In a square – wave operation of 3 phase CSIs, the power values are on for___________?

Related Mcqs:

1. The square wave operation of 3 phase VSI lines contains the harmonics. The amplitudes are____________?

   A. Directly proportional to their harmonic order
   B. Inversely proportional to their harmonic order
   C. Not related to their harmonic order
   D. None of these

2. 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

3. 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

4. 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

5. 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

6. n a phase controlled 3 phase ac voltage controller, the harmonic present is__________?

   A. 2nd
   B. 3rd
   C. 5th
   D. 7th

7. 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______________?

   A. Three inductances
   B. Three capacitances
   C. Three resistance
   D. Three transistors

8. IGBT stands for___________?

   A. Insulated gate bipolar transistor
   B. Insulated gate bidirectional transistor
   C. Inductive gate bipolar transistor
   D. Inductive gate bidirectional transistor

9. The IGBT resulted in higher switching speed and lower energy losses. It can be used for___________?

   A. Uninterruptible power supplies
   B. Induction heating system
   C. Constant voltage and frequency power supplies
   D. All of these

10. The maximum firing angle in the half wave controlled regulator is_____________?

    A. 180 degree
    B. 190 degree
    C. 200 degree
    D. 210 degree