ABC Class 1 Physical/Chemical Operator Practice Exam

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• Which of the following is a primary component in a control valve's operation?
• What type of energy transfer process is primarily involved in thermal expansion?
• Which of the following is not a trait of a confined space?
• Which of the following is an example of a base?
• In a disinfection unit, the chlorine flow rate is set by?
• What is one property of alloys compared to their constituent metals?
• A tank has a liquid level of 18 feet and a diameter of 9 feet. What is the volume of the liquid?
• Name one common method of heat transfer in industrial processes.
• Which of the following is an example of a physical change?
• What will happen if packing is leaking excessively?
• What is the purpose of the shear pin on a clarifier shaft?
• What would be the best flowmeter to use to measure the flow of a waste stream containing scum and sludge?
• In the context of solutions, what does “saturation” mean?
• What is the purpose of locking out an electrical motor during maintenance?
• What is the volume of a tank in gallons with a 7 foot diameter and 17 feet tall?
• When configuring a centrifugal pump, what is crucial for proper packing installation?
• To calculate feed rate, you need to know:
• Care should be exercised when handling polymers because they:
• What is entropy in the context of chemical systems?
• What is the purpose of the influent baffle at the entrance of a clarifier?
• Which of the following is a standard measure of density?
• Define the term 'solvent'.
• In chemical safety, what is a “lockout/tagout” procedure?
• Special care should be taken to prevent alum from getting damp because:
• What does the term "chemical equilibrium" refer to in chemical reactions?
• What effect will the addition of alum have on the pH of wastewater?
• In chemical processing, what does the term "stoichiometry" refer to?
• Why is pH control in hydroxide precipitation important?
• Which of the following is an advantage of mechanical seals over packing for centrifugal pumps?
• Why is it essential to monitor temperature in chemical processes?
• Which of the following processes would benefit from emulsification?
• What does the term 'stoichiometry' refer to?
• Which is the best method for obtaining representative samples?
• Why are alloys often used in construction and manufacturing?
• What does the term "mass transfer" refer to in chemical processes?
• How does the presence of a catalyst affect activation energy?
• What is molar mass?
• What is the boiling point of a liquid related to?
• What is the primary function of a catalyst in a chemical reaction?
• What occurs to reaction rates as temperature increases in most chemical processes?
• What is the volume of a tank 24 feet long, 16 feet wide and 8 feet deep?
• Why is rubber piping used to transport lime slurry?
• What is the primary purpose of a physical/chemical operator?
• What happens to equilibrium when a change in concentration occurs?
• What is the most important rule when operating a positive displacement pump?
• If a dosage rate is given in mg/L, what does mg represent?
• What does "specific gravity" refer to in chemistry?
• When entering a manhole, you should test for an explosive atmosphere:
• During which process is a new substance formed?
• What is a possible consequence of thermal expansion?
• Which is not a proper alternative for treatment of industrial wastewater?
• What is the main function of a control system in an industrial process?
• How can you determine the concentration of a solution?
• Which principle is essential for the safety of chemical processes?
• What is the chemical feed rate to obtain a 4 mg/L dose in a 5 MGD flow?
• Which of the following could be a physical change involving water?
• What is the most important factor in a continuous backwash, upflow, deep bed media filter?
• What does an increase in temperature generally do to vapor pressure?
• To fully complete a titration, what must be achieved?
• What distinguishes organic chemistry from inorganic chemistry?
• What is an acid defined as in chemistry?
• What is the main function of catalysts in chemical reactions?
• Which chemical is commonly used for disinfection in wastewater treatment?
• What is the purpose of a Safety Data Sheet (SDS)?
• What is classified as an electrolyte?
• What is the detention time of a 3 million gallon settling basin, with 8,000 gallons per hour wastewater flow?
• What is the purpose of a weir plate in a settling tank?
• In the context of matter, which of the following is NOT considered a phase?
• What is the purpose of the lantern ring when packing a centrifugal pump?
• What does "flow rate" indicate in a chemical process?
• In the context of process safety, what do the initials PHA stand for?
• Which of the following represents a combination of two elements, at least one of which must be a metal?
• What safety precautions should be taken when handling chemicals?
• What does the ideal gas law (PV = nRT) express about gas behavior?
• Which formula represents the ideal gas law?
• What occurs during a combustion reaction?
• What is an alloy?
• What property distinguishes a chemical change from a physical change?
• What separates mixtures based on differences in boiling points?
• What is the primary characteristic of a chemical change?
• What is an example of a physical change?
• The only solids dewatering unit to operate under constant high compression is:
• What is the function of a buffer in a chemical solution?
• If an operator has refused to follow safety procedures for years because he believes they do more harm than good, you should:
• What is an exothermic reaction?
• What is the purpose of a doctor blade on a rotating screen?
• When utilizing calcium hypochlorite for disinfection, it should be used:
• What does polarity in chemistry refer to?
• What is an example of a chemical change?
• What kind of reaction takes place when a catalyst is used?
• Cyanide destruction should not be done in the presence of which substance?
• What is the only chemical commonly used in slurry form to improve settling of solids?
• The addition of caustic soda to remove metals from waste stream is known as?
• The best method of selecting chemicals and determining doses is:
• Which of the choices correctly describes the role of temperature in chemical reactions?
• What is the typical flow rate for a standard small wastewater treatment plant?
• What is the primary difference between a physical change and a chemical change?
• What is the primary purpose of a settling tank in wastewater treatment?
• Which of the following best illustrates 1 ppm?
• What does the term "surface tension" refer to in liquids?
• How does pressure influence the boiling point of a liquid?
• Which of the following best describes a metal alloy?
• If the pH of a waste stream goes down, the concentration of hydrogen ions [H+]
• A settling tank utilizes which step of waste treatment?
• What is the final process in cyanide destruction?
• Which type of reaction involves the breaking down of substances?
• Which of the following is NOT an example of an alloy?
• What is the critical role of disinfection in water treatment?
• What does OSHA stand for in the context of workplace safety?
• What is meant by the influent for a wastewater treatment plant?
• What is the chemical feed rate to obtain a 12 mg/L dose in a 4 MGD wastewater flow?
• Which of the following factors does NOT affect the rate of a chemical reaction?
• What does a titration curve represent?
• What information can be obtained from a chain-of-custody?
• What does the term “volatile” refer to in chemical terminology?
• Which best describes flocculation?
• What characterizes a saturated solution?
• How is molar mass typically expressed?
• What does the term "corrosive" mean in relation to chemicals?
• What effect does hydrated lime have on the alkalinity of wastewater?
• In a chemical equation, what is the purpose of the coefficients?
• Greases and oil can be removed from a wastewater stream by:
• Describe what a "sump" is in industrial settings.
• What does “throttle” mean in terms of valve operation?
• What method is commonly used to remove metals from wastewater?
• Which measurement unit is commonly used to express pressure in industrial applications?
• What constitutes a hazardous spill?
• What is the primary role of a disinfection unit in wastewater treatment?
• What is defined as a process where reactants are transformed into products through breaking and forming chemical bonds?
• What is vapor pressure?
• Which of the following defines "leak detection" in chemical processes?
• How do electrons contribute to chemical bonding?
• What is the purpose of using inert gases in chemical processes?
• What is the detention time of a 2 million gallon settling basin with a 10,000 gallon/hour water flow?
• What can be a potential advantage of using bronze over pure copper?
• What process is mainly utilized to convert crude oil into gasoline?
• What is chromatography primarily used for?
• What are azeotropes in the context of mixtures?
• What is a potential hazard when performing sulfide precipitation?
• What is the volume of a cylindrical tank with an 8 foot diameter and 12 feet tall?
• Which is an example of an alloy?
• Which statement accurately describes a physical change?
• Which best describes coagulation?
• How is pH typically measured?
• Install packing on a centrifugal pump so the lantern ring is:
• What principle does chromatography rely on?
• How can the formation of a precipitate indicate a chemical reaction?
• What is the main purpose of distillation in chemical processing?
• What does "thermal expansion" describe?
• What is the definition of "titration" in chemistry?
• Which of the following best describes an exothermic reaction?
• Which of the following is a sign that a chemical reaction has occurred?
• What is the purpose of the discharge check valve on a centrifugal pump?
• Packing should be replaced when:
• What term describes the separation of a suspension of particles into a clarified liquid and a concentrated suspension?
• Calculate the detention time of wastewater flowing at 20 gpm through a 1600 gallon clarifier.
• What does pH measure?
• What can be a consequence of failing to regulate operating conditions in an industrial process?
• What is the significance of understanding exothermic reactions in chemical processes?
• What is a precipitate?
• What does MSDS stand for?
• A treatment plant uses chlorination for disinfection of their wastewater. Based on the following chart of chlorine use in lbs, what is the average chlorine dose?
• What is an important factor in determining the efficiency of a wastewater treatment process?
• What is the goal of hydroxide precipitation in wastewater treatment?
• What does "emulsification" refer to in chemical processes?
• What is the primary reason for combining metals to create an alloy?
• Which chemical is most commonly used to neutralize acidic waste streams?
• What characterizes a batch process in chemical production?
• With a concrete processing plant, the most likely type of wastewater contamination is:
• What is the chemical feed rate to obtain a 5 mg/L additive dose in a 5 million gallon per day wastewater flow?
• In a centrifugal pump, which part is primarily responsible for conveying liquid?
• Which of these components is commonly found in steel, an example of an alloy?
• What is the primary purpose of a heat exchanger?
• Where should an SCBA be stored for use in a chlorination facility?
• In a chemical reaction, what is the definition of a reactant?
• What is the detention time for a 400 gal mixing tank with a water flow of 15 pounds per minute?
• Which of the following is a common type of control system used in industrial processes?
• What type of extinguisher would you use on a gasoline fire?
• Which characteristic of a proton distinguishes it from an electron?
• What does the process of filtration accomplish?
• What does it mean if a chemical reaction reaches completion?
• What is the proper way to align packing rings on a centrifugal pump?
• How is molarity calculated in a solution?
• How is an endothermic reaction characterized?
• Which of the following best describes a physical change?
• What is the purpose of the packing gland?
• What does 'activation energy' refer to?
• What is the purpose of dewatering sludge?
• How is the concept of solubility defined?
• Which is a common physical property of liquids?
• How would you calculate the volume of liquid in a tank with a diameter of 27 feet and a liquid level of 8 feet?
• What is the best means to prevent contamination of drinking water supply with plant water?
• Which type of contaminants is primarily produced by an electroplating plant?
• What is the primary function of a pressure relief valve?
• What is a pneumatic system?
• What is the main function of a scrubber in emissions control?
• What is the best way to store a 150# chlorine gas cylinder?
• What is the area of a concrete pad that is 16 feet long, 8 feet wide, and 6 inches thick?
• What is the primary importance of personal protective equipment (PPE)?
• What does the term “equilibrium” signify in chemistry?
• How tight should the packing gland be?
• Which stage of waste treatment is primarily concerned with the removal of larger solids?
• What is meant by the effluent for a wastewater treatment plant?
• The process of adding bleach to wastewater for disinfection is known as?
• A waste line has a flow rate of 200 gallons per minute. What is the daily total flow for this line?
• When removing packing, you should:
• What type of valve is commonly used for regulating flow in a pipeline?
• What two elements combine to form bronze?
• Which factor does not affect vapor pressure?
• What is defined as a unit that measures the amount of substance in chemistry?
• What does sublimation refer to in terms of phase transition?
• Which of the following are types of shaft misalignment?
• Which type of reaction occurs when an acid reacts with a base?
• Which of the following are common units for flow rate?
• What is formed when two atoms share one or more pairs of electrons?
• What measurement unit is often used to express the concentration of pollutants in water?
• What does "scalping" refer to in chemical processes?
• What is the primary unit for measuring concentration in a solution?
• What is the effect of catalysts on chemical reactions?
• Explain Le Chatelier's Principle.
• What is the common usage of alloys in industry?
• What is a common application of chlorine in water treatment?
• What does dynamic equilibrium indicate in chemical reactions?
• In a chemical reaction, the term "activation energy" refers to?
• Which of the following best describes specific gravity?
• If the water level in a tank is raised 9 inches, how much does the bottom head pressure increase?
• What is the difference between a strong acid and a weak acid?
• The typical pH of wastewater leaving an IWTS:
• What does the law of conservation of mass state?
• What are the three phases of matter?
• How does the presence of tin in bronze affect its properties?
• What is the main goal of titration in chemistry?
• What type of bond is formed by the electrostatic attraction between oppositely charged ions?
• Which symbol typically indicates an acid on a chemical label?
• How tight should you tighten the packing gland on a centrifugal pump?
• What distinguishes endothermic reactions from exothermic reactions?
• What does a high specific heat capacity indicate about a substance?
• What is meant by "ambient temperature" in a laboratory setting?
• Which of the following would not be effective at lowering the pH of wastewater?
• Which of the following would not be considered a reactant in a chemical reaction?
• If you have a flow rate of 1 cubic foot per second, how much will flow in 2 minutes?
• Which statement accurately describes the difference between an electron and a proton?
• Chlorine is:
• How much does a cubic foot of water weigh?
• How is surface tension significant in biological systems?
• What symbol is often used to indicate fire hazards on labeling?
• What defines a solution in chemistry?
• Which of the following would not be effective at raising the pH of wastewater?
• What happens when sulfide precipitation is conducted with an acidic waste stream?
• In a saturated solution, what occurs when more solute is added?
• What is the main component found in natural gas?
• What is the spiral-shaped casing that surrounds a pump and collects the discharge?
• If a wastewater treatment staff reaches a consensus, they:
• What equipment is commonly used to measure flow rates in pipelines?
• What does “thermal conductivity” measure?
• Name a common detector used in gas monitoring.
• In chemical formulas, what does the subscript indicate?
• Why is personal protective equipment (PPE) essential in chemical handling?