MCQOPTIONS
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MCQOPTIONS
This section includes 9 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. |
Find the output voltage for a step-up chopper when it is operated at a duty cycle of 50 % and Vs = 240 V. |
| A. | 240 V |
| B. | 480 V |
| C. | 560 V |
| D. | 120 V |
| Answer» C. 560 V | |
| 2. |
Find the expression for output voltage for a step-up chopper, assume linear variation of load current and α as the duty cycle. |
| A. | Vs |
| B. | Vs/α |
| C. | Vs/(1-α) |
| D. | Vs/√2 |
| Answer» D. Vs/√2 | |
| 3. |
What is the voltage across the load when the SW is first closed and then opened? |
| A. | Vs |
| B. | duty cycle x Vs |
| C. | Vs + L (di/dt) |
| D. | zero |
| Answer» D. zero | |
| 4. |
In the below given circuit, when switch (SW) is first switched closed and then opened the |
| A. | voltage is non-zero and current is rising |
| B. | voltage is zero and current is decaying |
| C. | voltage is non-zero and current is decaying |
| D. | voltage is zero and current is rising |
| Answer» D. voltage is zero and current is rising | |
| 5. |
If Vo is the output voltage and Vs is the input DC voltage, then for the below given circuit. |
| A. | Vo = Vs |
| B. | Vo < Vs |
| C. | Vo > Vs |
| D. | Insufficient information |
| Answer» D. Insufficient information | |
| 6. |
In a step down chopper, if Vs = 100 V and the chopper is operated at a duty cycle of 75 %. Find the output voltage. |
| A. | 100 V |
| B. | 75 V |
| C. | 25 V |
| D. | none of the mentioned |
| Answer» C. 25 V | |
| 7. |
In the below given circuit, when switch (SW) is off |
| A. | voltage is non-zero and current is rising |
| B. | voltage is non-zero and current is decaying |
| C. | voltage is zero and current is rising |
| D. | voltage is zero and current is decaying |
| Answer» E. | |
| 8. |
In the below given circuit, when switch (SW) is on |
| A. | voltage is non-zero and current is rising |
| B. | voltage is non-zero and current is decaying |
| C. | voltage is zero and current is rising |
| D. | voltage is zero and current is decaying |
| Answer» B. voltage is non-zero and current is decaying | |
| 9. |
The below given figure is that of a _________ (IGBT is used as a chopper switch) |
| A. | step-up/step-down chopper |
| B. | step-down chopper |
| C. | step-up chopper |
| D. | none of the mentioned |
| Answer» C. step-up chopper | |