MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Casting knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The effect of temperature change is generally neglected during the vacuum degassing process. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
In vacuum degassing method, low viscosity is considered to have negative influence on the reaction rate. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
In vacuum treatment of molten metal, temperature of the melt can be decreased. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
IN_VACUUM_DEGASSING_METHOD,_LOW_VISCOSITY_IS_CONSIDERED_TO_HAVE_NEGATIVE_INFLUENCE_ON_THE_REACTION_RATE.?$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
The_effect_of_temperature_change_is_generally_neglected_during_the_vacuum_degassing_process.$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
In vacuum treatment of molten metal, temperature of the melt can be decreased? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
The effectiveness of vacuum treatment is reduced by the increase in surface area of the molten metal exposed to vacuum. |
| A. | True |
| B. | False |
| Answer» C. | |
| 8. |
Which of the following formulas is used for determining the circulation rate (R) in recirculation degassing? |
| A. | R = 1.42*10<sup>3</sup>*Q<sup>1/3</sup>*d<sup>1/3</sup>*{ln(P1/P2)} |
| B. | R = 2.42*10<sup>3</sup>*Q<sup>1/3</sup>*d<sup>1/3</sup>*{ln(P1/P2)} |
| C. | R = 5.14*10<sup>3</sup>*Q<sup>1/3</sup>*d<sup>1/3</sup>*{ln(P1/P2)} |
| D. | R = 7.42*10<sup>3</sup>*Q<sup>1/3</sup>*d<sup>1/3</sup>*{ln(P1/P2)} |
| Answer» E. | |
| 9. |
Which of the following gases is used in the method of recirculation degassing? |
| A. | Hydrogen |
| B. | Nitrogen |
| C. | Argon |
| D. | Oxygen |
| Answer» D. Oxygen | |
| 10. |
Degassing can be carried out by placing ladle containing liquid metal under vacuum. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
The presence of hydrogen in molten casting strengthens the casting components. |
| A. | True |
| B. | False |
| Answer» C. | |
| 12. |
Excess of nitrogen in molten casting can cause embrittlement of casting components. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 13. |
The term degassing is basically employed for optimizing the use of materials used in production of casting components. |
| A. | True |
| B. | False |
| Answer» C. | |