Electronic Mechanic theory basic mcq questions and answers

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Electronic Mechanic Theory Basic MCQ Questions and Answers नीचे दिया गया है

Question 1: What is the purpose of a diode in an electronic circuit?

A. To amplify electrical signals

B. To regulate voltage

C. To store electrical charge

D. To control current flow

Answer: D. To control current flow

Explanation: A diode is a two-terminal electronic component that allows current to flow in only one direction. It acts as a switch and allows current to pass through when the voltage is positive (forward biased) but blocks the flow of current when the voltage is negative (reverse biased). This property makes diodes useful for controlling the direction of current flow in circuits.

Question 2: Which component is used to store electrical charge in an electronic circuit?

A. Resistor

B. Capacitor

C. Transistor

D. Inductor

Answer: B. Capacitor

Explanation: A capacitor is an electronic component that stores electrical charge. It consists of two conductive plates separated by an insulating material called a dielectric. When a voltage is applied across the plates, charge accumulates on the plates, creating an electric field between them. Capacitors are commonly used in electronic circuits for various purposes, such as smoothing power supply voltages, timing circuits, and filtering signals.

Question 3: What is the purpose of a transistor in an electronic circuit?

A. To regulate voltage

B. To amplify electrical signals

C. To store electrical charge

D. To control current flow

Answer: B. To amplify electrical signals

Explanation: A transistor is a three-terminal semiconductor device that can amplify electrical signals and act as a switch in electronic circuits. It consists of three layers of semiconductor material, namely the emitter, base, and collector. By controlling the current flowing through the base terminal, the transistor can amplify small input signals to produce larger output signals. Transistors are essential components in many electronic devices, such as amplifiers, radios, and computers.

Question 4: Which component is used to regulate voltage in an electronic circuit?

A. Resistor

B. Capacitor

C. Transistor

D. Voltage regulator

Answer: D. Voltage regulator

Explanation: A voltage regulator is a specialized electronic component or circuit that is used to maintain a steady output voltage regardless of changes in input voltage or load conditions. It is commonly used to provide stable and regulated power supply voltages to sensitive electronic devices. Voltage regulators can be implemented using various techniques, such as using integrated circuits (ICs) specifically designed for voltage regulation or through discrete components and feedback control circuits.

Question 5: Which component is used to control the speed of an electric motor in an electronic circuit?

A. Capacitor

B. Transistor

C. Resistor

D. Potentiometer

Answer: B. Transistor

Explanation: A transistor can be used to control the speed of an electric motor in an electronic circuit. By varying the current or voltage applied to the motor using the transistor, the speed of the motor can be adjusted. This can be achieved by using a transistor in a switching configuration or by using it as an amplifier to control the motor's power supply. Transistors provide precise control over the motor speed and are commonly used in applications such as motor speed controllers and robotics.

Question 6: Which component is used to convert alternating current (AC) to direct current (DC) in an electronic circuit?

A. Resistor

B. Diode

C. Transistor

D. Inductor

Answer: B. Diode

Explanation: A diode is commonly used to convert alternating current (AC) to direct current (DC) in electronic circuits. When an AC voltage is applied to a diode, it allows the current to flow in one direction during the positive half-cycle and blocks it during the negative half-cycle, effectively converting AC to DC. This process is known as rectification, and diodes used for rectification purposes are often referred to as rectifier diodes. Rectification is an essential step in power supply circuits and many other applications where a steady DC voltage is required.

Question 7: Which component is used to amplify and shape electrical signals in an audio amplifier circuit?

A. Resistor

B. Capacitor

C. Transistor

D. Transformer

Answer: C. Transistor

Explanation: Transistors are commonly used to amplify and shape electrical signals in audio amplifier circuits. The transistor amplifies weak input signals from audio sources, such as microphones or musical instruments, to a level suitable for driving speakers or headphones. Transistors can be used in different amplifier configurations, such as common emitter, common base, or common collector, depending on the desired characteristics of the amplifier. The amplification provided by transistors allows for the faithful reproduction of audio signals with sufficient power to drive speakers or headphones.

Question 8: Which component is used to store and retrieve digital data in computer memory?

A. Resistor

B. Capacitor

C. Transistor

D. Magnetic disk

Answer: D. Magnetic disk

Explanation: Magnetic disks, such as hard disk drives (HDDs) and solid-state drives (SSDs), are used to store and retrieve digital data in computer memory. These storage devices use magnetic fields to write and read data onto and from the disk surfaces. HDDs consist of rotating disks coated with a magnetic material, while SSDs use flash memory chips to store data electronically. Both types of storage devices provide non-volatile storage for computer systems, allowing for the long-term storage and retrieval of digital information.

Question 9: Which component is used to protect electronic circuits from excessive current?

A. Resistor

B. Fuse

C. Transistor

D. Inductor

Answer: B. Fuse

Explanation: A fuse is used to protect electronic circuits from excessive current by interrupting the flow of current when it exceeds a certain threshold. Fuses consist of a thin wire or strip of metal that melts when a high current passes through it, breaking the circuit and protecting the components downstream. Fuses are designed to be easily replaceable, providing a sacrificial element that breaks before any damage can occur to the circuit or the components connected to it.

Question 10: Which component is used to generate a stable clock signal in digital circuits?

A. Resistor

B. Capacitor

C. Transistor

D. Crystal oscillator

Answer: D. Crystal oscillator

Explanation: A crystal oscillator is used to generate a stable clock signal in digital circuits. It utilizes the piezoelectric properties of a quartz crystal to provide a precise and constant frequency output. The crystal oscillator circuit resonates at a specific frequency determined by the physical characteristics of the crystal. Clock signals generated by crystal oscillators are essential for synchronizing the operations of digital circuits, such as microprocessors, memory modules, and communication systems.

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