MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Materials Metallurgy knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
An electrically insulating material has a resistivity that is ____ times greater than that of copper? |
| A. | 10<sup>18</sup> |
| B. | 10<sup>19</sup> |
| C. | 10<sup>20</sup> |
| D. | 10<sup>21</sup> |
| Answer» E. | |
| 2. |
Which of the following is a cause for an increase in insulation? |
| A. | Increase in thickness |
| B. | Decrease in thickness |
| C. | Decrease in cost |
| D. | Low density |
| Answer» B. Decrease in thickness | |
| 3. |
A cork insulation with a waterproof binder is used for _______ surfaces. |
| A. | Soft |
| B. | Hot |
| C. | Cold |
| D. | Hard |
| Answer» D. Hard | |
| 4. |
An insulating material made from ______ is preferred for applications where vibration resistance is vital. |
| A. | Asbestos |
| B. | Magnesium carbonate |
| C. | Rock wool |
| D. | Cattle hair |
| Answer» E. | |
| 5. |
An insulating material named 85% magnesia can be used up to temperatures of _______ |
| A. | 120<sup>o</sup>C |
| B. | 250<sup>o</sup>C |
| C. | 315<sup>o</sup>C |
| D. | 460<sup>o</sup>C |
| Answer» D. 460<sup>o</sup>C | |
| 6. |
Which of the following is an example of an organic insulating material? |
| A. | Wood-pulp |
| B. | Charcoal |
| C. | Slag |
| D. | Asbestos |
| Answer» B. Charcoal | |
| 7. |
How does moisture affect the thermal insulation of a body? |
| A. | Increases |
| B. | Decreases |
| C. | Unaltered |
| D. | Becomes zero |
| Answer» B. Decreases | |
| 8. |
Which of the following is a requirement for thermal insulation in materials? |
| A. | High specific gravity |
| B. | High specific heat |
| C. | Low thermal conductivity |
| D. | Non-inflammability |
| Answer» D. Non-inflammability | |