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Peters test 3
| Question | Answer |
|---|---|
| The basic induction system of an aircraft reciprocating engine consist of an _____ used to collect the inlet air and ducting that transfers the air to the _____ | airscoop, inlet filter |
| Induction systems can have different arrangements, they are the ____ and ____ type induction systems | updraft, downdraft |
| Induction system ice can be prevented or eliminated by raising the ____ of the air that passes through the system, using a carberatur ____ system located upsteam near the induction system inletand well ahead of the ______ | temperature, heat, dangerous icing zones |
| The complete induction system for an aircraft engine includes 3 principle sections | airscoop and ducting, carburetor or air control, and intake manifold and pipes |
| What are the 3-types of induction filters? | wetted-type mesh, dry paper, and polyurethane foam filters |
| What are the 3 classified types of induction system icing? | impact, fuel evaporation, and throttle |
| MAP is the pressure inside of what part? | intake manifold |
| When air is compressed, the temperature is ______ | increased/raised |
| What can happen when the fuel-air mixture reaches an excessively high temperature? | preignition |
| The position of the waste gate is controlled by adjusting the _____ in the waste gate actuator | oil pressure |
| The compressor assembly of a turbo supercharger is made up of an ____ a ______ and a ______. | impeller, diffuser, casing |
| The bellmouth is attached to the movable part of the ___and ____ with the engine | test stand, moves |
| High bypass turbofan engines are usually constructed with the fan at the forward end of the compressor. | True |
| The air accelerated by the outer part of the fan blades forms a secondary airstream which is ducted overboard without passing through the ain enigne. This secondary air (fan flow) produces 20% of the thrust in high bypass engines. | False |
| There are 2 general types of exhaust systems in use on reciprocating aircraft engines: the long stack (closed) system and the connector system. | False |
| Although the collector system raises the back pressure of the exhaust, the gain in horsepower from the turbosupercharging more than offsets the loss in horsepower from increased back pressure . | True |
| The augmenters are designed to produce a venturi effect to draw an increased airflow over the engine to augment engine cooling | True |
| Exhaust system parts should never be marked with a lead pencil. | True |
| A good exhaust gasket seal is indicated by a flat gray or sooty black streak on the pipes in the area of the sealed area. | False |
| Daily inspection of the exhaust system usually consist of checking the exposed exhaust system for cracks, scaling, excessive leakage, and clamps. | True |
| Any exhaust system failure should be regarded as a sever hazard | True |
| Approximately half of all muffler and heat exchanger failures can be traced to cracks or ruptures in the heat exchanger surfaces used for cabin and carburetor heat sources. | True |
| Internal muffler failures (baffles, diffusers, etc.) are rarely cause for partial or complete engine power loss by restricting the flow of the exhaust gases. | False |
| When turbocharger or a turbo supercharger system is included, the engine exhaust system operates under decreased pressure and temperature conditions | False |
| Cracks in augmenter tubes can present a fire or carbon monoxide hazard by allowing exhaust gases to enter the nacelle, wing, or cabin areas. | True |
| Turboprop exhaust nozzles provide small amounts of thrust (10-15% ) but are mainly used to discharge the exhaust gases from the aircraft. | True |
| The very first part of the exhaust nozzle and the exhaust plug form a convergent duct to reduce turbulence in the air flow. | True |
| Less air-flow entering the carburetor will tend to make carburetors run richer at altitude than ground level. | True |
| It is necessary that a mixture control be provided to lean mixture and compensate for increased altitude. | False |
| If an engine is operating at high power setting with a very lean mixture, the cylinder-head temperatures would exceed the maximum permissible temperatures and detonation would occur. | True |
| Gasoline and other liquid fuels will burn even if they are not mixed with air. | False |
| A mixture with a ratio of 12 to 1 (12:1) is made up of 12lbs. of air and 1lb. of fuel | True |
| The stoichiometric mixture produces the lowest combustion temperatures because the proportion of heat released to a mass of charge (fuel and air) is greatest. | False |
| An engine running near full power requires a very lean mixture to prevent overheating and detonation. | False |
| As the air speeds up to get through the narrow portion of a venturi, its pressure drops. | True |
| The float-operated needle valve, in float carburetor, regulates the flow through the inlet which maintains the correct level in the fuel float chamber. | True |
| The discharge nozzle is located in the throat of the venturi at the point where the highest increase in pressure occurs as air passes through the carburetor to the engine cylinders | False |
| If the throttle is moved toward the "closed" position, the airflow and fuel flow increase. | False |
| The carburetor main metering system supplies fuel to the engine at all speeds above idling. | True |
| The mixture control system determines the ratio of fuel to air in the mixture. | True |
| A pressure-type carburetor discharges fuel into the airstream at a pressure well below atmospheric pressure. | False |
| Fuel evaporation ice or refrigeration ice is formed because of the decrease in air temperature resulting from the evaporation of fuel after it is introduced into the airstream. | True |
| Gasoline is rated for engine fuel purposes according to its antiknock value; this value is expressed in terms of an _____ number | octane |
| The first number number is the _____ performance number and the second number is the ______ | lean, rich |
| Lead, in the form of ___, is used in relatively small quantities in aviation gasoline to improve antiknock properties | TEL |
| The principle factors governing the grade of fuel required for an engine are the, ____ and the ______ | compression ratio, manifold pressure |
| Any increase in compression ratio above that at which the fuel will burn satisfactorily under full-power conditions will cause ____ and loss of power | detonation |
| Gravity fuel systems must be designed with the fuel tank placed far enough above the carburetor to provide such fuel pressure that the fuel flow can be ____ percent of the fuel flow required for takeoff. | 150 |
| In a pressure system, a ____ pump, usually located at the lowest point in the fuel tank, must be available for engine starting, for takeoff, and for operating at high altitudes. | boost |
| The fuel ____ pump supplies fuel for starting the engine, and the ____ pump supplies the fuel pressure necessary for normal operation | boost, engine |
| All aircraft fuel systems must be equipped with ____ and/or filters to remove dirt particles from the fuel. | strainers |
| Vapor lock in fuel systems is caused to form by the ____ atmospheric pressure of high altitude, and by _____ fuel temperature | low, high |
| The operation of the venturi is based on, _____ principle, which states that the total energy of a particle in motion is constant at all points on its path in a steady flow. | Bernoulli's |
| The pressure in the throat of the venturi tube is _____ than the pressure ay either end of the tube because of the ______ velocity in the constricted portion. | less, increased |
| If a fuel discharge nozzle is place in the venturi throat of a carburetor , the effective force applied to the fuel will depend on the _____ of the air going through the venturi. | velocity |
| The ratio of fuel to air is described as ____ correct when there is just enough oxygen to present in the mixture to burn the fuel completely. | chemically |
| Gasoline will burn in a cylinder if mixed with air in a ratio ranging between ____ parts of air to 1 part of fuel and _____ parts of air to 1 part of fuel (by weight) | 8, 18 |
| A perfectly balanced fuel-air mixture has an F/A ratio of approximately 15:1, or 0.067. This is called a _______ mixture; it is one in which all the fuel and oxygen can be combined in the burning process. | stoichiometric |
| The ratio which shows the amount of fuel consumed by an engine in pounds per hour for each bhp developed is called the _________ | brake specific fuel consumption (bsfc) |
| The mixture of fuel and air which will produce the greatest amount of power for a given consumption of fuel is called ____ mixture | best-economy |
| An exessively lean mixture may cause an engine to ____ through the induction system or to stop completely | backfire |
| The flame ______ in an engine cylinder is the rate at which the flame moves through the mixture of fuel and air. | propagation |
| _____ is caused when raw fuel is permitted to flow through the intake valve into the cylinder head, then out the exhaust valve into the exhaust stack, manifold and muffler, and heat muff. | After firing |
| A ______ is an orifice, or opening, which is carefully dimensioned to meter (measure) fuel flow accurately in accordance with the pressure differential between the float chamber and discharge nozzle. | metering jet |
| The ____ in a carburetor lifts an emulsion of air and liquid to a higher level above the liquid level in the float chamber than would be possible with unmixed fuel. | air bleed |
| The completeness of vaporization depends on the _____ of the fuel, the _____ of the air, and the _____ of atomization | volatility, temperature, degree |
| A _____ valve, usually a butterfly-type valve, is incorporated in the fuel-air duct to regulate the fuel-air output. | throttle |
| The float in a carburetor is designed to control the ____ of fuel in the float chamber. | level |
| The _____ metering system controls the fuel feed in the upper half of the engine speed range, which includes the speeds used for cruising and full-throttle operations. | main |
| An ____ valve stops the flow of fuel through and idling system on some carburetors, and this is used for stopping the engine. | idle cutoff |
| An _____ carburetor is one which the air flows upward through the carburetor to the engine. | updraft |
| In many carburetors, an _____ pump is used to force an extra supply of fuel from the discharge nozzle when the throttle is opened quickly. | accelerating |
| An ____ system is essentially a valve which is closed at low engine and cruising speeds but is opened at high speeds to provide an enriched mixture to reduce burning temperatures and prevent detonation. | economizer or power enrichment |
| A ____ control system can be described as a mechanism or device through which the richness of the mixture entering the engine during the flight can be controlled to a reasonable extent. | mixture |
| Mixture control systems my be classified according to their principles of operation as the _______ type, ______ type, _______ type. | back-suction, needle, airport |
| Some more complex aircraft carburetors are often equipped with a device called an _______ for automatically controlling the mixture as altitude changes. | automatic mixture control |
| The mixture control setting in the position for the maximum fuel flow is the ____ position. | Full rich |
| The mixture control setting which, at a given throttle setting, permits maximum engine rpm with he mixture control as for toward full-rich as possible without reducing the rpm is the _____ position. | rich best power |
| The mixture control setting, at a given throttle setting, permits maximum engine rpm with the mixture control as far toward lean as possible without reducing the rpm is the _____ position | lean best |
| A _____ carburetor takes air from above an engine and causes the air to flow down through the carburetor. | downdraft |
| The process of converting a liquid to a vapor is called _____ | vaporization |
| _____ ice is most likely to form when the throttle is partially closed, such as during letdown for a landing. | Throttle |
| _____ ice is formed by moister-laden air at temperatures below freezing which strikes and freezes on elements of the induction system which are at temperatures of 32 degrees F | Impact |
| The basic principle of the pressure injection carburetor can be explained briefly by stating that ______ is utilized to regulate the pressure of fuel to a metering system which governs the flow of fuel according to the pressure applied. | mass airflow |
| The four main parts of a pressure carburetor system are the, ____ unit, the _____ unit, the _____ unit and the _____. | throttle, regulator, fuel control, discharge nozzle |
| The process of using water with the F/A mixture to provide cooling for the mixture and the cylinders so that additional power can be drawn from the engine without danger of detonation is called _____. | Water injection |
Created by:
Tiana Arch