MCQOPTIONS
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MCQOPTIONS
This section includes 42 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Materials Metallurgy knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the effect of Nickel on cast irons? |
| A. | Stabilizes carbides |
| B. | Increases hardness |
| C. | Refines grain structure |
| D. | Improves corrosion resistance |
| Answer» D. Improves corrosion resistance | |
| 2. |
How are malleable cast irons designated for different grades? |
| A. | By tensile strength |
| B. | By six or seven-digit numbers |
| C. | By five-digit numbers |
| D. | By alphabets |
| Answer» D. By alphabets | |
| 3. |
Which of the following cast irons cannot be machined? |
| A. | White cast iron |
| B. | Grey cast iron |
| C. | Malleable cast iron |
| D. | Spheroidal graphite cast iron |
| Answer» B. Grey cast iron | |
| 4. |
Decomposition of cementite to form ferrite and graphite is known as _______ |
| A. | Decomposition of cast irons |
| B. | Production of cast irons |
| C. | Growth of cast irons |
| D. | Prevention of growth of cast irons |
| Answer» D. Prevention of growth of cast irons | |
| 5. |
What is the form graphite structure in ductile cast iron? |
| A. | Spheroidal |
| B. | Nodular |
| C. | Flakes |
| D. | Layers |
| Answer» C. Flakes | |
| 6. |
In malleable cast iron, the graphite turns into spheroidal particles. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
Which of the following can be carbon composition of cast iron? |
| A. | 1% |
| B. | 1.5% |
| C. | 0.5% |
| D. | 2.5% |
| Answer» E. | |
| 8. |
What is the temperature in a core box typically? |
| A. | 120°C – 160°C |
| B. | 180°C – 260°C |
| C. | 200°C – 270°C |
| D. | 290°C – 350°C |
| Answer» C. 200°C – 270°C | |
| 9. |
Which of the following materials cannot be used for making a core box? |
| A. | Aluminium |
| B. | Steel |
| C. | Zinc |
| D. | Cast iron |
| Answer» D. Cast iron | |
| 10. |
What is the tensile strength of thick gray cast iron? |
| A. | 71 MPa |
| B. | 83 MPa |
| C. | 95 MPa |
| D. | 107 MPa |
| Answer» C. 95 MPa | |
| 11. |
What would be the tensile strength of gray cast iron of class 20? |
| A. | 120 MPa |
| B. | 163 MPa |
| C. | 138 MPa |
| D. | 152 MPa |
| Answer» D. 152 MPa | |
| 12. |
Presence of which material in a gray cast iron causes reduced ductility? |
| A. | Graphite |
| B. | Aluminium |
| C. | Coke |
| D. | Zinc |
| Answer» B. Aluminium | |
| 13. |
WHICH_OF_THE_FOLLOWING_CAST_IRONS_CANNOT_BE_MACHINED??$ |
| A. | White cast iron |
| B. | Grey cast iron |
| C. | Malleable cast iron |
| D. | Spheroidal graphite cast iron |
| Answer» B. Grey cast iron | |
| 14. |
IN_MALLEABLE_CAST_IRON,_THE_GRAPHITE_TURNS_INTO_SPHEROIDAL_PARTICLES.?$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 15. |
WHICH_OF_THE_FOLLOWING_MATERIALS_CANNOT_BE_USED_FOR_MAKING_A_CORE_BOX??$ |
| A. | Aluminium |
| B. | Steel |
| C. | Zinc |
| D. | Cast iron |
| Answer» D. Cast iron | |
| 16. |
What is the effect of Nickel on cast irons?$ |
| A. | Stabilizes carbides |
| B. | Increases hardness |
| C. | Refines grain structure |
| D. | Improves corrosion resistance |
| Answer» D. Improves corrosion resistance | |
| 17. |
How are malleable cast irons designated for different grades?$ |
| A. | By tensile strength |
| B. | By six or seven-digit numbers |
| C. | By five-digit numbers |
| D. | By alphabets |
| Answer» D. By alphabets | |
| 18. |
What_is_the_form_graphite_structure_in_ductile_cast_iron?$ |
| A. | Spheroidal |
| B. | Nodular |
| C. | Flakes |
| D. | Layers |
| Answer» C. Flakes | |
| 19. |
What_is_the_temperature_in_a_core_box_typically?$ |
| A. | 120°C – 160°C |
| B. | 180°C – 260°C |
| C. | 200°C – 270°C |
| D. | 290°C – 350°C |
| Answer» C. 200¬¨¬®‚Äö√†√ªC ‚Äö√Ñ√∂‚àö√ë‚àö¬® 270¬¨¬®‚Äö√†√ªC | |
| 20. |
What is the defining property of Wrought Irons? |
| A. | High carbon |
| B. | Low carbon |
| C. | No carbon |
| D. | Completely carbon-filled |
| Answer» C. No carbon | |
| 21. |
Which of these are applications of grey cast iron? |
| A. | Camshafts, engine blocks |
| B. | Wear plates, pump linings |
| C. | Brake shoes, pedals |
| D. | Gears, rocker arms |
| Answer» B. Wear plates, pump linings | |
| 22. |
Due to the presence of which of the following does white cast iron appear white? |
| A. | Pearlite |
| B. | Ledeburite |
| C. | Martensite |
| D. | Cementite |
| Answer» E. | |
| 23. |
Up to what thickness can hot box process can be used for production? |
| A. | 10 mm- 40 mm |
| B. | 30 mm- 50 mm |
| C. | 40 mm- 80 mm |
| D. | 70 mm- 100 mm |
| Answer» E. | |
| 24. |
Decomposition of cementite to form ferrite and graphite is known as ______? |
| A. | Decomposition of cast irons |
| B. | Production of cast irons |
| C. | Growth of cast irons |
| D. | Prevention of growth of cast irons |
| Answer» D. Prevention of growth of cast irons | |
| 25. |
Which of the following alloying element is added as a degasser? |
| A. | Silicon |
| B. | Sulphur |
| C. | Nickel |
| D. | Titanium |
| Answer» E. | |
| 26. |
Shell molding process is a costly process for gray iron castings. |
| A. | True |
| B. | False |
| Answer» C. | |
| 27. |
What is the effect of phosphorus and sulphur in cast irons? |
| A. | Induces brittleness |
| B. | Increases strength |
| C. | Destabilizes cementite |
| D. | No effect |
| Answer» B. Increases strength | |
| 28. |
Which of the following alloying element refines pearlite structure? |
| A. | Silicon |
| B. | Sulphur |
| C. | Nickel |
| D. | Titanium |
| Answer» D. Titanium | |
| 29. |
Green sand molding provides the best surface finish. |
| A. | True |
| B. | False |
| Answer» C. | |
| 30. |
An iron with high-silicon content is a _______ |
| A. | White iron |
| B. | Grey iron |
| C. | Malleable iron |
| D. | Pig iron |
| Answer» C. Malleable iron | |
| 31. |
Which of the following alloying element increase hardness? |
| A. | Silicon |
| B. | Sulphur |
| C. | Nickel |
| D. | Titanium |
| Answer» C. Nickel | |
| 32. |
Up to what mass of gray cast irons can shell molds take? |
| A. | 300 kg |
| B. | 400 kg |
| C. | 500 kg |
| D. | 600 kg |
| Answer» D. 600 kg | |
| 33. |
Which element causes cementite to behave in a stable manner? |
| A. | Silicon |
| B. | Sulphur |
| C. | Manganese |
| D. | Carbon |
| Answer» C. Manganese | |
| 34. |
Which of the following alloying element forces the carbon out of the solution? |
| A. | Silicon |
| B. | Sulphur |
| C. | Nickel |
| D. | Titanium |
| Answer» B. Sulphur | |
| 35. |
If the iron surface contains graphite, it is known as ________ |
| A. | Alloy cast iron |
| B. | White iron |
| C. | Grey iron |
| D. | Spheroidal graphite |
| Answer» D. Spheroidal graphite | |
| 36. |
At what temperature does pure iron turn into FCC structure? |
| A. | 800 °C |
| B. | 900 °C |
| C. | 910 °C |
| D. | 810 °C |
| Answer» D. 810 ¬¨¬®‚Äö√†√ªC | |
| 37. |
What is the tensile strength of a thick gray cast iron? |
| A. | 71 MPa |
| B. | 83 MPa |
| C. | 95 MPa |
| D. | 107 MPa |
| Answer» C. 95 MPa | |
| 38. |
Iron obtained from broken ______ is known as white iron. |
| A. | Cementite |
| B. | Graphite |
| C. | Pearlite |
| D. | Bainite |
| Answer» B. Graphite | |
| 39. |
Cast iron tends to be brittle. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 40. |
What would be the tensile strength of a gray cast iron of class 20? |
| A. | 120 MPa |
| B. | 163 MPa |
| C. | 138 MPa |
| D. | 152 MPa |
| Answer» D. 152 MPa | |
| 41. |
Cast iron is a _____ alloy. |
| A. | Eutectic |
| B. | Eutectoid |
| C. | Peritectic |
| D. | Peritectoid |
| Answer» B. Eutectoid | |
| 42. |
How much carbon is present in cast irons? |
| A. | Less than 0.05% |
| B. | Up to 1.5% |
| C. | 1.5% to 2% |
| D. | More than 2% |
| Answer» E. | |