Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Powerplant for Emman
| Question | Answer |
|---|---|
| Spark plugs are considered worn out when the? | Electrodes have worn away to about two-thirds of their original dimensions Key words two-thirds |
| Generally, when removing a turbine engine igniter plug, in order to eliminate the possibility of the technician receiving a lethal shock, the ignition switch is turned off and? | The transformer-exciter input lead is disconnected and the center electrode grounded to the engine after disconnecting the igniter lead from the plug and waiting the prescribed time. Key words transformer-exciter input lead is disconnected first |
| Why do turbine engine ignition systems require high energy? | To ignite the fuel under conditions of high altitude and low temperatures |
| When removing a shielded spark plug, what is most likely to be damaged? | Core insulator Key words shielded spark plug = core insulator |
| A defective primary capacitor in a magneto is indicated by? | Burned and pitted breaker points Key words defective primary capacitor = burned and pitted breaker points |
| The type of ignition system used on most turbine aircraft engines is? | Capacitor discharge Key words turbine ignition system = capacitor discharge |
| A spark plug is fouled when? | Its spark grounds without jumping electrodes Key words without jumping electrodes |
| Inspection of pneumatic starters by maintainance technicians usually includes checking the? | Oil level and magnetic drain plug condition Key words oil level and magnetic drain plug condition |
| What will be the effect if the spark plugs are gapped to wide? | Hard starting Key words spark plugs gapped to wide = hard starting |
| The term "reach" as applied to spark plug design and/or type, indicates the? | Linear distance from the shell gasket seat to the end of threads on the shell skirt. Key words end of threads on shell skirt |
| The purpose of staggered ignition is to compensate for? | Diluted fuel/ air mixture around exhaust valve. Key words staggered ignition = diluted fuel |
| For what purpose is a turbine engine fuel control unit trimmed? | To obtain maximum thrust output when desired Key words turbine engine trimmed = to obtain max thrust output |
| Under what condition will the trimming of a turbine engine be most accurate? | No wind and low moisture |
| What factor is not used in the operation of an aircraft gas turbine engine fuel control unit? | Mixture control position |
| Fuel is discharged for idling speeds on a float-type carburetor? | From the discharge nozzle Key words fuel discharged for idle speeds = discharge nozzle |
| One purpose of an air bleed in a float-type carburetor is to? | Decrease fuel density and destroy surface tension |
| Main bearing oil seals used with turbine engines are usually what type? | Labyrinth and/ or carbon rubbing Key words main bearing oil seals for turbine engines = Labyrinth or carbon rubbing |
| A fuel or oil fire is defined as a? | Class B fire Fuel or oil fire = class B fire |
| Which statement is correct regarding engine crankshafts? | Moveable counterweights serve to reduce the torsional vibrations in an aircraft aircraft reciprocating engine. Key words torsional vibrations |
| If an engine operates with a low oil pressure and a high oil temperature, the problem may be caused by a? | Leaking oil dilution valve Key words dilution valve |
| What could cause excessive pressure buildup in the crankcase of a reciprocating engine? | Plugged crankcase breather Key words excessive pressure buildup in crankcase = plugged crankcase breather |
| Which statement is correct regarding a four-stroke cycle aircraft engine? | The intake valve closes in the compression stroke Key words intake closes on compression stroke |
| Which of the following will decrease volumetric efficiency in a reciprocating engine? | 3,4, and 5 Key words 3. Inproper valve timing 4. Sharp bends in induction system 5. High carburetor air temperatures |
| At what point in an axial-flow turbojet engine will the highest gas pressures occur? | At the compressor outlet Key words highest gas pressures = compressor outlet |
| Standard sea level temperature is? | 59 degrees Fahrenheit |
| What is the proper starting sequence for a turbojet engine? | Starter,ignition,fuel Key words starter ignition fuel |
| What is the purpose of the diffuser section in a turbine engine? | To increase pressure and reduce velocity Key words diffuser = increase pressure reduce velocity |
| A manifold pressure gauge is designed to? | Indicate absolute pressure in the intake manifold Key words manifold pressure gauge = absolute pressure |
| In what units are turbine engine tachometers calibrated? | Percent of engine R P M Key words tachometers = percent of engine R P M |
| What would be the possible cause if a gas turbine engine has high exhaust gas temperature, high fuel flow, and low R P M at all engine power settings? | Turbine damage or loss of turbine efficiency Key words low engine R P M at all speed = turbine damage |
| What is the operating principle of the spot detector sensor in a fire detection system? | A bi-metallic thermoswitch that closes when heated to a high temperature Key words spot detector fire detection system = bi-metallic thermoswitch |
| Electrical circuit protection devices are installed primarily to protect the? | Wiring |
| How are the rotor windings of an aircraft alternator usually excited? | By a variable direct current |
| The valve assemblies of opposed reciprocating engines are lubricated by means of a? | Pressure system Key words valve assemblies lubrication = pressure system |
| If staggered ignition timing is used, the? | Spark plug nearest the exhaust valve will fire first Key words nearest exhaust valve |
| Reciprocating engine power will be decreased at all altitudes if the? | Humidity is increased Key words decreased power = humidity rise |
| Dislodge internal muffler baffles on a small reciprocating engine may? | Obstruct the muffler outlet and cause excessive exhaust back pressure. Key words dislodge internal muffler baffles = excessive exhaust back pressure |
| High cylinder head temperatures are likely to result from? | A very lean mixture at high power settings Key words high cylinder head temperatures = very lean mixture at high power settings |
| Where would a carburetor air heater be located in a fuel injection system? | None is required |
| What are the three basic regulating components of a sea-level boosted turbocharger system? | 1,4,5 Key words 1. Exhaust bypass assembly 4. Density controller 5. Differential pressure controller |
| Boost manifold pressure is generally considered to be any manifold pressure above? | 30 inches Hg. |
| Most large aircraft reciprocating engines are equipped with which of the following types of engine-driven fuel pumps? | Rotary-vane-type fuel pump Key words rotary |
| What are the positions of the pressurization valve and the dump valve in a jet engine fuel system when the engine is shut down? | Pressurization valve closed, dump valve open |
| What likely effect would a cracked distributor rotor have on a magneto? | Ground the secondary circuit through the crack |
| Instruments that provide readings of low or negative pressure, such as manifold pressure gauges, are usually what type? | Diaphragm or bellows Key words low or negative pressure readings = diaphragm or bellows |
| Which of the following types of electric motors are commonly used in electric tachometers? | Synchronous motors Commonly used electric tachometers = synchronous motors |
| What is the possible cause when a turbine engine indicates no change in power setting parameters, but oil temperature is high? | Engine main bearing distress Key words Oil temperature is high = main bearing distress |
| The fan rotational speed of dual axial compressor forward fan engine is the same as the? | Low-pressure compressor |
| Which fuel/air mixture will result in the highest engine temperature (all other factors remaining constant)? | A mixture leaner than a manual lean mixture of .060 Key words leaner than manual lean mixture of .060 |
| What is the best indication of worn valve guides? | High oil consumption Key words Worn valve guides = high oil consumption |
| Excessive valve clearance results in the valves opening? | Late and closing early Key words excessive valve clearance = open late and closing |
| What could cause excessive pressure buildup in crankcase of reciprocating engine? | Plugged crankcase breather Key words excessive pressure buildup in reciprocating engine = plugged crankcase breather |
| If the hot clearance is used to set the valves when the engine is cold, what will occur during operation of engine? | The valves will open late and close early. Key words open late close early |
| To what altitude will a turbo charged engine maintain sea level pressure? | Critical altitude. Key words altitude that maintains sea level = critical altitude |
| Valve clearance changes on opposed-type engines using hydraulic lifters are accomplished by? | Push rod replacement Key words Hydraulic lifters = push rod replacement |
| Who establishes mandatory replacment times for critical components of turbine engines? | The engine manufacturer Key words mandatory replacment times for turbine engine = engine manufacturer |
| What type igniter plug is used in the low tension ignition system of an aircraft turbo fan engine? | Self-ionizing or shunted-gap type plug Key words low tension ignition system for turbo fan engine = self ionizing or shunted-gap type plug |
| What is the primary factor which controls the pressure ratio of an axial-flow compressor? | Number of stages in compressor Key words primary factor that controls pressure ratio = number of stages |
| What is the primary advantage of an axial-flow compressor over a centrifugal compressor? | Greater pressure ratio Key words axial-flow compressor = greater pressure ratio than centrifugal type compressor |
| Which of the following contains a minimum checklist for 100-hour inspections of engines? | 14 c f r part 43 appendix d Key words minimum checklist for 100100-hour inspection = 14 c f r part 43 appendix d |
| Which unit accurately indicates fuel consumption of a reciprocating engine? | Fuel flow meter Key words fuel consumption indication for reciprocating engine = fuel flow meter |
| Which of the following is a primary engine instrument? | Tachometer Key words primary engine instrument = tachometer |
| Which fire detection system will detect fire when an element is inoperative but will not test when the test circuit is energized? | Kidde system and fenwal system Key words fire detection system that will not test when circuit is energized = kidde system and fenwal system |
| A typical barrier type aircraft terminal strip is made of? | Paper-base phenolic compound Key words paper-base |
| What is used to polish commutators or slip rings? | Very fine sandpaper. Key words polish commutators = very fine sandpaper |
| Upon what does the output frequency of an a c generator (alternator) depend? | The speed of rotation and the number of field poles Key words frequency of a c generator = speed of rotation and number of field poles |
| The reason for flashing the field in a generator is to? | Restore correct polarity and/or residual magnesium to the field poles. Flashing the field = restore correct polarity |
| What is the source of the most heat that is absorbed by the lubricating oil in a reciprocating engine? | Pistons and cylinder walls Key words most heat that is absorbed by oil is pistons and cylinder walls |
| Usually most of the load placed on an APU occurs when? | The bleed air valve is opened Key words bleed air valve opened |
| How is anti-icing fluid ejected from the slinger ring on a propeller? | By centrifugal force Key words Fuel ejected = centrifugal force |
| Oil leakage around the rear cone of a hydromatic propeller usually indicates a defective? | Spider-shaft oil seal Key words oil leakage around rear cone = spider-shaft oil seal |
| Engines using cold stream, or both cold and hot stream reversing include? | High bypass turbo fans Key words high bypass turbo fans |
| The application of carburetor heat will have which of the following effects? | The mixture will become richer Key words carburetor heat = richer mixture |
| When an electric primer is used, fuel pressure is built up by the? | Booster pump Key words electric primer = booster pump |
| Fuel cross feed systems are used in aircraft to? | Maintain aircraft stability Key words cross feed system = maintain aircraft stability |
| (Refer to figure 7) What is the purpose of the fuel transfer ejectors? | To Assist in the transfer of fuel from the main tank to the boost pump sump Key words figure 7 = boost pump sump |
| The economizer system in a float type carburetor? | Increases the fuel/air ratio at high power settings Key words economizer =increase the fuel/air ratio at high power settings |
| The device that controls the volume of the fuel/air mixture to the cylinders is called a? | Throttle valve Key words Device that controls volume of fuel/air mixture to cylinders = throttle valve |
| When in operation, the speed of an A P U? | Remains at or near rated speed regardless of the load condition. Key words A P U speed = remains at or near rated speed |
| The blade angle of a fixed-pitch propeller? | Is smallest at the tip Key words Blade angle = smallest at the tip |
| What operational force tends to increase propeller blade angle? | Aerodynamic twisting force Force that tends to increase propeller blade angle = aerodynamic twisting force |
| Which of the following functions requires the use of a propeller blade station? | Measuring blade angle Key words propeller blade station repair = measuring blade angle |
| What is the function of a blast tube as found on aircraft engines? | A device to cool an engine accessory Key words Blast tube = device used to cool engine accessory |
| Which pump is commonly used as a fuel pump on reciprocating engines? | Vane Key words Fuel pump for reciprocating engines = vane type pump |
| The back-suction mixture control system operates by? | Varying the pressure acting on the fuel in the float chamber. Key words Back suction mixture control = varying pressure on fuel |
| During the operation of an aircraft engine, the pressure drop in the carburetor venturi depends primarily upon? | Air Velocity Key words pressure drop in carburetor venturi = air velocity |
| The purpose of a three-way propeller valve is to? | Direct oil from the engine oil system to the propeller cylinder. Key words three-way propeller = direct oil from oil system to propeller cylinder |
| What operational force causes propeller blade tips to lag in the opposite direction of rotation? | Torque bending force Key words causes propeller blade tips to lag in opposite direction = torque bending force |
| Propeller aerodynamic (thrust) imbalance can be largely eliminated by? | Correct blade contouring and angle setting Key words propeller aerodynamic thrust imbalance elimination = correct blade contouring and angle setting |
| What unit in the propeller anti-icing system controls the output of the pump? | Rheostat Key words unit that controls anti-icing output pump = rheostat |
| Reciprocating engines used in helicopters are cooled by? | A fan mounted on the engine Key words helicopter reciprocating engine cooling = fan mounted on th he engine |
| Prolonged idling of an engine will usually result in? | Foriegn material buildup on spark plugs Key words prolonged idling = foreign material buildup on spark plugs |
| Generally, a small crack just started in a cylinder baffle? | May be stop drill |
| Carburetor icing may be eliminated by which of the following methods? | Alcohol spray and heated induction air Key words carb icing = alcohol spray and heated induction air |
| Fuel pressure produced by the engine-driven pump is adjusted by the? | Relief valve adjusting screw Key words fuel pressure adjustment for engine driven pump = relief valve adjusting screw |
| A fuel strainer or filter must be located between the? | Tank outlet and the fuel metering device. Key words fuel strainer of filter location = between tank outlet and fuel metering device |
| What carburetor component actually limits the desired maximum airflow to the engine at full throttle? | Vanturi Key words carburetor component that limits the desired max airflow at full throttle = vanturi |
| When trimming a turbine engine, the fuel control is adjusted to? | Set idle R P M and maximum speed or E P R Key words trimming turbine engine, fuel control adjustment = set idle R P M and max fuel control |
| The centrifugal twisting moment of an operating propeller tends to? | Reduce the pitch angle Key words centrifugal twisting moment = reduce the pitch angle |
| Counterweights on constant-speed propellers are generally used to aid in? | Increasing blade angle Purpose for Counterweights on constant-speed propellers = increase blade angle |
| Augmenter tubes are part of which reciprocating engine system? | Exhaust Key words augmenter tubes = exhaust part of reciprocating engine |
| Increased engine heat will cause volumetric efficiency to? | Decreased Key words increased heat = decrease in volumetric efficiency |
| What directly regulates the speed of a turbocharger? | Waste gate Directly regulates speed of turbocharger |
| A rotary-vane pump is best described as a? | Positive-diplacement pump Key word rotary-vane pump = positive displacement |
| Usually, most of the load placed on an A P U occurs when? | The bleed air valve is opened Key words most load placed on A P U = bleed air valve |
| Why is the pulley stop screw on a propeller governor adjustable? | To limit the maximum engine speed during takeoff. Key words propeller pulley stop screw = limit max speed during takeoff |
| Sodium-filled valves are advantageous to an aviation engine because they? | Dissipate heat well Key word sodium-filled = dissipate heat well |
| Boost pumps in fuel system? | Provide a positive flow of fuel to the engine pump Key words boost pumps = provide positive flow of fuel |
| Where is the engine fuel shutoff valve usually located? | Aft of firewall Key words fuel shutoff valve = aft of firewall |
| When troubleshooting an engine for too rich a mixture to allow the engine to idle, what would be a possible cause? | Economizer valve not operating correctly Key words too rich mixture = economizer valve not operating correctly |
| When air passes through the venturi of a carburetor, what three changes occur? | Velocity increases, temperature decreases, and pressure decreases. Key words air passing through venturi = velocity increases, temperature and pressure decreases |
| What method is ordinarily used to make idle speed adjustments on a float-type carburetor? | An adjustable throttle stop or linkage. Key words idle speed adjustments = adjustable throttle stop and linkage |
| What fuel/air mixture will result in highest engine temperature (all other factors remaining constant)? | A mixture leaner than a manual lean mixture of .060. Key words highest engine temperature = mixture leaner than manual lean mixture of .060 |
| Cam-ground pistons are installed in some aircraft engines to? | Provide a better fit at operating temperatures Key words cam-ground pistons = better fit at operating temperatures |
| The pressure of supersonic air as it flows through a divergent nozzle? | Decreases Key words pressure in divergent = decreases |
| Indentations on bearing races caused by high static loads are known as? | Brinelling Key words high static loads = brinelling |
| Which type of electric motors are commonly used in electric tachometers? | Synchronous motors Key words tachometers = synchronous motors |
| How is the fire-extinguishing agent distributed in the engine section? | Spray nozzles and perforated tubing Key words fire-extinguishing agent distribution = spray nozzles and perforated tubing |
| An A P U is usually rotated during start by? | An electric starter Key words A P U rotated = electric starter |
| The primary purpose of a propeller is to? | Change engine horsepower to thrust Key words primary purpose of propeller = change engine horsepower to thrust |
| It is important that nicks in aluminum alloy propeller blades be repaired as soon as possible in order to? | Eliminate stress concentration points |
| What is the purpose of the flow divider in a turbine engine duplex fuel nozzle? | Creates the primary and second fuel supplies |
| In a turbine engine D C capacitor discharge ignition system, where are the high-voltage pulses formed ? | At the triggering transformer |
| What is the primary purpose of the oil breather pressurization system that is used on turbine engines? | Provides a proper oil spray pattern from the main bearing oil jets. |
| Backfiring through the carburetor generally results from the use of? | An excessively lean mixture Key words backfiring in carburetor = excessive lean mixture |
| Maximum taper contact between crankshaft and propeller hub is determined by using? | Bearing blue color transfer Key words bearing blue color |
| What is the purpose of a slip ring joint in an exhaust collector ring? | It aids in alignment and absorbs expansion. Purpose of slip joint in exhaust collector ring = aids in alignment and absorbs expansion |
| How should ceramic coated exhaust components be cleaned? | By degreasing Key words ceramic coating for exhaust components = degreasing |
| What factoring the failure of an engine to develop full power at takeoff? | Improper adjustment of carburetor heat valve control linkage Key words improper carburetor heat valve control linkage |
| As manifold pressure increases in a reciprocating engine, the? | Density of air in the cylinder increases Key words manifold pressure increase = density of air increases inside cylinder |
| An aircraft carburetor is equipped with a mixture control in order to prevent the mixture from becoming too? | Rich at high altitudes Key words carburetor = prevents mixture from becoming too rich at high altitudes |
| The economizer system in a float type-carburetor? | Increases fuel-air ratio at high power settings Key words economizer in float type carburetor = increases fuel-air ratio at high power settings |
| Which of the following is not an input parameter for a turbine engine fuel control unit? | Ambient humidity Key words not an input parameter for turbine engine control = ambient humidity |
| Grinding the valves of a reciprocating engine to a feather edge is likely to result in? | Preignition and burned valves Key words grinding valves to feather edge = preignition and burned valves |
| The stator vanes in an axial-flow compressor? | Convert velocity energy into pressure energy. Key words stator vanes in compressor = convert velocity into pressure |
| The engine pressure ratio (E P R) indicator is a direct indication of? | Engine thrust being produced Key words (E P R) = thrust being produced |
| The primary concern in establishing the firing order for an opposed engine is to? | Provide for balance and eliminate vibration to the greatest extent possible. Key words firing order = provide balance and eliminates vibration |
| Excessive valve clearance results in the valve opening? | Late and closing early Key words excessive valve clearance = valves opening late and closing early |
| What could cause excessive pressure buildup in the crankcase of a reciprocating engine? | Plugged crankcase breather Key words excessive pressure buildup in crankcase = plugged crankcase breather |
| When is the fuel/air mixture ignited in a conventional reciprocating engine? | Shortly before the piston reaches the top of the compression stroke. Key words fuel/air mixture ignition in cylinder = shortly before piston reaches top dead center of compression stroke |
| The highest heat-to-metal contact in a jet engine is the? | Turbine inlet guide vanes Key words highest heat-to-metal contact = turbine inlet guide vanes |
| What should be done initially if a turbine engine catches fire when starting? | Turn off the fuel and continue engine rotation with the starter. Key words turbine engine catches fire = turn off fuel and continue engine rotation |
| In a turbine engine with a dual spool compressor, the low speed compressor? | Seeks it's own best operating speed Key words dual spool low speed compressor = seeks out it's own best operating speed |
| At what point in an axial-flow turbojet engine will the highest gas pressures occur? | At the compressor outlet Key words highest gas pressures = compressor outlet |
| What is the primary purpose of the tachometer on an axial-compressor turbine engine? | Monitor engine R P M during starting and to indicate over speed conditions. |
| A fire detection system operates on the principle of a buildup of gas pressure within a tube proportional to temperature. Which of the following systems does this statement define? | Lindberg continues-element system Key words buildup of gas pressure and temperature = lindberg system |
| A fire involving energized electrical equipment is defined as a? | Class C fire Ket words energized electrical equipment = class C fire |
| What are the two types of ac motors that are used to produce relatively high torque? | Three-phase induction and capacitor start. Key words two types of AC motors that produce high torque = three-phase induction and capacitor start |
| What is the purpose of a reverse-current cutout relay? | It opens the main generator circuit whenever the generator voltage drops below the battery voltage. Key words purpose for reverse current layout = opens main generator circuit whenever generator voltage drops below battery voltage |
| When installing electrical wiring parallel to a fuel line, the wiring should be? | Above the fuel line. |
| Upon what does the output frequency of an a c generator alternator depend? | The speed of rotation and number of field poles Key words speed of rotation and number of field poles |
| The purpose of a dwell chamber in a turbine engine oil tank is to provide? | Separation of entrained air from scavaged oil. Key words purpose of dwell chamber = separation of air from oil |
| What are the principal advantages of the duplex fuel nozzle used in many turbine engines? | Provides better atomization and uniform flow pattern. Key words duplex fuel nozzle = better atomization and uniform flow pattern |
| Boost pumps in a fuel system? | Provide a positive flow of fuel to the engine pump Key words boost pump = provide positive flow of fuel to engine pump |
| What is the final authority for the detail of carburetor overhaul? | The manufacturer's recommendations Key words final authority for carburetor overhaul = manufacturer's recommendations |
| During what period does the fuel pump bypass valve open and remain open? | When the boost pump pressure is greater than fuel pump pressure. |
| Which statement is true regarding proper throttle rigging of an aircraft? | The throttle stop on the carburetor must be contacted before the stop in the cockpit |
| The Federal Aviation regulations require the fuel flow rate for gravity system to be? | 150 percent of takeoff fuel consumption of the engine Key words 150 percent |
| Excessively rich or lean idle mixtures result in? | Incomplete combustion Key words excessive rich or lean idle mix = incomplete combustion |
| How often should float carburetors be overhauled? | At engine overhaul Key words at engine overhaul |
| The purpose of the diaphragm in most vane-type fuel pumps is to? | Compensate fuel pressure to altitude changes Key words key words purpose for diaphragm in most vane-type fuel pumps = compensate fuel pressure to altitude changes |
| What is the purpose of the flow divider in a turbine engine fuel nozzle? | Creates the primary and secondary fuel supplies. Key words flow divider = creates primary and secondary fuel supplies |
| It is necessary to control acceleration and deceleration rates in turbine engines in order to? | Prevent blowout or die-out Key words prevent blowout or die-out |
| Fuel pressure produced by the engine driven fuel pump is adjusted by the? | Relief valves adjusting screw Key words engine driven fuel pump adjustment = relief valve adjusting screw |
| What is the profile of a turbine engine compressor blade? | A reduced blade tip thickness Key words profile = reduced blade tip thickness |
| An exhaust cone placed aft of the turbine in a jet engine will cause the pressure in the first part of the exhaust duct to? | Increase and the velocity to decrease. Key words exhaust cone / divergent duct = increased pressure and decreased velocity/ speed |
| A turbine engine compressor which contains vanes on both sides of the impeller is a? | Double entry centrifugal compressor Key words compressor with vanes on both side = double entry centrifugal compressor |
| What is one purpose of the stator blades in the compressor section of the airflow? | Control the direction of the airflow Key words purpose of stator blades in compressor section = controls direction of airflow |
| The diffuser section of a jet engine is located between? | The compressor section and the burner section Key words location of diffuser = in between the compressor section and the burner section |
| Which turbine engine compressor offers the greatest advantages for both starting flexibility and improved high-altitude performance? | Split-spool, axial-flow Key words starting flexibility and improved high altitude performance = split-spool, axial-flow |
| An advantage of the centrifugal-flow compressor is it's high? | Pressure rise per stage Key words advantage of centrifugal- flow compressor = pressure rise per stage |
| The stator vanes in an axial-flow compressor? | Convert velocity energy into pressure energy |
| What is used in turbine engines to aid in stabilization of compressor airflow during low thrust engine operation? | Variable guide vanes and/or compressor bleed valves |
| Anti-icing of jet engine air inlets is commonly accomplished by? | Engine bleed air ducted through the critical areas |
| The air passing through the combustion chamber of a turbine engine is? | Used to support combustion and to cool the engine Key words air passing through combustion chamber = support combustion and cool engine |
| Newton's First Law of Motion, generally termed the law of inertia, states? | Every body persists in its state of rest, or of motion in a straight line, unless acted upon by some outside force. Key words law of inertia = every body persists in its state of rest unless acted upon by some outside force |
| Severe rubbing of turbine engine compressor blades will usually cause? | Galling Key words rubbing of turbine engine compressor blades = galling |
| Which of the following influences the operation of an automatic fuel control unit on a turbojet engine? | Burner pressure Key words influences operation of automatic fuel control unit = burner pressure |
| If a turbine engine is unable to reach takeoff E P R before its E G T limit is reached, this is an indication that the? | Compressor may be contaminated or damaged |
| Continued and/or excessive heat and centrifugal force on turbine engine rotor blades is likely to cause? | Creep Key words continued and/or excessive heat and centrifugal force = creep |
| What term is used to describe a permanent and cumulative deformation of the turbine blades of a turbojet engine? | Creep Key words permanent and cumulative deformation = creep |
| An oil separator is generally associated with what? | Engine-driven vacuum pump Key words oil separator = engine-driven vacuum pump |
| Lubricating oils with high viscosity index ratings are oils? | In which the viscosity does not vary much with temperature change. Key words does not vary much temperature |
| Compared to reciprocating engine oils, the types of oils used in turbine engines? | Have less tendency to produce lacquer or coke Key words turbine engine oils = less tendency to produce lacquer or coke |
| The oil used in reciprocating engines have a relatively high viscosity due to? | Large clearances and high operating temperatures. Key words reciprocating engine viscosity = large clearances and high operating temperatures |
| Which of these characteristics is desirable in turbine engine oil? | High flash point Key words describe characteristics in turbine engine oil = high flash point |
| What type of oil system is usually found on turbine engines? | Dry sump, pressure, and spray Oil systems = dry sump, pressure, and spray |
| What factor helps determine the proper grade of oil to use in a particular engine? | Operating speeds of bearings Key words factor that determines proper grade of oil for particular engine = operating speeds of bearings |
| Specific gravity is a comparison of the weight of a substance to the weight of an equal volume of? | Distilled water at a specific temperature |
| What has the greatest effect on the viscosity of lubricating oil? | Temperature Key words greatest effect on viscosity = temperature |
| The recommended aircraft engine lubricants are? | Mineral or synthetic based Key words recommended aircraft engine lubricants = mineral or synthetic based |
| High tooth pressures and high rubbing velocities, such as occur with spur-type gears, require the use of? | An E P lubricant Ket words high tooth pressures = E P lubricant extreme pressure lubricant |
| What type of oil do most engine manufacturers recommend for new reciprocating engine break-in? | Straight mineral oil Key words reciprocating engine break-in = straight mineral oil |
| What type of oil do most engine manufacturers recommend after new reciprocating engine break-in? | Ashless-dispersant oil Key words after break-in = Ashless dispersant oil |
| In a reciprocating engine oil system, the temperature bulb senses oil temperature? | At a point after the oil has passed through the oil cooler? Key words temperature-sensing bulb senses oil = at a point after the oil has passed through oil cooler |
| In an axial-flow turbine engine, compressor bleed air is sometimes used to aid in cooling the? | Turbine, vanes, blades, and bearings |
| What prevents pressure within the lubricating oil tank from rising above or falling below ambient pressure (reciprocating engine)? | Oil tank vent. Key words prevents pressure within lubricating oil tank from rising = oil tank vent |
| What is a function of the fuel-oil heat exchanger on a turbojet engine? | Increases fuel temperature Key words function of fuel-oil heat exchanger = increases fuel temperature |
| Oil tank filters on reciprocating engines are marked with the word? | Oil , in accordance with 14 C F R part 23 |
| After making a welded repair to a pressurized turbine engine oil tank, the tank should be pressure checked to? | Not less than 5 P S I plus the max operating pressure of the tank. Key words not less than 5 P S I plus max operating pressure |
| What would be the probable result if the oil system pressure relief valve should stick in the open position on a turbine engine? | Insufficient lubrication Key words relief valve sticking open = insufficient lubrication |
| What is a function of the fuel-oil heat exchanger on a turbojet engine? | Increases fuel temperature Key words fuel oil heat exchanger = increases fuel temperature |
| What is the primary purpose of the oil-to-fuel heat exchanger? | Cool the oil Key words oil-to-fuel heat exchanger = cool the oil |
| Why are fixed orifice nozzles used in the lubrication system of gas turbine engines? | To provide a relatively constant oil flow to the main bearing at all engine speeds. Key words fixed orifice nozzles = provide relatively constant oil flow |
| What is the primary purpose of the oil breather pressurization system that is used on turbine engines? | Provides a proper oil spray pattern from the main bearing oil jets. Key words primary purpose of the oil breather pressurization system = provides proper oil spray pattern |
| What is the purpose of the check valve generally used in a dry sump lubrication system? | To prevent the oil from supply tank from seeping into the crankcase during inoperative periods. Key words purpose of check valve in dry sump lubrication system = prevent oil from seeping into crankcase during inoperative periods |
| What factor has the least effect on the oil consumption of a specific engine? | Mechanical efficiency Key words factor that has the least effect on oil consumption = mechanical efficiency |
| How is the oil collected by the piston oil ring returned to the crankcase? | Through holes drilled in the piston oil ring groove. Key words oil collected by piston oil ring is required to crankcase = through holes drilled in piston oil ring groove |
| As an aid to cold-weather starting, the oil dilution system thins the oil with? | Gasoline Key words aid in cold weather oil dilution = gasoline |
| Which of the following lubrication system components is never located between the pressure pump and the engine pressure system? | Fuel line for oil dilution system Key words system that is never located between pressure pump and engine pressure system = fuel line for oil dilution system |
| Where is the oil temperature bulb located on a dry sump reciprocating engine? | Oil inlet line Key words oil temperature bulb location = oil inlet line |
| What is the primary purpose of changing aircraft engine lubricating oils at predetermined periods? | The oil becomes contaminated with moisture, acids, and finely divided suspended solid particles. Key words oil becomes contaminated |
| The purpose of the flow control valve in a reciprocating engine oil system is to? | Direct oil through or around the oil cooler. Key words purpose of flow control valve = direct oil through or around oil cooler |
| Where are sludge chambers, when used in aircraft engine lubrication systems, usually located? | In the crankshaft throws Key words sludge chambers location = in crankshaft throws |
| At cruise R P M, some oil will flow through the relief valve of a gear type oil pump. This is normal as the relief valve is set at a pressure which is? | Lower than the pressure pump capabilities. Key words relief valve set at = lower than pressure pump capabilities |
| In which of the following situations will the oil cooler automatic bypass valve be open the greatest amount? | Engine oil below normal operating temperature Key words oil cooler automatic bypass valve open at greatest amount = engine oil below normal operating temperature |
| The valve assemblies of opposed reciprocating engines are lubricated by means of a? | Pressure system Valve assemblies of opposed reciprocating engine lubrication = pressure system |
| What will result if an oil filter becomes completely blocked? | Oil will flow at the normal rate through the system Key words oil filter becomes completely blocked = oil will flow at normal rate |
| A turbine engine dry sump lubrication system of the self contained, high pressure design? | Consist of pressure, breathing, and scavenge subsystems. Key words dry sump lubrication system = consist of pressure, breather, and scavenge subsystems |
| An engine lubrication system pressure relief valve is usually located between the? | Pump and the internal oil system Key words pump and the internal oil system |
| A drop on oil pressure may be caused by? | Foreign material under the relief valve Key words drop on oil pressure = foreign material under relief valve |
| What type valve prevents oil from entering the main accessory case when the engine is not running? | Check Key words valve that prevents oil from entering main accessory case when engine is not running = check valve |
| An oil tank having a capacity of 5 gallons must have an expansion space of? | 2 quarts Key words oil tank with 5 gallons = 2 quarts expansion space |
| The stationary field strength in a direct current generator is varied? | According to the load requirements Key words stationary field strength varied = according to the load requirements |
| What type of electric motor is generally used with a direct-cranking engine start? | Direct current, serious-wound motor Key words direct cranking engine = direct current, serious wound motor |
| Upon what does the output frequency of an A C generator alternator depend? | The speed of rotation and the number of field poles Key words output frequency of A C generator alternator = speed of rotation and number of field poles |
| Alternators that are driven by a constant speed drive mechanism are used to regulate the alternator to constant? | Hertz output Key words alternators driven by constant speed drive mechanism are used to regulate the alternator to constant = Hertz output |
| If a generator is malfunctioning, its voltage can be reduced to residual by actuating the? | Generator master switch Key words malfunctioning generator can be reduced to residual = by actuating the generator master switch |
| If the points in a vibrator type voltage regulator stick in the closed position while the generator is operating, what will be the probable result? | Generator output voltage will increase Key words points in vibrator type voltage regulator stick in closed position while the generator is operating = generator output voltage will increase |
| As the flux density in the field of a D C generator increases and the current flow to the system increases, the? | Force required to turn the generator increases. Key words flux density in field of D C generator increases and current flow increases = force required to turn the generator increases |
| What is the purpose of a reverse-current cutout relay? | It opens the main generator circuit whenever the generator voltage drops below the battery voltage. Key words drops below battery voltage |
| Why is it unnecessary to flash the field of the exciter on a brushless alternator? | Permanent magnets are installed in the main field poles. Key words permanent magnets are installed |
| How are the rotor windings of an aircraft alternator usually excited? | By a variable direct current Key words rotor windings of alternator excited = by variable direct current |
| What precaution is usually taken to prevent electrolyte from freezing in a lead acid battery? | Keep the battery fully charged Key words lead acid battery electrolytic freezing prevention = keep the battery fully charged |
| The reason for flashing the field in a generator is to? | Restore correct polarity and/or residual magnesium to the field poles Key words flashing the field = restore correct polarity |
| The part of a D C alternator power system that prevents reverse flow of current from the battery to the alternator is the? | Rectifier Key words D C alternator power system that prevents reverse flow of current = rectifier |
| The constant current method of charging a ni-cad battery? | Is the method most effective in maintaining cell balance Constant current method of charging ni-cad battery = most effectively method of maintaining cell balance |
| Which of the following aircraft circuits does Not contain a fuse/circuit breaker? | Starter circuit Key words circuit that does not contain a fuse/circuit breaker = starter circuit |
| The resistance of current return path through the aircraft is always considered negligible, provided the? | Structure is adequately bonded Key words structure is adequately bonded |
| When does current flow through the coil of a solenoid operated electrical switch? | Continually, as long as the control circuit is complete Key words as long as the control circuit is complete |
| Bonding jumpers should be designed and installed in such a manner that they? | Provide a low electrical resistance in the ground circuit. Key words provide a low electrical resistance in ground circuit |
| Arcing at the brushes and burning of the commutator of a motor may be caused by? | Weak brush springs Arcing of brushes and burning of commutator of motor = weak brush springs |
| The max allowable voltage drop between the generator and the bus bar is? | 2 percent of the regulated voltage Key words max allowable voltage drop between generator and bus bar = 2 percent of the regulated voltage |
| What speed must an eight-pole A C generator turn to produce 400 Hertz A C? | 6000 R P M Key words 400 times 120 divided by the number of poles equals 6000 R P M |
| How many basic types of circuit breakers are used in Powerplant installation electrical systems? | Three Key words how many basic types of circuit breakers are used in Powerplant installation = 3 |
| The time/current capabilities of a circuit breaker or fuse must be? | Below those of the associated conductor Key words time/current capabilities of circuit breaker = below those of the associated conductor |
| Electrical switches are rated according to the? | Voltage and the current they control Key words electrical switches are rated according = to the voltage and the current they control |
| What is the smallest terminal stud allowed for aircraft electrical power systems? | Number 10 Key word smallest terminal stud allowed = number 10 |
| A typical barrier type aircraft terminal strip is made of? | Paper-base phenolic compound Key words barrier type aircraft terminal strip = paper base phenolic compound |
| Aircraft copper electrical wire is coated with tin,silver, or nickel in order to? | Prevent oxidation Key words prevent oxidation |
| Which of the following contains a minimum checklist for 100-hour inspections of engines? | 14 C F R Part 43 appendix D Key words minimum checklist for 100-hour inspections = 14 C F R part 43 appendix d |
| A severe condition of chafing or fretting in which a transfer of metal from one part to another occurs is called? | Galling Key words severe case of chafing or fretting = galling |
| Indentations on bearing races caused by high static loads are known as? | Brinelling Key words indentations on bearing races caused by high static loads = brinelling |
| What publication would be used to obtain crankshaft run out tolerance? | Current manufacturers maintenance instructions Key words crankshaft run out tolerances = current manufacturer's maintenance instructions |
| What publication contains the mandatory time for parts of turbine engine? | Engine manufacturers service instructions Key words service instructions |
| How are 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. Key words discharge nozzle identification = by an identification letter |
| Which unit most accurately indicates fuel consumption of a reciprocating engine? | Fuel flow meter Key words unit that most accurately indicates fuel consumption = fuel flow meter |
| Basically, the indicator of a tachometer system is responsive to change in? | Frequently Key words tachometer indicator = frequently |
| Which statement is correct concerning a thermocouple temperature indicating instrument system? | It requires no external power source Key words requires no external power source |
| Basically, the indicator of a tachometer system is responsive to change in? | Frequency Key words tachometer indicator is responsive to = frequency |
| What basic meter is used to indicate cylinder head temperature in most aircraft? | Galvanometer Key words cylinder head temperature meter = galvanometer |
| Which of the following is a primary engine instrument? | Tachometer Key words primary engine instrument = tachometer |
| What unit in a tachometer system sends information to the indicator? | The three-phase A C generator Key words unit that sends information to indicator = three-phase A C generator |
| What unit in a tachometer system sends information to the indicator? | The three-phase A C generator Key words unit in tachometer that sends info to indicator = three phase A C generator |
| Engine pressure ratio is determined by? | Dividing turbine outlet total pressure by engine inlet total pressure. Key words divid outlet by inlet total pressure |
| A bourdon tube instrument may be used to indicate? | 1 and 2 Key words 1. Pressure and 2. Temperature |
| An indication of unregulated power changes that result in continual drift of manifold pressure indication on a turbo supercharged aircraft engine is known as? | Bootstrapping Keywords continual drift in manifold pressure = bootstrapping |
| In what units are turbine engine tachometers calibrated? | Percent of engine R P M Key words tachometer calibrated = percent of engine R P M |
| What instrument indicates the thrust of a gas turbine engine? | Engine pressure ratio indicator Key words thrust indication = engine pressure ratio indicator |
| The fuel flow indication system used with many fuel injected opposed engine airplanes utilizes a measure of? | Fuel pressure |
| Which fire detector is commonly used in the power section of an engine nacelle? | Rate of temperature rise detectors Key words fire detector commonly used in power section = rate of temperature rise |
| A continuous-loop fire detector is what type of detector? | Overheat detector Key words continuous loop fire detector = overheat detector |
| What is the operating principle of the spot detector sensor in a fire detection system? | A bi-metallic thermoswitch that closes when heated to a high temperature Key words spot detector = bi metallic thermoswitch |
| How is the fire extinguishing agent distributed in the engine section? | Spray nozzles and perforated tubing Key words perforated tubing |
| Which fire extinguishing agent is considered to be the safest to use from a toxicity standpoint and correction hazards? | Bromotrifluoromethane (halon 1301) Key words halon 1301 |
| The most satisfactory extinguishing agent for tailpipe or intake fire is? | Carbon dioxide Key words most satisfactory extinguishing agent for tailpipe or intake fire = carbon dioxide |
| Which fire detection system measures temperature rise compared to a reference temperature? | Thermocouple Key words measures temperature rise = thermocouple |
| The fire detection system operates on the principal of a buildup of gas pressure within a tube proportional to temperature. Which of the following systems does this statement define? | Lindberg continuous element system Key words buildup of gas pressure within tube proportional to temperature = lindberg continuous element system |
| The fire detection system that uses a single wire surrounded by continuous string of ceramic beads in a tube is the? | Fenwal system Key words single wire surrounded by continuous string of ceramic beads in tube = fenwal system |
| The fire detection system that uses two wires embedded in a ceramic core within a tube is the? | Kidde system Key words two wires embedded in a ceramic core = kidde system |
| A fuel or oil fire is defined as a? | Class B fire Key words fuel or oil fire = class B fire |
| A fire involving energized electrical equipment is defined as a? | Class C fire Key words electrical fire = class C fire |
| Propeller fluid anti icing systems generally use which of the following? | Isopropyl alcohol Key words propeller anti icing fluid = isopropyl alcohol |
| What unit in the propeller anti icing system controls the output of the pump? | Rheostat Key words anti icing system that controls the output of the pump = rheostat |
| What is the purpose of an arbor used in balancing a propeller? | To support the propeller on the balance knives. Key words purpose of arbor used in balancing a propeller = balance knives |
| Propeller aerodynamic thrust imbalance can be be largely eliminated by? | Correct blade contouring and angle setting. Key words aerodynamic thrust imbalance = correct blade contouring and angle setting |
| Why is the pulley stop srew on a propeller governor adjustable? | To limit the max engine speed during takeoff Key words pulley stop screw = limits max engine speed during takeoff |
| When engine power is increased, the constant speed propeller tries to function so that it will? | Maintain the R P M, increase the blade angle, and maintain a low angle of attack Key words increase blade angle |
| The propeller governor control the? | Oil to and from the pitch changing mechanism Key words propeller governor = oil to and from pitch changing mechanism |
| What actuated the pilot valve in the governor of a constant speed propeller? | Governor flyweights Key words pilot valve actuation = governor flyweights |
| Propellers exposed to salt spray should be flushed with? | Fresh water Props exposed to salt = flush wit th fresh water |
| How can a steel propeller hub be tested for cracks? | By magnetic particle inspection Key words steel propeller hub testing for cracks = magnetic particle inspection |
| The actual distance a propeller moves forward through the air during one revolution is known as the ? | Effective pitch Key words actual distance a propeller moves forward through air = effective pitch |
| The blade angle of a fixed pitch propeller? | Smallest at the tip Key words blade angle of fixed pitch propeller = smallest at the tip |
| If a flanged propeller shaft has dowel pins? | The propeller can be installed in a given position Key words dowel pins = installed in a given position |
| Propeller blade angle is the angle between the? | Chord of blade and the rotational plane of the propeller. Key words propeller blade angle = chord of blade and rotational plane |
| An aircrafts propeller system beta range? | Is used to produce zero or negative thrust Key words beta range = used to produce zero or negative thrust |
| The purpose of a three way propeller valve is to? | Direct oil from the engine oil system to the propeller cylinder Key words propeller cylinder |
| Geometric pitch of propeller is defined as the? | Effective pitch plus slippage Key words geometric pitch = effective pitch plus slippage |
Created by:
Louischarleswali