MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Power Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The waveform obtained by __________ is more near to a sinusoidal wave |
| A. | PWM inverters |
| B. | Stepped wave inverters |
| C. | parallel connected inverters |
| D. | None of the mentioned |
| Answer» C. parallel connected inverters | |
| 2. |
In single-phase modulation of PWM inverters, the 5th order harmonic can be eliminated if the pulse width is made equal to ___________ |
| A. | 30° |
| B. | 36° |
| C. | 72° |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 3. |
In single-phase modulation of PWM inverters, the lowest harmonic can be eliminated if the pulse width is made equal to __________ |
| A. | 30° |
| B. | 0° |
| C. | 120° |
| D. | 60° |
| Answer» D. 60° | |
| 4. |
IN_SINGLE-PHASE_MODULATION_OF_PWM_INVERTERS,_THE_5TH_ORDER_HARMONIC_CAN_BE_ELIMINATED_IF_THE_PULSE_WIDTH_IS_MADE_EQUAL_TO____________?$ |
| A. | 30° |
| B. | 36° |
| C. | 72° |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 5. |
The waveform obtained by __________ is more near to a sinusoidal wave$ |
| A. | PWM inverters |
| B. | Stepped wave inverters |
| C. | parallel connected inverters |
| D. | None of the mentioned |
| Answer» C. parallel connected inverters | |
| 6. |
In single-phase modulation of PWM inverters, the lowest harmonic can be eliminated if the pulse width is made equal to _________? |
| A. | 30° |
| B. | 0° |
| C. | 120° |
| D. | 60° |
| Answer» D. 60¬¨¬®‚Äö√†√ª | |
| 7. |
In three-level modulation |
| A. | the output voltage is zero in the first half cycle. |
| B. | the output voltage either zero or positive in the first half cycle. |
| C. | the output voltage either zero or negative in the first half cycle. |
| D. | the output voltage either zero, positive or negative in the first half cycle. |
| Answer» E. | |
| 8. |
In stepped wave inverters, one of the inverters are gated such as to obtain |
| A. | one level modulation |
| B. | two level modulation |
| C. | zero level modulation |
| D. | none of the mentioned |
| Answer» C. zero level modulation | |
| 9. |
In case of stepped wave inverters, |
| A. | both the transformers have 1:1 turns ratio |
| B. | both the transformers have 1:2 turns ratio |
| C. | both the transformers have different transformer ratio |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 10. |
Pulses of different widths and heights are superimposed in case of __________ harmonic reduction technique. |
| A. | transformer connection |
| B. | pulse width modulation |
| C. | stepped-wave inverter |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 11. |
The output voltage obtained by connecting two inverters through a transformer is a |
| A. | square wave |
| B. | sine wave |
| C. | quasi-square wave |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 12. |
For harmonic reduction by transformer connection, the output voltages from the two inverters must be |
| A. | similar and in-phase with each other |
| B. | dissimilar but in-phase with each other |
| C. | similar but phase shifted from each other |
| D. | dissimilar and phase shifted from each other |
| Answer» D. dissimilar and phase shifted from each other | |
| 13. |
Which of the following is used as a harmonic reduction technique in inverters? |
| A. | Amplitude modulation |
| B. | Cycloconverter control |
| C. | Transformer connection |
| D. | Series connection of two inverters |
| Answer» D. Series connection of two inverters | |