1. Which one is used for classifying an electrode used in shielded metal arc welding?
a) Type of flux coating b) Length of the core wire
c) Diameter of the core wire d) Baking temperature of the electrode
2. Name the simplest test which uses sound, to know that there is a crack in a weld.
a) Ultrasonic test b) Stethoscopic test c) Gamma ray test d) X-ray test
3. Which one of the following is a non-destructive test?
a) Impact test b) Tensile test c) Nick break test d) Magnetic particle test
4. Which application can be used for Friction welding?
a) It is used to weld thin metals which are difficult to weld by other process
b) Thicker steel sections can be welded in a single pass in vertical position
c) The ends of thick cylinder sections can be welded without any edge preparation
d) Forgings and casting of heavy thickness can be welded
5. Which application can be used for Electro slag welding?
a) It is used to weld thin metals which are difficult to weld by other process
b) Thicker steel section can be welded in a single pass in vertical position
c) The ends of thick cylinder section can be welded
d) Forgings and casting of heavy thickness can be welded
6. The main advantage of using an iron powder electrode is to……………..
a) Avoids crack in the joint
b) Increases the strength of the flux coating
c) Reduces the time required to complete the weld
d) Easily conducts the electricity through the electrode
7. What is the thermite reaction time
a) 4-6 seconds b) 7-10 seconds c) 11-13 seconds d) 14-17 seconds
8. The current set to weld a 8mm thick MS butt joint using a 4mm size electrode by submerged arc
welding process is ……………….
a) 520 amps b) 620 amps c) 720 amps d) 800 amps
9. What is the advantage in the welding process of using welding low heat input electrode?
a) High quality of weld metal b) Distortion and warp age is less
c) Surfacing can be done in all position d) Very thin layer weld metal can be applied
10. What happened to the welding if the gas flow is not proper in the ‘TIG’ welding process?
a) Lack of penetration b) Porosity c) Crack d) Weld metal become oxidized
11. What is the name of Electronic unit helps to initiate the arc in TIG welding process?
a) Low frequency b) Medium frequency c) High frequency d) Double frequency
12. Forgings and castings of heavy thickness can be welded?
a) Friction welding process b) Electron beam welding
c) Electro slag welding d) Plasma welding
13. What material is used to make gas nozzles in TIG welding process?
a) Clay b) Ceramic c) Backlite d) Ilam
14. What will happen unsafe welding practice keeping the welding floor in wet condition?
a) Eye injury b) Burn injury c) Electric shock d) Cut on the legs
15. What is the function of wire feeder in MIG-MAG welding?
a) To transmit the current effectively b) To carry the welding current
c) Wire feed response to signal d) To control wire feed rate to parameter rate
16. “To make butt weld down hand position” Which one of the metal transfer is used for “MIG-MAG”
welding?
a) Globular transfer b) Spray transfer c) Repelled transfer d) Pulsed spray transfer
17. What is the filler wire diameter used for the 8 mm thick by MIG-MAG welding?
a) 0.8 mm b) 1.2 mm c) 1.6 mm d) 2.2 mm
18. What is the standard distance to be maintained between conduct tip and filler wire?
a) 17-20 mm b) 14-16 mm c) 6-13 mm d) 1-5 mm
19. Which shielding gas has low density compared to air in MIG/MAG welding?
a) Helium b) Argon c) Carbon dioxide d) Neon
20. Choose the other name of pulling welding technique by GMAW
a) Forward b) Backward c) Pushing d) Pressure
21. Which one of the following defects can be tested found by a nick break test on a ‘T’ joint?
a) Cracker cracks b) Surface cracks c)Lack of root penetration d) Insufficient throat thickness
22. Which of the welding is widely used for welding stainless steel?
a) TIG welding b) MIG welding c) CO2 d) MMA welding 23. What is the color of inert gas cylinder used in ‘TIG’-welding?
a) Maroon b) Black c) Peacock blue d) Red
24. Which type of joint can be welded by seam welding process?
a) T-filler joint b) Butt joint c) Corner joint d) Lap filler joint
25. What is the material of the wheel shaped seam welding electrode?
a) Brass b) Bronze c) Stainless steel d) copper
26. What is the pre-heating temperature of copper metal?
a) 100 ̊C to 130 ̊C b) 270 ̊C to 425 ̊C c) 150 ̊C to 260 ̊C d) above 425 ̊C
27. Which welding process has high velocity electrons strike the welding surface of the job?
a) Laser beam welding b) Plasma arc welding
c) Electron beam welding d) Electron slag welding
28. In which modern welding process, the accelerating voltage is used as a process variable?
a) Laser beam welding b) Plasma arc welding
c) Electron beam welding d) Electron slag welding
29. Which defect can be eliminated by widening the weld bead intentionally in electron beam welding
process?
a) Sound cracking b) Discontinuity cracking
c) Necklace cracking d) Solidification cracking
30. Mention the principle of electron beam welding?
a) Concentrated and capable of melting thin and thick metals
b) Non concentrated of melting of metals
c) Low energetic of electron beam
d) Welding chamber is not required
31. Which is the only position in which Electro-slag welding is done?
a) Down-hand b) Horizontal c) Vertical d) Over-head
32. What is the permissible stub end length of flux coated Electrode that can be thrown as waste in
shielded metal Arc welding?
a) 30-35 mm b) 40-50 mm c) 55-60 mm d) 65-70 mm
33. Which statement is used for shielded metal arc welding process?
a) Welding is done in vacuum b) High metal deposition rate
c) Base wire electrode is used d) Welding can be done in all position
34. What is the purpose of used Run ON and Run OFF plates?
a) To control arc blow b) To control distortion c) To improve hardness d) To get uniform metal deposition
35. If base metal and filter metal does not melt in correct profile, what defect will occur?
a) Crack b) Porosity c) Weld metal become oxidized d) Lack of fusion
36. What defects can be occurred, if an inert gas flow is not proper?
a) Spatters b) Concave bead c) Oxidation of weld metal d) Under cut
37. Which defect can be prevented by preheating the job?
a) Undercut b) Porosity c) Blow hole d) Crack
38. What is the purpose of Nozzle in ‘TIG’ welding torch?
a) To create the arc b) To protect the gas c) To sent the feeding wire d) To control the gas
39. What is the standard distance to be maintained between contact tip and filler wire?
a) 14-16 mm b) 17-20 mm c) 6-13 mm d) 1-5 mm
40. What is the filler wire diameter used for the 8 mm thick by MIG-MAG welding?
a) 0.8 mm b) 1.2 mm c) 1.6 mm d) 2.2 mm
41. There are different types of metal transfer method are used in MIG/MAG welding. In which metal
transfer method the Electrode is melted to drops and transferred per second according to current
value.
a) Globular b) Gas Expansion c) Gravity force d) Electric force
42. In MIG-MAG welding the incorrect tip to match the wire dia., what type of defect will occur?
a) Undercut b) Weld overlap c) unstable arcing d) Stay arcing
43. In MIG/MAG welding arc voltage is too high. What defects will occur from the weld zone?
a) Cracked weld b) Incomplete penetration c) Too much spatters d) Under cut
44. What is the function of contact tip in MIG-MAG welding?
a) To hold the filter wire b) Transmit the current effectively
c) Wire feed response to signal d) To control wire feed rate to parameter rate
45. To give the very fine droplets, which one of the metal transfer is used for MIG-MAG welding?
a) Globular transfer b) Spray transfer c) Pulsed spray transfer d) Repelled transfer
46. What is the shape of tip of tungsten Electrode used in AC welding?
a) Spherical and b) point end c) Flat end d) Angle end
47. Which one of the following defects can be detected by using a liquid penetrant test?
a) Overlap b) Undercut c) Surface crack d) Lack of fusion
48. What is the melting point of tungsten Electrode?
a) 3500 ̊C b) 3410 ̊C c) 3350 ̊C d) 3290 ̊C
49. Resistance welding electrode are cooled by ,,,,,,,,,, a) Atmospheric air b) water c) oxygen gas d) coolant oil
50. Which power source is suitable for GMAW?
a) A.C b) D.C c) D.C constant voltage d) D.C low voltage
