On this page, we will review the Analog Electronics Short Notes PDF Part 28. 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 28
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 SCR or Silicon Controlled Rectifier?
An SCR is a three-terminal semiconductor device used to control high power. It acts like a switch that can turn on by a gate signal but turns off only when the current drops below a certain level. It is widely used in rectifiers, motor controls, and power regulation circuits.
2. What are the terminals of SCR?
The three terminals of an SCR are:
- Anode (A)
- Cathode (K)
- Gate (G)
3. What is the operation of SCR?
When a positive voltage is applied to the anode with respect to the cathode, the SCR remains OFF (non-conducting) until a gate pulse is given. When a gate current is applied, the SCR turns ON and continues to conduct even if the gate signal is removed, as long as the current remains above the holding current. It turns OFF only when the current drops below this level.
4. What is Thyristor?
A thyristor is a general name for a family of semiconductor devices (including SCRs) that act as latching switches. The SCR is the most basic form of a thyristor.
5. What is Breakover Voltage in SCR?
Breakover voltage is the minimum forward voltage at which the SCR turns ON without any gate signal. Beyond this voltage, the SCR switches to its conducting state automatically.
6. What is Holding Current in SCR?
Holding current is the minimum current that must continue to flow through the SCR to keep it ON. If the current drops below this level, the SCR turns OFF.
7. What is Peak Reverse Voltage in SCR?
Peak Reverse Voltage (PRV) is the maximum voltage the SCR can withstand in the reverse direction (anode negative w.r.t cathode) without breaking down.
8. What is Circuit Fusing Rating in SCR?
This rating indicates the maximum current-time product the SCR can handle during a short-circuit or fault before it gets damaged. It helps in selecting fuses or protection devices for the circuit.
9. What is Forward Current Rating in SCR?
This is the maximum continuous forward current the SCR can handle without overheating or being damaged.
10. What is Forward Conduction Region in SCR?
This is the region in the SCR’s operation where it conducts current after being turned ON by a gate pulse. In this region, the anode is positive with respect to the cathode, and the device offers low resistance to current flow.