MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
______________ bricks are used in the burning zone of a cement rotary kiln ? |
| A. | High alumina |
| B. | Fireclay |
| C. | Thoria |
| D. | Silicon carbide |
| Answer» B. Fireclay | |
| 2. |
Bottom of basic open hearth furnace are constructed of__________________? |
| A. | Dead burnt magnesite ramming mass |
| B. | Porous fireclay bricks |
| C. | Semi-silica bricks |
| D. | Silicon carbide bricks |
| Answer» B. Porous fireclay bricks | |
| 3. |
Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except ? |
| A. | Cost |
| B. | Electrical conductivity |
| C. | Thermal conductivity |
| D. | Fusion point |
| Answer» B. Electrical conductivity | |
| 4. |
Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns ? |
| A. | 1800 |
| B. | 2200 |
| C. | 2400 |
| D. | 2700 |
| Answer» E. | |
| 5. |
Bauxite calcining rotary kilns are lined with ________________ bricks? |
| A. | Fireclay |
| B. | Carbon |
| C. | 85% alumina |
| D. | Corundum |
| Answer» D. Corundum | |
| 6. |
Basic bricks are not made of ___________________? |
| A. | Fireclay |
| B. | Magnesite |
| C. | Forsterite |
| D. | Chromite |
| Answer» B. Magnesite | |
| 7. |
An indication of degree of firing in silica brick is its____________________? |
| A. | Specific gravity |
| B. | Fusion point |
| C. | RUL |
| D. | None of these |
| Answer» B. Fusion point | |
| 8. |
An ideal refractory should have high__________________? |
| A. | Spalling rate |
| B. | Fusion point |
| C. | Shrinkage ability |
| D. | None of these |
| Answer» C. Shrinkage ability | |
| 9. |
Alumina-graphite bricks are used for lining the ____________________? |
| A. | Slide gate in teeming laddies |
| B. | Continuous casting systems |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 10. |
Addition of zircon to silica refractory brick improves its_____________________? |
| A. | Crushing strength |
| B. | Resistance to slag attack |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» C. Both A. and B. | |
| 11. |
Addition of grog in fireclay brick during its manufacture is advantageous, because it results in_____________________? |
| A. | Less shrinkage in heating, decreased apparent porosity & increased specific gravity |
| B. | High strength & thermal spalling resistance |
| C. | Less addition of water to get a workable plasticity & lesser time required for drying the raw refractories and hence increased rate of production |
| D. | All A., B. and C. |
| Answer» E. | |
| 12. |
A steel member used in the furnace construction to take the thrust of the brickwork is called___________________? |
| A. | Buckstay |
| B. | Breast wall |
| C. | Armouring |
| D. | Baffle |
| Answer» B. Breast wall | |
| 13. |
10 to 30% magnesite is added to Chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the _____________ of Chromite? |
| A. | Spalling resistance |
| B. | Refractoriness |
| C. | Crushing strength |
| D. | Resistance to slag |
| Answer» B. Refractoriness | |