1. What is the function of flux in submerged arc welding?
Correct : D. to prevent sticking of molten metal
2. If the heat transfer efficiency is 0.5 and the melting efficiency is 0.6, then the overall efficiency will be?
Correct : C. 0.30
3. The deflection of the arc in arc blow is by?
Correct : B. magnetic field
4. If the total efficiency is 0.35 in arc welding. Then what is the welding speed in mm/sec if the cross-sectional area is 5mm2, welding power is 2 kW and the heat required in melting the metal is 100 J/mm3.
Correct : A. 1.4
5. Which of the following gas welding process uses constant voltage?
Correct : D. gas metal arc welding
6. In order to prevent oxidation and retain molten metal in stud welding which of the following is used?
Correct : A. ceramic rings
7. Which of the following parameters control the quality of weld?
Correct : B. size of electrode
8. Which of the following can be non-low hydrogen process?
Correct : A. shielded metal arc welding
9. Why hydrogen not used excessively for welding?
Correct : D. affects the weld
10. Which of the following is true about shielded metal arc welding?
Correct : C. cannot be used for metal sheets under 1.5mm thickness
11. Which of the following is not correct about submerged arc welding?
Correct : B. short set-up time
12. Choose the correct option regarding metal- active gas welding?
Correct : D. high deposition rate
13. What is the differentiating factor between flux core arc welding and gas-shielded metal arc welding processes?
Correct : A. structure and chemical composition of electrode
14. Which of the following is true about flux core arc welding?
Correct : C. slag removal required
15. Which of the following welding process is preferred for field application?
Correct : A. shielded metal arc welding
16. Which of the following is not correct about electro slag welding?
Correct : C. multiple electrodes may not be used
17. Which of the following process does not have high deposition rate?
Correct : A. shielded metal arc welding
18. Which of the following can be easily be welded from flash butt welding process?
Correct : D. carbon steel
19. Electrodes used in spot welding are made up of which material?
Correct : D. copper and aluminium
20. Which of the following method is not used in applying pressure in spot welding process?
Correct : A. hand lever
21. What is the maximum power supply needed for the working of spot welding process?
Correct : D. 150 kva
22. What is the minimum power supply needed for the working of spot welding process?
Correct : A. 10 kva
23. Upset butt welding is majorly used in the making of automobile parts.
Correct : B. false
24. In friction welding process, materials are joined by motion between materials.
Correct : B. rubbing
25. All metallic engineering materials which are can be friction welded.
Correct : C. forgeable
26. Friction welding is process.
Correct : B. cost saving
27. Friction welding produces quality joints, with a 100% weld.
Correct : C. butt joint
28. Which of the following is not true about friction welding?
Correct : A. dissimilar metals cannot be joined
29. Which of the following holds true for friction welding?
Correct : D. there are no solidification defects in the welded parts
30. In inertia friction welding energy of welding machine is used.
Correct : C. rotational
31. Weld strength in inertia friction welding is more than direct drive friction welding.
Correct : A. true
32. In direct drive friction welding, lower weld forces are generated.
Correct : A. true
33. Which of the following defects occur due to flux employed and electrode coating?
Correct : A. inclusion of slag
34. Which of the following defects occur when the deposited metal is not focused on the root of weld?
Correct : B. inadequate penetration
35. Which of the following defects occur due to the entrapment of gas bubbles by the freezing dendrites during the cooling of molten pad?
Correct : D. porosity
36. Which of the following defects occur due to filler material having a different rate of contraction compared to parent metal?
Correct : C. cracking in weld metal
37. Which of the following defects occur due to scattering of metal around the vicinity of weld?
Correct : B. spatter
38. Which of the following defects occur due to incorrect welding techniques?
Correct : C. cracking in weld metal
39. Which of the following defects occur at a lower temperature?
Correct : D. cold cracking
40. Precision forging is a type of forging operation in which the metal stocks and dies are controlled very tightly.
Correct : A. true
41. In open die forging process, homogenous deformation of billet has occurred with uniform increase in its diameter.
Correct : B. false
42. Isothermal forging is also known as cold forging operation.
Correct : B. false
43. The metal forging operation can be performed manually or by automation.
Correct : A. true
44. During roll forming, a flat strip is passed number of times through the rollers.
Correct : A. true
45. Which of following is necessary in order to have a good set of rolls?
Correct : C. a smooth flow of material
46. Which of the following is true in case of “too quick” forming (too few passes)?
Correct : C. it distorts the product
47. What is “leg length” or “leg height”?
Correct : A. the maximum vertical dimension of the profile
48. What will be the elongation if a 1in high section is formed in four passes in a mill having a horizontal distance (between passes) of 14in?
Correct : A. 0.04%
49. During roll forming, the strain (elongation) of the outside edge fiber of the strip must remain below the uniform engineering strain (elastic limit).
Correct : A. true
50. What is camber in roll forming?
Correct : A. deviation of the strip edge from a straight line in horizontal plane
51. When forming “Z” sections, the product is twisted in the opposite direction to compensate the machine generated twist.
Correct : A. true
52. Which of the following is a type of extrusion process?
Correct : D. all of the mentioned
53. In direct extrusion process at higher temperature which of the following is used to avoid friction?
Correct : C. molten glasses
54. In which of the following process frictional loss is eliminated at the billet container interface?
Correct : D. hydrostatic
55. In which of the following process fluid medium is used to apply the load on the billet?
Correct : D. hydrostatic
56. Extrusion is similar to?
Correct : A. rolling
57. Which defect arises due to high friction or high speed?
Correct : C. tearing & surface cracking
58. Which of the following defect is also known as bamboo defect?
Correct : C. surface cracking
59. Which of the following defect tends to draw surface oxides and impurities towards the centre of billet?
Correct : D. pipe defect
60. Which of the following defect is also known as fish tailing?
Correct : B. pipe defect
61. For proper stretching operation, the metal sheet should be stressed above its yield strength.
Correct : A. true
62. In stretch forming, forming limit curve (FLC) is defined as a locus of all the limit strains in different strain paths of the sheet metal.
Correct : A. true
63. The stretch forming process is generally performed by using a hydraulic operated ram.
Correct : A. true
64. Rubber forming is a type of forming process in which polyurethane is used as a die material.
Correct : A. true
65. The metal forging operation can only be performed by manual means.
Correct : B. false
66. Which of the following metal forming processes performs squeezing out of material through a hole?
Correct : D. extrusion
67. Metal forming is a process in which the metal is deformed plastically to get into the desired shape.
Correct : A. true
68. Which of the following processes is not the type of bulk forming process in the metal forming?
Correct : A. bending
69. Which of the following manufacturing processes is mainly considered for producing the components of very high strength?
Correct : B. forging
70. In metal forging process, the gravity drop hammers are operated by a ram using steam or pressurized air.
Correct : B. false
71. Which of the following metal forming processes is best suitable for making the wires?
Correct : C. drawing
72. Stretch forming is a sheet metal forming operation in which shearing is taking place to deform the material.
Correct : B. false
73. Metal used for electroforming process absorbs energy from the magnetic field to get deform.
Correct : A. true
74. In the electromagnetic forming process, the forming pulse is kept longer to optimize the use of energy.
Correct : B. false
75. Which of the following methods of forming is not the part of electromagnetic forming?
Correct : C. shearing
76. The process of electromagnetic forming does not require any kind of lubrication.
Correct : A. true
77. Which of the following is the main advantage of using the electromagnetic forming process?
Correct : D. no spring-back
78. What is the maximum pressure required in a compression molding process?
Correct : D. 50 mpa
79. In compression molding, the curing time does not depend on which of the following factors?
Correct : B. curing temperature
80. What is the maximum curing time required in a compression molding process?
Correct : D. 5 minutes
81. What is the minimum pressure required in a transfer molding process?
Correct : A. 20 mpa
82. Speed of production in transfer molding is higher than that of compression molding?
Correct : A. true
83. Thermosetting plastics are generally used for making products of high strength and rigidness.
Correct : A. true
84. Which of the following types of molecular structure present in thermosetting polymers?
Correct : C. cross-linked polymers
85. Polyethylene, polypropylene and polyvinyl chloride (PVC) are the main example of thermosetting polymers.
Correct : B. false
86. Polyurethane plastics are highly reactive to chemical compounds due to lack of elasticity in these plastics.
Correct : B. false
87. Phenolic plastics can also be used as binder for holding plies of wood in making of plywood.
Correct : A. true
88. Thermosetting plastics can be used for manufacturing of windshield for airplane.
Correct : B. false
89. How is the die used in injection molding cooled?
Correct : C. water
90. How does the piston in the clamping unit move?
Correct : A. hydraulic energy
91. Which of the following material is not made by injection molding?
Correct : B. tubes
92. What is the minimum pressure allowed to be given to the injection molding process?
Correct : B. 100 mpa
93. The barrel is used for the opening and closing of the mold.
Correct : B. false
94. In blow molding, to inflate soft plastic, which medium is used?
Correct : A. air
95. Which of the following plastics is not used in blow molding?
Correct : A. terephthalate
96. What is the minimum air pressure required in the blow molding process?
Correct : B. 400 kpa
97. What can be the maximum pressure to be given to plastic for blow molding process?
Correct : C. 800 kpa
98. Which of the following is not a type of blow molding process?
Correct : C. multi-smaller blow molding
99. What is the minimum thickness required by the plastic for vacuum forming?
Correct : A. 0.125 mm
100. What is the maximum thickness that can be allowed for a plastics sheet in a vacuum forming process?