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. |
Volt-sec balance method is based on the principle of the energy of conservation. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
Calculate the pulse number if the supply frequency is 2π and the output frequency is π÷6. |
| A. | 4 |
| B. | 12 |
| C. | 16 |
| D. | 8 |
| Answer» C. 16 | |
| 3. |
Calculate the output frequency for the six-pulse converter if the supply frequency is 10 Hz. |
| A. | 40 Hz |
| B. | 30 Hz |
| C. | 60 Hz |
| D. | 80 Hz |
| Answer» D. 80 Hz | |
| 4. |
Calculate the string efficiency if the de-rating factor is .429. |
| A. | 48.1 % |
| B. | 57.1 % |
| C. | 47.8 % |
| D. | 46.5 % |
| Answer» C. 47.8 % | |
| 5. |
Calculate the circuit turn-off time for Half-wave controlled rectifier for a ω=5 rad/sec for resistive load. |
| A. | .62 sec |
| B. | .42 sec |
| C. | .58 sec |
| D. | .64 sec |
| Answer» B. .42 sec | |
| 6. |
In Half-wave controlled rectifier calculate the average value of the current for 2.5 Ω resistive load if the supply is sin(5.2t) and firing angle is 26°. |
| A. | 0.8 V |
| B. | 0.15 V |
| C. | 0.12 V |
| D. | 0.21 V |
| Answer» D. 0.21 V | |
| 7. |
In Half-wave uncontrolled rectifier calculate the average value of the current for 3 Ω resistive load if the supply is 34sin(11t). |
| A. | 3.6 A |
| B. | 2.6 A |
| C. | 2.5 A |
| D. | 3.1 A |
| Answer» B. 2.6 A | |
| 8. |
The conduction period of diode in Half-wave uncontrolled rectifier for resistive load is ______________ |
| A. | π |
| B. | 2π |
| C. | 3π |
| D. | 4π |
| Answer» B. 2π | |
| 9. |
In Half-wave uncontrolled rectifier calculate the power dissipation across the 8 Ω resistor if the supply is 29sin(22t). |
| A. | 26.2 W |
| B. | 24.2 W |
| C. | 26.1 W |
| D. | 29.1 W |
| Answer» B. 24.2 W | |
| 10. |
In Half-wave uncontrolled rectifier calculate the r.m.s value of the voltage if the supply is 89sin(41t). |
| A. | 91.5 V |
| B. | 44.5 V |
| C. | 25.1 V |
| D. | 15.1 V |
| Answer» C. 25.1 V | |
| 11. |
In Half-wave uncontrolled rectifier calculate the average value of the voltage if the supply is 3sin(5t). |
| A. | .95 V |
| B. | .92 V |
| C. | .93 V |
| D. | .94 V |
| Answer» B. .92 V | |
| 12. |
R-L-C underdamped loads are generally lagging power factor loads. |
| A. | True |
| B. | False |
| Answer» C. | |
| 13. |
Calculate the conduction angle in purely inductive load if the firing angle is 165°. |
| A. | 78° |
| B. | 55° |
| C. | 30° |
| D. | 19° |
| Answer» D. 19° | |
| 14. |
Calculate the extinction angle in purely inductive load if the firing angle is 13°. |
| A. | 328° |
| B. | 347° |
| C. | 349° |
| D. | 315° |
| Answer» C. 349° | |
| 15. |
In Half-wave controlled rectifier calculate the average value of the voltage if the supply is 13sin(25t) and firing angle is 13°. |
| A. | 4.08 V |
| B. | 4.15 V |
| C. | 3.46 V |
| D. | 5.48 V |
| Answer» B. 4.15 V | |