Chapter 5 group 2

What does Direct Current Reverse Polarity (DCRP) involve?

• The current crosses the arc to the electrode, then to the electrode holder, and returns to the machine through the electrode lead.

• The current flows directly from the machine to the electrode.

• The current bypasses the electrode holder.

• The current flows in a circular loop without crossing the arc.

What is the characteristic of Direct Current Straight Polarity (DCSP)?

• Direct current electrode positive

• Direct current electrode negative

• Alternating current electrode positive

• Alternating current electrode negative

Why are some electrodes referred to as drag electrodes?

• They can be used in any position.

• They can only be used in flat horizontal positions.

• They are used for vertical welding.

• They are used for overhead welding.

What type of curve do droop curve machines have?

• Flat volt-ampere curve

• Steep volt-ampere curve

• Linear volt-ampere curve

• Curved volt-ampere curve

What is the duty cycle of a welding machine?

• The time it can be used continuously at its rated output in any ten minute period.

• The time it can be used continuously in a day.

• The time it can be used continuously in an hour.

• The time it can be used continuously in a week.

What are field windings?

• Stationary wire wound magnets

• Rotating wire wound magnets

• Stationary copper coils

• Rotating copper coils

What does inductive reactance do?

• Decreases the resistance of the secondary circuit

• Increases the resistance of the secondary circuit

• Maintains the resistance of the secondary circuit

• Eliminates the resistance of the secondary circuit

What is the function of an inverter in welding?

• Changes incoming AC current to DC, then back to high frequency AC

• Changes incoming DC current to AC, then back to high frequency DC

• Changes incoming AC current to high frequency AC

• Changes incoming DC current to high frequency DC

What is the purpose of low-hydrogen electrodes?

• Deposit a maximum of hydrogen in the weld

• Deposit a minimum of hydrogen in the weld

• Deposit no hydrogen in the weld

• Deposit a moderate amount of hydrogen in the weld

What is a characteristic of droopers in welding machines?

• They have a flat volt-ampere curve

• They have a steep volt-ampere curve

• They have a linear volt-ampere curve

• They have a curved volt-ampere curve