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2201 The Final Peter
| Question | Answer |
|---|---|
| GTSIO-520 indicates what? | Geared, turbosupercharged, injected, opposed engine of 520 in cubic displacement |
| An in-line engine is | when the cylinders are arranged in a single row parallel to the crankshaft |
| What does a single-row radial engine have | An odd number of cylinders extending radially from the center-line of the crankshaft |
| There is less rolling friction when ball bearings are used than when roller bearings are used. | True |
| What type of thrust-bearing are used most in radial engines? | Deep grove ball |
| Cam-ground pistons are installed in some aircraft engines to | provide a better fit at operating temperatures |
| Why are choke-type cylinders used? | Provide a straight bore at operating temperatures |
| How are the insides of some cylinder barrels hardened? | Nitriding |
| Full floating piston pins are those which allow motion between the pin and ________ | both the piston and small end of the connecting rod |
| The purpose of 2 or more valve springs in an aircraft engine is to ________ | eliminate valve spring surge |
| Excessive valve clearance causes the valves to_______ | open late and close early |
| What is an advantage of using metallic sodium-filled exhaust valves in aircraft reciprocating engine? | Reduced valve operating temperatures |
| What is the source of most of the heat that is absorbed by the lubricating oil in a reciprocating engine? | Piston and cylinder walls |
| How is oil collected by the piston ring returned to the crankcase? | Through holes drilled into the piston oil ring groove |
| What is indicated horsepower? | The horsepower developed in the cylinders of a reciprocating engine |
| What are the 5 events of a four stroke engine? | 1) intake 2)compression 3)ignition 4) power 5) exhaust |
| What is valve overlap? | The number of degrees of crankshaft travel during which both valves are off their seats |
| If the exhaust valve of a 4 stroke engine is closed and the intake is just closing, which stroke is the piston on? | Compression |
| What is the compression ratio? | The ratio between cylinder volume with piston at bottom dead center and cylinder volume with piston at top dead center |
| What is the primary concern in establishing the firing order for an opposed engine? | Provide balance and eliminate vibration to the greatest extent possible |
| On which stroke are both valves on a four stroke engine cylinder open? | Exhaust |
| What is the actual power delivered to the propeller of an aircraft engine called? | Brake horsepower |
| If the intake valve is opened too early in the operation of a four stroke cycle engine, what can it 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 greatest portion of heat generated by combustion in a typical reciprocating aircraft engine is _______ | carried out with the exhaust gases |
| What results in a decrease in volumetric efficiency? | Part throttle operation |
| What does increased engine heat cause volumetric efficiency to do? | 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 than 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 the engine |
| What factors determine 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 manufacturers recommend for new 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 |
| What unit in an aircraft engine lubrication system is adjusted to maintain the desired system pressure? | Oil pressure relief valves |
| What are most engines equipped with in order to relieve excessive pump pressure in an engines internal oil system? | Relief valve |
| What is the purpose of the check valve generally used in 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 engine 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 |
| 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 |
| What directly regulates the speed of a turbosupercharger? | Waste gate |
| Boost manifold pressure is generally considered to be any manifold pressure above _______ | 30 inHG |
| What is the purpose of a turbocharge system for a small reciprocating aircraft engine? | To compress the 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? | Engine oil pressure |
| 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 ________ | resulting loss of power and possible detonation |
| The purpose of an inter-cooler 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 systems? | 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 cause by changes in ______ | altitude or temperature |
| On a float-type carburetor, the purpose of the economizer value 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 in 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 cause 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 3 changes occur | Velocity increases, temperature 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 acceleration? | Acceleration pump |
| The device that controls the ratio of the fuel air mixture delivered to the cylinders is called what? | 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 nozzle body |
| On a twin engine aircraft with fuel injected reciprocating engines, one fuel flow indicator reads higher than the other in all engine operating configurations. What is the probable cause? | One or more fuel nozzles 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 open |
| Magneto breaker point opening relative to the position of the rotating magnet and distributor rotor can be set more accurately __________ | during assembly of the magneto before installation of 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 afterfiring 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 is produced in a magneto ignition system when the breaker 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 the 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:
mattpayne001