For commutation in three phase PAC, normally balanced three phase voltages VR, VY and VB are connected to the three legs of the converter via______________?

Related Mcqs:

1. In a 3 phase CSI, if the required line output voltages are balanced and 120 degree out of phase, then the chopping angles are used to eliminate only the harmonics at frequencies

   A. 5
   B. 7
   C. 11
   D. All of these

2. In commutation PAC stands for_______?

   A. Permanent angle converter
   B. Phase angle converter
   C. Phase angle commutation
   D. Phase and commutation

3. During the commutation period in 3 phase converter, overlap time is_____________?

   A. Dependent on the load current
   B. Dependent on the voltage
   C. Dependent on both the load current and load voltage behind the short circuit current
   D. Independent on both the load current and load voltage

4. During the commutation period in 3 phase converter, overlap time is____________?

   A. Dependent on the load current
   B. Dependent on the voltage
   C. Dependent on both the load current and load voltage behind the short circuit current
   D. Independent on both the load current and load voltage

5. Voltage commutation circuit can be converted into a current commutation by interchanging the positions of____________?

   A. Diode and capacitor
   B. Capacitor and SCR
   C. Inductor and capacitor
   D. Capacitor and load

6. 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

7. If all the SCR’s of 3 phase PAC is replaced by diodes, they would be triggered_____________?

   A. 120 degree after the zero crossing of the corresponding line voltages
   B. 60 degree after the zero crossing of the corresponding line voltages
   C. 120 degree before the zero crossing of the corresponding line voltages
   D. 60 degree before the zero crossing of the corresponding line voltages

8. In a flyback converter, the inductor of the buck-boost converter has been replaced by a_____________?

   A. Flyback capacitor
   B. Flyback resistor
   C. Flyback transformer
   D. Flyback transistor

9. In a three phase converter, the number of notches per cycle is____________?

   A. One
   B. Three
   C. Six
   D. Nine

10. 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