These can be some of the areas to be questioned. The questions are not designed as per the requirements as it is intended to demonstrate the possible ares to be asked.
1. Why diode is place in series to LED?.
To protect the LED against reverse voltage.
2. In NPN transistor, what is P?.
3. What type of pulse trigger for SCR?
4. When SCR start to conduct , when does it stop?
5. Transistor is saturated, what happen to the resistance?
6. A capacitor is used to separate multistage amplifier, what is the effect of the capacitor.
7. To be used as amplifier, the transistor must be biased at which region?
8. Ops Am, + connected to earth, what type of amplifier?
9. How do you control the gain of an operational amplifier?
10. The process of adding impurities to semiconductor is called….
11. Where is/are the traces in a Multilayed PCB?
Traces are the copper connectors either at the top/bottom or is some PCB in the core.
12. What is/are the PCB substrate is made from?
substrate is the base of PCB, it is made from insulation material such as fibre glass or resined paper.
13. After the components are soldered, the PCB is environmentally sealed by using ………. Coating.
The coating is called conformal coating, it provides the protection but easier to remove the components.
14. How is the DIP ic being mounted on PCB?.
15. When testing diode, you have low resistance in both ways, what does this show?.
16. What type of component the 3N123? .
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