NACE CIP 1 | Questions with 100% Correct Answers | verified

High-Voltage AC Holiday Detector - This uses a 110 V or 220 V power supply. The AC detector is based on the principle of the Tesla coil and does not use a ground wire. The probe emits a blue corona, which is attracted to any ground. High-Voltage Constant Current DC Holiday Detector - This instrument is used to detect coating holidays in dielectric coatings. Once the voltage is set, pass the electrode over the sur- face. A spark will arc through the air gap, causing the detector to emit an audible sound. High-Voltage Pulse-Type DC Holiday Detector - This instrument is ideal for use in moist conditions. Pass the electrode over the surface. A spark will arc through the air gap at any hol- idays, voids, or discontinuities, causing the detector to emit an audible sound. Low-Voltage Holiday Detector - This instrument is a sensitive, low-voltage (wet-sponge) electronic device powered by a battery with output voltages ranging from 5-120 V DC. BMR (Base Metal Readings) - To adjust for surface roughness, measure the blast profile of the steel to be painted at a number of spots to obtain a representative average value. This average value is the base metal reading (BMR). DFT Gauge (Type 1) - instruments are described as magnetic pull-off gauges. The force required to pull a magnet from a ferrous surface is used to determine the film thickness. DFT Gauge (Type 2) - instruments are electronic gauges. They use electronic circuitry to convert a reference signal into coating thickness. BMR (Base Metal Readings) - To adjust for surface roughness, measure the blast profile of the steel to be painted at a number of spots to obtain a representative average value. This average value is the base metal reading (BMR).