Engineering Metallurgy solved MCQs

1 of 4

1. An eutectoid steel consists of

a. wholly pearlite

B. wholly austenite

c. pearlite and ferrite

d. pearlite and cementite

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

3. Fine grain sizes are obtained by

a. slow cooling

B. increasing nucleation rate

c. decreasing growth rate

d. fast 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

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

6. Which of the following processes is used to harden a steel?

a. normalizing

B. annealing

c. carburizing

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.

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

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

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

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

12. in jominy end quench test sample is quenched by

a. water

B. oil

c. brine water

d. all of the above

13. martempering is also known as

a. marheating

B. marcooling

c. marquenching

d. none of the above

14. In martempering heat treatment, the final phase which obtain

a. ferrite

B. austenite

c. pearlite

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

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

17. Pearlite is harder than ferrite,this statement is-------

a. true

B. false

c. not applicable

d. none of the above

18. Cementite is harder than pearlite,this statement id -------

a. false

B. true

c. not applicable

d. none of the above

19. The Atomic structure of austenite phase is

a. b.c.c

B. b.c.t

c. h.c.p

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

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

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

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

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

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

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