Q.1
The difference between welding at long and short wavelengths is due to _____
  • a) high absorptivity
  • b) high reflectivity
  • c) polarisation
  • d) shroud design
Q.2
The pressure at the centre is a function of the _____
  • a) surface tension
  • b) joint geometries
  • c) material composition
  • d) gap tolerance
Q.3
The gap between the components should be smaller than _____
  • a) half of the beam diameter
  • b) beam diameter
  • c) square of the beam diameter
  • d) one quarter of the beam diameter
Q.4
For welds having larger gaps,_____
  • a) the beam is rotated
  • b) an extra lens is added
  • c) high energy density beam is used
  • d) zif-zag welds are made
Q.5
The welds which do not require filler material are called _____ materials.
  • a) autogenous
  • b) autofiller
  • c) non-filler
  • d) isotropic
Q.6
Which of the following is not affected by the gas shroud?
  • a) Formation of plasma
  • b) Hindrance to the beam
  • c) Absorption of the beam
  • d) Pool width
Q.7
The shroud gas enters the keyhole because of _____
  • a) the fast emission of vapour from the keyhole
  • b) the narrower shape of the keyhole
  • c) higher wavelength of the beam
  • d) molten material
Q.8
Which of the following gases is most favourable as shrouding gases in laser welding?
  • a) Oxygen
  • b) Helium
  • c) Argon
  • d) Chlorine
Q.9
How many issues are there concerning laser welding?
  • a) 2
  • b) 3
  • c) 4
  • d) 5
Q.10
In case of laser welding of dissimilar metals, there are chances of formation of _____
  • a) porous welds
  • b) brittle welds
  • c) thin welds
  • d) cracks
Q.11
Cracking happens due to _____
  • a) shrinkage stress
  • b) improper gas shielding
  • c) high weld speeds
  • d) high wavelength
Q.12
The temperature required for using arc augmented welding phenomenon is around _____
  • a) 100 °C
  • b) 200 °C
  • c) 300 °C
  • d) 400 °C
Q.13
Arc Augmented Laser Welding is used for _____
  • a) higher penetration
  • b) reducing power loss
  • c) stabilizing the arc
  • d) improve wed quality
Q.14
The arc is on the same side of the workpiece as the laser.
  • a) True
  • b) False
Q.15
Weld pool geometry can be controlled by using multiple laser beams.
  • a) True
  • b) False
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