During gate recovery time_____________?

Related Mcqs:

1. For an SCR gate – cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance_____?

   A. 111.9 Ω.
   B. 11.19 Ω.
   C. 108 Ω.
   D. 115 Ω

2. 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

3. 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

4. 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

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. 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

7. If the gate voltage of an SCR is removed, then the_______________?

   A. anode current decreases
   B. anode current does not decrease at all
   C. anode current increases
   D. cathode current increases

8. The most suited gate pulses given to the AC regulator with R – L load can be in the form of____________?

   A. Continuous signal
   B. Large isolating pulse transformer
   C. A train of pulses
   D. None of these

9. With gate open, the maximum anode current at which SCR is turned off from ON condition is called____________?

   A. breakdown voltage
   B. peak reverse voltage
   C. holding current
   D. latching current

10. The phase angle of gate signal in TRIAC can be shifted by using_____________?

    A. A capacitor
    B. A variable resistor
    C. An inductor
    D. Only (a) and (b)