MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
When the 3-phase system is not grounded and if Single Line to Ground fault occurs, the voltage of the other two healthy phases will____________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unaffected |
| Answer» B. Decreases | |
| 2. |
When earth fault occurs______________? |
| A. | voltage potential at the earth mat increases due to grounding |
| B. | voltage potential at the earth mat decreases due to grounding |
| C. | voltage potential at the earth mat remains zero irrespective of fault |
| D. | none of the above |
| Answer» B. voltage potential at the earth mat decreases due to grounding | |
| 3. |
The size of the earth or ground wire is based on the______________? |
| A. | maximum fault current carrying through the ground wire |
| B. | rated current carrying capacity of the service line |
| C. | depends on the soil resistance |
| D. | both (A) and (C) |
| Answer» E. | |
| 4. |
The objective of earthing or grounding is_______________? |
| A. | to provide as low resistance possible to the ground |
| B. | to provide as high resistance possible to the ground |
| C. | to provide flow of positive, negative and zero sequence currents |
| D. | none of the above |
| Answer» B. to provide as high resistance possible to the ground | |
| 5. |
Moisture content in the soil __________ the earth soil resistance? |
| A. | increase |
| B. | decrease |
| C. | does not affect |
| D. | none of the above |
| Answer» C. does not affect | |
| 6. |
Ground resistance should be designed such that_____________? |
| A. | grounding resistance should be as low as possible |
| B. | grounding resistance should be as high as possible |
| C. | grounding resistance should be always zero |
| D. | none of the above |
| Answer» B. grounding resistance should be as high as possible | |
| 7. |
For an EHV equipment for maintenance first it should be isolated and connected to ground because_____________? |
| A. | to provide low impedance |
| B. | to discharge the charging capacitance to ground |
| C. | protection for operating personnel |
| D. | both (B) and (C) |
| Answer» E. | |
| 8. |
Factors on which soil resistance depends_______________? |
| A. | depth of the electrode |
| B. | moisture |
| C. | Nacl |
| D. | all the above |
| Answer» E. | |
| 9. |
Average resistance of human body is____________? |
| A. | 500 ohms |
| B. | 1000 ohms |
| C. | 1500 ohms |
| D. | 2000 ohms |
| Answer» C. 1500 ohms | |