| 1. |
An eutectoid steel consists of |
| A. | wholly pearlite |
| B. | wholly austenite |
| C. | pearlite and ferrite |
| D. | pearlite and cementite |
| Answer» A. wholly pearlite | |
| 2. |
In normalizing, one of the following is not correct |
| A. | it relieves internal stresses |
| B. | it produces a uniform structure |
| C. | the rate of cooling is rapid |
| D. | the rate of cooling is slow |
| Answer» D. the rate of cooling is slow | |
| 3. |
Fine grain sizes are obtained by |
| A. | slow cooling |
| B. | increasing nucleation rate |
| C. | decreasing growth rate |
| D. | fast cooling |
| Answer» A. slow cooling | |
| 4. |
Which one of the following is not the purpose of full annealing |
| A. | refines grains |
| B. | induces softness |
| C. | removes strains and stresses |
| D. | produces hardest material |
| Answer» D. produces hardest material | |
| 5. |
Annealing is generally done to impart |
| A. | hardness to the material |
| B. | softness to the material |
| C. | brittleness to the material |
| D. | high conductivity to the material |
| Answer» B. softness to the material | |
| 6. |
Which of the following processes is used to harden a steel? |
| A. | normalizing |
| B. | annealing |
| C. | carburizing |
| D. | quenching |
| Answer» D. quenching | |
| 7. |
The hardness of quenched Martensite |
| A. | increases with increasing carbon percentage |
| B. | decreases as carbon percentage increases |
| C. | first increases and then remains almost constant as the carbon percentage increases |
| D. | first increases and then decreases as carbon percentage increases. |
| Answer» C. first increases and then remains almost constant as the carbon percentage increases | |
| 8. |
Match the phases of steel in Group I with the crystal structures in Group II P. Martensite 1. bcc Q. Cementite 2. fcc R. Austenite 3. bct S. Ferrite 4. Orthorhombic |
| A. | p-3, q-4, r-1, s-2 |
| B. | p-2, q-3, r-1, s-4 |
| C. | p-3, q-4, r-2, s-1 |
| D. | p-4, q-3, r-2, s-1 |
| Answer» C. p-3, q-4, r-2, s-1 | |
| 9. |
Dispersion hardening materials can be produced with the help of followinf process |
| A. | forging |
| B. | rolling |
| C. | powder metallurgy |
| D. | none of the above |
| Answer» C. powder metallurgy | |
| 10. |
in case of carbonitriding by diffusion of which elements the surface become harder of the metal |
| A. | only carbon |
| B. | carbon and nitrogen |
| C. | only nitrogen |
| D. | none of the above |
| Answer» B. carbon and nitrogen | |
| 11. |
in case of flame hardening the heat source in the form of |
| A. | lpg gas flame |
| B. | furnace oil flame |
| C. | oxy-acetelene flame |
| D. | none of the above |
| Answer» C. oxy-acetelene flame | |
| 12. |
in jominy end quench test sample is quenched by |
| A. | water |
| B. | oil |
| C. | brine water |
| D. | all of the above |
| Answer» A. water | |
| 13. |
martempering is also known as |
| A. | marheating |
| B. | marcooling |
| C. | marquenching |
| D. | none of the above |
| Answer» C. marquenching | |
| 14. |
In martempering heat treatment, the final phase which obtain |
| A. | ferrite |
| B. | austenite |
| C. | pearlite |
| D. | none of the above |
| Answer» D. none of the above | |
| 15. |
In petenting process, which is the final phase obtainafter completion of heat treatment |
| A. | pearlite |
| B. | bainite |
| C. | martensite |
| D. | austenite |
| Answer» A. pearlite | |
| 16. |
which of the following metal alloy is suitable for the precipitation hardenable alloy. |
| A. | al-zn |
| B. | al-ni |
| C. | al-cr |
| D. | al-cu |
| Answer» D. al-cu | |
| 17. |
Pearlite is harder than ferrite,this statement is------- |
| A. | true |
| B. | false |
| C. | not applicable |
| D. | none of the above |
| Answer» A. true | |
| 18. |
Cementite is harder than pearlite,this statement id ------- |
| A. | false |
| B. | true |
| C. | not applicable |
| D. | none of the above |
| Answer» B. true | |
| 19. |
The Atomic structure of austenite phase is |
| A. | b.c.c |
| B. | b.c.t |
| C. | h.c.p |
| D. | f.c.c |
| Answer» D. f.c.c | |
| 20. |
The Atomic structure of martensite is |
| A. | b.c.c |
| B. | b.c.t |
| C. | h.c.p |
| D. | f.c.c |
| Answer» B. b.c.t | |
| 21. |
In case of annealing heat treatment process hypoeutectoid steels are heated above --------- temperature |
| A. | ac1 |
| B. | ac3 |
| C. | acm |
| D. | none of the above |
| Answer» B. ac3 | |
| 22. |
In case of Normalizing heat treatment process hypoeutectoid steels are heated above --------- temperature |
| A. | ac1 |
| B. | ac3 |
| C. | acm |
| D. | none of the above |
| Answer» B. ac3 | |
| 23. |
In case of hardening heat treatment process hypoeutectoid steels are heated above --------- temperature |
| A. | ac1 |
| B. | ac3 |
| C. | acm |
| D. | none of the above |
| Answer» B. ac3 | |
| 24. |
In case of Annealing heat treatment process hypereutectoid steels are heated above --------- temperature |
| A. | ac1 |
| B. | ac3 |
| C. | acm |
| D. | none of the above |
| Answer» B. ac3 | |
| 25. |
In case of hardening heat treatment process hypereutectoid steels are heated above --------- temperature |
| A. | ac1 |
| B. | ac3 |
| C. | acm |
| D. | none of the above |
| Answer» B. ac3 | |
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