MCQOPTIONS
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MCQOPTIONS
This section includes 176 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 one of the following metals would work-harden more quickly than the others__________________? |
| A. | copper |
| B. | brass |
| C. | lead |
| D. | silver |
| E. | aluminium |
| Answer» C. lead | |
| 2. |
White cast iron contains carbon in the form of__________________? |
| A. | free carbon |
| B. | graphite |
| C. | cementite |
| D. | white carbon |
| E. | ferrite |
| Answer» D. white carbon | |
| 3. |
White cast iron__________________? |
| A. | contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron |
| B. | is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable |
| C. | is produced by annealing process. It is soft, tough and easily machined metal |
| D. | is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the m |
| E. | none of the above |
| Answer» C. is produced by annealing process. It is soft, tough and easily machined metal | |
| 4. |
White metal contains__________________? |
| A. | 63 to 67% nickel and 30% copper |
| B. | 88% copper and 10% tin and rest zinc |
| C. | alloy of tin, lead and cadmium |
| D. | silver and chromium |
| E. | malleable cast iron and silver |
| Answer» D. silver and chromium | |
| 5. |
Wrought iron is________________? |
| A. | hard |
| B. | high in strength |
| C. | highly resistant to corrosion |
| D. | heat treated to change its properties |
| E. | least resistant to corrosion |
| Answer» D. heat treated to change its properties | |
| 6. |
Which of the following represents the allotropic forms of iron__________________? |
| A. | alpha iron, beta iron and gamma iron |
| B. | alpha iron and beta iron |
| C. | body centred cubic a-iron and face centred cubic a-iron |
| D. | alpha iron, gamma from and delta iron |
| E. | none of the above |
| Answer» E. none of the above | |
| 7. |
Which of the following pipes is least corrosion resistant__________________? |
| A. | brass |
| B. | mild steel |
| C. | cast iron |
| D. | wrought iron |
| E. | copper |
| Answer» E. copper | |
| 8. |
Which of the following is used for bearing liner_______________? |
| A. | gun metal |
| B. | bronze |
| C. | bell metal |
| D. | babbit metal |
| E. | brass |
| Answer» E. brass | |
| 9. |
Which of the following is the binding material in cemented carbides___________________? |
| A. | cobalt |
| B. | nickel |
| C. | vanadium |
| D. | iron |
| E. | carbon |
| Answer» B. nickel | |
| 10. |
Which of the following is not the correct method of increasing fatigue limit __________________? |
| A. | shot peening |
| B. | nitriding of surface |
| C. | cold working |
| D. | surface decarburisation |
| E. | under-stressing |
| Answer» E. under-stressing | |
| 11. |
Which of the following has highest specific strength of all structural materials__________________? |
| A. | magnesium alloys |
| B. | titanium alloys |
| C. | chromium alloys |
| D. | magnetic steel alloys |
| E. | none of the above |
| Answer» C. chromium alloys | |
| 12. |
Which of the following elements does not impart hardness to steel__________________? |
| A. | copper |
| B. | chromium |
| C. | nickel |
| D. | silicon |
| E. | none of the above |
| Answer» B. chromium | |
| 13. |
Which of the following element results in presence of free graphite in C.I_________________? |
| A. | carbon |
| B. | sulphur |
| C. | silicon |
| D. | manganese |
| E. | phosphorous |
| Answer» D. manganese | |
| 14. |
Which of the following constituents of steels is softest and least strong ________________? |
| A. | austenite |
| B. | pearlite |
| C. | ferrite |
| D. | cementlte |
| E. | bainite |
| Answer» D. cementlte | |
| 15. |
Which of the following alloys does not contain tin_________________? |
| A. | white metal |
| B. | solder admiralty |
| C. | fusible metal |
| D. | phosphor bronze |
| E. | gun metal |
| Answer» B. solder admiralty | |
| 16. |
Which of the following alloys does not have copper as one of the constituents________________? |
| A. | delta metal |
| B. | monel metal |
| C. | constantan |
| D. | nichrome |
| E. | silicon bronze |
| Answer» E. silicon bronze | |
| 17. |
Which is the false statement about wrought iron. It has________________? |
| A. | high resistance to rusting and corrosion |
| B. | high ductility |
| C. | ability of hold protective coating |
| D. | easily weldable characteristics |
| E. | uniform strength in all directions |
| Answer» F. | |
| 18. |
Which is false statement about tempering. Tempering is done to_______________? |
| A. | improve machinability |
| B. | improve ductility |
| C. | improve toughness |
| D. | release stresses |
| E. | reduce hardness and brittleness |
| Answer» B. improve ductility | |
| 19. |
Which is false statement about properties of aluminium ___________________? |
| A. | modulus of elasticity is fairly low |
| B. | wear resistance is very good |
| C. | fatigue strength is not high |
| D. | creep strength limits its use to fairly low temperatures |
| E. | corrosion resistance is good |
| Answer» C. fatigue strength is not high | |
| 20. |
Which is false statement about normalizing. Normalizing is done to _________________? |
| A. | refine grain structure |
| B. | reduce segregation in casting |
| C. | improve mechanical properties |
| D. | induce stresses |
| E. | relieve internal stresses |
| Answer» E. relieve internal stresses | |
| 21. |
Which is false statement about annealing. Annealing is done to________________? |
| A. | relieve stresses |
| B. | harden steel slightly |
| C. | improve machining characteristic |
| D. | soften material |
| E. | permit further cold working |
| Answer» C. improve machining characteristic | |
| 22. |
Which is false statement about case hardening. Case hardening is done by_______________? |
| A. | electroplating |
| B. | cyaniding |
| C. | induction hardening |
| D. | nitriding |
| E. | flame hardening |
| Answer» B. cyaniding | |
| 23. |
Weld decay is the phenomenon found with _________________? |
| A. | cast iron |
| B. | mild steel |
| C. | non-ferrous materials |
| D. | wrought iron |
| E. | stainless steel |
| Answer» F. | |
| 24. |
Vanadium in high speed steels__________________? |
| A. | promotes decarburisation |
| B. | provides high hot hardness |
| C. | forms very hard carbides and thus in-creases wear resistance |
| D. | promotes retention of austenite |
| E. | increases toughness |
| Answer» D. promotes retention of austenite | |
| 25. |
Tungsten in steel________________? |
| A. | improves wear resistance, cutting ability and toughness |
| B. | refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties |
| C. | improves cutting ability and reduces hardenability |
| D. | gives ductility, toughness, tensile strength and anticorrosion properties |
| E. | raises its melting point |
| Answer» C. improves cutting ability and reduces hardenability | |
| 26. |
Tungsten in high speed steel provides________________? |
| A. | hot hardness |
| B. | toughness |
| C. | wear resistance |
| D. | sharp cutting edge |
| E. | cold hardness |
| Answer» B. toughness | |
| 27. |
The usual composition of a soldering alloy is__________________? |
| A. | tin, lead and small percentage of antimony |
| B. | tin and lead |
| C. | tin, lead and silver |
| D. | tin and copper |
| E. | tin, copper and lead |
| Answer» B. tin and lead | |
| 28. |
The unique property of cast iron is its high ___________________? |
| A. | malleability |
| B. | ductility |
| C. | surface finish |
| D. | damping characteristics |
| E. | hardness |
| Answer» E. hardness | |
| 29. |
The ultimate tensile strength of low carbon steel by working at a high strain rate will_________________? |
| A. | decrease |
| B. | increase |
| C. | remain constant |
| D. | first increase and then decrease |
| E. | first decrease and then increase |
| Answer» C. remain constant | |
| 30. |
The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to l00°C will _________________? |
| A. | increase |
| B. | decrease |
| C. | remain same |
| D. | first increase and then decrease |
| E. | show unpredictable behaviour |
| Answer» B. decrease | |
| 31. |
The transistor is made of___________________? |
| A. | silver |
| B. | gold |
| C. | copper |
| D. | germanium |
| E. | german silver |
| Answer» E. german silver | |
| 32. |
The tensile strength of wrought iron is maximum _________________? |
| A. | along the lines of slag distribution |
| B. | perpendicular to lines of slag distribution |
| C. | uniform in all directions |
| D. | unpredictable |
| E. | none of the above |
| Answer» B. perpendicular to lines of slag distribution | |
| 33. |
The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is _______________? |
| A. | 770°C |
| B. | 910°C |
| C. | 1050°C |
| D. | below recrystallisation temperature |
| E. | above recrystallization temperature |
| Answer» B. 910°C | |
| 34. |
The surface hardness of the following order is achieved by nitriding operation__________________? |
| A. | 600 VPN |
| B. | 1500 VPN |
| C. | 1000 to 1100 VPN |
| D. | 250 VPN |
| E. | 2000 VPN |
| Answer» D. 250 VPN | |
| 35. |
The presence of sulphur in pig iron makes__________________? |
| A. | it easily machinable |
| B. | it brittle |
| C. | it hard |
| D. | the casting unsound |
| E. | increases the fluidity |
| Answer» E. increases the fluidity | |
| 36. |
The percentage of carbon in grey iron castings usually varies between __________________? |
| A. | 0.5 to 1% |
| B. | 1 – 2% |
| C. | 2.5 to 4.5% |
| D. | 5 – 7% |
| E. | 7-9%. |
| Answer» D. 5 – 7% | |
| 37. |
The percentage of carbon in pig iron varies from___________________? |
| A. | 0.1 to 1.2% |
| B. | 1.5 to 2.5% |
| C. | 2.5 to 4% |
| D. | 4 to 4.5% |
| E. | 4.5 to 6.3%. |
| Answer» E. 4.5 to 6.3%. | |
| 38. |
The percentage of carbon in low carbon steel is__________________? |
| A. | 0.05% |
| B. | 0.15% |
| C. | 0.3% |
| D. | 0.5% |
| E. | 0.7%. |
| Answer» C. 0.3% | |
| 39. |
The number of electrons in 1 cm3 of metal would be of the order of_______________? |
| A. | 1010 |
| B. | TO16 |
| C. | 1022 |
| D. | 1040 |
| E. | 1052 |
| Answer» D. 1040 | |
| 40. |
The most effective inhibitor of grain growth, when added in small quantities is__________________? |
| A. | carbon |
| B. | vanadium |
| C. | manganese |
| D. | cobalt |
| E. | copper |
| Answer» C. manganese | |
| 41. |
The molecules in a solid move______________? |
| A. | in a random manner |
| B. | in a haphazard way |
| C. | in circular motion |
| D. | back and forth like tiny pendulums |
| E. | do not move |
| Answer» E. do not move | |
| 42. |
The metallic structure of mild steel is_________________? |
| A. | body centred cubic |
| B. | face centred cubic |
| C. | hexagonal close packed |
| D. | cubic structure |
| E. | orthorhombic crystal |
| Answer» B. face centred cubic | |
| 43. |
The machinability of steel is increased by___________________? |
| A. | silicon and sulphur |
| B. | phosphorous, lead and sulphur |
| C. | sulphur, graphite and aluminium |
| D. | phosphorous and aluminium |
| E. | none of the above |
| Answer» C. sulphur, graphite and aluminium | |
| 44. |
The loss of strength in compression with simultaneous gain in strength in tension due to overloading is known as________________? |
| A. | hysteresis |
| B. | creep |
| C. | visco elasticity |
| D. | Boeschinger effect |
| E. | inelasticity |
| Answer» E. inelasticity | |
| 45. |
The hardness of steel increases if it contains____________________? |
| A. | austenite |
| B. | martensite |
| C. | pearlite |
| D. | cementite |
| E. | all of the above |
| Answer» C. pearlite | |
| 46. |
The hardness of steel primarily depends on _____________________? |
| A. | %age of carbon |
| B. | %age of alloying elements |
| C. | heat treatment employed |
| D. | method of manufacture |
| E. | shape of carbides and their distribution in iron |
| Answer» F. | |
| 47. |
The following types of materials are usually the most ductile__________________? |
| A. | face-centred cubic lattice |
| B. | body-centred cubic lattice |
| C. | hexagonal close-packed lattice |
| D. | all of the above |
| E. | none of the above |
| Answer» B. body-centred cubic lattice | |
| 48. |
The following element can’t impart high strength at elevated temperature__________________? |
| A. | manganese |
| B. | magnesium |
| C. | nickel |
| D. | silicon |
| E. | none of the above |
| Answer» C. nickel | |
| 49. |
The elastic stress strain behaviour of rubber is_____________________? |
| A. | linear |
| B. | non-linear |
| C. | plastic |
| D. | no fixed relationship |
| E. | unpredictable behaviour |
| Answer» C. plastic | |
| 50. |
The crystal structure of gamma iron is_________________? |
| A. | body centred cubic |
| B. | face centred cubic |
| C. | hexagonal close packed |
| D. | cubic structure |
| E. | orthorhombic crystal |
| Answer» C. hexagonal close packed | |