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! ! Set 8

set 8 PowerPlant

QuestionAnswer
001 The purpose of a dwell chamber in a turbine engine oil tank is to provide [AMP-G-091] for a pressurized oil supply to the oil pump inlet. a collection point for sediments. separation of entrained air from scavenged oil. separation of entrained air from scavenged oil.
002 Which of the following bearing types must be continuously lubricated by pressure oil? [AMP-G-092] Ball. Roller. Plain. Plain.
003 (1) Wet sump oil systems are most commonly used in gas turbine engines. (2) In most turbine engine oil tanks, a slight pressurization of the tank is desired to ensure a positive flow of oil. Regarding the above statements [AMP-G-068] both 1 and 2 are true. only 2 is true. only 1 is true. only 2 is true.
004 What is the purpose of the check valve generally used in a dry sump lubrication system? [AMP-G-051] To prevent the scavenger pump from losing its prime. To prevent the oil from the supply tank from seeping into the crankcase during inoperative periods. To prevent the oil from the pressure pump from entering the scavenger system. To prevent the oil from the supply tank from seeping into the crankcase during inoperative periods.
005 Why is an aircraft reciprocating engine oil tank on a dry sump lubrication system equipped with a vent line? [AMP-G-066] To prevent pressure buildup in the oil tank. To prevent pressure buildup in the reciprocating engine crankcase. To eliminate foaming in the oil tank. To prevent pressure buildup in the oil tank.
006 The pumping capacity of the scavenger pump in a dry sump aircraft engine's lubrication system [AMP-G-069] is less than the capacity of the oil supply pump. is usually equal to the capacity of the oil supply pump in order to maintain constant oiling conditions. is greater than the capacity of the oil supply pump. is greater than the capacity of the oil supply pump.
007 A turbine engine dry sump lubrication system of the self-contained, high-pressure design [AMP-G-074 stores oil in the engine crankcase. consists of pressure, breather, and scavenge subsystems. has no heat exchanger. consists of pressure, breather, and scavenge subsystems.
008 The vent line connecting the oil supply tank and the engine in some dry sump engine installations permits [AMP-G-077] pressurization of the oil supply to prevent cavitation of the oil supply pump. oil vapors from the engine to be condensed and drained into the oil supply tank. the oil tank to be vented through the normal engine vent. the oil tank to be vented through the normal engine vent.
009 Where is the oil of a dry sump reciprocating engine exposed to the temperature control valve sensing unit? [AMP-G-079] Oil cooler inlet. Engine inlet. Engine outlet. Oil cooler inlet.
010 Possible failure related ferrous-metal particles in turbine engine oil cause an (electrical) indicating-type magnetic chip detector to indicate their presence by [AMP-G-040] generating a small electric current that is caused by the particles being in contact with the dissimilar metal of the detector tip. disturbing the magnetic lines of flux around the detector tip. bridging the gap between the detector center (positive) electrode and the ground electrode. bridging the gap between the detector center (positive) electrode and the ground electrode.
011 As a general rule, a small amount of small fuzzy particles or gray metallic paste on a turbine engine magnetic chip detector [AMP-G-089] is considered to be the result of normal wear. indicates accelerated generalized wear. indicates an imminent component failure. is considered to be the result of normal wear.
012 Manufacturers typically require turbine engine oil servicing within a short time after engine shutdown primarily to [AMP-G-019] prevent overservicing. help dilute and neutralize contaminants that may already be present in the engine's oil system. provide a better indication of any oil leaks in the system. prevent overservicing.
013 After making a welded repair to a pressurized-type turbine engine oil tank, the tank should be pressure checked to [AMP-G-038] not less than 5 psi plus the average operating pressure of the tank. not less than 5 psi plus the maximum operating pressure of the tank. 5 psi. not less than 5 psi plus the maximum operating pressure of the tank.
014 What would be the probable result if the oil system pressure relief valve should stick in the open position on a turbine engine? [AMP-G-041] Increased oil pressure. Insufficient lubrication. Decreased oil temperature. Insufficient lubrication.
015 Low oil pressure can be detrimental to the internal engine components. However, high oil pressure [AMP-G-044] should be limited to the engine manufacturer's recommendations. will not occur because of pressure losses around the bearings. has a negligible effect. should be limited to the engine manufacturer's recommendations.
016 If an oil filter element becomes completely clogged, the [AMP-G-059] oil flow to the engine will be restricted. oil will be bypassed back to the oil tank. bypass valve will open, and the oil pump will supply unfiltered oil. bypass valve will open, and the oil pump will supply unfiltered oil.
017 What is the primary purpose of changing aircraft engine lubricating oils at predetermined periods? [AMP-G-061] The oil becomes diluted with gasoline washing past the pistons into the crankcase. Exposure to heat and oxygen causes a decreased ability to maintain a film under load. The oil becomes contaminated with moisture, acids, and finely divided suspended solid particles. The oil becomes contaminated with moisture, acids, and finely divided suspended solid particles.
018 Last-chance filters in the lube system turbine engines are usually cleaned [AMP-G-075] during annual inspection. during overhaul. during 100-hour inspections. during overhaul.
019 In an aircraft ignition system, one of the functions of the capacitor is to [AMP-H-019] facilitate a more rapid collapse of the magnetic field in the primary coil. stop the flow of magnetic lines of force when the points open. regulate the flow of current between the primary and secondary coil. facilitate a more rapid collapse of the magnetic field in the primary coil.
020 When the switch is off in a battery ignition system, the primary circuit is [AMP-H-021] grounded. opened. shorted. opened.
021 How many secondary coils are required in a low-tension ignition system on an 18-cylinder engine? [AMP-H-026] 36 18 9 36
022 The spark is produced in a magneto ignition system when the breaker points are [AMP-H-028] beginning to open. fully closed. fully open. beginning to open.
023 Shielding is used on spark plug and ignition wires to [AMP-H-029] prevent interference with radio reception. prevent outside electromagnetic emissions from disrupting the operation of the ignition system. protect the wires from short circuits as a result of chafing or rubbing. prevent interference with radio reception.
024 The purpose of staggered ignition is to compensate for [AMP-H-031] rich fuel/air mixture around exhaust valve. short ignition harness. diluted fuel/air mixture around exhaust valve. diluted fuel/air mixture around exhaust valve.
025 What is the difference between a low-tension and a high-tension engine ignition system? [AMP-H-036] -A high-tension system is designed for high-altitude aircraft, while a low-tension system is for low- to medium-altitude aircraft. -A low-tension system produces relatively low voltage at the spark plug as compared to a high-tension system. -A low-tension system uses a transformer coil near the spark plugs to boost voltage, while the high-tension system voltage is constant from the magneto to the sp A low-tension system uses a transformer coil near the spark plugs to boost voltage, while the high-tension system voltage is constant from the magneto to the spark plugs.
026 What test instrument could be used to test an ignition harness for suspected leakage? [AMP-H-037] A high voltage dc voltmeter. A high amperage dc ammeter. A high-tension lead tester. A high tension lead tester.
027 Which of the following breaker point characteristics is associated with a faulty capacitor? [AMP-H-049] Coarse grained. Crowned. Fine grained. Coarse grained.
028 Thermocouples are usually inserted or installed on the [AMP-H-051] rear cylinder of the engine. front cylinder of the engine. hottest cylinder of the engine. hottest cylinder of the engine.
029 If it is found that a shielded ignition system does not adequately reduce ignition noise, it may be necessary to install [AMP-H-053] bonding wires from the shielding to ground. a filter between the magneto and magneto switch. a second layer of shielding. a filter between the magneto and magneto switch.
030 If staggered ignition timing is used, the [AMP-H-071] spark will be automatically advanced as engine speed increases. spark plug nearest the intake valve will fire first. spark plug nearest the exhaust valve will fire first. spark plug nearest the exhaust valve will fire first.
031 The term 'reach,' as applied to spark plug design and/or type, indicates the [AMP-H-072] length of the shielded barrel. linear distance from the shell gasket seat to the end of the threads on the shell skirt. length of center electrode exposed to the flame of combustion. linear distance from the shell gasket seat to the end of the threads on the shell skirt.
032 The numbers appearing on the ignition distributor block indicate the [AMP-H-073] firing order of the engine. relation between distributor terminal numbers and cylinder numbers. sparking order of the distributor. sparking order of the distributor.
033 When does battery current flow through the primary circuit of a battery ignition coil? [AMP-H-080] Only when the breaker points are open. At all times when the ignition switch is on. When the breaker points are closed and the ignition switch is on. When the breaker points are closed and the ignition switch is on.
034 In a four-stroke cycle aircraft engine, when does the ignition event take place? [AMP-H-093] After the piston reaches TDC on power stroke. After the piston reaches TDC on compression stroke. Before the piston reaches TDC on compression stroke. Before the piston reaches TDC on compression stroke.
035 Ignition check during engine runup indicates a slow drop in RPM. This is usually caused by [AMP-H-097] a defective high-tension lead. incorrect ignition timing or valve adjustment. defective spark plugs. incorrect ignition timing or valve adjustment.
036 How does high-tension ignition shielding tend to reduce radio interference? [AMP-H-100] Reduces voltage drop in the transmission of high-tension current. Receives and grounds high-frequency waves coming from the magneto and high-tension ignition leads. Prevents ignition flashover at high altitudes. Receives and grounds high-frequency waves coming from the magneto and high-tension ignition leads.
037 What are two parts of a distributor in an aircraft engine ignition system? [AMP-H-102] Block and rotor. Block and coil. Coil and rotor. Block and rotor.
038 What is a result of 'flashover' in a distributor? [AMP-H-103] Intense voltage at the spark plug. Conductive carbon trail. Reversal of current flow. Conductive carbon trail.
039 What is the relationship between distributor and crankshaft speed of aircraft reciprocating engines? [AMP-H-104] The distributor turns at one-half crankshaft speed. The crankshaft turns at one-half distributor speed. The distributor turns at one and one-half crankshaft speed. The distributor turns at one-half crankshaft speed.
040 At what RPM is a reciprocating engine ignition switch check made? [AMP-H-107] Full throttle RPM. 1,700 RMP. The slowest possible RPM. The slowest possible RPM.
041 Why are high-tension ignition cables frequently routed from the distributors to the spark plugs in flexible metallic conduits? [AMP-H-006] To reduce the formation of corona and nitric oxide on the cable insulation. To reduce the effect of the high-frequency electromagnetic waves emanated during operation. To eliminate high altitude flashover. To reduce the effect of the high-frequency electromagnetic waves emanated during operation.
042 Capacitance after firing in most modern spark plugs is reduced by the use of [AMP-H-017] aluminum oxide insulation. fine wire electrodes. a built-in resistor in each plug. a built-in resistor in each plug.
043 In a low-tension ignition system, each spark plug requires an individual [AMP-H-042] capacitor. breaker assembly. secondary coil. secondary coil.
044 What will be the effect if the spark plugs are gapped too wide? [AMP-H-044] Lead damage. Insulation failure. Hard starting. Hard starting.
045 When removing a shielded spark plug, which of the following is most likely to be damaged? [AMP-H-045] Shell section. Core insulator. Center electrode. Core insulator.
046 How are most radial engine spark plug wires connected to the distributor block? [AMP-H-050] By use of terminal sleeves and retaining nuts. By use of cable-piercing screws. By use of self-locking cable ferrules. By use of cable-piercing screws.
047 Capacitance after firing of a spark plug is caused by [AMP-H-052] excessive center electrode erosion. constant polarity firing. the stored energy in the ignition shielded lead unloading after normal timed ignition. the stored energy in the ignition shielded lead unloading after normal timed ignition.
048 The electrical circuit from the spark plug back to the magneto is completed by grounding through the [AMP-H-061] engine structure. P-lead. cockpit switch. engine structure.
049 Spark plugs are considered worn out when the [AMP-H-062] electrodes have worn away to about two-thirds of their original dimensions. center electrode edges have become rounded. electrodes have worn away to about one-half of their original dimensions. electrodes have worn away to about one-half of their original dimensions.
050 Which of the following could cause damage to the nose ceramic or to the electrode of an aircraft spark plug? [AMP-H-063] Plug installed without a copper gasket. Improper gapping procedure. Excessive magneto voltage. Improper gapping procedure.
051 A spark plug's heat range is the result of [AMP-H-070] its ability to transfer heat from the firing end of the spark plug to the cylinder head. the area of the plug exposed to the cooling airstream. the heat intensity of the spark. its ability to transfer heat from the firing end of the spark plug to the cylinder head.
052 (1) The platinum and iridium ground electrodes used on fine wire spark plugs are extremely brittle and can be broken if they are improperly handled or adjusted. (2) When gapping massive-electrode spark plugs, a wire gauge should be inserted between the center and ground electrodes while moving the ground electrode in order to avoid setting the gap too close. Regarding the above statements [AMP-H-075] only 2 is true. only 1 is true. both 1 and 2 are true. only 1 is true.
053 If a spark plug lead becomes grounded, the [AMP-H-077] magneto will not be affected. capacitor will break down. distributor rotor finger will discharge to the next closest electrode within the distributor. magneto will not be affected.
054 Defective spark plugs will cause the engine to run rough [AMP-H-083] during cruise. at all speeds. during run up. at all speeds.
055 A spark plug is fouled when [AMP-H-084] its spark grounds by jumping electrodes. it causes preignition. its spark grounds without jumping electrodes. its spark grounds without jumping electrodes.
056 Which of the following would be cause for rejection of a spark plug? [AMP-H-085] Insulator tip cracked. Carbon fouling of the electrode and insulator. Lead fouling of the electrode and insulator. Insulator tip cracked.
057 What will be the result of using too hot of a spark plug? [AMP-H-086] Fouling of plug. Preignition. Burned capacitor. Preignition.
058 Upon inspection of the spark plugs in an aircraft engine, the plugs were found caked with a heavy black soot. This indicates [AMP-H-087] a lean mixture. worn oil seal rings. a rich mixture. a rich mixture.
059 Spark plug heat range is determined by [AMP-H-088] the number of ground electrodes. its ability to transfer heat to the cylinder head. the reach of the spark plug. its ability to transfer heat to the cylinder head.
060 Using a cold spark plug in a high-compression aircraft engine would probably result in [AMP-H-091] normal operation. detonation. a fouled plug. normal operation.
061 Spark plug fouling caused by lead deposits occurs most often [AMP-H-092] during cruise with rich mixture. when cylinder head temperatures are relatively low. when cylinder head temperatures are high. when cylinder head temperatures are relatively low.
062 When a 'Shower of Sparks' ignition system is activated at an engine start, a spark plug fires [AMP-H-014] as soon as the advance breaker points open. only while both the retard and advance breaker points are open. only while both the retard and advance breaker points are closed. only while both the retard and advance breaker points are open.
063 In reference to a 'Shower of Sparks' ignition system, (1) the retard breaker points are designed to keep the affected ignition system operating if the advance breaker points should fail during normal engine operation (after start). (2) the timed opening of the retard breaker points is designed to prevent engine 'kickback' during start. Regarding the above statements [AMP-H-040] both 1 and 2 are true. only 2 is true. only 1 is true. only 2 is true.
064 Which of the following, obtained during magneto check at 1,600 RPM, indicates a short (grounded) circuit between the right magneto primary and the ignition switch? [AMP-H-066] BOTH -- 1,600 RPM, R -- 0 RPM, L -- 1,600 RPM, OFF -- 0 RPM. BOTH -- 800 RPM, R -- 0 RPM, L -- 750 RPM, OFF -- 0 RPM. BOTH -- 1,600 RPM, R -- 1,525 RPM, L -- 1,600 RPM, OFF -- 1,525 RPM. BOTH -- 1,600 RPM, R -- 0 RPM, L -- 1,600 RPM, OFF -- 0 RPM.
065 If an aircraft ignition switch is turned off and the engine continues to run normally; the trouble is probably caused by [AMP-H-067] arcing magneto breaker points. an open ground lead in the magneto. primary lead grounding. an open ground lead in the magneto.
066 When the ignition switch of a single (reciprocating) engine aircraft is turned to the OFF position [AMP-H-069] the primary circuits of both magnetos are grounded. the secondary circuits of both magnetos are opened. all circuits are automatically opened. the primary circuits of both magnetos are grounded.
067 Which of the following statements regarding magneto switch circuits is NOT true? [AMP-H-078] In the BOTH positions, the right and left magneto circuits are grounded. In the RIGHT position, the right magneto circuit is open, and the left magneto circuit is grounded. In the OFF position, neither the right nor left magneto circuits are open. In the BOTH position, the right and left magneto circuits are grounded.
068 Sharp bends should be avoided in ignition leads primarily because [AMP-H-064] ignition lead shielding effectiveness will be reduced. weak points may develop in the insulation through which high tension current can leak. ignition lead wire conductor material is brittle and may break. weak points may develop in the insulation through which high tension current can leak.
069 In a high-tension ignition system, a primary capacitor of too low a capacity will cause [AMP-H-065] excessive primary voltage. excessively high secondary voltage. the breaker contacts to burn. the breaker contacts to burn.
070 When testing a magneto distributor block for electrical leakage, which of the following pieces of test equipment should be used? [AMP-H-074] A high-tension harness tester. A high-range ammeter. A continuity tester. A high-tension harness tester.
071 What is the approximate position of the rotating magnet in a high-tension magneto when the points first close? [AMP-H-108] A few degrees after neutral. Full register. Neutral. Full register.
072 (Refer to Figure 5.) With power applied to the bus bar, what wire supplies standby power to the starter relay contact? [AMP-H-132] 7 4 8 4.
073 (Refer to Figure 5.) With power applied to the bus bar, what switch changes will allow the ignition exciters test switch to function? [AMP-H-113] Engine master switch and ignition switch. Engine master switch, battery switch, and power lever switch. Engine master switch, start switch, and test switch. Engine master switch and ignition switch.
074 (Refer to Figure 5.) The type of system depicted is capable of operating with [AMP-H-114] either battery or external power. battery power and external power simultaneously. external power only. either battery or external power.
075 (Refer to Figure 5.) If wire 8 is broken or disconnected after starter rotation is initiated, and the power lever is advanced, the [AMP-H-115] starting sequence will continue normally. starting sequence will discontinue. starter will shut down, but the igniters will continue to fire. starting sequence will continue normally.
076 (Refer to Figure 5.) When an external power source is connected to the aircraft, [AMP-H-116] both battery power and external power are available to the bus. the battery cannot be connected to the bus. the starter relay coil has a path to ground. the battery cannot be connected to the bus.
077 The purpose of an undercurrent relay in a starter-generator system is to [AMP-H-117] keep current flow to the starter-generator under the circuit capacity maximum. provide a backup for the starter relay. disconnect power from the starter-generator and ignition when sufficient engine speed is reached. disconnect power from the starter-generator and ignition when sufficient engine speed is reached.
078 In a typical starter-generator system, under which of the following starting circumstances may it be necessary to use the start stop button? [AMP-H-118] Hot start. Contacts stick open. Hung start. Hung start.
079 In the event a pneumatic start valve will not operate, and the manual override must be used, the starter T-handle must be closed at scheduled starter drop out because [AMP-H-131] the starter will overheat. the starter oil will be blown overboard. the starter will overspeed at a given N(2). the starter will overspeed at a given N(2).
080 (Refer to Figure 5.) Which malfunctions will allow the igniters to operate when tested but be inoperative during a start attempt? [AMP-H-119] -- Wire 12 and 11 are broken. Wire 10 is broken and/or the ignition relay is inoperative. Wire 11 is broken and/or the ignition relay is inoperative. Wire 10 is broken and/or the ignition relay is inoperative.
081 (Refer to Figure 5.) Which malfunctions will allow the igniters to operate normally during start but be inoperative when tested? [AMP-H-120] Wire 12 is broken. Wire 14 or 15 is broken. Wire 10 is broken. Wire 14 or 15 is broken.
082 When using an electric starter motor, current usage [AMP-H-121] is highest just before starter cutoff (at highest RPM). remains relatively constant throughout the starting cycle. is highest at the start of motor rotation. is highest at the start of motor rotation.
083 When using an electric starter motor, the current flow through it [AMP-H-122] is highest at the start of motor rotation. is highest just before starter cutoff (at highest RPM). remains relatively constant throughout the starting cycle. is highest at the start of motor rotation.
084 A clicking sound heard at engine coast-down in a pneumatic starter incorporating a sprag clutch ratchet assembly is an indication of [AMP-H-124] one or more broken pawl springs. the pawls re-contacting and riding on the ratchet gear. gear tooth and/or pawl damage. the pawls re-contacting and riding on the ratchet gear.
085 Pneumatic starters are usually designed with what types of airflow impingement systems? [AMP-H-125] Centrifugal compressor and axial-flow compressor. Radial inward flow turbine and axial-flow turbine. Double entry centrifugal outward flow and axial-flow turbines. Radial inward flow turbine and axial-flow turbine.
086 Inspection of pneumatic starters by maintenance technicians usually includes checking the [AMP-H-126] oil level and magnetic drain plug condition. rotor alignment. stator and rotor blades for FOD. oil level and magnetic drain plug condition.
087 Airflow to the pneumatic starter from a ground unit is normally prevented from causing starter overspeed during engine start by [AMP-H-128] a preset timed cutoff of the airflow at the source. activation of a flyweight cutout switch. stator nozzle design that chokes airflow and stabilizes turbine wheel speed. activation of a flyweight cutout switch.
088 A safety feature usually employed in pneumatic starters that is used if the clutch does not release from the engine drive at the proper time during start is the [AMP-H-129] drive shaft shear point. spring coupling release. flyweight cutout switch. drive shaft shear point.
089 The magnetic circuit of a magneto consists of a permanent multi-pole rotating magnet. The core is made of [AMP-H-001] hard steel. soft iron. electrical steel. soft iron.
090 How is the strength of a magneto magnet checked? [AMP-H-002] Check the output of the secondary coil with an ac ammeter while operating the magneto at a specified speed. Hold the points open and check the output of the primary coil with an ac ammeter while operating the magneto at a specified speed. Check the ac voltage reading at the breaker points. Hold the points open and check the output of the primary coil with an ac ammeter while operating the magneto at a specified speed.
091 The E-gap angle is usually defined as the number of degrees between the neutral position of the rotating magnet and the position [AMP-H-003] of greatest magnetic flux density. where the contact points close. where the contact points open. where the contact points open.
092 The greatest density of flux lines in the magnetic circuit of a rotating magnet-type magneto occurs when the magnet is in what position? [AMP-H-004] A certain angular displacement beyond the neutral position, referred to as E-gap angle or position. Full alignment with the field shoe faces. The position where the contact points open. Full alignment with the field shoe faces.
093 Magneto breaker point opening relative to the position of the rotating magnet and distributor rotor (internal timing) can be set most accurately [AMP-H-005] during the magneto-to-engine timing operation. during assembly of the magneto before installation on the engine. by setting the points roughly at the required clearance before installing the magneto and then making the fine breaker point adjustment after installation to compensate for wear in the magneto drive train. during assembly of the magneto before installation on the engine.
094 What will be the result of increasing the gap of the breaker points in a magneto? [AMP-H-007] Retard the spark and increase its intensity. Advance the spark and decrease its intensity. Retard the spark and decrease its intensity. Advance the spark and decrease its intensity.
095 The secondary coil of a magneto is grounded through the [AMP-H-111] primary coil. ignition switch. ground side of the breaker points. primary coil.
096 When internally timing a magneto, the breaker points begin to open when [AMP-H-023] the magnet poles are a few degrees beyond the neutral position. the magnet poles are fully aligned with the pole shoes. the piston has just passed TDC at the end of the compression stroke. the magnet poles are a few degrees beyond the neutral position.
097 The purpose of a safety gap in a magneto is to [AMP-H-024] prevent burning of contact points. protect the high-voltage winding from damage. prevent burning out the primary winding. protect the high-voltage winding from damage.
Created by: sampizzuto
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