MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Electric Drives knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Calculate the value of the fundamental displacement factor for 1-Φ Full wave semi-converter if the firing angle value is 20°. |
| A. | 0.82 |
| B. | .98 |
| C. | .74 |
| D. | .26 |
| Answer» C. .74 | |
| 2. |
Calculate the value of the fundamental displacement factor for 1-Φ Full wave bridge rectifier if the firing angle value is 60°. |
| A. | 0.5 |
| B. | .4 |
| C. | .2 |
| D. | .8 |
| Answer» B. .4 | |
| 3. |
Calculate the value of the Input power factor for 1-Φ Full wave bridge rectifier if the firing angle value is 45°. |
| A. | 0.65 |
| B. | .64 |
| C. | .61 |
| D. | .63 |
| Answer» E. | |
| 4. |
Calculate the value of THD value for 1-Φ Full wave bridge rectifier. |
| A. | 48.43 % |
| B. | 47.25 % |
| C. | 49.26 % |
| D. | 50.48 % |
| Answer» B. 47.25 % | |
| 5. |
Calculate the r.m.s value of the current through the thyristor in case of 1-Φ Full wave bridge rectifier if the value of the load current is 2 A. |
| A. | 1.414 A |
| B. | 1.214 A |
| C. | 1.347 A |
| D. | 1.657 A |
| Answer» B. 1.214 A | |
| 6. |
Calculate the average value of the current through the thyristor in case of 1-Φ Full wave bridge rectifier if the value of the load current is 42 A. |
| A. | 21 A |
| B. | 12 A |
| C. | 14 A |
| D. | 16 A |
| Answer» B. 12 A | |
| 7. |
Calculate the PIV for the Mid-point configuration of Full-wave rectifier if the peak value of the supply voltage is 311. |
| A. | 622 V |
| B. | 620 V |
| C. | 624 V |
| D. | 626 V |
| Answer» B. 620 V | |
| 8. |
Calculate the displacement factor if the fundamental voltage is 24sin(140πt-240°) and fundamental current is 47sin(140πt-120°). |
| A. | -0.5 |
| B. | -0.7 |
| C. | 0.9 |
| D. | 0.4 |
| Answer» B. -0.7 | |
| 9. |
In single phase RLE load, calculate the voltage across the thyristor when current decays to zero using the data: (Vs)r.m.s=220 V, f=40 Hz, R=1 Ω, E=90 V, β=230°. |
| A. | -328.33 V |
| B. | -325.48 V |
| C. | -254.85 V |
| D. | -284.48 V |
| Answer» B. -325.48 V | |
| 10. |
RLE load is also known as DC motor load. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
Calculate the conduction angle in purely inductive load if the firing angle is π÷2. |
| A. | 205° |
| B. | 175° |
| C. | 180° |
| D. | 195° |
| Answer» D. 195° | |
| 12. |
Calculate the extinction angle in purely inductive load if the firing angle is π÷4. |
| A. | 315° |
| B. | 145° |
| C. | 345° |
| D. | 285° |
| Answer» B. 145° | |
| 13. |
In Half-wave controlled rectifier calculate the average value of the voltage if the supply is 10sin(50t) and firing angle is 30°. |
| A. | 2.32 V |
| B. | 2.97 V |
| C. | 4.26 V |
| D. | 5.64 V |
| Answer» C. 4.26 V | |
| 14. |
In Half-wave uncontrolled rectifier calculate the average value of the voltage if the supply is 23sin(50t). |
| A. | 7.32 V |
| B. | 8.32 V |
| C. | 9.32 V |
| D. | 7.60 V |
| Answer» B. 8.32 V | |
| 15. |
RLE load is a voltage stiff load. |
| A. | True |
| B. | False |
| Answer» C. | |