Concept of Basic Electrical and Electronics Engineering
NEC Computer Engineering · 2,602 practice MCQs
The chapter on the Concept of Basic Electrical and Electronics Engineering is essential for aspiring engineers preparing for the NEC licensing exam. It covers foundational principles, including circuit analysis, power measurement, and the behavior of electronic components.
With 2602 practice MCQs, this chapter equips you with the knowledge to tackle questions related to electrical systems, transistor operations, and circuit laws. Mastering these concepts is crucial for success in the exam and your future engineering career.
Sample questions with answers
1.What is the SI unit for apparent power?
- A.Watt
- B.Volt-Ampere
- C.Volt-Ampere Reactive
- D.Kilowatt-hour
Why: The SI unit for apparent power is the Volt-Ampere because it represents the product of voltage and current in an AC circuit, indicating the total power flowing without considering phase differences.
2.Which region of a transistor operates in a linear manner?
- A.Cutoff
- B.Saturation
- C.Breakdown
- D.Active
Why: The active region of a transistor operates in a linear manner, allowing it to amplify signals, as it maintains a constant relationship between input and output for small signal variations.
3.If both wattmeters show equal and opposite readings, what is the power factor?
- A.Unity
- B.0.5
- C.Zero
- D.Lagging
Why: When both wattmeters show equal and opposite readings, it indicates that there is no net power being consumed in the circuit, resulting in a power factor of zero.
4.The term unilateral refers to:
- A.Current flows the same way in both directions
- B.Only nonlinear functionality
- C.Current flows in one preferred direction
- D.Always operating with AC
Why: The term unilateral refers to components that allow current to flow in one preferred direction, which is characteristic of diodes and similar devices.
5.Which device can function as both active and passive based on its use?
- A.Diode
- B.Inductor
- C.Resistor
- D.Capacitor
Why: A diode can function as both an active device when it is forward-biased (allowing current to flow) and as a passive device when it is reverse-biased (blocking current).
6.What principle does Kirchhoff’s voltage law rely on?
- A.Principle of energy conservation
- B.Joule’s principle
- C.Principle of charge conservation
- D.Faraday’s principle
Why: Kirchhoff’s voltage law is based on the principle of energy conservation, stating that the total voltage around any closed loop in a circuit must equal zero, reflecting the conservation of energy in electrical systems.
7.What is the standard unit used to measure electric power?
- A.Ampere
- B.Volt
- C.Watt
- D.Joule
Why: The standard unit for measuring electric power is the Watt, which quantifies the rate at which electrical energy is converted to another form of energy, such as heat or light.
8.What does a triangular wave consist of?
- A.Only even harmonics
- B.Odd harmonics with equal strength
- C.Odd harmonics that decrease in strength
- D.No harmonics at all
Why: A triangular wave consists of odd harmonics that decrease in strength because the waveform's shape leads to a specific harmonic series that includes only odd multiples of the fundamental frequency.
9.What method is used for temporarily taking off the load?
- A.Thevenin method
- B.Only KCL
- C.Only Norton resistance
- D.Only Superposition
Why: The Thevenin method is used for temporarily taking off the load by simplifying a complex circuit into a single voltage source and series resistance, making analysis easier.
10.What is the peak-to-peak value of a sine wave?
- A.Vm
- B.√2 Vm
- C.2Vm
- D.Vm/2
Why: The peak-to-peak value of a sine wave is 2Vm, as it measures the total vertical distance from the maximum positive peak to the maximum negative peak of the waveform.
11.Class AB amplifiers aim to minimize:
- A.Crossover distortion
- B.Voltage range
- C.Performance
- D.Signal amplification
Why: Class AB amplifiers aim to minimize crossover distortion, which occurs when the output transitions between the positive and negative halves of the waveform, ensuring smoother signal amplification.
12.What is the conduction angle for a Class AB amplifier?
- A.Exactly 180°
- B.Between 180° and 360°
- C.Under 90°
- D.360°
Why: The conduction angle for a Class AB amplifier is between 180° and 360°, allowing for both halves of the waveform to be amplified while reducing distortion during the transition.
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Frequently asked questions
- What is the SI unit for apparent power?
- The SI unit for apparent power is the Volt-Ampere (VA).
- Which region of a transistor operates in a linear manner?
- The active region of a transistor operates in a linear manner.
- If both wattmeters show equal and opposite readings, what is the power factor?
- The power factor is zero.
- What does a triangular wave consist of?
- A triangular wave consists of linear rising and falling segments.
- What principle does Kirchhoff’s voltage law rely on?
- Kirchhoff's voltage law relies on the principle of conservation of energy.