To ensure the welding current will not pass through seals, bearings, or other contacting surfaces ...

To ensure the welding current will not pass through seals, bearings, or other contacting surfaces that could be
  damaged from arcing, make sure to correctly position the _____.
 
  a. electrode
  b. air hose
  c. workpiece clamp
  d. arc torch

 Q. 2

Pneumatic controls are most commonly used
 
  A) To move air through the duct of forced air systems
  B) To operate systems with programmable logic control
  C) To control dampers and valves in large commercial systems
  D) To turn on and off small residential air conditioning systems

 Q. 3

Forging to join metals uses:
 
  A) Additional filler metals B) Electric resistance
  C) Heat and pressure D) All of the above