MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Casting knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In light alloys, metal – mold reaction can be suppressed by adding Helium. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
What is differential freezing? |
| A. | Increase in oxygen concentration |
| B. | Increase in nitrogen concentration |
| C. | Increase in carbon concentration |
| D. | Increase in hydrogen concentration |
| Answer» E. | |
| 3. |
What is the chemical formula of silica? |
| A. | SiO |
| B. | SiO2 |
| C. | SiO3 |
| D. | SiO4 |
| Answer» C. SiO3 | |
| 4. |
WHAT_IS_DIFFERENTIAL_FREEZING??$ |
| A. | Increase in oxygen concentration |
| B. | Increase in nitrogen concentration |
| C. | Increase in carbon concentration |
| D. | Increase in hydrogen concentration |
| Answer» E. | |
| 5. |
In_light_alloys,_metal_–_mold_reaction_can_be_suppressed_by_adding_Helium.$# |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
How can the pinholes be reduced? |
| A. | Oxidizing |
| B. | Deoxidizing |
| C. | Adding ozone |
| D. | Adding calcium carbonate |
| Answer» C. Adding ozone | |
| 7. |
What is the condition for mold metal reaction to take place? |
| A. | Radiating contact between gas and metal |
| B. | Direct contact between gas and metal |
| C. | Radiating contact between gas and oxide film |
| D. | Direct contact between gas and oxide film |
| Answer» C. Radiating contact between gas and oxide film | |
| 8. |
Which metal in aluminium alloy reacts with water to give out hydrogen filled pinholes? |
| A. | Manganese |
| B. | Iron |
| C. | Magnesium |
| D. | Aluminium |
| Answer» D. Aluminium | |
| 9. |
What percent of magnesium is used in mold metal reactions? |
| A. | More than 1% |
| B. | More than 2% |
| C. | More than 3% |
| D. | More than 4% |
| Answer» B. More than 2% | |
| 10. |
Silica reacts with what to give out fayalite? |
| A. | Iron |
| B. | Iron Sulphate |
| C. | Iron Oxide |
| D. | Iron Carbide |
| Answer» D. Iron Carbide | |
| 11. |
What is the chemical formula of fayalite? |
| A. | FeO<sub>2</sub>SiO<sub>2</sub> |
| B. | FeOSiO<sub>2</sub> |
| C. | FeO<sub>3</sub>SiO<sub>2</sub> |
| D. | FeO<sub>2</sub>SiO<sub>3</sub> |
| Answer» C. FeO<sub>3</sub>SiO<sub>2</sub> | |
| 12. |
With what does iron react to give out Ferrous Oxide? |
| A. | Carbon dioxide |
| B. | Nitrogen |
| C. | Ozone |
| D. | Oxygen |
| Answer» E. | |