CWEA E1 Study Set 2023

Confined Space - correct answersA 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 - correct answersAn employer's written authorization to perform work capable of providing a source of ignition. Inerting - correct answersA 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 - correct answers19.5% to 23.5% Below 19.5=unsafe for breathing Above 23.5=explosive Leader Line - correct answersThe 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" - correct answersA 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) - correct answersElectric potential is equivalent to pressure and the voltage (or voltage drop/potential difference) is the difference in pressure between two points. Hydraulic Term: "Current" - correct answersEquivalent to a hydraulic volume flow rate; that is the volumetric quantity of flowing water over time. Ohm's Law - correct answersCurrent through a conductor between two points is directly proportional to the voltage across the two points. S.O.P. - correct answersStandard operating procedure. N.E.C. - correct answersNational Electrical Code. N.F.P.A. - correct answersNational Fire Protection Association NPT - correct answersNational pipe thread. Tapered pipe. Compound Gauge - correct answersDisplays negative AND positive pressure measurements Cat1 Meter - correct answersMeasures electronics Cat2 Meter - correct answersMeasures single-phase receptacles. Cat3 Meter - correct answersMeasures 3 phase distribution and single phase lighting equipment. Cat4 Meter - correct answersMeasures 3 phase at utility connection and any outdoor connections. L.O.T.O. - correct answersLock out tag out is an osha regulation. 3 elements needed to start a fire. - correct answersHeat, oxygen and fuel. Class C fire. - correct answersElectrical fire What is Rust - correct answersCombination of water, oxygen and iron. Micrometer Torque Wrench does what when setting is reached? - correct answersClicks. V.F.D. - correct answersVariable frequency drive used for AC motor speed in hertz. Bourdon Tube Gauge shape - correct answersC shaped. 1 PSI = ? feet of water. - correct answers2.31 Partial Flume - correct answersA 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. - correct answersYes, because of pressure difference. Hysteresis - correct answersInput ascending and descending Turbine Flow Meters provide what kind of signal? - correct answersProvide a frequency or pulse output signal What happens to wire resistance when temperature rises 10 degrees Celsius? - correct answersIt decreases 10%. Inductor - correct answersCoil of wire that opposes any change in current. Magnetic Flow Meters show what when the water is low in conductivity? - correct answers0 reading if the fluid is low in conductivity. "Empty Meter" Purple U.S.A. marking. - correct answersReclaimed water. Orange U.S.A. marking. - correct answersTelecommunication, alarm or signal lines conduit. Red U.S.A. marking. - correct answersElectric power lines, cables or conduit. What happens when a motor loses one phase out of 3? - correct answersSingle phasing will cause the motor to trip the overload heaters. What does a Pitot tube do? - correct answersMeasures velocity of low to medium gas flow applications. PH range? - correct answers0-14 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? - correct answersNo 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? - correct answers277 volts. Signal range for pneumatics? - correct answers3-15psi. 3-6-9-12-15 Intrinsic safety is? - correct answersBarrier preventing excess voltage or current from reaching in hazardous area. How do you add capacitors in series? - correct answersSame as resistors. How many paths in a parallel circuit? - correct answersMore than 1. Determined "Power Factor" formula. - correct answersPF=kw/kva If transformer primary=120v and secondary 12v=20 amps, what are the amps on the primary? - correct answers2 amps. Formula: I =Amps/Volume of current E = Volts/Force moving the current P = Watts, Electrical power produced I x E=P 12 x 20=240watts In a transformer watts stay the same so now: P/E=I 240/120v=2 amps How long before digging do you notify "dig alert"? - correct answers2 days. Dig Alert number? - correct answers811 What instrument do you use to measure 4-20 mA? - correct answersDC clamp meter. How do you connect an ammeter to check an electrical circuit? - correct answersIn series with the load. An electronic tachometer works by? - correct answersReceiving voltage pulses from and ignition signal. What do you do when the synchronize light goes out on 2 generators running in parallel? - correct answersClose the breaker. What are direct current motors designed for? - correct answersHigh torque and low inertia. What should insulation resistance be? - correct answersOne megaohm for each 1,000 volts of operating voltage with a minimum value of one megaohm. Prohibited discharges from industrial users to P.O.T.W.(publicly owned treatment works ) according to the Clean Water Act are pollutants that? - correct answersCreate a fire or explosion hazard in the sewer or P.O.T.W. A significant industrial user can be defined as? - correct answersA federal categorical industrial user. What type of measuring device can be installed in a pipe while allowing full flow? - correct answersVenturi meter. A white warning placard with the symbol "OX" would be placed on a tank containing what chemical? - correct answersHydrogen Peroxide The property of an electrical circuit that restricts the flow of current is? - correct answersResistance Why is communication important in confined space work? - correct answersVerifies that work is proceeding well and the situation is normal. What does the computer related term LAN stand for? - correct answersLocal area network. If you are angry or impatient with one worker you should? - correct answersAvoid transferring that feeling to others. First step in troubleshooting a programmable logic controller(PLC) system is? - correct answersUnderstanding how the system works. A signal of 4 to 20 MA is an example of a? - correct answersAnalog electrical signal. Dual-voltage motors are? - correct answersEither Wye(Y) or Delta connected. The National Electric Code defines a qualified person as? - correct answersSomeone who is familiar with equipment operation and hazards. Which kind of drawings use both normal and actual dimensions? - correct answersArchitectural Before releasing new equipment for operation, you should? - correct answersCheck the fuse and overload relays. The insulation in a capacitor is called? - correct answersDialectric. Which kinds of bearings are used when a motor is to be mounted horizontally? - correct answersRadial What is the main electrical danger when using power tools? - correct answersA short circuit What is the most important feature for adequate equipment grounding? - correct answersLow impedance path An explosion proof container can? - correct answersWithstand and contain an internal explosion. Shielding protects an analog meter from? - correct answersStray magnetic fields. The difference between a squirrel cage rotor and a wound cage rotor is? - correct answersHow the conductors are connected. The frame, core, winding and end plates are all parts of? - correct answersA stator.