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

Related Mcqs:

1. A modern power semiconductor device that combines the characteristic of BJT and MOSFET is_____________?

   A. IGBT
   B. FCT
   C. MCT
   D. GTO

2. In BJT, switching losses occurs___________?

   A. Only at turn – on
   B. Only at turn – off
   C. Both at turn on and off
   D. None of these

3. In radiative coupling, the emitter radiation field_____________?

   A. Decays as 1 / R, where R is the separation distance between the emitter and the receptor
   B. Decays as R, where R is the separation distance between the emitter and the receptor
   C. Decays as 1 / 2 R, where R is the separation distance between the emitter and the receptor
   D. Decays as 2R, where R is the separation distance between the emitter and the receptor

4. The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?

   A. 600 V/µs
   B. 800 V/µs
   C. 1200 V/µs
   D. 1000 V/µs

5. Number of PN junction in an SCR is____________?

   A. Two
   B. Three
   C. Four
   D. Five

6. 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.

7. 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

8. In the operation and control of both naturally commutated and forced commutated SCR base converter, commutation plays an important role. The converters is / are ___________?

   A. AC – DC
   B. DC – DC
   C. DC – AC
   D. All of these

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

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

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