MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 9 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 duty cycle if the system is on for 5 sec and off for 10 sec. |
| A. | .333 |
| B. | .444 |
| C. | .201 |
| D. | .642 |
| Answer» B. .444 | |
| 2. |
The slope of the V-I curve is 0 . Calculate the value of resistance. The graph is parallel to the x-axis. |
| A. | 1 |
| B. | 1.8 |
| C. | 0 |
| D. | 2.2 |
| Answer» D. 2.2 | |
| 3. |
Calculate the value of the frequency of the DC supply. |
| A. | 0 Hz |
| B. | 50 Hz |
| C. | 20 Hz |
| D. | 10 Hz |
| Answer» B. 50 Hz | |
| 4. |
What is the unit of the apparent or complex power? |
| A. | VAR |
| B. | VA |
| C. | ohm |
| D. | Volt |
| Answer» C. ohm | |
| 5. |
Calculate the reactive power in a 5 resistor. |
| A. | 7 VAR |
| B. | 0 VAR |
| C. | 2 VAR |
| D. | 1 VAR |
| Answer» C. 2 VAR | |
| 6. |
Calculate the power factor during the resonance condition. |
| A. | .58 |
| B. | .42 |
| C. | .65 |
| D. | 1 |
| Answer» E. | |
| 7. |
The unit of reactive power is VAR. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
Salient pole machines are more stable than cylindrical rotor machines. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
What is the formula for the active power in the cylindrical rotor synchronous machine? (Eb represents armature emf, Vt represents terminal voltage, represents rotor angle, X represents reactance) |
| A. | E<sub>b</sub> V<sub>t</sub> sin X |
| B. | E<sub>b</sub> V<sub>t</sub><sup>2</sup> sin X |
| C. | E<sub>b</sub><sup>2</sup> V<sub>t</sub> sin X |
| D. | E<sub>b</sub> V<sub>t</sub> sin X2 |
| Answer» B. E<sub>b</sub> V<sub>t</sub><sup>2</sup> sin X | |