USAF Electrical Power Production (AFSC 3E0X2) On-Site Power Module 2 Practice Test

These questions are part of the practice quiz. Start practicing

• Which component prevents oil pressure from rising too high by relieving excess pressure?
• When should gasket sealant be used?
• The MPU, crank positioning sensor and cam positioning sensor all perform what function?
• Which of the following practices helps ensure a proper gasket seal during installation?
• Which statement best describes the CPU in a PLC?
• Supplemental coolant additives are a water soluble chemical compound that protects metal surfaces of the cooling system against
• What is the purpose of a four stroke diesel engine?
• When would a fuel transfer pump be used?
• When does the intake event begin on a two-stroke diesel engine?
• Ladder Logic was invented to ease the transition from which technology?
• When would static grounding be utilized in an electrical system?
• What is the function of the intake valves?
• What is the primary purpose of performing an infrared scan on interior components of an AC system?
• If facility loads are not sufficient in bringing the generator to the required load level, then what should be done?
• Which component is used to mesh the starter gear with the engine flywheel?
• Which component is designed to hold extra coolant and maintain pressure during expansion?
• What is the purpose of installing engine heating devices?
• Which device supplies the battery’s starting energy?
• Which bonding option is typically used to span a gap between components without using a wire?
• The Air Force form 487 (Generator Operating Log) is used to
• Which component will be used to aid in a cold engine start? (Gas engine)
• A mechanical fuel pump is typically driven by which engine component?
• What supplies, fresh air to the airbox in a two-stroke diesel engine?
• What type of silencer is efficient at mitigating low to mid frequency noise only?
• Which selector determines the charging profile for different battery types?
• In a three-phase alternator, what is the angular separation between phase windings?
• What is the purpose of an oil filter?
• Which statement accurately describes the range of TDNE?
• Which statement correctly describes the load when the power factor meter indicates the left side?
• If possible, why should an infrared scan of inner equipment be accomplished on an AC system?
• What will occur after connecting the charger and not making a charging quick set selection within 10 minutes?
• How many degrees apart is each phase winding in a three-phase alternation positioned?
• Which type of memory stores data in a PLC to support processing?
• If generator voltage is not compatible with service voltage, what is likely outcome?
• If coolant comes into direct contact with the cylinder liner, which type of liner is used?
• Static grounding helps prevent sparks in flammable environments by preventing static discharge between ground and conductive surfaces. Which option best describes this effect?
• What bonding objective is to ensure equal potential of all metal parts within an electrical system?
• EPA standards may require what to be used?
• Which practice helps ensure proper alignment when starting fasteners?
• Which term describes the hardware unit that executes PLC logic and manages data?
• Which arrangement demonstrates a proper equipment grounding path involving a metal water pipe tied to the grounding system?
• What are PLC's replacing?
• What is the purpose of the flywheel?
• Which statement best describes a characteristic of the centrifugal water pump in the cooling system?
• When bonding electrical system components, which method is appropriate?
• Which component is most directly associated with removing heat from the engine oil?
• What function of the fuel system breaks up the fuel into smaller particles?
• Which term describes the process of breaking fuel into fine droplets for combustion?
• What is the purpose of a battery?
• Which ATS command begins generator operation?
• Electrical systems are grounded to prevent surges due to __________, line surges and unintentional contact with higher voltage lines?
• Which component provides volatile storage for processing and program data in a PLC?
• If left untreated, cavitation can cause what in a cooling system?
• If a gasoline engine lubricating system is showing low oil, pressure, which will NOT be the cause?
• Which statement accurately describes the CPU's role in a PLC?
• What is the purpose of the oil cooler?
• Which component describes a temporary protective layer applied when the surface coating has been damaged?
• In a PLC, which terminals are used to receive signals from sensors?
• Which grounding principle is defined below? Protects personnel from shock, electrocution, fire and explosion hazards by equalizing the potential between ground and any normally non-current carrying conductive materials.
• Which of these does not provide a form of fuel filtration?
• Which component provides the physical motion to move ATS contact assemblies between Source 1 and Source 2?
• Which liner type circulates coolant around the liner to remove heat?
• Which type of fuel lines are standard wire-braided hose with an inner lining?
• Which statement best describes the function of a gasket in engine assemblies?
• Which of the following is NOT a function of the oil cooler?
• Why are electronic governors used instead of mechanical?
• What should be done to prevent cross threading?
• If cooling air passes over intake air then this is a/an?
• In a two-stroke diesel engine, which component brings fresh air to the engine's intake area?
• What exciter component rotates and provides AC voltage to the rectifier components?
• Which component in the exciter system rotates and supplies AC voltage to rectifier components?
• Which component moves the contact assemblies between Source 1 and Source 2 (ATS)
• Why must the transfer switch have a switched neutral?
• Why are electrical systems and equipment grounded?
• What can 'knock'?
• Which of the following is NOT a reason for bonding equipment?
• Which grounding arrangement radiates wires horizontally from a central point?
• When the piston begins to travel downward in the cylinder, what occurs? (Gasoline engine)
• In a PLC, which terminals drive external devices like actuators?
• If current rises above amperage rating on a fuse link what will happen?
• Conventional antifreezes use what type of additives to achieve corrosion and scale protection?
• Which outcome is achieved by using conventional inorganic antifreezes?
• In order to supply a utility with a certain amount of power, the ECU must be set to what?
• How many complete revolutions of the crankshaft are required for a two-stroke engine?
• Which coolant pre-heating method functions strictly off onboard battery voltage?
• When fuel is mixed with air and ignited by an electric spark from the ignition system, what occurs?
• Which event marks the start of exhaust in the piston cycle?
• What is the temporary protection used when coating system damaged?
• What is used to determine if the correct amount of coolant additives exist within a cooling system?
• What is used as an electrolyte solution in a lead-acid battery?
• Which component protection method is typically resettable after a fault occurs?
• Which programming method was invented to ease the transition for technicians programming PLCs while replacing mechanical relay logic systems?
• Why are static grounds used in power systems?
• Which component uses low amperage to operate a high amperage component?
• Which component hosts the PLC logic, memory, and communications?
• In a diesel exhaust aftertreatment using DEF with SCR catalyst, which species are produced as a result of the reaction?
• Which component stabilizes oil pressure at all speeds?
• Which category of fuel lines is typically used for medium-weight lines in standard wire-braided hoses?
• Which coolant pre-heating method operates strictly off onboard battery voltage?
• Which mechanical removal technique is used to remove light corrosion without deep pits?
• What is the purpose of a gasket?
• What will cause a generator to wet stack?
• When the pressure in the cooling system exceeds the maximum value, what does the radiator cap do?
• In a PLC, which component handles processing of instructions?
• Which method of air preheating functions strictly off onboard battery voltage?
• What happens when current exceeds the fuse rating in a fuse link?
• Which is a major advantage of a diesel engine over gas engines?
• Which component engages the pinion gear?
• Which protective device provides a time delay and must be replaced when actuated?
• For a system to be considered grounded it must
• During the intake phase of a gasoline engine, what causes the air-fuel mixture to enter the cylinder?
• Which statement best describes Ladder Logic in PLC programming?
• Which of these will cause a loss of coolant?
• What is a key benefit of using a thermal-magnetic circuit breaker?
• The sensor signal must be converted to which form before the engine control unit can interpret it?
• Seals are comprised of what material type?
• In order for the facility load to operate properly the generator and transfer switch must do what?
• What is a weakness of the direct immersion (coolant type) pre-heating device?
• What is the primary energy transformation when a lead-acid battery delivers power to a load?
• If voltage output goes to zero, what will happen to the volt meter?
• Upon starting the engine, check for excessive smoke. Why?
• If a transformer uses two inductors, then it is said to be what kind of transformer?
• What is the typical effect of grounding during fault conditions?
• Which type of battery uses fine, highly porous microfiber glass separators to absorb the electrolyte?
• Why would a piece of equipment be equipped with a thermal-magnetic circuit breaker?
• What will happen if the generator's voltage is incompatible with the electrical service?
• If a circuit has higher amperage or volt ratings, then what type of fuse will be used?
• What is the purpose of the oil filter?
• How long is the Time Delay Normal to Emergency (TDNE) adjustable for?
• What type of corrosion occurs when two different metals contact each other with moisture?
• Which element in a PLC is specifically used to send signals to external devices?
• What term describes the piston being at its highest position in the cylinder?
• Which fuse type is suitable for higher amperage or voltage ratings?
• Which air preheating method is powered by onboard battery voltage?
• Which term best describes an air cleaner that uses two filtration elements in series?
• Which component houses the microprocessor controlling ATS functions?
• Which ATS command is used to start the generator?
• Which function of an electronic governing system comes after sensing?
• If the cylinder head forms the top of the combustion chamber, which component forms the bottom of the combustion chamber?
• The centrifugal water pump draws coolant into the center of the impeller and then what?
• If the Automatic Voltage Regulator computed a positive error signal, how would that affect the stator's output voltage?
• Which term best describes delivering a controlled amount of fuel to the engine?
• What happens to air velocity when it passes over the fins of air cooled engines?
• Which of the following is not a grounding method mentioned in the material?
• What capability does the battery have?
• After the battery has completed charging, the battery charger will enter which mode of operation?
• Which bonding method is typically used to join components at a distance using a hot chemical reaction?
• What bonding equipment utilizes rigid plates that can be used to span a gap to connect two or more components of an electrical system?
• What is the primary purpose of the additive used in coolant filters?
• Which fuel injection system is designed for applications with relatively broad speed requirements?
• Which component houses a microprocessor that controls all ATS functions?
• What component moves oil from the oil pan and delivers it throughout the engine?
• Which component forms the bottom boundary of the combustion chamber when the cylinder head forms the top boundary?
• Which alternator component helps to maintain stable voltage during load changes?
• Which PLC language is most commonly associated with ladder diagrams?
• What is a common cause of a high temperature coolant system malfunction?
• Which statement best describes the role of coolant additives?
• How is power supplied to single unit PLC's?
• Which component allows the user to select the battery pre-charge status?
• Which component uses a low-amperage signal to energize a high-amperage circuit in the starting system?
• Which of the following is the best example of an equipment ground?
• Which of the following does NOT need to be known to complete a load survey?
• What is the end product if DEF is used in conjunction with an SCR Catalyst in a diesel exhaust system?
• Which term describes the act of burning the air-fuel mixture in the engine?
• Specific gravity of a battery is influenced by which two factors?
• If the piston reaches its upper limit of travel, what is it called?
• What type of valves are located in the overhead valve train of a two-stroke diesel engine?
• Which PLC programming approach is designed to resemble ladder diagrams?
• Star grounding is characterized by which description?
• Electronic governors are preferred because they are easier to tune and change pre-selected speeds, compared with mechanical governors. Which statement best describes this?
• What bonding method is used to connect components separated by distance and can be solid, stranded, braided, bare or insulated?
• Which component is used to set the required charging profile depending on battery type?
• Which mechanical removal type uses abrasive paper to remove light corrosion, not deeply pitted into metal?
• What air cleaner has air travel through two filters before entering the intake piping?
• Which cleaning removal type combines mechanical force from spray with the reactions of the chemicals used in the solutions?
• A mechanical fuel pump is actuated by what?
• Which lubrication component is primarily used to remove heat from the engine oil?