CWB 2 All Module Exams

A Plasma is: A) A gas made up of positive ions and free electrons B) A liquid used to reduce adherence of spatter C) The main component in an inverter power source D) Always present in an electrical circuit - Answer- A) A gas made up of positive ions and free electrons To increase melting rate (burn-off rate) in the shielded metal arc welding (SMAW) process, which polarity should be used? A) DCEP B) ACEP C) DCEN D) ACEP - Answer- C) DCEN Which type of welding power source is used for the SMAW process? A) Constant Current B) Constant Voltage C) Pulsed Current D) Pulsed Voltage - Answer- A) Constant Current The purpose of a drooping welding power source is to produce: A) Constant voltage regardless of the current demand B) Constant arc length regardless of current C) Nearly constant current regardless of voltage fluctuations B) Low open circuit voltage - Answer- C) Nearly constant current regardless of voltage fluctuations A self-regulating welding arc is produced by a: A) Constant current power source with a constant speed wire feed system B) Constant voltage power source with a voltage sensing wire feed system C) Constant current power source D) Constant voltage power source with a constant speed wire feed system - Answer- D) Constant voltage power source with a constant speed wire feed system Short circuit current is determined by the: A) Voltage in the circuit B) Static characteristic of the power source C) Position of welding D) Skill