NCCER welding level 1 module 3 (ehove) questions with verified correct answers

Transferred Arc Process The plasma arc cutting process type most commonly used is the. 100% cotton When operating plasma arc cutting equipment it is acceptable to wear a hat made of. 35 % The duty-cycle range for a light-duty unit is typically. Amperage The unit of measure used for the intensity of an electric current; often abbreviated to amp or amps Dross A waste by product of molten metal Duty cycle The percentage of a plasma arc cutting machine can cut without overheating within a 10 minute period. Phase In a three phase power supply system, the sine wave of voltage on each of the three separate conductors is displaced from each of the others by 120°, although all conductors are carrying alternating current at the same frequency and are synchronized. Each of the three sine waves is referred to as phase of the power source. Plasma A fourth state of matter (not solid, liquid,or gas) created by heating a gas to such a high temperature that it boils electrons off the gas molecules (ionization) Potential The relative electrical voltage difference between two points of reference; The electromotive force or difference in potential between two points, expressed in volts. Solenoid Valve A valve used to control the flow of gases or liquids that is open or closed by the action of energized electromagnet Hafnium or thoriated tungsten insert The typical plasma arc cutting torch usually contains a replaceable retaining cup, compromised of a copper electrode with a(n). Cut with more uniform melt rate Some types of PAC torches inject water to create a whirlpool of water around the jet to. Adjustable wrench or correctly sized open-end wrench To remove, attach, or tighten the regulator's connection to a gas cylinder, you would use. Hold the torch directly over the point to be pierced at a 0-degree work angle. To pierce very thin metal with a plasma torch you should. 30,000°F (16,650°C) Plasma arc cutting uses a jet of plasma that can reach temps as high as Transferred arc and non-transferred arc What are the two primary types of plasma arc cutting processes? Ionize the air jet In the transferred arc process, the pilot arc is used to. Not electrically connected to the arc circuit In a non-transferred arc process, the material being cut is Boots with no laces are preferred for welding and cutting. Which of the following statement regarding PAC safety is true? 115VAC, single phase power source Light-duty PAC equipment typically requires a. Are water-cooled Some heavy-duty PAC systems Bearing Severe damage from arcing and overheating can be caused by the PAC current passing through a Mounted on automated carriers Mechanized PAC torches are designed to be 1,500 psi (103 bars) to 2,000 psi (138 bars) Gases other than compressed air are normally supplied in pressurized cylinders at Respirator may be required If site ventilation is not adequate to keep fumes away from the operator, a(n) 7 amps Light-gauge sheet steel may be cut using a cutting amperage as low as 90° to the metal surface Square edges can be cut in thin materials by holding the torch at 1/16 inch (1.6mm) When inspecting an electrode before use, it should be replaced if pits exists and are deeper than Superheating gas in an electric arc In plasma arc cutting, plasma is created by. Faster and more efficient than other cutting methods In most cases, plasmic are cutting is A full leather hood Which of the following PPE It's considered optional for plasma arc cutting? Never carry matches or gas-filled lighters in your pockets Which of the following safety statements related to plasma arc cutting is true? Compressed air The simplest plasma arc cutting units use filtered 3 inches thick Industrial plasma cutting units can cut carbon steel up to. A pilot arc with transferred arc process The most common plasma arc cutting torches use. Retaining cup, copper electrode with hafnium or thoriated tungsten insert, gas swirl ring, and nozzle The typical plasma arc cutting torch contains a The distance between the torch tip and the workplace The term standoff distance refers to Shielding or cooling gas Most heavy duty plasma arc cutting systems require one gas cylinder containing the cutting gas and another containing. Air compressor Some light-duty PAC equipment has a built-in High-cutting amperage Cutting a 2 inch (5 cm) aluminum plate requires a(n) 0° work angle To pierce very thin metal using plasma arc cutting, hold a torch at a Replace the cylinder caps When gas cylinders are disconnected from a plasma arc cutting unit before it is stored, be sure to Moisture entering the unit through the air line Sputtering or hissing at the torch is often caused by. Amperage that it can carry without overheating The workpiece clamp is rated by the