MCQOPTIONS
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MCQOPTIONS
This section includes 48 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 true for green density? |
| A. | Green density increases when particle strength increases |
| B. | Green density decreases when compacting speed decreases |
| C. | Green density increases when compaction pressure increases |
| D. | Green density decreases when apparent density increases |
| Answer» D. Green density decreases when apparent density increases | |
| 2. |
Which of the following statements is/are false? 1. Ball indenter in Rockwell hardness test is made of diamond 2. Brale indenter in Rockwell hardness test is made of diamond 3. Micro hardness test is used to measure hardness of thin brittle materials |
| A. | Only 1 |
| B. | Only 2 |
| C. | Only 3 |
| D. | All the statements are false |
| Answer» B. Only 2 | |
| 3. |
Which of the following statements is/are true for cold working process? 1. Cold working process does not provide good surface finish 2. Cold working process produces internal stress in a metal 3. Fatigue strength of metals can be improved 4. Cold working process cannot take place below recrystallization temperature |
| A. | statement 1 and statement 2 |
| B. | statement 2 and statement 3 |
| C. | statement 3 and statement 4 |
| D. | all the above statements are true |
| Answer» C. statement 3 and statement 4 | |
| 4. |
Which process is used to remove internal stresses from a metal? |
| A. | Annealing |
| B. | Cold working |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» B. Cold working | |
| 5. |
Which type of composite materials the sandwich panels are? |
| A. | Structural |
| B. | Fiber reinforced |
| C. | Particle reinforced |
| D. | None of the above |
| Answer» B. Fiber reinforced | |
| 6. |
Which type of materials exhibit magnetism only in presence of an electric field? |
| A. | Diamagnetic materials |
| B. | Paramagnetic materials |
| C. | Ferromagnetic materials |
| D. | None of the above |
| Answer» C. Ferromagnetic materials | |
| 7. |
Which type of materials are used as bridges between human tissues and metals? |
| A. | Polymeric biomaterials |
| B. | Ceramic biomaterials |
| C. | Metallic biomaterials |
| D. | All of these |
| Answer» D. All of these | |
| 8. |
Which type of microscope is used to determine particle diameter between (10 to 0.001 μ)? |
| A. | Optical microscope |
| B. | Electron microscope |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» C. Both a. and b. | |
| 9. |
Why are internal stresses not produced in hot working process? |
| A. | Micro structures undergo distortion |
| B. | Hot working process do not undergo recrystallization |
| C. | Hot working process undergo recrystallization |
| D. | None of the above |
| Answer» D. None of the above | |
| 10. |
Which materials can be used to manufacture elastomers? |
| A. | Limestone |
| B. | Petroleum |
| C. | Alcohol |
| D. | All of the above |
| Answer» E. | |
| 11. |
Which among the following rubbers are used for automobile tyres? |
| A. | Only Polyurethane rubbers |
| B. | Only Butadiene rubbers |
| C. | Both Polyurethane and Butadiene are used |
| D. | None of these |
| Answer» D. None of these | |
| 12. |
Which among the following is the characteristics of polymers? |
| A. | High tensile strength |
| B. | High coefficient of friction |
| C. | Low density |
| D. | All of these |
| Answer» D. All of these | |
| 13. |
Which among the following is a type of destructive test? |
| A. | Magnetic particle test |
| B. | Cupping test |
| C. | Dye penetrant |
| D. | All of the above |
| Answer» C. Dye penetrant | |
| 14. |
Which among the following is a paramagnetic material? |
| A. | Iron |
| B. | Cobalt |
| C. | Nickel |
| D. | Aluminum |
| Answer» E. | |
| 15. |
When magnetic field is removed, which type of materials maintain magnetic properties? |
| A. | Ferromagnetic materials |
| B. | Diamagnetic materials |
| C. | Paramagnetic materials |
| D. | All of the above |
| Answer» B. Diamagnetic materials | |
| 16. |
When are the slip lines observed? |
| A. | after plastic deformation |
| B. | before plastic deformation |
| C. | after mechanical working |
| D. | after annealing |
| Answer» B. before plastic deformation | |
| 17. |
What is the effect of temperature on stiffness of a metal? |
| A. | Temperature has no effect on stiffness of a metal |
| B. | As temperature increases stiffness of metal decreases |
| C. | As temperature increases stiffness of metal increases |
| D. | None of the above |
| Answer» C. As temperature increases stiffness of metal increases | |
| 18. |
What is the effect of L/D ratio on compressive strength? |
| A. | compressive strength increases and then remains constant as L/D ratio increases |
| B. | compressive strength decreases and then increases as L/D ratio increases |
| C. | compressive strength decreases and then remains constant as L/D ratio increases |
| D. | none of the above |
| Answer» D. none of the above | |
| 19. |
What is the effect of high temperatures on material properties? |
| A. | loss of cohesive strength |
| B. | increase in stiffness |
| C. | increase in hardness |
| D. | All of the above |
| Answer» B. increase in stiffness | |
| 20. |
What is the byproduct formed by the condensation of methyl alcohol and acetic acid to form ester? |
| A. | water |
| B. | hydrogen |
| C. | oxygen |
| D. | none of the above |
| Answer» B. hydrogen | |
| 21. |
What is meant work hardening process? |
| A. | Ductile materials are deformed plastically at temperatures below crystalline temperatures which increases strength and hardness of the material |
| B. | Ductile materials are deformed plastically at temperatures above crystalline temperatures which increases strength and hardness of the material |
| C. | Ductile materials are deformed plastically at crystalline temperatures which increases strength and hardness of the material |
| D. | None of the above |
| Answer» B. Ductile materials are deformed plastically at temperatures above crystalline temperatures which increases strength and hardness of the material | |
| 22. |
What is meant by specific surface? |
| A. | surface area per unit volume |
| B. | surface area per unit weight |
| C. | surface weight per unit area |
| D. | none of the above |
| Answer» C. surface weight per unit area | |
| 23. |
What is meant by resilience in stress strain curve? |
| A. | area in the plastic region |
| B. | area in the elastic region |
| C. | area in elastic and plastic region |
| D. | none of the above |
| Answer» C. area in elastic and plastic region | |
| 24. |
What is meant by Nil Ductility Transition Temperature (NDT)? |
| A. | Metal gets transformed from brittle to ductile phase |
| B. | Metal gets transformed from ductile to brittle phase |
| C. | Metal gets transformed from malleable to ductile phase |
| D. | Metal gets transformed from elastic to ductile phase |
| Answer» C. Metal gets transformed from malleable to ductile phase | |
| 25. |
What is meant by malleability? |
| A. | Metals undergo plastic deformation under compressive stresses |
| B. | Metals can be drawn into wires |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» B. Metals can be drawn into wires | |
| 26. |
What is meant by low angle boundary? |
| A. | Low angle boundary represents a boundary between crystalline region and its surroundings |
| B. | Low angle boundary is a surface defect which has angular misorientation between the grains |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» C. Both a. and b. | |
| 27. |
What is meant by Frenkel defect? |
| A. | defect in which interstitial position is occupied by missing atoms |
| B. | defect in which positive and negative ions are missing |
| C. | defect in which interstitial position is occupied by extra atom in the crystal without disorganizing the parent atom |
| D. | none of the above |
| Answer» B. defect in which positive and negative ions are missing | |
| 28. |
What is meant by ductility? |
| A. | Metals can be drawn into sheets |
| B. | Metals undergo elastic deformation under tensile loads |
| C. | Metals undergo plastic deformation under tensile loads |
| D. | All of the above |
| Answer» D. All of the above | |
| 29. |
What is meant by atomization? |
| A. | Process of disintegrating molten metal into small particles by use of compressed air |
| B. | Process of fusing small particles of metals into molten mass by water |
| C. | Both A & B |
| D. | None of the above |
| Answer» B. Process of fusing small particles of metals into molten mass by water | |
| 30. |
What happens when thermosetting polymers are heated? |
| A. | They become soft |
| B. | They are deformed |
| C. | They become rigid |
| D. | All of the above |
| Answer» D. All of the above | |
| 31. |
What does primary creep in creep curve indicate? |
| A. | Due to down deformation, resistance of metal increases |
| B. | Due to down deformation, resistance of metal decreases |
| C. | It represents high strain rate |
| D. | It represents creep at constant rate |
| Answer» B. Due to down deformation, resistance of metal decreases | |
| 32. |
What causes transformation of deformed martensite into austenite phase? |
| A. | Heating |
| B. | Cooling |
| C. | both a. and b. |
| D. | all of the above |
| Answer» B. Cooling | |
| 33. |
What are thermoplastics? |
| A. | They are nonlinear polymers, in which rise in temperature increases plasticity |
| B. | They are linear polymers, in which rise in temperature increases plasticity |
| C. | They are linear polymers, in which temperature rise has no effect on plasticity |
| D. | None of the above |
| Answer» C. They are linear polymers, in which temperature rise has no effect on plasticity | |
| 34. |
What are the metal requirements to have creep resistance property? |
| A. | Low melting point |
| B. | High oxidation resistance |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» C. Both a. and b. | |
| 35. |
The materials are continuously magnetized throughout the operation in |
| A. | DC applications |
| B. | AC applications |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» C. Both a. and b. | |
| 36. |
Non-destructive testing is used to determine |
| A. | location of defects |
| B. | chemical composition |
| C. | corrosion of metal |
| D. | All of these |
| Answer» E. | |
| 37. |
In which type of point defect, positive and negative ions are missing from the crystal? |
| A. | Vacancy defect |
| B. | Interstitial defect |
| C. | Schottky defect |
| D. | Substitutional defect |
| Answer» D. Substitutional defect | |
| 38. |
In physico - chemical processes, which factors affect reduction method? |
| A. | Size of particles |
| B. | Shape of materials |
| C. | Reducing agent |
| D. | All of the above |
| Answer» E. | |
| 39. |
Identify the type of destructive testing |
| A. | Radiographic test |
| B. | Dye penetrant test |
| C. | Creep test |
| D. | All of the above |
| Answer» D. All of the above | |
| 40. |
How is Ester produced? |
| A. | Addition polymerization |
| B. | Condensation polymerization |
| C. | Substitutional polymerization |
| D. | None of these |
| Answer» C. Substitutional polymerization | |
| 41. |
Erichsen cupping test is known as |
| A. | creep test |
| B. | torsion test |
| C. | fatigue test |
| D. | formability test |
| Answer» E. | |
| 42. |
Eddy current test is used to detect |
| A. | cracks |
| B. | hardness |
| C. | conductivity |
| D. | All of the above |
| Answer» E. | |
| 43. |
Different conditions favoring electro deposition are |
| A. | low current density |
| B. | high temperature |
| C. | high viscosity |
| D. | All of these |
| Answer» D. All of these | |
| 44. |
Ceramics having nuclear applications can be used as |
| A. | moderators |
| B. | controls |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» D. None of the above | |
| 45. |
Body centered cubic structure has an atomic packing factor equal to |
| A. | 0.74 |
| B. | 0.68 |
| C. | 0.52 |
| D. | None of the above |
| Answer» C. 0.52 | |
| 46. |
Biosensors are used in |
| A. | medical field |
| B. | agricultural field |
| C. | pollution monitoring |
| D. | all of the above |
| Answer» E. | |
| 47. |
Before compacting the metals, which process is annealed to remove the effects of cold working? |
| A. | Machining |
| B. | Crushing |
| C. | Shotting |
| D. | All of these |
| Answer» D. All of these | |
| 48. |
At critical speed of rotation, ball mill rotates at |
| A. | high speed |
| B. | low speed |
| C. | neither slow nor very high speed |
| D. | none of the above |
| Answer» D. none of the above | |