power sources for welding

Which statement supports the fact that metals are good conductors?

• Their electrons are tightly held by the nucleus

• They have many free neutrons

• They have many free electrons

• They have many free proton

Which statement best describes ionization potential?

• The energy required to add an electron to form a negative ion

• The energy required to remove an electron to form a positive ion

• The energy released when a electron is removed from an atom

• The energy required to remove a proton from an atom

Choose the minimum temperatures in the centre of a welding arc column in degrees C

• 500

• 1000

• 5000

• 50,000

A plasma can best be described as

• An ionized gas

• An inert gas

• A good insulator

• A high temperature gas

The major voltage drop(s) in a consumable electrode welding circuit is (are)

• The welding cables

• The work clamp

• The arc plasma

• The anode drop, cathode drop and the arc plasma

The statistic characteristics of a welding power source are indicated on a graph which plots?

• Voltage verses time

• Current verses time

• Energy verses time

• Voltage verses current

The arc starting characteristics of a CC welding power source are determined by?

• The short circuit current

• The slope

• The input voltage

• The open circuit voltage

A voltage sensing wire feed system must be used with a ____ to produce a stable self-regulating welding arc

• CC power source

• CV power source

• CV inverter power source

• CV power source with above average droop

The short circuit current in a CV welding power source is determined by

• The static and dynamic characteristics

• The voltage in the circuit

• The shielding gas employed

• The arc length

Select the correct statement.

• A CC welding power source can be used for the GTAW and PAW processes

• A CC welding power source can be used for the SMAW ans SAW processes

• A CV welding power source can be used for the GMAW and FCAW processes

• All of the above