In forward blocking mode of a thyristor________?

Related Mcqs:

1. In reverse 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 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. 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

4. In BJT, the forward biased base emitter junction inject holes from base to emitter, the holes_______?

   A. Do not contribute to the collector current
   B. Result in net current flow component into the base
   C. Contribute to the collector current
   D. Only (a) and (b)
   E. Only (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 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

9. 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

10. Typical range of thyristor turn OFF time is______________?

    A. 3 – 10 µs
    B. 3 – 50 µs
    C. 3 – 100 µs
    D. 3 – 500 µs