2. In normalizing, one of the following is not correct
Correct : D. the rate of cooling is slow
3. Fine grain sizes are obtained by
Correct : A. slow cooling
4. Which one of the following is not the purpose of full annealing
Correct : D. produces hardest material
5. Annealing is generally done to impart
Correct : B. softness to the material
6. Which of the following processes is used to harden a steel?
Correct : D. quenching
7. The hardness of quenched Martensite
Correct : 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
Correct : C. p-3, q-4, r-2, s-1
9. Dispersion hardening materials can be produced with the help of followinf process
Correct : C. powder metallurgy
10. in case of carbonitriding by diffusion of which elements the surface become harder of the metal
Correct : B. carbon and nitrogen
11. in case of flame hardening the heat source in the form of
Correct : C. oxy-acetelene flame
12. in jominy end quench test sample is quenched by
Correct : A. water
13. martempering is also known as
Correct : C. marquenching
14. In martempering heat treatment, the final phase which obtain
Correct : D. none of the above
15. In petenting process, which is the final phase obtainafter completion of heat treatment
Correct : A. pearlite
16. which of the following metal alloy is suitable for the precipitation hardenable alloy.
Correct : D. al-cu
17. Pearlite is harder than ferrite,this statement is-------
Correct : A. true
18. Cementite is harder than pearlite,this statement id -------
Correct : B. true
19. The Atomic structure of austenite phase is
Correct : D. f.c.c
20. The Atomic structure of martensite is
Correct : B. b.c.t
21. In case of annealing heat treatment process hypoeutectoid steels are heated above --------- temperature
Correct : B. ac3
22. In case of Normalizing heat treatment process hypoeutectoid steels are heated above --------- temperature
Correct : B. ac3
23. In case of hardening heat treatment process hypoeutectoid steels are heated above --------- temperature
Correct : B. ac3
24. In case of Annealing heat treatment process hypereutectoid steels are heated above --------- temperature
Correct : B. ac3
25. In case of hardening heat treatment process hypereutectoid steels are heated above --------- temperature
Correct : B. ac3
26. In case of normalising heat treatment process hypereutectoid steels are heated above --------- temperature
Correct : C. acm
27. One of the following is a transformation product of austenite.
Correct : C. austenite to pearlite
28. One of the following is a transformation product of austenite.
Correct : C. austenite to martensite
29. One of the following is a transformation product of austenite.
Correct : C. austenite to carbide
30. The Chemical formula for cementite is
Correct : A. fe3c
31. Following is one of the heat treatment process.
Correct : C. hardening
32. One of the following is a heat treatment process for metals
Correct : D. all of the above
33. From the following process,one is not a heat treatment process
Correct : D. machining
34. One of the following is a transformation product of austenite.
Correct : D. all of the above
35. Pearlite is madeup of alternate colonies or lamilies of ---------and -------
Correct : C. ferrite and cementite
36. transformation of austenite to bainite starts from nucleation of-------at austenitic grain boundary
Correct : A. ferrite
37. Bainite phase is divided into two types-------and--------
Correct : A. upper bainite and lower bainite
38. Martensite phase is obtain by
Correct : A. fast cooling or quenching
39. The isothermal transformation diagram i.e. TTT diagrams are --------
Correct : C. time temperature transformation
40. In the heat treatment cycle CCT means-------
Correct : C. critical cooling rate
41. Heat treatment can be defined as
Correct : A. heating the metal in a solid state and then cooling it in a different manner
42. One of the main purpose of heat treatment
Correct : D. all of the above
43. one of the following is heat treatment process for metal
Correct : D. none of the above
44. one of the following is a purpose of anneling
Correct : D. all of the above
45. In anneling process the metal from high temp is cooled very slowly in the furnace. This statement is -----
Correct : A. true
46. one of the following cooling rate used for normalizing process
Correct : C. air cooling
47. Which heat treatment process is carried out after hardening process
Correct : C. tempering
48. one of the following is main purpose of Normalizing
Correct : D. all of the above
49. CCR is a minimum cooling rate of steel, by which we get 100% ------phase
Correct : D. martensite
50. One of the following is type of tempering heat treatment
Correct : D. all of the above
51. As the tempering temp increases, hasdness of steel decreases
Correct : B. false
52. In case of Austempering, the quenching which is carried out, from high temp is known as
Correct : C. interrupted cooling
53. In Austempering process, the final phase that is obtain after complete heat treatment cycle
Correct : B. bainite
54. After Austempering process, the phase bainite which obtain is highly hard and brittle phase
Correct : A. false
55. one of the following is main advantage of Austempering process
Correct : D. all of the above
56. hardenability is nothing but……..
Correct : C. ability of metals to get through harden
57. hardenability of a metal or alloy is largely depend upon one of the following factor?
Correct : D. all of the above
58. One of the following defect is aride dur to heat treatment process
Correct : D. all of the above
59. case hardening processes are those where……..
Correct : C. only surface of the component ,whose hardness is incresed
60. In carburisng process which of the following element is diffused in a metal surface?
Correct : C. carbon
61. Out of the following process,one is not valid with respect to carburising process
Correct : D. all of the above
62. heat treatment is never required after carburisig treatment.this statement is …………
Correct : A. false
63. In nitriding process which of the following element is diffused in a surface layer of a steel
Correct : C. nitrogen
64. one of the following is a step for the procedureof precipitation hardening or age hardening?
Correct : D. all of the above
65. One of the following metal alloy is suitable for the precipitation hardenable alloy?
Correct : D. al-cu
66. in case of flame hardening ,the heat source is in the form of …….
Correct : C. oxy-acetylen flame
67. in flame hardening process,the metal surface after heating to high temperature is quenched with ……
Correct : C. water
68. In case of carbonitriding,by diffusion of which elements the surface become harder of a metal
Correct : B. carbon and nitrogen
69. Dislocation are stopped by a ……
Correct : C. grain boundry
70. Finer grain size,higher will be the …
Correct : C. yield stress
71. Work hardening also called as
Correct : C. strain hardening
72. some materials can not be work hardened at normal ambient temp. such as …….. Material.
Correct : B. indium
73. In solid solution strengthening to ……the hardness of material.
Correct : B. increases
74. The number of solute atoms is more……will be the local distortion in the lattice.
Correct : A. greater
75. The press of finely distributed …….particles increases the elastic limit.
Correct : B. hard
76. dispersion hardening materials can be produced with the help of ……process
Correct : C. powder metallurgy
77. out of the following methods ,one is method used flame hardening process?
Correct : D. all of the above
78. for induction hardening process,the heat source is a …..
Correct : A. induction coil carrying current
79. one of the following is main disadvantage of flame hardeing process of nsurface hardeing?
Correct : D. all of the above
80. Due to one of the reason given below,give rise to quench cracking?
Correct : D. all of the above
81. the pearlitic microstructure which is obtain after patenting process is suitable to which manufacturing process