MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering (MCQ) questions and answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In metallography, microscopic method provides information about_____ |
| A. | impurities in a metal |
| B. | location and extent of segregation |
| C. | uniformity of structure |
| D. | all of the above |
| Answer» B. location and extent of segregation | |
| 2. |
What is the crystal structure of -ferrite? |
| A. | Body centered cubic structure |
| B. | Face centered cubic structure |
| C. | Orthorhomic crystal structure |
| D. | None of the above |
| Answer» B. Face centered cubic structure | |
| 3. |
Austenite phase in Iron-Carbon equilibrium diagram_______ |
| A. | is face centered cubic structure |
| B. | has magnetic phase |
| C. | exists below 727 |
| D. | all of the above |
| Answer» B. has magnetic phase | |
| 4. |
The mixture of -ferrite and cementite is called as _______ |
| A. | Ledeburite |
| B. | Pearlite |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» C. Both a. and b. | |
| 5. |
Which of the following statements is/are true about Iron in Iron-Carbon equilibrium diagram ?1. It is soft and ductile 2. It is allotropic in nature 3. It is magnetic above curie temperature 4. Below the temperature of 1539 C, iron is in liquid state |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 3 and 4 |
| D. | All of the above |
| Answer» B. 2 and 3 | |
| 6. |
In which of the following methods, surface of a steel component becomes hard due to phase transformationaustenite to martensite? |
| A. | Carbonitriding |
| B. | Flame hardening |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» C. Both a. and b. | |
| 7. |
Which element precipitates at the grain boundaries, when austenitic stainless steel is heated at 900 C? |
| A. | Aluminium carbide |
| B. | Chromium carbide |
| C. | Magnesium carbide |
| D. | Molybdenum carbide |
| Answer» C. Magnesium carbide | |
| 8. |
In precipitation hardening, at 540 C when phase (CuAl) completely dissolves at grain boundaries the single phase is obtained known as ____ |
| A. | saturated solid solution |
| B. | homogeneous solid solution |
| C. | heterogeneous solid solution |
| D. | supersaturated solid solution |
| Answer» C. heterogeneous solid solution | |
| 9. |
Which of the following is brass? |
| A. | Admiralty brass |
| B. | Brazing brass |
| C. | Cartridge brass |
| D. | All of the above |
| Answer» C. Cartridge brass | |
| 10. |
What is the effect of silicon on the structure of cast iron? 1. Blowholes are present in the castings2. Increases fluidity 3. Influences the solidification of liquid alloys4. Reacts with iron to form iron sulphide |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 3 and 4 |
| D. | All of the above |
| Answer» C. 3 and 4 | |
| 11. |
A bearing material should not possess the characteristic of high______. |
| A. | coefficient of friction |
| B. | hardness |
| C. | melting point |
| D. | thermal conductivity |
| Answer» B. hardness | |
| 12. |
Which of the following cold working operations are suitable for brass? |
| A. | Cold rolling |
| B. | Deep drawing |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» D. None of the above | |
| 13. |
The solubility of tin in copper above 580C _______ |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | none of the above |
| Answer» B. increases | |