MCQOPTIONS
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MCQOPTIONS
This section includes 8 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. |
For a step-down chopper, when the duty cycle is increased the average value of the output voltage |
| A. | increases |
| B. | decreases |
| C. | remains the same |
| D. | none of the mentioned |
| Answer» B. decreases | |
| 2. |
For a step-up chopper, when the duty cycle is increased the average value of the output voltage |
| A. | increases |
| B. | decreases |
| C. | remains the same |
| D. | none of the mentioned |
| Answer» B. decreases | |
| 3. |
A step-up chopper has input voltage of 220 V and output voltage of 660 V. If the conducting time of the IGBT based chopper is 100 s, compute Toff width of the output voltage pulse. |
| A. | 100 s |
| B. | 150 s |
| C. | 50 s |
| D. | Insufficient data |
| Answer» D. Insufficient data | |
| 4. |
Find the expression for effective input resistance of a step down chopper. With R load and duty cycle = . |
| A. | R x |
| B. | R/2 |
| C. | 0 |
| D. | R/ |
| Answer» E. | |
| 5. |
A step down chopper is operated at 240V at duty cycle of 75%. Find the value of RMS switch (IGBT/MOSFET) current. Take R = 10 . |
| A. | 2.07 A |
| B. | 200 mA |
| C. | 1.58 A |
| D. | 2.4 A |
| Answer» B. 200 mA | |
| 6. |
For a step-down chopper, find the rms value of output voltage. Let be the duty cycle and Vs be the input voltage. |
| A. | x Vs |
| B. | Vs/ |
| C. | x Vs |
| D. | Vs/2 |
| Answer» D. Vs/2 | |
| 7. |
If a step up chopper s switch is always kept open then (ideally) |
| A. | Vo = 0 |
| B. | Vo = |
| C. | Vo = Vs |
| D. | Vo > Vs |
| Answer» C. Vo = Vs | |
| 8. |
If a step up chopper s switch is always kept off then (ideally) |
| A. | Vo = 0 |
| B. | Vo = |
| C. | Vo = Vs |
| D. | Vo > Vs |
| Answer» D. Vo > Vs | |