MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Estimation And Costing knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In case of small power installations, the number of GI of copper plates required for earthing is: |
| A. | 2 |
| B. | 3 |
| C. | 1 |
| D. | 4 |
| Answer» D. 4 | |
| 2. |
According to CPWD guidelines on electrical work of 2013, the plate-type copper earth electrode should be sized. |
| A. | 90 cm × 90 cm × 3 mm |
| B. | 60 cm × 60 cm × 6 mm |
| C. | 60 cm × 60 cm × 3 mm |
| D. | 90 cm × 90 cm × 6 mm |
| Answer» D. 90 cm × 90 cm × 6 mm | |
| 3. |
In earthed neutral system, the magnitude of transient voltage is: |
| A. | Zero |
| B. | Vary small |
| C. | Medium |
| D. | Very high |
| Answer» C. Medium | |
| 4. |
In practice, Earth is chosen as a place of zero electric potential because it: |
| A. | Is non-conducting |
| B. | Is easily available reference |
| C. | Keeps losing and gaining electric charge every day |
| D. | Has almost constant potential |
| Answer» E. | |
| 5. |
It is decided that the copper rod earthing is to be installed, then the size of the rod required for earthing is: |
| A. | 12.5 mm |
| B. | 19 mm |
| C. | 12.5 cm |
| D. | 19 cm |
| Answer» B. 19 mm | |
| 6. |
For a rod type earth electrode made of steel, the diameter value should not be less than? |
| A. | 6 mm |
| B. | 12 mm |
| C. | 4 mm |
| D. | 16 mm |
| Answer» E. | |
| 7. |
Earth resistance does not depend on ______. |
| A. | Operating time |
| B. | Depth of Earth Electrode |
| C. | Moisture |
| D. | Temperature |
| Answer» B. Depth of Earth Electrode | |
| 8. |
For improving earthing resistance, if an additional earthing is required, so that, it should be connected with existing earthing in: |
| A. | Series |
| B. | Parallel |
| C. | Either series or parallel |
| D. | None of these |
| Answer» C. Either series or parallel | |