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Blk 15 Review
Block Review
| Question | Answer |
|---|---|
| Primary purpose of the air bleed openings used on a fuel flow injector nozzle is | aid in proper fuel vaporization |
| What advantages does a fuel injection system have over a carburetor system (2) | Improves acceleration and reduces induction system icing |
| What provides FADEC with electrical power once the N2 compressor reaches 12% | FADEC's Permanent magnet alternator |
| Why are electrical oil pressure gauges preferred over Bourdon tube types | Lighter |
| True or False Adjusting Idle mixture will affect Idle speed | True |
| What are the two sections of a Hydro-mechanical fuel control | Computing and Metering |
| What provides the heat used in fuel heaters (2) | Bleed air and engine oil |
| Primary purpose of a lubricant | Reduce friction between moving parts |
| How do cowl flaps control engine temperature | Regulates the amount of air that passes over the engine |
| Most engine operated fuel pumps are bolted directly to the | Engine crankcase |
| What is the purpose of the float chamber within the float type carburetor | Supply a constant level of fuel to the main metering nozzle |
| In a fuel injected assembly the purpose of the fuel metering section is to meter and control the fuel flow to the | Flow divider |
| What does the automatic mixture control do in an aircraft carburetor | Compensates for changes in air density due to temp or altitude changes |
| What is the purpose of mixing air thru the air spray nozzle of the fuel injection injectors | Atomization |
| A blister develops on the outer synthetic rubber cover it is common practice to | Remove hose, puncture blister,if air emerges pressure test and reinstall hose |
| Which fuel filter provides the greatest filtering action | Micron Filter |
| Explain the procedure for checking the idle mixture on a fuel injected engine | . Set the throttle to idle speed, Then adjust idle mixture RPM until a 25-50 rise is seen while retarding the throttle to idle cutoff. |
| Specific gravity is the comparison of the weight of a substance to the weight of a equal volume of | Distilled water at a specific temperature |
| Why is scavenged turbine engine oil vented from within the accessory case | To maintain oil flow |
| 14CFR Part 23 and 25 require how much expansion space be provided in the engine oil tank | 10% or ½ gallon, whichever is greater |
| Oil pressure-relief valve pressure adjustments should be accomplished | While the engine is idling |
| An oil tank having a capacity of 5 gallons must have an expansion space of | 2 quarts |
| Almost all turbine blade airfoils are internally cooled by means of | Compressor discharge air |
| True or False The pressure in the venturi is affected by the air velocity and air density | False |
| A measure of the economical use of fuel is called | Specific fuel consumption |
| What component permits the passage of oil to the engine when the filter gets clogged or during cold engine starts | The bypass valve |
| Where is the oil supply stored in a wet sump lubrication system | In the oil sump or pan |
| Name the two basic types of oil coolers in general use on turbine engines today | Air-cooled Fuel cooled |
| When high fuel temperatures combine with low fuel pressures within a fuel system that is not equipped with booster pumps what condition may occur | Vapor lock |
| Pressure-injection carburetors provide a pressurized fuel system that is | Closed from the engine fuel pump to the discharge nozzle |
| What is the basic requirement for a fuel metering system regardless of the type of system used or the model engine on which the equipment is installed | Proper fuel/air mixture ratio at all speeds and altitudes |
| Which of the following functions does the float-type carburetor venturi perform | Decreases the pressure at the discharge nozzle |
| How does air density effect carburetor operation relative to increasing altitude | A carburetor has a tendency to run richer as altitude increases |
| Which of the following carburetor systems determines the ratio of fuel to air in the mixture | The mixture-control system |
| Following a new or rebuilt carburetor installation, why is it recommended that the carburetor be filled and left standing with fuel in it for a minimum of 8 hours | To soak the diaphragms |
| Which of the following fuel nozzles is most widely used in most gas turbine engines today | Duplex |
| Engine idle-mixture adjustments should always be accomplished with cylinder head temperatures | At normal operating values |
| Carburetor icing is most severe at | air temperatures between 30 and 40 degrees Fahrenheit |
| How are fuel discharge nozzles in a fuel injected reciprocating engine identified to indicate the flow range | By an identification letter stamped on one of the hexes of the nozzle body |
| The primary function of the fuel heater is to | Protect the engine’s fuel system from ice formation |
| . What indication should the fuel pressure gauge needle read when the engine and booster pumps are not operating | None |
| When accomplishing a complete fuel system inspection, the drain plugs or valves should be opened to check for the presence of | Sediment or water |
| Why are oil coolers used in the lubricating systems of some turbine engines | To reduce the temperature of the oil for circulation through the system |
| What turbine engine component is usually the source for the supply of bleed air to the airflow systems | Compressor |
| The lowest temperature at which fuel will vaporize enough to form a combustible mixture of fuel vapor and air above the liquid fuel | Flash point |
| In a reciprocating dry sump engine oil is returned to the tank by the | Scavenge Pump |
| What would likely cause a hot spot on a reciprocating engine cylinder | Too much cooling fin area broken off |
| Why is it necessary for the carburetor to be equipped with a mixture control device | Because of its tendency to run richer at altitude than on the ground due to the change in air density |
| . What is the basic function of the fuel system in a turbine engine | To provide the engine with the proper amount of fuel, and under the right condition, for satisfactory combustion |
| True or False In the TCM Fuel Injection System, the rotary-vane pump must be timed to the engine for proper fuel distribution | False |
| What would be the end result of having an excessive amount of a cooling fin broken off | The cylinder would not properly cool and a hot spot would develop |
| In a pressure injection carburetor, there is no float chamber. Fuel to the discharge nozzle is by a diaphragm that uses a comparison of what | . Venturi air pressure and carburetor inlet air pressure |
| True or False . Small cracks in cooling fins may be filed or stop drilled to prevent any further cracking | True |
| Specific gravity is the comparison of the weight of a substance to the weight of a equal volume of | Distilled water at a specific temperature |
| True or False Turbine engine use less viscous lubricants than reciprocating engines | True |
| The instrumentation for turbine engine oil systems usually consists of an________ gauge and an ___________ Gauge | Oil Pressure and Oil Temperature |
| Name the two main advantages of synthetic oil over petroleum oil used in turbine engines | It has less tendency to deposit lacquer and coke and less tendency to evaporate at high temperature |
| Name the two turbine oil types used today, including MIL Spec number | Type 1 (MIL-L-7808) Type 2 (MIL-L-23699) |
| What is the bayonet or gasket end of a thermocouple lead typically used for on a reciprocating engine | To produce an indication of engine cylinder temperature |
| What are sometimes installed in the oil supply lines of dry sump oil systems to prevent the reservoir oil from seeping (by gravity) through the oil pump elements and high pressure lines into the engine after shutdown | Check valves |
| To prevent loss by evaporation at the high altitudes at which a turbine engine operates, the oil must be of | Low volatility |
| . What device utilizes magnetism and is capable of collecting ferrite particles indicating internal engine wear and damage | Chip detector |
| What type of lubrication system do most gas turbine engines utilize | Dry-sump |
| The purpose of the engine main oil strainer filter is to | Strain the oil as it leaves the pump before entering various points of lubrication |
| What type of gas turbine engine stores its lubricating oil supply within the engine | Wet-sump |
| What is used on most turbine engines to monitor engine wear possibly providing notification in advance of an internal engine problem (2) | Spectrometric oil analysis Chip detectors at key oil scavenge locations |
| Why do all turbine engine oil tanks have extra space within them | To allow for expansion due to oil foam and heated oil |
| What type of turbine engine oil pump is the most common | Gear |
| Name the two types of manual mixture control devices used on float-type carburetors | Needle type Back-suction type |
| What is incorporated in some engine lubrication systems to prevent high pressures from bursting the oil cooler or blowing off hose connections | Surge protection valves |
| Turbine fuel pumps may be divided into two distinct categories which are | Constant displacement Non-constant displacement |
| What is the function of the flow control valve in oil cooler | It determines which of the two possible paths the oil will take through a cooler |
| What atomizes or vaporizes the fuel within the combustion area of a turbine engine so that it will ignite and burn efficiently | Fuel Spray nozzles |
| In all pressure oil lubrication systems, what limits the oil pressure to a predetermined value | Press. Regulating valve |
| Vapor lock can become serious enough to block _________ completely and cause engine operation failure | Fuel Flow |
| True or False The viscosity of a liquid is a measure of its weight and density | False |
| . What is the most important property which reciprocating engine oils must possess | Its viscosity |
| Where is the oil supply stored in a dry sump oil system | In an external tank |
| True or False Oil tanks are generally associated with wet sump lubrication system | False |
| Which of the following lubricants is most capable of maintaining viscosity quality for the longest period of use | Synthetic oils |
| What are designed and arranged to direct the flow of air evenly around all cylinders of the engine | Baffles |
| What is the primary purpose of a lubricant | To reduce friction between moving parts |
| What do engine cowl flaps regulate | Air flow over the engine |
| The oil supply for a reciprocating engine that has a dry sump system is | Carried in a tank separate from the engine |
| The surface area of an engine cylinder is increased by use of | Cooling fins |
| Generally, at what interval are most aircraft reciprocating engine disposable oil filters replaced | Every 50 hours of operation |
| If the temperature inside the engine cylinder is too great, what may occur | Fuel/air mixture will be preheated |
| Lubricating oil is distributed to the various moving parts of an aircraft internal-combustion engine by which of the following methods | Pressure or combination of pressure-and-splash |
| How is fuel delivered regarding a continuous-flow fuel injection system used on many reciprocating engines | Fuel is injected at each cylinder intake port |
| What is the purpose of the flow divider in a turbine engine duplex fuel nozzle | Creates the primary and secondary fuel supplies |
| During operation of an aircraft engine, the pressure drop in the carburetor venturi depends primarily upon the | Air Velocity |
| What causes the fuel divider valve to open in a turbine engine duplex fuel nozzle | Fuel pressure |
| The device that controls the ratio of the fuel/air mixture to the cylinders is called a | mixture control |
| Fuel lines are kept away from sources of heat, and sharp bends and steep rises are avoided to reduce the possibility of | Vapor Lock |
| The device that controls the volume of the fuel/air mixture to the cylinders is called a | throttle valve |
| The desired engine idle speed and mixture setting | Is adjusted with engine warmed up and operating |
| At what engine speed does the main metering jet actually function as a metering jet in a float type carburetor | All Rpm’s above the idle range |
| The fuel level within the float chamber of a properly adjusted float type carburetor will be | Slightly lower than the discharge nozzle |
| The economizer system in a float type carburetor | Increases the fuel/air ratio at high power settings |
| What is the purpose of the carburetor accelerating system | Temporarily enrich the mixture when the throttle is suddenly opened |
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swarden
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