MCQOPTIONS
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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. |
Electric motors are placed in __________ to protect them from dust and contamination. |
| A. | Enclosures |
| B. | Open environment |
| C. | Moisturizing environment |
| D. | Hot environment |
| Answer» B. Open environment | |
| 2. |
Second lowest order harmonic present in 3-Φ fully controlled rectifier is __________ |
| A. | 5th |
| B. | 7th |
| C. | 3rd |
| D. | 2nd |
| Answer» C. 3rd | |
| 3. |
Calculate the compensator rating required for a sec(Φ)=1. |
| A. | 0.64 P.U |
| B. | 0.21 P.U |
| C. | 0.57 P.U |
| D. | 0 P.U |
| Answer» E. | |
| 4. |
Full form of THD is ____________ |
| A. | Total harmonic diverter |
| B. | Total harmonic digital |
| C. | Total harmonic distortion |
| D. | Total harmonic discrete |
| Answer» D. Total harmonic discrete | |
| 5. |
The most common cause of motor failure is ____________ |
| A. | Overloading |
| B. | Low resistance |
| C. | Contamination |
| D. | Over-Heating |
| Answer» C. Contamination | |
| 6. |
Full form of IDMT is _________ |
| A. | Inverse definite minimum time |
| B. | Inverter definite minimum time |
| C. | Inverter definite maximum time |
| D. | Insert definite minimum time |
| Answer» B. Inverter definite minimum time | |
| 7. |
Overloading can be prevented using _____________ |
| A. | Over-current protection |
| B. | Speed protection |
| C. | Over frequency protection |
| D. | Oversize protection |
| Answer» B. Speed protection | |
| 8. |
1 Btu/h is equal to ___________ |
| A. | 0.641 |
| B. | .334 |
| C. | .293 |
| D. | .417 |
| Answer» D. .417 | |
| 9. |
Calculate the heat loss in the electric motor for time interval 0-5 sec using the following data: Ia=2 A, Ra=.8Ω. |
| A. | 16 J-sec |
| B. | 14 J-sec |
| C. | 12 J-sec |
| D. | 10 J-sec |
| Answer» B. 14 J-sec | |