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

Related Mcqs:

1. 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

2. 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

3. In a 3 phase VSI SPWM to use a single carrier signal and preserve the features of PWM technique, the normalized carrier frequency should be____________?

   A. Multiple of two
   B. Odd multiple of three
   C. Odd multiple of five
   D. Odd multiple of seven

4. 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

5. 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

6. In the SPWM, the modulating signal is___________?

   A. Square
   B. Sinusoidal
   C. Triangular
   D. Saw – tooth

7. In a full bridge VSI, in order to avoid the short circuit across the DC bus and the undefined AC output voltage condition, the modulating technique should ensure that___________?

   A. Top switch of each leg is on at any instant
   B. Bottom switch of each leg is on at any instant
   C. Either A. or B.
   D. None of these

8. CB used for over current protection of thyristor operates when the fault current is__________?

   A. of long period
   B. of short duration
   C. both (A) and (B)
   D. neither (A) nor (B)

9. The carrier which are commonly used in constant – frequency PWM is______________?

   A. Sawtooth carrier
   B. Inverted sawtooth carrier
   C. Triangle carrier
   D. All of these

10. In bipolar modulation, the carrier is symmetric about zero with amplitude equal to Cm, the PWM output

    A. Zero
    B. Switches between – 1 / 2 and + 1 / 2
    C. Switches between – 1 and + 1
    D. Switches between 0 and + 1