CWEA E1 Study Set Questions With Correct Answers

Confined Space - Answer A space that: -is large enough to enter and work. -has limited or restricted means for entry. -is not designed for continuous occupancy. Hot Work Permit - Answer An employer's written authorization to perform work capable of providing a source of ignition. Inerting - Answer A form of purging or ventilating a confined space where an inert gas (such as nitrogen, carbon dioxide or argon) is used to displace the atmosphere in a confined space to remove fire or explosion hazards. Causes oxygen levels to become unstable for re-entry. Oxygen Safe Zone - Answer 19.5% to 23.5% Below 19.5=unsafe for breathing Above 23.5=explosive Leader Line - Answer The part or area of a drawing to which a number, note or other reference applies. They are solid lines and usually terminate in a single arrowhead. Hydraulic Term: "Resistance" - Answer A construction in the bore of the pipe which requires more pressure to pass the same amount of water. Hydraulic Term: "Voltage" (Assume water is flowing horizontally so gravity isn't a factor) - Answer Electric potential is equivalent to pressure and the voltage (or voltage drop/potential difference) is the difference in pressure between two points. Hydraulic Term: "Current" - Answer Equivalent to a hydraulic volume flow rate; that is the volumetric quantity of flowing water over time. Ohm's Law - Answer Current through a conductor between two points is directly proportional to the voltage across the two points. S.O.P. - Answer Standard operating procedure. N.E.C. - Answer National Electrical Code. N.F.P.A. - Answer National Fire Protection Association NPT - Answer National pipe thread. Tapered pipe. Compound Gauge - Answer Displays negative AND positive pressure measurements Cat1 Meter - Answer Measures electronics Cat2 Meter - Answer Measures single-phase receptacles. Cat3 Meter - Answer Measures 3 phase distribution and single phase lighting equipment. Cat4 Meter - Answer Measures 3 phase at utility connection and any outdoor connections. L.O.T.O. - Answer Lock out tag out is an osha regulation. 3 elements needed to start a fire. - Answer Heat, oxygen and fuel. Class C fire. - Answer Electrical fire What is Rust - Answer Combination of water, oxygen and iron. Micrometer Torque Wrench does what when setting is reached? - Answer Clicks. V.F.D. - Answer Variable frequency drive used for AC motor speed in hertz. Bourdon Tube Gauge shape - Answer C shaped. 1 PSI = ? feet of water. - Answer 2.31 Partial Flume - Answer A device used to measure the flow in an open channel. The flume narrows to a throat of fixed dimensions and then expands again. The rate of flow can be calculated by measuring the difference in head (pressure) before and at the throat of the flume. Measuring at sea level and 8000' does an O2 sensor need recalibration. - Answer Yes, because of pressure difference. Hysteresis - Answer Input ascending and descending Turbine Flow Meters provide what kind of signal? - Answer Provide a frequency or pulse output signal What happens to wire resistance when temperature rises 10 degrees Celsius? - Answer It decreases 10%. Inductor - Answer Coil of wire that opposes any change in current. Magnetic Flow Meters show what when the water is low in conductivity? - Answer 0 reading if the fluid is low in conductivity. "Empty Meter" Purple U.S.A. marking. - Answer Reclaimed water. Orange U.S.A. marking. - Answer Telecommunication, alarm or signal lines conduit. Red U.S.A. marking. - Answer Electric power lines, cables or conduit. What happens when a motor loses one phase out of 3? - Answer Single phasing will cause the motor to trip the overload heaters. What does a Pitot tube do? - Answer Measures velocity of low to medium gas flow applications. PH range? - Answer 0-14 7 is neutral. Less than 7 is acidic. More than 7 is base (alkaline) How long is a confined space permit valid for according to OSHA? - Answer No longer than it takes to get the work done. Entry permits are valid for more than one shift if permit info contains provisions covering shifts. The voltage from phase to ground in a 480v transformer is? - Answer 277 volts. Signal range for pneumatics? - Answer 3-15psi. 3-6-9-12-15 Intrinsic safety is? - Answer Barrier preventing excess voltage or current from reaching in hazardous area.