Example of a voltage clamping device______________?

Related Mcqs:

1. Under over voltage condition impedance offered by the voltage clamping device is__________?

   A. low B. High C. moderate D. infinity...

2. Under normal operating condition voltage clamping device offers impedance of_________?

   A. high value. B. low value. C. zero value. D. moderate value....

3. A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is_____?

   A. 0.32 B. 0.67 C. 0.45 D. 0.27...

4. A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is _____?

   A. 30° to 150°. B. 30° to 180°. C. 60° to 120°. D. 60° to 180°....

5. 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...

6. A thyristor string is made of a no. of SCR connected in series and parallel. The string have volume and current of 11 KV and 4 KA. The voltage and current rating of available SCRs are 1800 V and 1000 A. For a string efficiency of 90 % let the number of SCRs in series and parallel are a and b respectively. Then the value of a and b will be_____________?

   A. 5, 7 B. 4, 6 C. 7, 5 D. 6, 4...

7. 4 thyristors rated 200 V in series. The operating voltage of the string is 600 V. Derating factor of the string is_____________________?

   A. 0.75 B. 0.7 C. 0.2 D. 0.25...

8. Voltage commutation circuit can be converted into a current commutation by interchanging the positions of____________?

   A. Diode and capacitor B. Capacitor and SCR C. Inductor and capacitor D. Capacitor and load...

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. In a full bridge VSI, in order to avoid the short circuit across the DC bus and the undefined AC output voltage condition, the modulating technique should ensure that___________?

    A. Top switch of each leg is on at any instant B. Bottom switch of each leg is on at any instant C. Either A. or B. D. None of these...