Double edge modulation eliminates certain harmonics when the reference is a__________?

Related Mcqs:

1. A combination of synchronized leading edge and trailing edge modulation has also been used to control a____________?

   A. Boost single – phase power factor converter
   B. A buck dc – dc converter to reduce ripple in the intermediate dc bus capacitor
   C. Both A. and B.
   D. None f these

2. 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

3. 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

4. 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

5. Unipolar modulation is generally used in____________?

   A. AC – AC converters
   B. AC – DC converters
   C. DC – AC converters
   D. DC – DC converters

6. 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

7. Very large values of modulation index (greater than 3.24) lead to___________?

   A. Square AC output voltage
   B. Sine AC output voltage
   C. Triangular AC output voltage
   D. Trapezoidal AC output voltage

8. Double fourier series analysis of PWM is_____________?

   A. Two dimensional functions
   B. Three dimensional functions
   C. One dimensional functions
   D. All of these

9. 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)

10. A power MOSFET has three terminals called___________?

    A. Collector, emitter and gate
    B. Drain, source and gate
    C. Drain, source and base
    D. Collector, emitter and base