1) Why thyristor is also called bilicor-controlled rectifier (SCR)?
2) How many layers and junctions are there in a basic thyristors?
3) How many terminals are there and what are they?
4) How the thyristor is turned on?
5) How the turnoff is achieved?
6) Basically how many classifications of thyristors are there and what are they?
7) What is converter-grade thyristor?
8)What is inverter grade thyristor?
9) Where does Inverter-grade thyristor used?
10) What is forward voltage drop in thyristor?
11) What is a triac?
12) What is GTO?
13) Why there is no need for external commutation circuit to turn it off?
14) What is reverse-conducting thyristor (RCT)?
15) What is asymmetrical silicon controlled rectifier (ASCR)?
16) How is power transistor turned ON or OFF?
17) What is Darlington configuration?
18) Define RBSOA and FBSOA?
19) What are the voltage-driver devices?
20) What are the current-driver devices?
21) What is power MOSFET?
22) What is insulated-gate bipolar transistor (IGBT)?
23) How IGBT is different from MOSFET?
24) How is IGBT turned ON and OFF?
25) In general how IGBT’s are classified?
26) Why PT (punch through) IGBT’s cannot be used as easily paralleled as MOSFET?
27) Why NPT (non punch through) IGBT’s can be paralleled?
28) What is MOS-controlled thyristor (MCT)?
29) What is the advantage of MCT over IGBT?
30) What is a diode?
31) Define peak inverse voltage of a diode?
32) What is maximum surge current?
33) How a power diode is tested?
34) What are the elements against which power diodes must be protected?
35) Why a RC series circuit is connected across the diode?
36) What is schottky diode?
37) What are the advantages of schottky diode over a normal diode?
38) How schottky diodes are tested?
39) What is a DIAC?
40) What is silicon controlled switch?
41) Why silicon controlled switch has two gates?
42) What are the power Bi-polar junction transistors?
43) How many layers are there in a transistor and what are they?
44) What are the types of transistors?
45) How BJT is tested?
46) What is break down voltage in MOSFET?
47) What is dynamic avalanche in GTO?
48) What are choppers?
49) What are the functions of switch mode power supplies (SMPS)?
50) What is one -quadrant choppers?
51) What is two -quadrant choppers?
52) What is four -quadrant choppers?
53) What are buck converters?
54) What are boost converters?
55) What is co-converter?
56) What are the important diode current characteristics in single phase half wave rectifier?
57) What are the important diode voltage characteristics in single phase half wave rectifier?
58) What are the differences between controlled and un-controlled rectifiers?
59) Why diode rectifiers generate harmonics?
60) What are the harmonic mitigating techniques?
61) Why SCR’s are connected in series and parallel combinations?
62) What are the two major problems during series connection of the devices?
63) What are the primary methods in common use of triggering series connected SCR’s?
64) What is string efficiency of SCR’s connected in series / parallel?
65) What is Derating of SCR’s?
66) Explain principle of chopper operation?
67) What are the two types of control strategies for operating the switches are employed in DC choppers?
68) What are step-up choppers?
69) What are step-down choppers?
70) Explain the various chopper configurations?
71) What are the different types of commutations techniques n chopper?
72) Explain AC Regulator?
73) What are the types of single phase regulators?
74) What are the six different methods of commutation by which thyristors may be turned off?
75) What is holding current and latching current?
76) What is meant by di/dt rating of thyristor?
77) What is the use of pulse transformer in triggering circuits?
78) What is pedestal and ramp triggering?
79) What is the difference between mid-point converters and bridge converters?
80) What is the use of free wheeling diode?
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