MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 58 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following statements is/are false for heat treatment processes? |
| A. | Martempering process is designed to overcome limitations of quenching |
| B. | Pearlite is obtained as the final phase in martempering process |
| C. | Water is used as quenching medium in Jominy end quench test |
| D. | All of the above |
| Answer» C. Water is used as quenching medium in Jominy end quench test | |
| 2. |
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 | |
| 3. |
Which of the following statements is/are true for erosion corrosion? |
| A. | The dissolution rate of protective film increases due to turbulent flow |
| B. | Erosion corrosion occurs due to high turbulent fluid flow |
| C. | The corrosion rate can be reduced by reducing the velocity of fluid |
| D. | All of the above |
| Answer» E. | |
| 4. |
Which transformation starts after the nucleation of ferrite phase? |
| A. | Bainite transformation |
| B. | Pearlite transformation |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» B. Pearlite transformation | |
| 5. |
Which type of chemical reaction is observed at cathode, in electrochemical corrosion? |
| A. | Oxidation reaction |
| B. | Peretectic reaction |
| C. | Reduction reaction |
| D. | None of the above |
| Answer» D. None of the above | |
| 6. |
Why is gray cast iron annealed? |
| A. | Graphitize carbide |
| B. | Decrease ductility |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» B. Decrease ductility | |
| 7. |
Which of the following processes permit the transformation of austenite to martensite, throughout the cross-section of a component without cracking or distortion? |
| A. | Martempering |
| B. | Marquenching |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» D. None of the above | |
| 8. |
Which of the following photographic papers is used in sulphur printing technique? |
| A. | Bronze bromide paper |
| B. | Copper bromide paper |
| C. | Silver bromide paper |
| D. | None of the above |
| Answer» D. None of the above | |
| 9. |
Which of the following phases has a complex orthorhomic crystal structure? |
| A. | δ-ferrite |
| B. | α-ferrite |
| C. | Austenite |
| D. | Cementite |
| Answer» E. | |
| 10. |
Which of the following parameters is/are false for steel? |
| A. | High carbon content |
| B. | High melting point |
| C. | Low damping capacity |
| D. | None of the above |
| Answer» B. High melting point | |
| 11. |
Which of the following neutral elements neither form carbides nor cause graphitization? |
| A. | Aluminium |
| B. | Chromium |
| C. | Cobalt |
| D. | Copper |
| Answer» D. Copper | |
| 12. |
Which of the following methods measure hardenability of a metal? |
| A. | Brinell hardness method |
| B. | Gross Man's method |
| C. | Rockwell hardness method |
| D. | All of the above |
| Answer» C. Rockwell hardness method | |
| 13. |
Which of the following methods is not used to coat metallic elements to prevent corrosion? |
| A. | Electroplating |
| B. | Metal cladding |
| C. | Metal spraying |
| D. | None of the above |
| Answer» E. | |
| 14. |
Which of the following is the last phase obtained after completing heat treatment cycle in patenting process? |
| A. | Bainite |
| B. | Martensite |
| C. | Pearlite |
| D. | None of the above |
| Answer» D. None of the above | |
| 15. |
Which of the following is an etching reagent used for carbon steels? |
| A. | Nitric acid |
| B. | Picric acid |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» D. None of the above | |
| 16. |
Which of the following is α – β brass? |
| A. | Admiralty brass |
| B. | Brazing brass |
| C. | Cartridge brass |
| D. | All of the above |
| Answer» C. Cartridge brass | |
| 17. |
Which of the following factors increases hardenability of a metal? |
| A. | Alloying elements |
| B. | Fine grain size |
| C. | Very high carbon content in steel |
| D. | All of the above |
| Answer» B. Fine grain size | |
| 18. |
Which of the following elements increase/s chilled depth for chilled cast irons? |
| A. | Silicon |
| B. | Manganese |
| C. | Manganese sulphide |
| D. | All of the above |
| Answer» D. All of the above | |
| 19. |
Which of the following corrosions are caused due to velocity of fluid flow in pipes? |
| A. | Bimetal corrosion |
| B. | Cavitation corrosion |
| C. | Galvanic corrosion |
| D. | Intergranular corrosion |
| Answer» C. Galvanic corrosion | |
| 20. |
Which of the following cold working operations are suitable for α brass? |
| A. | Cold rolling |
| B. | Deep drawing |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» D. None of the above | |
| 21. |
Which of the following alloying elements prevent formation of austenite in high chromium steels? |
| A. | Boron |
| B. | Carbon |
| C. | Manganese |
| D. | Titanium |
| Answer» E. | |
| 22. |
Which of the following alloying elements are deoxidizers? |
| A. | Aluminium |
| B. | Silicon |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» D. None of the above | |
| 23. |
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 | |
| 24. |
Which desulphurising agent is used to remove sulphur from iron during melting? |
| A. | Calcium carbide |
| B. | Sodium carbonate |
| C. | Soda ash |
| D. | All of the above |
| Answer» E. | |
| 25. |
Which carburising method has high production rate? |
| A. | Pack carburising |
| B. | Liquid carburising |
| C. | Gas carburising |
| D. | All of the above |
| Answer» D. All of the above | |
| 26. |
What is the effect of silicon on the structure of cast iron? 1. Blowholes are present in the castings 2. Increases fluidity 3. Influences the solidification of liquid alloys 4. 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 | |
| 27. |
What is the effect of increased carbon content on chilled cast iron? |
| A. | Chilling depth increases |
| B. | Hardness of chilled zone increases |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» C. Both a. and b. | |
| 28. |
What is the crystal structure of δ-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 | |
| 29. |
What is the composition of cartridge brass? |
| A. | 50 % Cu and 50 % Zn |
| B. | 60 % Cu and 40 % Zn |
| C. | 70 % Cu and 30 % Zn |
| D. | 20 % Cu and 80 % Zn |
| Answer» D. 20 % Cu and 80 % Zn | |
| 30. |
What is meant by recalescence in cooling curves? |
| A. | Time required for liquefying solid components |
| B. | Time required for completely solidifying the casted components |
| C. | The cooling curve formed due to latent heat of fission |
| D. | Liberated heat increases temperature of an under cooled liquid metal during nucleation |
| Answer» E. | |
| 31. |
What is meant by corrosion? |
| A. | Chemical reaction between anode, cathode and electrolyte, which leads to loss of metal |
| B. | Deterioration of metals due to reaction with its environment |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» D. None of the above | |
| 32. |
The study of metallographic includes ____ |
| A. | alloy constituents |
| B. | failure analysis |
| C. | metal structure |
| D. | all of the above |
| Answer» E. | |
| 33. |
The solubility of tin in copper above 580°C _______ |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | none of the above |
| Answer» B. increases | |
| 34. |
The rule used to determine composition of various phases in a phase diagram is _____ |
| A. | Gibb's phase rule |
| B. | Lever rule |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» C. Both a. and b. | |
| 35. |
The process of lowering the temperature of a liquid below its freezing point is known as _____ |
| A. | supercooling |
| B. | undercooling |
| C. | both a. and b. |
| D. | none of the above |
| Answer» D. none of the above | |
| 36. |
The process of decomposing martensitic structure, by heating martensitic steel below its critical temperature is called as _______ |
| A. | Austenitizing |
| B. | Quenching |
| C. | Tempering |
| D. | None of the above |
| Answer» D. None of the above | |
| 37. |
The mixture of α-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. | |
| 38. |
The intergranular corrosion can be prevented using ______ |
| A. | stabilized grade of stainless steel containing titanium and niobium as an alloying element |
| B. | low carbon grade of stainless steel |
| C. | both a. and b. |
| D. | none of the above |
| Answer» D. none of the above | |
| 39. |
The gray cast iron has ____ |
| A. | high melting point |
| B. | high thermal conductivity |
| C. | low compressive strength |
| D. | all of the above |
| Answer» C. low compressive strength | |
| 40. |
The erosion corrosion can be controlled by _______ |
| A. | increasing the flow velocity through pipes |
| B. | increasing temperature of fluid |
| C. | minimizing turbulence |
| D. | all of the above |
| Answer» D. all of the above | |
| 41. |
The cooling curve formed when a material is solidified due to latent heat of fusion is called as ______. |
| A. | Undercooling |
| B. | Solidification |
| C. | Thermal arrest |
| D. | Thermometry |
| Answer» D. Thermometry | |
| 42. |
The alloy of Ti + 5% Al, + 2.5 Sn has _______. |
| A. | low temperature stability |
| B. | low strength |
| C. | good corrosion |
| D. | all of the above |
| Answer» D. all of the above | |
| 43. |
Rosettes of tempered carbon in the matrix of ferrite are observed in the microstructure of _____ |
| A. | gray cast iron |
| B. | spheroidal cast iron |
| C. | malleable cast iron |
| D. | none of the above |
| Answer» D. none of the above | |
| 44. |
Nodules of graphite are observed in the microstructure of _______ |
| A. | white cast iron |
| B. | malleable cast iron |
| C. | spheroidal cast iron |
| D. | all of the above |
| Answer» D. all of the above | |
| 45. |
Knife Line Attack is a type of _______ |
| A. | bimetal corrosion |
| B. | intergranular corrosion |
| C. | localized corrosion |
| D. | uniform corrosion |
| Answer» C. localized corrosion | |
| 46. |
Inconol nickel alloy contains _________ |
| A. | 75% Ni, 15% Cr and 9% Fe |
| B. | 75% Ni, 15% Cr and 9% Al |
| C. | 75% Ni, 15% Cr and 9% Mg |
| D. | None of the above |
| Answer» B. 75% Ni, 15% Cr and 9% Al | |
| 47. |
In which of the following methods, surface of a steel component becomes hard due to phase transformation austenite to martensite? |
| A. | Carbonitriding |
| B. | Flame hardening |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» C. Both a. and b. | |
| 48. |
In Muntz metal, if 1% of tin is added it forms _____ |
| A. | admiralty brass |
| B. | naval brass |
| C. | both a. and b. |
| D. | none of the above |
| Answer» C. both a. and b. | |
| 49. |
In mottled cast iron, slow cooling rate is used to obtain ______ |
| A. | white cast iron |
| B. | gray cast iron |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» C. Both a. and b. | |
| 50. |
In monotropic system, transition of one polymorph to another is _____ |
| A. | reversible |
| B. | irreversible |
| C. | either a or b |
| D. | none of the above |
| Answer» C. either a or b | |