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Recip. Final
| Question | Answer |
|---|---|
| GTSIO-520 indicates a geared | turbosupercharged, injected, opposed engine of 520in" cubic displacement |
| An in-line engine cylinder arrangement is one in which the cylinders of the engine are | arranged in a single row parallel to the crankshaft |
| A single-row radial engine has | an odd number of cylinders extending radially from the centerline of the crankshaft |
| Which of the following statements is true regarding bearings used in high-powered reciprocating aircraft engines | there is less rolling friction when ball bearings are used than when roller bearings are employed |
| Which of the following is the type of thrust bearing used in most radial engines | deep ball groove |
| Cam-ground pistons are installed in some aircraft engines to | provide better fit at operating temperatures |
| Some aircraft engine manufacturers equip their products with choked or taper-ground cylinders. Choke-type cylinders are used because they | provide a straight cylinder bore at operating temperatures |
| The insides of some cylinder barrels are hardened by | Nitriding |
| Full floating piston pins are those which allow motion between the pin and | both the piston and the small end of the connecting rod |
| The purpose of two or more valve springs in an aircraft engine is to | eliminate valve spring surge |
| Excessive valve clearance causes the valves to | open late close early |
| An advantage of using metallic sodium-filled exhaust valves in aircraft reciprocating engines is | reduce valve operating temperatures |
| The source most of the heat that is absorbed by the lubricating oil in a reciprocating engine is the | piston and cylinder walls |
| The way in which the oil collected by the piston ring is returned to the crankshaft is | through holes drilled in the piston oil ring groove |
| The horsepower developed in the cylinders of a reciprocating engine is known as | indicated horsepower |
| The 5 events of a four stroke cycle engine in order of their occurrence are | intake, compression, ignition, power, and exhaust |
| Valve overlap is defined as the number of degrees of the crankshaft travel | during which both valves are off their seats |
| If the exhaust valve of a four stroke cycle engine is closed and the intake is just closing, the piston is on the | compression stroke |
| Compression ratio is the ratio between | cylinder volume with piston at bottom dead center and cylinder volume with piston at top dead center |
| The primary concern in establishing the firing order for an opposed engine is to | provide balance and eliminate vibration to the greatest extent possible |
| On which stroke or strokes are both valves on a four stroke cycle reciprocating engine cylinder open | exhaust and intake |
| The actual power delivered to the propeller of an aircraft engine is called | brake horsepower |
| if the intake valve is opened to early in the operation of a four stroke cycle engine, it may result in | backfiring into the induction system |
| When is the fuel air mixture ignited in a conventional reciprocating engine | shortly before the piston reaches the top of the compression stroke |
| The great portion of heat generated by combustion in a typical reciprocating aircraft engine is | carried out with the exhaust gases |
| Which of the following results in a decrease in volumetric efficiency | part throttle operation |
| Increased engine heat will cause volumetric efficiency to | decrease |
| The indicated oil pressure of a particular dry sump aircraft engine is higher at cruise rpm than at idle rpm. This indicates. | Normal operation |
| If the oil pressure of an engine is higher when the engine is cold that it is at normal operating temperatures | the engines lubrication system is probably operating normally |
| The viscosity of a liquid is a measure of its | resistance to flow |
| An engines lubricating oil aids in reducing friction, cushioning shock, and | cooling engine |
| Which if the following factors determines the proper grade of oil to use in a particular engine | operating speeds of bearings |
| Lubricants may be classified according to their origins. Satisfactory aircraft engine lubricants are | Mineral or synthetic based |
| What type of oil do most engine manufactures recommend for new reciprocating engine break in | ashless dispersant oil |
| what type of oil do most engine manufactures recommend after new reciprocating engine break in | straight mineral oil |
| what unit in an aircraft engine lubrication system is adjusted to maintain the desired system pressure | oil pressure relief valve |
| in order to relieve excessive pump pressure in an engines internal oil system, most engines are equipped with a | relief valve |
| what is the purpose of the check valve generally used in a dry sump lubricating system | to prevent the oil from the supply tank from seeping into the crankcase during inoperative periods |
| Cylinder walls are usually lubricated by | splashed or sprayed oil |
| what is the primary reason for changing aircraft lubricating oil at predetermined periods | the oil becomes contaminated with moisture, acids, and finely divided suspended solid particles |
| what will result if an oil filter screen becomes completely blocked | oil will flow at the normal rate through the system |
| in a reciprocating engine, oil is directed from the pressure relief valve to the inlet side of the | pressure pump |
| the main oil filters strain the oil at which point in the system | just as it leaves the pressure pump |
| carburetor icing may be eliminated by which of the following methods | alcohol spray and heated induction air |
| As manifold pressure increases in a reciprocating engine | the density of air in the cylinder increases |
| boost manifold pressure is generally considered to be any manifold pressure above | 30inHG |
| what directly regulates the speed of a turbosupercharger | waste gate |
| what is the purpose of a turbocharger system for a small reciprocating aircraft engine | to compress air to hold manifold pressure constant from sea level to the critical altitude of the engine |
| what is used to drive an externally driven supercharger | exhaust gases driving a turbine |
| on small aircraft engines, fuel vaporization may be increased by | circulating the fuel air mixture through passages in the oil sump |
| a carburetor preheater is not generally used on takeoff, unless absolutely necessary because of the | resulting loss of power and possible detonation |
| the purpose of an intercooler when used with a turbocharger is to | cool the air entering the carburetor from the turbocharger |
| why is high nickel chromium steel used in many exhaust system | corrosion resistance and low expansion coefficient |
| what type of nuts are used to hold an exhaust system to the cylinders | brass or special locknuts |
| A reciprocating engine automatic mixture control responds to changes in air density causes by changings in | altitude or temperatures |
| on a float type carburetor, the purpose of the economizer valve is to | provide a richer mixture and fuel cooling at maximum power output |
| which method is commonly used to adjust the level of a float type carburetor | adding or removing shims under the needle valve seat |
| a punctured float in a float type carburetor will | raise the fuel level and enrich the mixture |
| if a float type carburetor becomes flooded, the condition is most likely to have been caused by | a leaking needle valve and seat assembly |
| the fuel level within the float chamber of a properly adjusted float type carburetor will be | slightly lower than the discharge nozzle outlet |
| what carburetor component measures the amount of air delivered to the engine | venturi |
| when air passes through the venturi of a carburetor, what three changes occur | velocity increases, temperatures decreases, and pressure decreases |
| where is the throttle valve located in a float type carburetor | after the main discharge nozzle and venturi |
| an aircraft carburetor is equipped with a mixture control in order to prevent | the mixture from becoming too rich at high altitudes |
| which of the following is not a function of the carburetor venturi | regulation of the idle system |
| what component is used to ensure fuel delivery during periods of rapid engine accleration | acceleration pump |
| the device that controls the ratio of the fuel air mixture delivered to the cylinders is called | a mixture control |
| on a carburetor without an automatic mixture control, as the aircraft ascends to altitude, the mixture will | be enriched |
| 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 |
| on a twin engine aircraft with fuel injected reciprocating engines, one fuel flow indicator reads considerably higher than the other in all of the engine operating configurations. What is the probable cause of this indication? | one or more fuel nozzles are clogged |
| the fuel flow indication system used on most aircraft with fuel injected opposed engines utilizes a measure of | fuel pressure drop |
| the rotary vane pump is best described as | a positive displacement pump |
| fuel pressure produced by the engine driven fuel pump is adjusted by the | relief valve adjusting screw |
| where would a carburetor air heater be located in a fuel injection system | none is required |
| the E-gap angle is usually defined as the number of degrees between the neutral position of the rotating magnet and the position | where the contact points are open |
| magneto breaker point opening relative to the position of the rotating magnet and distributor rotor (internal timing) can be set most accurately | during assemble of the magneto before installation on the engine |
| what is the purpose of a safety gap in some magnetos | to discharge the secondary coil's voltage if an open occurs in the secondary circuit |
| when a magneto is being timed internally, the alignment of the timing marks indicates that | the magnets are in the E-gap position |
| when a magneto is being timed internally, the breaker points begin to open when the rotating magnet is | a few degrees past the neutral position |
| what is the electrical location of the primary condenser in a high tension magneto | across the breaker points |
| in a high-tension ignition system, the current in the magneto secondary winding is | induced when the primary circuit is interrupted |
| when a shower of sparks ignition system is activated at an engine start, a spark plug fires | only while both the retard and advance breaker points are open |
| magneto pole shoes are generally made of | laminations of high grade soft iron |
| capacitance after firing in most modern spark plugs is reduced by the use of | a built in resistor in each plug |
| in an aircraft ignition system, one of the functions of the condenser is to | facilitate a more rapid collapse of the charge in the primary coil |
| a magneto ignition switch is connected | parallel to the breaker points |
| the spark plug is produced in a magneto ignition system when the break points are | beginning to open |
| failure of an engine to cease firing after the magneto switch has been turned off is an indication of | an open in the low tension lead to ground |
| in a low tension ignition system, each spark plug requires an individual | secondary coil |
| what will be the result of using an excessively hot spark plug | preignition |
| a spark plug is fouled when | its spark grounds without jumping electrodes |
Created by:
Tiana Arch