Q.1
In keyhole mode of laser welding, hole is stabilized by the _____
  • a) weld puddle
  • b) shielding gases
  • c) pressure of the vapour
  • d) laser beam
Q.2
In keyhole mode of laser welding, the keyhole behaves like _____
  • a) optical black body
  • b) an energy reflector
  • c) an energy amplifier
  • d) a shielding
Q.3
Which of the following has the highest joining efficiency?
  • a) Acetylene flame welding
  • b) TIG welding
  • c) Electron beam welding
  • d) Laser welding
Q.4
Flow structures can directly affect the ____
  • a) laser wave formation
  • b) frozen bead
  • c) weld puddle
  • d) porosity
Q.5
During laser welding, any hump on the surface can cause _____
  • a) increase in weld porosity
  • b) flow instability
  • c) higher energy absorption
  • d) decrease in the weld thickness
Q.6
The hot plasma vapour emerging from the keyhole may ionize _____
  • a) shielding gas
  • b) shroud gas
  • c) lasing material
  • d) workpiece material
Q.7
How many of the following process parameters can affect the welding process?
  • a) 1
  • b) 2
  • c) 3
  • d) 4
Q.8
Which of the following does not affect the operating characteristics in laser welding?
  • a) shroud gas composition
  • b) material surface conditions
  • c) component orientation
  • d) shroud design
Q.9
The maximum welding speed varies directly with the power
  • a) True
  • b) False
Q.10
Pulse repletion factor is considered while determining the welding speed.
  • a) True
  • b) False
0 h : 0 m : 1 s