2. What is the full form of EBM in the advanced machining processes?
Correct : B. electron beam machining
3. Which of the following are the applications of EBM process?
Correct : D. all of the mentioned
4. What are the values of currents used in EBM process?
Correct : B. 20 and 100 ma
5. What are the values of current densities used in the process of EBM?
Correct : A. 5 and 15 a/cm2
6. Emission current depends up on which of the following factors?
Correct : D. all of the mentioned
7. What are the values of voltages used in the EBM process?
Correct : C. 150 v
8. Which of the following lenses are used for refocussing the electrons in EBM process?
Correct : C. magnetic & electronic lens
9. What are the values of power densities used in the EBM process?
Correct : C. 1.55 mw/mm2
10. What is the frequency of the pulse of electrons used in EBM process?
Correct : D. 104 hz
11. What are the values of material removal rates in EBM process?
Correct : B. 10 mm3/min
12. What are the values of the cavity diameters that are obtained in EBM?
Correct : D. 35 to 40 µm
13. Which of the following are the applications of EBM?
Correct : D. all of the mentioned
14. What is the value of largest diameter of the hole drilled on EBM?
Correct : C. 1.5 mm
15. What is the value of maximum depth of the hole drilled on EBM?
Correct : C. 30 mm
16. What is the value of energy required for bond breaking?
Correct : A. 10 to 20kv
17. 1 and 16000 Hz in Electron beam machining.
Correct : A. ± 10 %
18. Which of the following are the advantages of EBM process?
Correct : D. all of the mentioned
19. There is no limitation imposed on which of the following factors in EBM?
Correct : D. all of the mentioned
20. How much is the capital equipment cost of equipment used in EBM?
Correct : D. high cost
21. How are the production times for a material in electron beam machining?
Correct : D. long
22. Which type of thin cast layer is produced when we use EBM?
Correct : A. thin layer
23. In advanced machining processes, what is the full form of CHM?
Correct : C. chemical milling
24. Of the following, which mechanism is used for the removal of material using Chemical milling process?
Correct : B. chemical dissolution
25. Which of the following solutions cannot be used as chemical reactive solution in CHM?
Correct : C. neutral solution
26. By using Chemical machining, which of the following can be produced?
Correct : D. all of the mentioned
27. Pre cleaning is done on the work piece surface in order to achieve, which of the following factors?
Correct : D. all of the mentioned
28. Special coatings applied on work piece materials in order to protect them from chemical reaction are known as
Correct : A. maskants
29. Type of mask depends on which of the factor/s, given below?
Correct : D. all of the mentioned
30. During Chemical milling, depth of etch is controlled by which factor of immersion?
Correct : A. time
31. What is the range of reagent temperatures used for chemical dissolution in CHM?
Correct : B. 37ᵒc to 85ᵒc
32. In Chemical milling, excessive flow of chemical reagent results in which of the following defects?
Correct : D. all of the mentioned
33. State whether the following statement about Chemical milling is true or false. “At higher temperatures, faster etching rates occur in Chemical milling.”
Correct : A. true
34. Of the following, which ratio defines the etch factor?
Correct : B. undercut to etching depth
35. CHM cannot eliminate which of the following defects?
Correct : D. all of the mentioned
36. Which of the following are the tools required for Chemical milling?
Correct : D. all of the mentioned
37. State which of the following statement is true or false regarding Chemical milling. “Maskants are generally used in CHM, to protect the work piece from the etching chemical agent.”
Correct : A. true
38. Which of the following are the materials used for making maskants?
Correct : D. all of the mentioned
39. What are the properties that a maskant used in Chemical milling should possess?
Correct : D. all of the mentioned
40. Which of the following can be used to apply the maskants on work piece in Chemical milling?
Correct : D. all of the mentioned
41. State whether the following statement is true or false regarding maskants. “After etching, maskants should be removed easily and inexpensively.”
Correct : A. true
42. In maskant application, photo-resist masks ensure which of the following advantages?
Correct : D. all of the mentioned
43. Which of the following, are the main uses of etchants applied in Chemical milling?
Correct : D. all of the mentioned
44. State whether the following statement is true or false about etchants. “Etchants are used for controlling H2 absorption in case of Ti alloys.”
Correct : A. true
45. Scribing plates are used to define, which of the following parameters in Chemical milling?
Correct : A. areas to be exposed
46. Which of the following are can be used as guides for scribing process in Chemical milling?
Correct : D. all of the mentioned
47. Which of the following are the accessories, included in the tooling of Chemical milling?
Correct : D. all of the mentioned
48. Which of the following come under process parameters of Chemical milling?
Correct : D. all of the mentioned
49. State whether the following statement is true or false about Chemical milling. “Maskants, applied on work pieces, are not responsible for CHM process.”
Correct : B. false
50. To machine high quality parts using CHM, which of the following need not be necessary?
Correct : C. frequency of vibrations
51. The process parameters will have direct impact on which of the following factors?
Correct : D. all of the mentioned
52. Which of the following, are the general materials used for maskant application?
Correct : D. all of the mentioned
53. On which of the following factors, MRR will not be depend on?
Correct : C. frequency uniformity
54. Castings having a larger grain size, will show how much surface roughness value?
Correct : D. high
55. Which of the following materials have the highest machining rate and best surface quality?
Correct : A. rolled metal sheets
56. For softer materials, which type of etching rates are obtained?
Correct : B. low
57. For harder materials, which of the following etching rates are obtained?
Correct : D. high
58. State whether the following statement is true or false about etching rates. “As the etching rate increases, low surface roughness values occur.”
Correct : A. true
59. Which of the following are necessary for best surface quality in Chemical milling?
Correct : A. fine grain size and homogenous metallurgy
60. Which of the following are the factors, on which, surface finish depends?
Correct : D. all of the mentioned
61. State whether the following statement is true or false regarding surface finish in CHM. “The surfaces, which are machined using Chemical milling, will have regular lay pattern.”
Correct : B. false
62. Which of the following defects cannot be altered or eliminated using CHM?
Correct : B. surface imperfections
63. Which type of etching rate, mentioned below, produces low surface roughness?
Correct : D. high
64. The depth of cut tolerances increases when machining depths at high machining rates.
Correct : D. larger
65. What is the value of etching rate, which can be achieved using Chemical milling?
Correct : C. 0.050 mm/min
66. What are the tolerance values achieved in Chemical milling, which depend on work piece material and depth of cut?
Correct : A. ± 10%
67. For what value of machining depths, surface roughness sharply increases with depth of cut?
Correct : B. <200 µm
68. What is the value of surface roughness, which is generally obtained using Chemical milling?
Correct : B. 0.1 – 0.8 µm
69. Which of the following can be easily removed using Chemical milling process?
Correct : D. all of the mentioned
70. What are the advantages when we use Chemical milling process?
Correct : D. all of the mentioned
71. Weight reduction is possible, on which type of contours?
Correct : C. complex
72. Simultaneous material removal using Chemical milling, results in which of the following?
Correct : D. all of the mentioned
73. State whether the following statement is true or false regarding the advantages of CHM. “As there are no stresses induced, machining of delicate parts is possible.”
Correct : A. true
74. Which type of taper can be achieved, using Chemical milling, on contours?
Correct : B. continuous
75. State whether the following statement is true or false regarding the advantages? “Capital cost of equipment, for machining large components, is relatively high.”
Correct : B. false
76. Which of the following, are the other advantages of CHM?
Correct : D. all of the mentioned
77. Good surface quality and absence of burr eliminates which of the following?
Correct : D. none of the mentioned
78. State whether the following statement is true or false about advantages. “Extensive web areas and decorative finishes are not possible using CHM.”
Correct : B. false
79. What are the values of scrap rates obtained in Chemical milling?
Correct : B. 3%
80. Which of the following are the limitations of Chemical milling process?
Correct : D. all of the mentioned
81. What is the value of shallow cuts obtained on sheets and plates, when we use CHM?
Correct : C. 12.27 mm
82. Hand masking, scribing and stripping can be difficult, due to which of the following factors?
Correct : D. all of the mentioned
83. Which type of metallurgical surfaces are needed in Chemical milling process?
Correct : A. homogenous
84. Porous castings yield, which type of surfaces in Chemical milling process?
Correct : C. uneven surfaces
85. State whether the following statement regarding the limitations of CHM. “Welded areas etch, at a rate that is same as base metal.”
Correct : B. false
86. Which of the following, indicate the accuracy of scribing by Chemical milling process?
Correct : D. none of the mentioned
87. Which of the following are the other limitations of Chemical milling process?
Correct : D. all of the mentioned
88. Which of the following is not a limitation of Chemical milling process?
Correct : B. low scrap rates
89. Which of the following metals can be machined using the Chemical milling process?
Correct : D. all of the mentioned
90. Which of the following non-metallic materials can be machined using the Chemical milling process?
Correct : D. all of the mentioned
91. Which of the following is the most popular application for weight reduction of aerospace components?
Correct : A. shallow cuts
92. How many designs can be machined from the same sheet in Chemical milling?
Correct : D. multiple
93. CHM is used to thin out walls, web and ribs of parts that have been produces by which of the following processes?
Correct : D. all of the mentioned
94. Removal of sharp burrs come under which application of Chemical milling process?
Correct : C. improving surface characteristics
95. Which of the following can be eliminated from the surfaces using Chemical milling?
Correct : D. all of the mentioned
96. CHM is used to remove the thin surfaces from forgings and castings, at which time of process?
Correct : B. prior to penetration inspection
97. State whether the following statement is true or false regarding the applications of CHM. “Removal of thin surfaces, prior to inspection, is done for detection of hidden defects.”
Correct : A. true
98. In advanced machining processes, what is the full form of ECM?
Correct : B. electrochemical milling
99. In the following scientists, who was the one to introduce first patent on ECM?
Correct : C. gusseff
100. Which of the following material removal mechanisms is implemented by ECM?