 Hz
D.
Both 50 Hz and 60 Hz
Show solution
Solution
Power transformers typically operate at either 50 Hz or 60 Hz, depending on the region.
Correct Answer:
D
— Both 50 Hz and 60 Hz
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Q. What is the typical frequency of transformers used in power systems?
A.
50 Hz
B.
60 Hz
C.
400 Hz
D.
All of the above
Show solution
Solution
Transformers can operate at various frequencies, with 50 Hz and 60 Hz being the most common in power systems, and 400 Hz used in aviation and some specialized applications.
Correct Answer:
D
— All of the above
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Q. What is the typical input impedance of an ideal operational amplifier?
A.
0 Ohms
B.
1 kOhm
C.
1 MOhm
D.
Infinity
Show solution
Solution
An ideal operational amplifier has infinite input impedance, meaning it draws no current from the input source.
Correct Answer:
D
— Infinity
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Q. What is the typical output impedance of an ideal operational amplifier?
A.
0 Ohms
B.
1 kOhm
C.
1 MOhm
D.
Infinity
Show solution
Solution
An ideal operational amplifier has zero output impedance, allowing it to drive loads without voltage drop.
Correct Answer:
A
— 0 Ohms
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Q. What is the typical value of the friction angle for dense sand?
A.
0 degrees
B.
30 degrees
C.
45 degrees
D.
60 degrees
Show solution
Solution
The typical value of the friction angle for dense sand is around 30 degrees.
Correct Answer:
B
— 30 degrees
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Q. What is the typical voltage level for high voltage transmission lines?
A.
110 kV
B.
400 kV
C.
1 kV
D.
10 kV
Show solution
Solution
High voltage transmission lines typically operate at voltages of 110 kV and above, with 400 kV being common in many regions.
Correct Answer:
B
— 400 kV
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Q. What is the typical voltage range for high voltage transmission lines?
A.
1-10 kV
B.
10-100 kV
C.
100-765 kV
D.
Above 765 kV
Show solution
Solution
High voltage transmission lines typically operate in the range of 100 kV to 765 kV to efficiently transport electricity over long distances.
Correct Answer:
C
— 100-765 kV
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Q. What is the unit of impedance?
A.
Ohm
B.
Volt
C.
Ampere
D.
Watt
Show solution
Solution
The unit of impedance is the Ohm (Ω), which measures the opposition that a circuit presents to the flow of alternating current.
Correct Answer:
A
— Ohm
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Q. What is the voltage across a 10 ohm resistor carrying a current of 2 A?
A.
5 V
B.
10 V
C.
20 V
D.
15 V
Show solution
Solution
Using Ohm's Law, V = I * R = 2 A * 10 ohms = 20 V.
Correct Answer:
C
— 20 V
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