Wastewater Treatment Class I Questions and Answers Already Graded A+ (2024/2025)

Wastewater Treatment Class I Questions and Answers Already Graded A+ (2024/2025) The first step the maintenance staff should take in properly locking and tagging out a piece of equipment is to... a) alert the operator on duty b) turn the equipment off at the motor control center (MCC) c) pull the switch on the electrical panel to "OFF" d) fill out the tags a) alert the operator on duty Always alert the operator on duty before shutting down any equipment so as to prevent the possibility of harming personnel or affecting process performance as a result of the shutdown. When working in an area with two or more floor coverings, be sure that they are always... Wastewater Treatment Class I Questions and Answers Already Graded A+ (2024/2025) a) overlapping one another b) secured together c) separated from one another d) at the entrances and exits only b) secured together If two or more floor coverings are required, secure them together to prevent trips and falls from the coverings separating. When manually lifting any object, be sure to... a) hold it at arm's length b) keep your back bent and hold it low c) keep it close to your body and use leg strength d) keep your knees locked and bend at the waist c) keep it close to your body and use leg strength When lifting any object manually, use your legs and keep the object close to to your body in order to minimize the risk of back injury. Oxygen deficiency becomes a concern when the oxygen level in a confined space is less than... a) 19.5% b) 22.5% c) 25.5% d) 28.5% a) 19.5% The quality of air in a confined space is of utmost importance. Ambient air contains approximately 21% oxygen and atmospheres with oxygen concentrations below 19.5% are considered unsuitable for occupancy. Levels below 19.5% can lead to injury, loss of consciousness or death. Which of the following provides safety information for potentially hazardous or toxic materials? a) CERCLA b) OSHA c) CFR d) MSDS d) MSDS Material Safety Data Sheets provide information on chemical hazards, and health, safety and environmental concerns of chemicals. Conventional activated sludge systems typically operate with a DO range of... a) 0-1 mg/L b) 2-5 mg/L c) 4-7 mg/L d) 7-9 mg/L b) 2-5 mg/L While many facilities operate in a range of 1-4 mg/L, the optimum range of DO for a conventional activated sludge facility is 2-5 mg/L Large debris (sticks, rocks, etc), large floating solids, and fibrous materials (rags, strings, cloths, etc.) are categorized as... a) screenings b) scum c) grit d) floc a) screenings Large debris, large floating solid material, and fibrous material are categorized as screenings. It is necessary to remove this material before the wastewater reaches any pumps or equipment in order to prevent damage. Pumps are often required to bring wastewater into a treatment plant. What types of pumps are typically used to lift influent wastewater? a) air-lift b) centrifugal c) positive displacement d) progressing cavity b) centrifugal Centrifugal pumps are primarily used for transporting influent and effluent wastewater. Positivedisplacement pumps, such as a progressing cavity pump, are used to transport sludge. The time it takes for a unit volume of wastewater to pass entirely through a primary clarifier is called... a) detention time b) hydraulic loading rate