AVM 249 Fuel Systems Test 1 Practice Test

These questions are part of the practice quiz. Start practicing

• What does priming a fuel system involve and when is it performed?
• Which statement about vent system operation is true?
• Which statement best describes the effect of fuel temperature on system performance?
• Which component provides backup or priming assistance for fuel delivery?
• What minimum markings must be placed near each appropriate fuel filler cover for reciprocating-engine airplanes?
• Vent lines in aircraft fuel systems primarily serve to
• Which of the following is NOT typically a cause of fuel leaks around fuel lines and fittings?
• What capability must the fuel jettison valve have during flight?
• What markings must be placed on or near each appropriate fuel filler cover on standard category aircraft?
• What is the purpose of a cross-feed valve in a multi-tank fuel system?
• Why are centrifugal-type boost pumps used in fuel systems of aircraft operating at high altitude?
• What should you do if water is present in the separator drain?
• One purpose of a fuel tank vent is
• What feature on the filter assembly helps indicate the presence of water in the fuel?
• In a bench pump test, which measurements confirm proper operation?
• Which marking is required on or near the fuel filler cover for standard category aircraft?
• Microbial growth is produced by various forms of micro-organism that live and multiply in the water interfaces of jet fuels. Which of the following could result if microbial growth exists in a jet fuel tank?
• Recognize and diagnose a 'low fuel pressure' warning on a jet engine with a dual-pump system.
• What is the recommended approach to leak testing around injector lines?
• Which statement about integral fuel tanks in large aircraft is true?
• Define fuel icing and describe typical mitigation methods in modern aircraft.
• What is the purpose of a fuel metering unit in a piston engine with electronic fuel injection?
• What is the primary function of the fuel baffle plate in preventing surging?
• Which measures prevent varnish or gum buildup in a fuel system?
• How may the antiknock characteristics of a fuel be improved?
• Why is keeping the fuel filter clean critical for engine performance?
• Which component helps prevent fuel from moving away from the boost pump during high-G maneuvers?
• What is a back-leak in a fuel pressure regulator and how does it affect performance?
• Which component is most directly responsible for delivering fuel to the engine at sufficient pressure for starting when the engine-driven pump is not yet running?
• What would be the result if the crossfeed valve is not properly locked?
• Flapper valves are used in fuel tanks to
• In a gravity-fed system, what provides the force to move fuel to the engine?
• An aircraft's integral fuel tank is
• Which statement describes turbine fuels in relation to microbial contamination?
• Outline the standard procedure for performing a fuel system pressure test.
• Which of the following correctly matches three common fuel contaminants with their effects?
• What is inerting in aircraft fuel tanks and when is it implemented?
• What is the difference between a fuel tank and a fuel cell in aircraft fuel systems?
• Why is a water separator placed upstream of the engine fuel control in many systems?
• Fuel baffles in aircraft fuel tanks are used to prevent ______ caused by changes in the attitude of the aircraft.
• What is one disadvantage of using aromatic aviation fuels?
• What is the primary purpose of venting all aircraft fuel tanks?
• Flapper valves in fuel tanks serve as what type of valve?
• Outline the steps taken to prevent static electricity hazards during fuel system maintenance.
• Which test verifies the integrity of an aircraft fuel line after maintenance?
• Normal crossfeed operation in multiengine aircraft provides a means to maintain what condition?
• What is the function of a shutoff valve in a fuel system and when is it used?
• Which statement correctly compares capacitance-type and float-type fuel quantity probes?
• How does a fuel jettison system work and when is it used?
• During maintenance of a fuel system, which safety practice reduces static discharge risk?
• In the pumped fuel flow path, what is the role of the regulator/filter?
• How are vents arranged to reduce the risk of simultaneous plugging in multiengine fuel systems?
• During a pressure test, what sign indicates a leak around fittings?
• How would you verify the accuracy of a fuel quantity probe during maintenance?
• Explain what a valve lockout or valve interlock is and why it is used on fuel systems.
• How many vents must be used in multiengine fuel systems to avoid plugging at the same time?
• What does venting of fuel tanks primarily help to prevent?
• A typical large transport aircraft fuel manifold system allows which of the following?
• When an aircraft is fueled from a truck or fuel farm that has not been contaminated, daily draining of strainers and sump is combined with periodic filter changes and inspections to ensure fuel is contaminant free.
• Which statement is true regarding microbial growth in jet fuel tanks?
• What is an anti-siphon valve and what purpose does it serve?
• What is the purpose of a fuel jettison system and when would it be used?
• Which statement correctly describes AVGAS labeling for reciprocating-engine airplanes?
• How can you check a fuel pump's operation without starting the engine?
• Which of the following is not a function of the fuel pressure regulator?
• Which steps are used to diagnose a ground fuel leak?
• How is a crossfeed valve confirmed to be closed and properly locked in cockpit and valve housing?
• Select one means of controlling the fuel temperature on turbine-powered aircraft.
• In a pumped fuel system with an electric boost pump, which is the correct flow sequence from tank to engine?
• What safety steps are essential when working on an aircraft fuel system on the ground?
• The primary purpose of a fuel tank sump is to provide a place for contaminates and water to settle, with a drain valve to remove the impurities.
• What term describes microbial growth that can contaminate fuel?
• What are common symptoms of a failing crossfeed valve?
• How do electric boost pumps interact with engine-driven pumps in a dual-pump arrangement?
• What precautions must be observed if a gravity-feed fuel system is permitted to supply fuel to an engine from more than one tank at a time?
• Vapor pressure of aviation gasoline primarily affects
• Which component is designed to filter particulates and remove water from fuel just before entering the engine?
• When tanks are vented, the primary safety-related effect is
• Describe the procedure to replace a clogged fuel filter in a typical aviation fuel system.
• Which statement best describes the relationship between the fuel control unit and other systems?
• When a gravity-feed system is allowed to supply fuel from more than one tank, what must be true?
• Many fuel tanks incorporate ______ valves to prevent fuel from flowing away from the boost pump or tank outlet when the aircraft is in a high 'G' maneuver.
• Which of the following are common causes for incorrect fuel flow readings on a turbine aircraft?
• Fuel heaters are used with turbine engine fuel systems to prevent _________ in the fuel from clogging system filters.
• In a dual-pump system, what is the purpose of the selector that switches between the boost pump and the engine-driven pump?
• How can altitude changes affect fuel system operation?
• What is the function of an end-of-line filter?
• How do aircraft detect and indicate a fuel imbalance to the crew?
• Why is a primary filter/water separator installed ahead of the engine fuel control, and what is indicated by a high differential pressure across it?
• When installing a rigid fuel line, 1/2 inch in diameter, at what intervals should the line be supported?
• Fuel icing occurs when moisture is present in fuel at low temperatures. What is a typical preventive measure?
• Why should sumps be drained before maintenance?
• Which consequence is most likely if a fuel water separator is blocked or failed?
• Which component is primarily used to balance fuel between left and right wing tanks or supply an engine from an alternate tank?
• What is the general purpose of fuel jettison discharge?
• When performing ground maintenance on the fuel system, what is the reason to relieve pressure before beginning work?
• If a sealed fuel tank is not properly vented, what problem can occur?
• Why is priming a fuel system important, and when is priming required?
• Which statement is true about aviation gasoline vapor pressure compared to automotive gasoline?
• Why is it necessary to vent all aircraft fuel tanks?
• Why is a dry-out performed after draining water from the system?
• Which of the following must be visible near the fuel filler cover for standard category aircraft?
• What is a common symptom of an air leak in the suction line feeding a fuel pump?
• During injector-line leak testing, what observation indicates a leak?
• What is the primary purpose of a aircraft's fuel jettison system?
• During preflight checks, how can you verify pump operation?
• What is the purpose of a fuel/oil separator or filter in modern fuel systems?
• If fuel tank venting is neglected, which consequence is most likely?
• Which instrument most directly alerts crew to icing risk in turbine fuel systems?
• What is fuel starvation, and what commonly causes it?
• If the fuel pressure regulator fails, what is the most likely effect on fuel pressure?
• Which capability is provided by a typical fuel manifold system in a large aircraft?
• What maintenance action is described as being performed daily when refueling from a clean source to ensure fuel remains contaminant-free?
• What steps would you take if you observe a drop in fuel pressure with no engine indication of flow?
• The crossfeed system allows any tank to supply any engine. This statement is true.
• What describes a fuel cell in aircraft fuel systems?
• Entrained water in aviation turbine fuel is a hazard because of its susceptibility to freezing as it passes through the filters. What are common methods of preventing this hazard?
• What is the primary purpose of the crossfeed system?
• What is the purpose of a drain valve on a tank sump?
• Which component measures left and right tank levels to detect imbalance?
• Which of the following is a typical mitigation method for fuel icing in modern aircraft?
• How is fuel system anti-ice integrated and what are typical control parameters?
• When and why would you use a crossfeed in an aircraft fuel system?
• What safety step involves grounding and bonding the aircraft during maintenance?
• What is the primary function of an electric boost pump in a typical aircraft fuel system?
• In diagnosing a no-fuel-pressure condition with a boost pump and an engine-driven pump, what is typically done after verifying power and switching?
• Why is it important to isolate sections of the fuel system during a leak test?
• In some turbine-powered aircraft, where is the fuel temperature indicator located to monitor the fuel temperature during high altitude flight?
• During a fuel system pressure test, which areas should be included in the leak test?
• Which statement about boost pumps is true?
• What are the roles of primary and secondary fuel pumps?
• If water is observed at the bottom of a drain during a drain check, what does it indicate?
• How can a maintenance technician identify water contamination during a fuel sample test?
• What steps are involved in obtaining a proper fuel sample from an aircraft drain point?
• What property of jet fuel primarily explains its greater susceptibility to water contamination compared with aviation gasoline?
• What signal does a typical low-fuel warning use and where does it go?
• What is the role of the boost pump in most aircraft fuel systems?
• What is the purpose of draining the fuel/water separator and what do you look for?
• Compare a float-type fuel quantity indicator with a capacitance-type indicator.
• How would you troubleshoot a crossfeed indicator that shows an incorrect status?
• A fuel pressure warning switch contacts close and warning light is turned on when.
• What is the difference between vented and sealed fuel tanks, and why venting exists?
• What method is used on turbine-powered aircraft to determine when the condition of the fuel is approaching the danger of forming ice crystals?
• How is fuel temperature monitored and why is temperature control important?
• Which statement is NOT a valid reason to prime the fuel system?
• Which of the following may be used for the repair of fuel leaks on most integral fuel tanks?
• What component typically provides the low-fuel warning signal?
• How do variations in fuel density affect fuel management and crossfeed balancing?
• Under what conditions is microbial contamination of fuel most likely to occur?
• What action should be taken if you suspect a clogged primary filter due to high differential pressure?
• What is the purpose of drain valves on fuel lines and what would you expect to observe during a drain check?
• What is the purpose of crossfeed balancing?
• Why is it important to bleed air after replacing a fuel filter?
• Which of the following statements about fuel quality before the FCU is true?
• How does a gravity-fed fuel system differ from a pumped fuel system?
• Which component helps prevent backflow from the boost pump in an integral fuel tank?
• In an injected engine, how does the fuel/air control unit regulate fuel flow?
• How do fuel pressure gauges differ from fuel flow gauges?
• Which regulations cover the requirements of fuel jettisoning?
• Why is isolating fuel tanks during maintenance important?
• Which action is effective in eliminating or minimizing microbial growth in aircraft jet fuel tanks?
• What is the typical control logic for an electric boost pump during engine start?
• What does a low-level warning in the cockpit typically indicate regarding fuel management?
• Which components are commonly associated with fuel contamination?
• Which weight condition triggers the use of a fuel jettison system?
• Which of the following statements is true? A fuel heater can use engine lubricating oil as a source of heat.
• What is the primary role of the fuel control unit (FCU) in a turbine engine?
• List typical preflight checks for the aircraft fuel system.
• Fuel system components must be bonded and grounded in order to drain off static charges.
• How is water in aviation fuel typically removed from the system?
• How do you interpret a rising differential pressure across a primary fuel filter and what actions should be taken?
• What is the purpose of fuel boost pumps in aircraft fuel systems?
• What are typical signs of a clogged fuel filter?
• Ice formation in turbine fuel systems is most likely to occur on which component?
• Which heating method can be used to warm turbine fuel as part of an anti-ice strategy?
• Which of the following statements is true? Gas-turbine-engine fuel systems are very susceptible to the formation of ice on the fuel filters.
• Lower vapor pressure of aviation gasoline relative to automotive gasoline implies what about vapor formation risk at ambient conditions?
• Why are integral fuel tanks used in many large aircraft?
• How might an electrical fault manifest in a fuel quantity indication system and how would you isolate it?
• In a dual-pump system, how do the prime circuit and boost circuit differ?
• What is the purpose of a fuel tank vent, and where is it typically located?
• Why is the main fuel strainer located at the lowest point in the fuel system?
• Which statement best differentiates gravity-fed and pressure-fed fuel systems in aircraft?
• On a large aircraft pressure refueling system, a pressure refueling receptacle and control panel will permit one person to
• What is specific gravity, and why is it important for fuel quantity measurements?
• What can be done to eliminate or minimize the microbial growth problem in an aircraft jet fuel tanks?
• Define fuel contamination and describe its typical effects on engine performance and maintenance.
• What is the primary function of a fuel water separator in an aircraft fuel system?
• Which statement best describes the vapor pressure relationship between aviation gasoline and automotive gasoline?
• What is a fuel flow indicator and how is it used in diagnostics?
• How can air enter a fuel system and what effect does it have on operation?
• Instructional procedures for aircraft pressure fueling are normally placarded on the
• What is the primary function of a fuel selector valve?
• What should be done when a low-level warning appears for a specific tank?
• Why is bonding and static electricity control important when servicing fuel systems?
• Fuel is moved overboard in most fuel jettison systems by which device?
• Before applying fuel pressure to diagnose a no-fuel-pressure condition, what is one of the initial checks you should perform?
• Outline the typical procedure to perform a leak test on an aircraft fuel system.
• What is the purpose of sump drains in the diagnostic process?
• How does fuel temperature affect system performance?
• Why is a fuel pressure relief valve used?
• Which component in the fuel system is used to prevent entrained water from freezing by warming the fuel?
• Which component in the fuel system is primarily associated with metering before engine delivery?
• Which action is not a recommended practice when leak-testing injector lines?
• What is the function of a fuel vent system and what issues arise if vents are blocked?
• One problem associated with turbine fuels that is not common with aviation gasolines is ______.
• Which statement correctly describes the common positions of a typical multi-tank fuel selector valve and their function?
• The vapor pressure of aviation gasoline is
• What happens if a cross-feed valve leaks or is stuck?
• Fuel jettisoning is usually accomplished through which arrangement?
• The purpose of the baffle plate in a fuel tank is to
• The function of a fuel heater is to
• Why are bonding and grounding practices critical when servicing fuel systems?
• What is the function of a vented filler cap/vent line?
• What markings must be placed on or near each appropriate fuel filler cover on standard category aircraft?
• How many engine driven fuel pumps per engine are required for engines requiring fuel pumps?
• Which design feature must the fuel jettison valve have to ensure safe operation?
• List the initial steps to diagnose a no-fuel-pressure condition in a system with a boost pump and engine-driven pump.
• What is a crossfeed valve and when is it normally used?
• Which safety practices are essential when performing maintenance on a fuel system near open fuel drains?
• If a leak is detected after performing maintenance on the fuel system, what is the recommended action?
• What is a fuel sump and why is it drained during preflight checks?
• What is the maximum vapor pressure allowable for a aircraft fuel?
• What is one disadvantage of using aromatic aviation fuels?
• What are typical symptoms of a failed engine-driven fuel pump in a system with a backup pump?
• What is the primary function of the fuel pressure regulator in an aircraft fuel system?
• What is the purpose of flapper-type check valves in integral fuel tanks?
• Which are common symptoms of a failed engine-driven fuel pump in a turbine engine?
• What is used in many aircraft to prevent bubbles in the fuel after it leaves the tank when atmospheric pressure is lower than fuel vapor pressure?
• In turbine fuel systems, what hazard arises from entrained water that freezes while passing through filters?
• Which statement about maximum vapor pressure for aircraft fuel is correct?
• An aircraft's integral fuel tank is best described as
• What is the reason for labeling a fuel sample collected from an aircraft drain point?
• What is the role of the fuel system during engine start, particularly in turbine engines?
• Which observation indicates a successful leak test?
• What is fuel icing and how is it prevented?
• In a typical fuel jettison arrangement, where are the outlets located?
• What is the impact of vent line blockage in a fuel system?
• What is the purpose of labeling a fuel sample collected from an aircraft drain point?
• Pressure fueling of aircraft is usually accomplished through