In reverse blocking mode of a thyristor______?

Related Mcqs:

1. In forward blocking mode of a thyristor________?

   A. junction J2 is in reverse bias and J1, J3 is in forward bias.
   B. junction J3 is in forward bias and J1, J2 is in reverse bias.
   C. Junction J1, J3 is in reverse bias and J2 is in forward bias.
   D. Junction J1 and J2 is in forward bias and J3 is in reverse bias.

2. In a single phase full wave rectifier, during blocking state the pea inverse voltage of diode is______________?

   A. V m
   B. 2 V m
   C. V m / 2
   D. 4 V m

3. The reverse recovery time of diode is trr = 3 μs and the rate off all of the diode current is di/dt = 30 A/μs. The storage charge current QRR is___________?

   A. 130 μs
   B. 135 μs
   C. 140 μs
   D. 145 μs

4. During reverse recovery time__________________?

   A. charge carrier of junction J2 recombined
   B. charge carrier of junction J1 is swept out
   C. charge carrier of junction J3 is swept out
   D. both B and C

5. A single phase full bridge inverter can operated in load commutation mode in case load consist of______?

   A. RL.
   B. RLC underdamped.
   C. RLC overdamped.
   D. RLC critically damped

6. A single phase full bridge inverter can operate in load commutation mode in case load consists of____________?

   A. RL.
   B. RLC underdamped.
   C. RLC overdamped.
   D. RLC critically damped.

7. In square wave operation mode of 3 phase VSI, the VSI

   A. Can control the load voltage
   B. Cannot control the load voltage
   C. Cannot control the load voltage except by means of dc link voltage
   D. Cannot control the load voltage except by means of dc link current

8. A thyristor equivalent of a thyratron tube is a _________?

   A. Diac
   B. Triac
   C. Silicon controlled-rectifier SCR
   D. None of above

9. Which of the following is disadvantage of fast recovery diodes?

   A. Recovery is only 5 µs
   B. Recovery is only 50 µs
   C. Doping is carried out
   D. None of these

10. The switching function of semiconductor devices can be characterized with____________?

    A. Duty ratio only
    B. Frequency only
    C. Duty ratio and frequency
    D. Duty ratio, frequency and time delay