Skilled Trades Practice test Please wait... 1. Fixture shut-off valves allow?Regulate water pressureIncrease water flowFilter debrisIsolated repairs 2. What does SCADA do in plants?Removes sludge Adds chemicals Filters water Monitors and controls systems 3. What device is commonly used to verify phase rotation on 3-phase systems?Phase rotation meterTone generatorMeggerClamp meter 4. What is the purpose of a fuse?Improve efficiency Increase voltage Control airflow Protect against overcurrent 5. What is the purpose of equipotential bonding around pools?Reduce shock hazardsImprove lighting brightnessIncrease chlorine efficiencyReduce conduit corrosion only 6. You measure 20 mA at the controller, but the valve is closed. What is the MOST likely issue?Bad sensor Low refrigerant Faulty actuator or mechanical failure Dirty coil 7. Which meter setting is used to check continuity?AC current clamp onlyHertz modeResistance or continuity modeCapacitance only 8. A loose blower belt will cause:Higher voltage Increased refrigerant flow Increased airflow Reduced airflow 9. What does a 3–15 PSI signal represent?Airflow measurement Refrigerant pressure Electrical signal Pneumatic control signal 10. What is the approximate phase-to-phase voltage in a 208Y/120V system?208 volts120 volts480 volts277 volts Loading...
