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. |
Which of the following reasons is the incorrect reason for the blow holes inside the castings? |
| A. | Presence of moisture in the mould |
| B. | Lower venting |
| C. | Lower permeability of the mould |
| D. | High pressure of the molten metal |
| Answer» E. | |
| 2. |
Which of the following can be the reason for the aspiration effect? |
| A. | High pressure of molten metal |
| B. | High pouring temperature of molten metal |
| C. | Low viscosity of molten metal |
| D. | High viscosity of molten metal |
| Answer» C. Low viscosity of molten metal | |
| 3. |
In the given below figure of outlet dimensions to prevent vacuum generation, what should be the relation between d’ and d? |
| A. | d’/d = 1.3 |
| B. | d’/d > 2 |
| C. | d’/d = 2 |
| D. | d’/d > 2.2 |
| Answer» B. d’/d > 2 | |
| 4. |
In the given below figure of Mechanism of vacuum generation, point ‘2’ is the indication of _____ |
| A. | Poynting point |
| B. | Vena contracta |
| C. | Stack point |
| D. | Steric point |
| Answer» C. Stack point | |
| 5. |
WHICH_OF_THE_FOLLOWING_CAN_BE_THE_REASON_FOR_ASPIRATION_EFFECT??$ |
| A. | High pressure of molten metal |
| B. | High pouring temperature of molten metal |
| C. | Low viscosity of molten metal |
| D. | High viscosity of molten metal |
| Answer» C. Low viscosity of molten metal | |
| 6. |
Which of the following reasons is the incorrect reason for the blow holes inside the castings?$ |
| A. | Presence of moisture in the mould |
| B. | Lower venting |
| C. | Lower permeability of the mould |
| D. | High pressure of the molten metal |
| Answer» E. | |
| 7. |
Which of the following gases is responsible for the Pin hole porosity in the molten metal? |
| A. | Hydrogen |
| B. | Nitrogen |
| C. | Oxygen |
| D. | Carbon-dioxide |
| Answer» B. Nitrogen | |
| 8. |
What is the purpose of strainer in the gating system? |
| A. | To make uniform flow |
| B. | To make smooth surface finish of the casting |
| C. | To remove dross from the molten metal |
| D. | To create the positive pressure throughout to avoid aspiration effect |
| Answer» D. To create the positive pressure throughout to avoid aspiration effect | |
| 9. |
The primary purpose of sprue in casting mould is to _____ |
| A. | act as a reservoir for molten metal |
| B. | feed the casting at rate consistent with the rate of solidification |
| C. | feed molten metal from the pouring basin to the gate |
| D. | help feed the casting until all solidification takes place |
| Answer» D. help feed the casting until all solidification takes place | |
| 10. |
Splash core is used _____ |
| A. | to reduce the eroding force of the liquid metal |
| B. | to make the flow smooth and slow |
| C. | to remove dross from the molten metal |
| D. | to prevent heavier impurities from entering the mould |
| Answer» B. to make the flow smooth and slow | |
| 11. |
Sprue design is made tapered instead of straight ___________ |
| A. | To easy flow of molten metal |
| B. | To have smoothness in the metal flow |
| C. | To maintain the pressure balance |
| D. | To avoid the erosion of mould sand |
| Answer» D. To avoid the erosion of mould sand | |
| 12. |
Which of the following effects can produce porous castings? |
| A. | Aspiration effect |
| B. | Viscous effect |
| C. | Shapiro effect |
| D. | Turbulent effect |
| Answer» B. Viscous effect | |
| 13. |
Which of the following items is used for trapping impurities from entering the mould? |
| A. | Facing sand |
| B. | Core |
| C. | Skim bob |
| D. | Pouring basin |
| Answer» D. Pouring basin | |