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

Related Mcqs:

1. 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

2. The ac output voltage waveform of VSI and AC output current waveform of CSI respectively is composed of___________?

   A. High dv / dt, low di / dt
   B. Low dv / dt, low di / dt
   C. Low dv / dt, high di / dt
   D. High dv / dt, high di / dt

3. In a 3 phase VSI out of eight valid states, the number of valid states that produce zero ac line voltages is/are_________?

   A. One
   B. two
   C. Three
   D. Four

4. For similar carrier and modulating signals, the line current used in CSI is__________?

   A. Identical to line voltage in a VSI
   B. Identical to line current in VSI
   C. Identical to phase voltage in VSI
   D. Identical to phase voltage in CSI

5. For similar carrier and modulating signals, the line current used in CSI is_____________?

   A. Identical to line voltage in a VSI
   B. Identical to line current in VSI
   C. Identical to phase voltage in VSI
   D. Identical to phase voltage in CSI

6. 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

7. Harmonics in 3 phase inverters can be reduced by using___________?

   A. Passive filter
   B. Active filter
   C. Both passive and active filters
   D. None of these

8. 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

9. Under harmonic free load voltages, the 3 phase VSI_____________?

   A. Does not contains second harmonic
   B. Does not contains third harmonic
   C. Does not contains fifth harmonic
   D. Does not contains seventh harmonic

10. A carrier based PWM technique in CSI is composed of____________?

    A. A switching pulse generator and a shorting pulse generator
    B. A shorting pulse distributor
    C. A switching and shorting pulse combination
    D. All of these