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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