Free Electronics MCQs with Answers

• A. Convert Direct current (DC) into Alternating current (AC)
• B. Smooth out voltage fluctuations
• C. Convert AC to DC by allowing current to flow in one direction
• D. Amplify electrical signals

Explanation: Rectification is the process of converting Alternating Current (AC) to Direct Current (DC) by allowing current to flow in one direction…

• A. Generator
• B. Transformer
• C. Filter
• D. Choke

Explanation: Explanation: A filter circuit is specifically designed to smooth out the pulsating DC voltage produced by a rectifier.

• A. Amplification
• B. Rectification
• C. Modulation
• D. Detection

Explanation: Correct. Rectification is the process of converting alternating current (AC) into direct current (DC) using diodes.

• A. Reverse biasing
• B. Forward biasing
• C. Biasing voltage
• D. Junction potential
• E. Potential barrier

Explanation: The potential difference applied across a diode to reduce the depletion layer is: Forward biasing.

• A. Conductor
• B. Semi-conductor
• C. Super conductor
• D. Insulator

Explanation: When the temperature of a semiconductor drops to absolute zero, the semiconductor behaves as an insulator.

• A. AC current
• B. Unidirectional current
• C. Zero always
• D. Straight line parallel to vertical axis

Explanation: Half wave rectifier is one in which the half cycle of AC voltage gets converted into pulsating DC voltage.

• A. Less than the resistance of half wave rectifier
• B. More than the resistance of half wave rectifier
• C. Equal to the resistance of half wave rectifier
• D. Negligible in comparison to the resistance of half wave rectifier

Explanation: This is the correct answer. A full-wave rectifier is more efficient. It utilizes both halves of the AC input, resulting in a higher…

• A. Magnification
• B. Amplification
• C. Rectification
• D. Resolution

Explanation: Both AC and DC describe types of current flow in a circuit. In direct current (DC), the electric charge (current) only flows in one…

• A. Four times
• B. same as
• C. Sixteen times
• D. double

Explanation: Efficiency (η) = DC Power Output / AC power inputTherefore, the efficiency of a full wave rectifier (ηf) is 81.2% (calculated)And, the…

• A. Diode
• B. Transistor
• C. Transformer
• D. Inductor

Explanation: A rectifier used a diode in its circuit, the diode allows one-directional flow of current in the circuit hence converting AC to DC.

• A. Gamma rays
• B. Infrared radiation
• C. Ultraviolet radiation
• D. Visible light

Explanation: Gamma rays are not typically emitted during electronic transition. Gamma rays have the highest energy and shortest wavelength among the…

• A. Rectifier
• B. On switch
• C. Inverter
• D. Off switch
• E. Amplifier

Explanation: A reverse-biased semiconductor diode can be thought of as an off switch because it prevents current from flowing through the circuit…

• A. Photons
• B. Electrons
• C. Protons
• D. Holes
• E. Neutrons

Explanation: In n-type semiconductors, the minority charge carriers are **holes**. These are created when electrons from the valence band are excited…

• A. One diode connected in bridge-type arrangements
• B. Two diodes connected in bridge-type arrangements
• C. Three diodes connected in bridge type arrangements
• D. Four diodes connected in a bridge type arrangement

Explanation: For a full wave rectification, four diodes connected in a bridge type arrangement are needed.

• A. Gigaamperes
• B. Kiloamperes
• C. Megaamperes
• D. Microamperes

Explanation: The reverse current in a reverse-biased PN junction is of the order of microamperes to nanoamperes, indicating a very small current…

• A. YES operation
• B. NOT operation
• C. AND operation
• D. OR operation

Explanation: "YES" operation is equivalent to having a direct input. It is usually implied rather then stated as an operation.It doesn't transform or…

• A. Amplification
• B. Attenuation
• C. Filtration
• D. Rectification

Explanation: Rectification - Correct: Rectification is the process of converting AC to DC, typically using diodes.

• A. The depletion region is reduced and barrier height is increased
• B. The depletion region is widened and barrier height is reduced
• C. Both the depletion region and barrier height are reduced
• D. Both the depletion region and barrier height are increased

Explanation: When a P-N junction diode is forward-biased, the external voltage reduces the potential barrier, allowing charge carriers to move across…

• A. 6
• B. 5
• C. 4
• D. 3

Explanation: To convert a germanium crystal into a P-type semiconductor, an element with a valence of 3, such as boron, is added.

• A. NP>Ne
• B. NP=Ne
• C. NP<Ne
• D. NP>Ne or NP<Ne depending on the nature of impurity

Explanation: In extrinsic semiconductors, doping introduces impurities that significantly alter the balance of charge carriers.