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 output voltage of the Buck-Boost converter if the supply voltage is 14 V and duty cycle value is .85. |
| A. | 79.3 V |
| B. | 45.5 V |
| C. | 86.5 V |
| D. | 54.7 V |
| Answer» B. 45.5 V | |
| 2. |
Calculate the average inductor current of the Boost converter if the load current is 7 A and duty cycle value is .8. |
| A. | 36 A |
| B. | 35 A |
| C. | 34 A |
| D. | 31 A |
| Answer» C. 34 A | |
| 3. |
Calculate the compensator rating required for cos(Φ)=.1. |
| A. | 0.91 P.U |
| B. | 0.99 P.U |
| C. | 0.97 P.U |
| D. | 0.92 P.U |
| Answer» C. 0.97 P.U | |
| 4. |
Calculate the output power of the Buck converter if the supply voltage is 4 V and duty cycle value is .1 for 4 Ω load. |
| A. | 40 mW |
| B. | 20 mW |
| C. | 50 mW |
| D. | 60 mW |
| Answer» B. 20 mW | |
| 5. |
In the biomedical instruments like artificial heart pumps, the motor used is ____________ |
| A. | DC shunt motor |
| B. | DC series motor |
| C. | Induction motor |
| D. | BLDC motor |
| Answer» E. | |
| 6. |
Calculate the value of Crest factor if Vpeak=141 V and Vr.m.s=100 V for sinusoidal voltage. |
| A. | 1.41 |
| B. | 2.38 |
| C. | 4.42 |
| D. | 5.58 |
| Answer» B. 2.38 | |
| 7. |
Calculate peak-peak voltage if Vmax=45 V and Vmin=45 V. |
| A. | 60 V |
| B. | 30 V |
| C. | 50 V |
| D. | 0 V |
| Answer» E. | |
| 8. |
Which of the following are the types of BLDC motor? |
| A. | Unipolar, Bipolar |
| B. | Unipolar, PWM |
| C. | Bipolar, PWM |
| D. | Synchronous, Induction |
| Answer» B. Unipolar, PWM | |
| 9. |
Calculate the electrical angle for 6 pole machine. (θm represents mechanical angle) |
| A. | 4×θm |
| B. | 5×θm |
| C. | 2×θm |
| D. | 3×θm |
| E. | 4×θmb) 5×θmc) 2×θmd) 3×θm |
| Answer» E. 4×θmb) 5×θmc) 2×θmd) 3×θm | |
| 10. |
Due to low inertia, BLDC motors have __________ |
| A. | Faster acceleration |
| B. | Slower acceleration |
| C. | High-cost |
| D. | Low cost |
| Answer» B. Slower acceleration | |
| 11. |
Which are the advantages of BLDC motor?I. Low costII. SimplicityIII. ReliabilityIV. Good performance |
| A. | I, II, III, IV |
| B. | I, II |
| C. | I, II, IV |
| D. | II, III, IV |
| Answer» B. I, II | |
| 12. |
The speed of a BLDC motor can be controlled by __________ |
| A. | Changing input DC voltage |
| B. | Changing temperature |
| C. | Changing wind direction |
| D. | Cannot be controlled |
| Answer» B. Changing temperature | |
| 13. |
BLDC motor is analogous to ______________ |
| A. | Permanent magnet synchronous motor |
| B. | DC motor |
| C. | Rotating Transformer |
| D. | Single-phase Induction motor |
| Answer» B. DC motor | |
| 14. |
In BLDC motor armature windings are placed on the stator side. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 15. |
The Hall effect sensor is used as the rotor position sensor for the BLDC motor. |
| A. | True |
| B. | False |
| Answer» B. False | |