GTAW is most commonly performed using _____.

GTAW is most commonly performed using _____.
 
  a. constant voltage
  b. alternating current with low frequency
  c. direct current electrode positive (DCEP)
  d. direct current electrode negative (DCEN)

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[Ques. 2] Setting the amperage at 200 amps for a welding machine that is rated 300 amps at 60 -percent duty cycle will
  _____.
 
  a. reduce the shielding gas flow rate by 30 percent
  b. cause excessive nozzle vibration
  c. increase the duty cycle to 100 percent
  d. allow welding current to be pulsed

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[Ques. 3] In the atmosphere near the weld, the UV radiation from the GTAW process can ionize _____.
 
  a. dust
  b. helium
  c. oxygen
  d. hydrogen

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[Ques. 4] If you see the label TIG on a welding machine, that machine is considered to be what kind of a welding
  machine?
 
  a. Stick
  b. FCAW
  c. GMAW
  d. GTAW

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[Ques. 5] The two principal shielding gases used for GTAW are _____.
 
  a. argon and helium
  b. nitrogen and oxygen
  c. argon and carbon dioxide
  d. hydrogen and carbon dioxide