MCQOPTIONS
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MCQOPTIONS
This section includes 14 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 3- power developed in the IM connected in star using the following data: Vp=7 V, IL=7 A, cos =.6. |
| A. | 88.5 W |
| B. | 88.4 W |
| C. | 88.8 W |
| D. | 88.2 W |
| Answer» E. | |
| 2. |
Choose the correct relationship in Star connection with the positive sequence. |
| A. | V<sub>L</sub>=V<sub>p</sub> |
| B. | V<sub>L</sub>= 3V<sub>p</sub> |
| C. | V<sub>L</sub>= 2V<sub>p</sub> |
| D. | I<sub>L</sub>= 3I<sub>p</sub> |
| Answer» C. V<sub>L</sub>= 2V<sub>p</sub> | |
| 3. |
Choose the correct relationship in delta connection with the positive sequence. |
| A. | I<sub>L</sub>=I<sub>p</sub> |
| B. | V<sub>L</sub>= 3V<sub>p</sub> |
| C. | V<sub>L</sub>=V<sub>p</sub> |
| D. | I<sub>L</sub>= 3I<sub>p</sub> |
| Answer» E. | |
| 4. |
What is the relationship between line and phase current in Star connection with the positive sequence? |
| A. | V<sub>L</sub>=V<sub>p</sub> |
| B. | V<sub>L</sub>= 9V<sub>p</sub> |
| C. | V<sub>L</sub>= 2V<sub>p</sub> |
| D. | I<sub>L</sub>=I<sub>p</sub> |
| Answer» E. | |
| 5. |
What is the correct relationship between the phase voltage and line voltage in Delta connection with the positive sequence? |
| A. | V<sub>L</sub>=V<sub>p</sub> |
| B. | V<sub>L</sub>= 3V<sub>p</sub> |
| C. | V<sub>L</sub>= 2V<sub>p</sub> |
| D. | I<sub>L</sub>= 2I<sub>p</sub> |
| Answer» B. V<sub>L</sub>= 3V<sub>p</sub> | |
| 6. |
Full form of PWM. |
| A. | Pulse width modulation |
| B. | Pulse run modulation |
| C. | Power width modulation |
| D. | Pulse wisdom mode |
| Answer» B. Pulse run modulation | |
| 7. |
Calculate the average power dissipated if the value of the duty cycle is .5 and Pmax=12 W. |
| A. | 6 W |
| B. | 5 W |
| C. | 4 W |
| D. | 3 W |
| Answer» B. 5 W | |
| 8. |
Calculate mark to space ratio if the system is on for 20 sec and off for 3 sec. |
| A. | 6.66 |
| B. | 4.48 |
| C. | 8.2 |
| D. | 5.6 |
| Answer» B. 4.48 | |
| 9. |
The unit of the moment of inertia is Joule. |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
Calculate the 3- power developed in the IM using the following data: VL=20 V, IL=5 A, cos =.8. |
| A. | 138.56 W |
| B. | 128.41 W |
| C. | 163.78 W |
| D. | 177.59 W |
| Answer» B. 128.41 W | |
| 11. |
450-seconds rated motor is preferable for __________ |
| A. | Light duty cranes |
| B. | Medium duty cranes |
| C. | Intermittent duty cranes |
| D. | Heavy duty cranes |
| Answer» B. Medium duty cranes | |
| 12. |
Voltage rating of the IM depends upon the insulation level. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 13. |
Current rating of the IM depends upon the cross-section area of the conductors. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 14. |
Which one of the following motor is a 1- AC motor? |
| A. | Synchronous motor |
| B. | Series motor |
| C. | Shunt motor |
| D. | Capacitor run |
| Answer» E. | |