MCQOPTIONS
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MCQOPTIONS
This section includes 14 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. |
In pulse width modulation |
| A. | the output voltage is modulated |
| B. | the input voltage is modulated |
| C. | the gating pulses are modulated |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 2. |
Which of the following is not a PWM technique? |
| A. | Single-pulse width modulation |
| B. | Multiple-pulse width modulation |
| C. | Triangular-pulse width modulation |
| D. | Sinusoidal-pulse width modulation |
| Answer» D. Sinusoidal-pulse width modulation | |
| 3. |
In the PWM method |
| A. | external commutating capacitors are required |
| B. | more average output voltage can be obtained |
| C. | lower order harmonics are minimized |
| D. | higher order harmonics are minimized |
| Answer» D. higher order harmonics are minimized | |
| 4. |
__________ method is an internal method for controlling the inverter output voltage. |
| A. | series connection of inverters |
| B. | chopper method |
| C. | commutating capacitor |
| D. | pulse width modulation |
| Answer» E. | |
| 5. |
WHICH_OF_THE_FOLLOWING_IS_NOT_A_PWM_TECHNIQUE??$ |
| A. | Single-pulse width modulation |
| B. | Multiple-pulse width modulation |
| C. | Triangular-pulse width modulation |
| D. | Sinusoidal-pulse width modulation |
| Answer» D. Sinusoidal-pulse width modulation | |
| 6. |
In_pulse_width_modulation$ |
| A. | the output voltage is modulated |
| B. | the input voltage is modulated |
| C. | the gating pulses are modulated |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 7. |
In the PWM metho? |
| A. | external commutating capacitors are required |
| B. | more average output voltage can be obtained |
| C. | lower order harmonics are minimized |
| D. | higher order harmonics are minimized |
| Answer» D. higher order harmonics are minimized | |
| 8. |
__________ method is an internal method for controlling the inverter output voltage. |
| A. | series connection of inverters |
| B. | chopper method |
| C. | commutating capacitor |
| D. | pulse width modulation |
| Answer» E. | |
| 9. |
In the external control of dc input voltage |
| A. | a chopper is placed just after the inverter block |
| B. | a chopper is placed just after the filter block |
| C. | a chopper is placed before the filter and the inverter block |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 10. |
External control of dc input voltage can be obtained by the use of a |
| A. | transformer |
| B. | chopper |
| C. | inverter |
| D. | converter |
| Answer» C. inverter | |
| 11. |
In case of the series inverter control, if two inverters are connected in series through a transformer, and two secondary voltages are V1 and V2, then the resultant output is given by |
| A. | V1 + V2 |
| B. | ‚àö(V1<sub>2</sub> + V2<sub>2</sub>) |
| C. | [V1<sub>2</sub> + V2<sub>2</sub> + 2.V1.V2.cosθ]<sup>1/2</sup> |
| D. | [V1<sub>2</sub> + V2<sub>2</sub> + 2.V1.V2.sinθ]<sup>1/2</sup> |
| Answer» D. [V1<sub>2</sub> + V2<sub>2</sub> + 2.V1.V2.sin‚âà√≠‚Äö√†√®]<sup>1/2</sup> | |
| 12. |
In the series-inverter control method |
| A. | two inverters are connected back-to-back |
| B. | the output from the inverter is taken serially |
| C. | output voltages of two inverters are summed up with the help of a transformer |
| D. | output voltages of two inverters are summed up with the help of a third inverter |
| Answer» D. output voltages of two inverters are summed up with the help of a third inverter | |
| 13. |
The series-inverter control method is a/an |
| A. | internal voltage control method |
| B. | external frequency control method |
| C. | external voltage control method |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 14. |
The external control of ac output voltage can be achieved in an inverter by |
| A. | connecting a cyclo-converter |
| B. | connecting an ac voltage controller between the output of the inverter and the load |
| C. | connecting an ac voltage controller between the dc source and inverter |
| D. | connecting an ac voltage controller between the load and the dc source |
| Answer» C. connecting an ac voltage controller between the dc source and inverter | |