MCQOPTIONS
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MCQOPTIONS
This section includes 10 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. |
A single-phase bridge inverter, fed from a 230 V dc is connected to the load R = 10 Ω and L = 0.03 H. The output is a quasi-square wave with an on period of 0.5 of a cycle. Determine the fundamental component of rms output voltage. |
| A. | 207.10 V |
| B. | 146.42 V |
| C. | 265.4 V |
| D. | 129 V |
| Answer» C. 265.4 V | |
| 2. |
A single-phase bridge inverter, fed from a 230 V dc is connected to the load R = 10 Ω and L = 0.03 H. Determine the fundamental component of rms output current. Fundamental output frequency of the square wave output = 50 Hz. |
| A. | 30 A |
| B. | 15 A |
| C. | 2.3 A |
| D. | 20.7 A |
| Answer» C. 2.3 A | |
| 3. |
Output voltage of a single-phase bridge inverter, fed from a fixed dc source is varied by |
| A. | varying the switching frequency |
| B. | pulse-width modulation |
| C. | pulse amplitude modulation |
| D. | all of the mentioned |
| Answer» C. pulse amplitude modulation | |
| 4. |
Control of frequency and control of voltage in 3-phase inverters is |
| A. | possible only through inverter control circuit |
| B. | possible through the control circuit of inverter and converter |
| C. | possible through inverter control of frequency and through converter control for voltage |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 5. |
Find, the maximum rms value of the fundamental component of the output voltage for the below given single pulse width modulated circuit. Take Vs = 68 V. |
| A. | 86.6 sin(d) |
| B. | 64 sin(d) |
| C. | 244 sin(d) |
| D. | 64 sin(d)c) 244 sin(d)d) none of the mentioned |
| Answer» B. 64 sin(d) | |
| 6. |
A single-phase bridge inverter has a square wave output voltage waveform, with odd harmonics present. What is the percentage of the fifth harmonic component to the fundamental component? |
| A. | 50 % |
| B. | 25 % |
| C. | 20 % |
| D. | 5 % |
| Answer» D. 5 % | |
| 7. |
A VSI will have a better performance if its |
| A. | load inductance is small and source inductance is large |
| B. | both load inductance and source inductance are small |
| C. | both load inductance and source inductance are large |
| D. | none of the mentioned |
| Answer» C. both load inductance and source inductance are large | |
| 8. |
In an inverter, if the fundamental output frequency is 45 Hz, then the frequency of the lowest order harmonic will be |
| A. | 45 Hz |
| B. | 225 Hz |
| C. | 15 Hz |
| D. | 135 Hz |
| Answer» E. | |
| 9. |
In an inverter, if the fundamental output frequency is 45 Hz, then the frequency of the second lowest order harmonic will be |
| A. | 45 Hz |
| B. | 135 Hz |
| C. | 225 Hz |
| D. | 9 Hz |
| Answer» D. 9 Hz | |
| 10. |
In case of multiple pulse width modulation method, if the amplitudes of the reference wave and the carrier wave are made equal then, the pulse width = |
| A. | ∞ |
| B. | 0 |
| C. | 100 ° |
| D. | none of the mentioned |
| Answer» C. 100 ° | |