Skilled Trades Practice test Please wait... 1. What does MLSS stand for?Microbial Load Settling System Maximum Liquid Solid Separation Mixed Liquor Suspended Solids Mixed Level Sludge System 2. What is a weir used for?Measure pH Remove sludge Control water flow Add oxygen 3. What is the purpose of a coordination study in electrical systems?Reduce conduit fillIncrease transformer efficiencyEliminate grounding conductorsEnsure selective overcurrent protection 4. Why are selective coordination requirements critical in emergency systems?Lower breaker ratingsMaintain critical power continuityIncrease fault currentReduce transformer sizes 5. What is static pressure in an HVAC system?Electrical resistance Resistance to airflow in ductwork Moving air pressure Refrigerant pressure 6. Why are neutral conductors important in wye systems?Provide phase-to-neutral voltageReduce grounding onlyEliminate fault currentIncrease transformer size 7. Which refrigerant is considered high-pressure refrigerant?R-410a R-11 R-113R-123 8. What is a common cause of low pH?Acidic influent High alkalinity High DO Low flow 9. If alkalinity is too low, what process is most affected?Screening Nitrification Filtration Sedimentation 10. What can happen if neutral and ground are bonded downstream of the main service?Objectionable current flowReduced voltage dropBetter breaker performanceLower resistance only Loading...
