As the breakdown voltage reached, the DIAC exhibits?

Related Mcqs:

1. DIAC are specifically designed to trigger______________?

   A. TRIAC
   B. SCR
   C. GTO
   D. Only (a) and (b)

2. DIAC and TRIAC both are semiconductors devices and conduct in____________________?

   A. DIAC conducts in forward direction and TRIAC conducts in reverse direction
   B. Both conducts in forward direction
   C. Both conducts in reverse direction
   D. Both conducts in either direction

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

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

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. 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

7. In current commutated DC-DC choppers, the voltage spike appears across the load when_____________?

   A. Voltage across the commutating inductances collapses
   B. The capacitance voltage adds to the supply voltage
   C. Both A. and B.
   D. None of these

8. A capacitive load in voltage source inverters generates ________________?

   A. Small current spikes and can be reduced by using an inductive filter
   B. Large current spikes and can be increased by using an inductive filter
   C. Small current spikes and can be increased by using an inductive filter
   D. Large current spikes and can be reduced by using an inductive filter

9. In a three phase voltage source inverters____________?

   A. Only amplitude of voltage is controllable
   B. Only phase is controllable
   C. Both amplitude and phase is controllable
   D. Amplitude, phase and frequency of voltages should always be controllable

10. In a 3 phase half wave rectifier, when firing angle is less than 90 degree, then the average dc output voltage becomes__________________?

    A. Positive
    B. Negative
    C. Zero
    D. None of these