On this page, we will review the Analog Electronics Short Notes PDF Part 24. Welcome to Poly Notes Hub, a leading destination for analog electronics notes for engineering students.
Author Name: Arun Paul
Analog Electronics Short Notes Pdf Part 24
Here we have listed some analog electronics short notes for all types of exams like diploma engineering, degree engineering, and GATE exam and many more. In every page, we have listed 10 short analog electronics questions and answers and anyone can download it by a single click for future use.
1. What is Switching Circuit?
A switching circuit is an electronic circuit that turns current on or off in a device or system. It acts like a controller that decides when power should flow or stop flowing. Switching circuits are commonly used in digital electronics, power supplies, and control systems.
2. What is Switch?
A switch is a device that opens or closes an electrical circuit. When it is closed (ON), current flows through the circuit. When it is open (OFF), the flow of current is interrupted.
3. What is Mechanical Switch?
A mechanical switch is a manually or physically operated switch, such as a push button, toggle, or rotary switch. It uses moving parts to make or break a connection in the circuit.
4. What are the limitations of Mechanical Switch?
- Wear and tear due to moving parts.
- Slow operation compared to electronic switches.
- Contact bounce (unwanted rapid on-off switching).
- Limited life span because of friction and corrosion.
- Not suitable for high-speed switching or automation.
5. What is Relay or Electromechanical Switch?
A relay is an electromechanical switch that uses an electromagnet to open or close a circuit. When current flows through the coil of the relay, it generates a magnetic field that moves a switch contact.
6. What are the terminals of relay?
A typical relay has the following terminals:
- Coil Terminals – two pins for energizing the internal coil.
- Common (COM) – the movable contact.
- Normally Open (NO) – connected to COM when the relay is energized.
- Normally Closed (NC) – connected to COM when the relay is not energized.
7. What are the advantages of Electromechanical Switch?
- Electrical isolation between control and output circuits.
- Can switch high voltages and currents using low power signals.
- Reliable operation for mechanical systems.
- Simple design and easy to use.
8. What is Electronic Switch?
An electronic switch is a switch with no moving parts that controls current flow using semiconductor devices like transistors, thyristors, or MOSFETs.
9. What are the advantages of electronic switches?
- Faster switching speed.
- No mechanical wear or contact bounce.
- Compact and lightweight.
- More reliable and longer lifespan.
- Low power consumption.
10. What is Switching Transistor?
A switching transistor is a transistor that operates as an ON/OFF switch. In saturation mode, it acts like a closed switch (ON), and in cutoff mode, it acts like an open switch (OFF). Switching transistors are used in logic gates, power supplies, motor controllers, and digital systems.