Which triggering is the most reliable____________?

Related Mcqs:

1. Gate circuit or triggering circuit of a thyristor is

   A. lower power circuit.
   B. high power circuit.
   C. magnetic circuit.
   D. may be low power or high power circuit

2. An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be_____?

   A. 1500 A.
   B. 6000 A.
   C. 2121.32 A.
   D. 4242.64 A.

3. Thyristor can be protected from over voltages by using

   A. 23 mA.
   B. 40 mA.
   C. 10 mA.
   D. 60 mA.

4. Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then________________?

   A. Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.
   B. Vc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3.
   C. Vc1 = Vc2 = Vc3 any value of Ig.
   D. Vc1 > Vc2 > Vc3 when Ig1 ≥ Ig2 &Atil

5. COOLMOS device can be used in application up to power range of___________?

   A. 1 KVA
   B. 2 KVA
   C. 500 VA
   D. 100 KVA

6. During which time maximum conduction spreading take place in the thyristor during turn ON?

   A. Delay time
   B. Spread time
   C. Rise time
   D. Same for every case

7. IGBT stands for___________?

   A. Insulated gate bipolar transistor
   B. Insulated gate bidirectional transistor
   C. Inductive gate bipolar transistor
   D. Inductive gate bidirectional transistor

8. The main objective of static power converters is to____________?

   A. Obtain an dc output waveform from a dc power supply
   B. Obtain an ac output waveform from a dc power supply
   C. Obtain an dc output waveform from a dc power supply
   D. Obtain an ac output waveform from a ac power suppl

9. The on – state voltage drop of IGBT consists of__________?

   A. Drop across the collector junction
   B. Drop across the drift region
   C. Drop across MOSFET portion
   D. All of these

10. The ac voltage controller can be used for ___________?

    A. Lighting and heating control
    B. On – line transformer tap changing
    C. Soft starting
    D. All of these