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Eng. Reciprocrating
FAA AMP
| Question | Answer |
|---|---|
| What will be the likelt result if the piston ring gaps happen to be aligned when performing a differential pressure compression check on a cylinder? | a worn or defective ring(s) indication |
| when is the fuel/air mixture ignited in a conventional reciprocrating engine? | Shortly before the piston reaches the top of the compression stroke |
| a hissing sound from the exhaust stacks when the propeller is being pulled through manually indicates | exhaust valve blow by |
| increased water vapor (higher relative humidity) in the incoming air to a reciprocating engine will normally result in which of the following? | Decreased engine power at a constant RPM and manifold pressure |
| which of the following would most likely cause a reciprocating engine to backfire through the induction system at low RPM? | Lean mixture |
| the valve clearance of an engine using hydraulic lifters, when the lifters are completly flat, or empty, should not exceed | a pecified amount above zero. |
| during routine inspection of a reciprocating engine, a deposit of small, bright, metallic particles which do not cling to magnetic drain plug is discovered in the oil sump and on the surface of the oil filter. this condition | may be a result of abnormal plain type bearing wear and is a cause for further investigation |
| what is likely to occur if a reciprocating engine is operated at high power settings before it is properly warmed up? | oil starvation of bearings and other parts |
| reduced air density at high altitude has a decided effect on carburator, resulting in a reduction of engine power by | excessively enriching the fuel/air mixture |
| if the intake valve is opened too early in a cycle of operation of a four-stroke cycle engine, it may result in | backfiring into the induction systems |
| what is the basic operational sequence for reducing the power output of an engine equpped with a constant-speed propeller? | reduce the manifold pressure, then the RPM |
| during overhaul, the disassembled parts of an engine are usually degreased with some form of mineral spirits solvent rather than water-mixed degreasers primarly becuase | water-mixed degreaser residues may cause engine oil contamination in the overhauled engine |
| to what altitude will a turbo charged engine maintain sea level pressure? | critical altitude |
| what could cause excessive pressure builup in the crankcase of a reciprocating engine? | plugged crankcase breather |
| standard aircraft cylinder oversizes usually range from .010 inch to .030. oversize on automobile engine cylinders may range up to .100, this is beause aircraft engine cylinders | Have relatively thin walls and may be nitrided |
| which of the following is a characteristic of a thrust bearing used in most radial engines? | deep-groove ball. |
| what is the purpose of a power check on a reciprocating engine? | to determine satisfactory performance |
| during the inspection of an engine control system in which push-pull control rods are used, the threaded rod ends should | be checked for amount of thread engage,ent by means of the inspection holes |
| before attempting to start a radial engine that has been shut down for more than 30 minutes, | turn the propeller by hand three to four revolutions in the normal direction of rotation to check for liquid lock |
| if the crankshaft runout readings on the dial indicator are +.002 and -.003, the runout is | 0.005 inch |
| is least likely to be a roller or ball bearing? | master rod bearing (radial engine) |
| one cause of afterfiring in anb aircraft engine is | an excessively rich mixture |
| an increase in manifold pressure with a constant RPM will cause the bearing load in an engine to | increase |
| on which part of the cylinder walls of a normally operating engine will the greatest amount of wear occur? | near the top of the cylinders |
| if fuel/air ratio is proper and ignition timing is correct, the combustion process should b completed | just after top center at the beginning of the power stroke |
| if an engine with a stroke of 6 inches is operated at 2,000 RPM, the piston movement within the cylinder will be | at maximum velocity 90 deg. after TDC |
| 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 |
| if metallic particles are found in the oil filter during an inspection, | the cause should be indentified an corrected before the aircraft is released for flight |
| the actual power delivered to the propeller of an aircraft engine is called | brake horsepower |
| what is the purpose of the safety circlet installed on some valve stems? | to prevent valves from falling into the combustion chamber |
| after spark plugs from an opposed engine have been serviced, in what position should they be reinstalled? | next in firing order to the one from which they were removed and swapped bottom to top. |
| the horsepower developed in the cylinders of a reciprocating engine is known as the | indicated horsepower |
| an unsupercharged aircraft reciprocating engine, operated at full throttle from sea level, to 10,000 feet, orovided the RPM is unchanged, will | lose power due to the reduced density of the air drawn into the cylinders. |
| engine crankshaft runout is usually checked | during engine overhaul and after a 'prop strike' or a sudden engine stoppage |
| which of the following will be caused by excessive valve clearance of a cylinder on a reciprocating aircraft engine? | reduced valve overlap period. |
| the primary purpose in setting proper valve timing and overlap is to | obtain the best volumetric efficiency and lower cylinder operating temperature. |
| what special procedure must be followed when adjusting the valves of an engine equipped with a floating cam ring? | eliminate cam bearing clearance when making valve adjustmen. |
| which of these conditions will cause an angine to have an increased tendency to detonate? | high manifold pressure or high intake air temperature. |
| which of the following would indicate a general weak-engine conditions when operated with a fixed-pitch propellor test club? | lower than normal static RPM, full throttle operation |
| when does valve overlap occur in the operation of an aircraft reciprocating engine? | at the end of the exhaust stroke and at the beginning of the intake stroke. |
| which statement pertaining fuel/ air ratios is true? | the mixture ratio which gives the best power is richer than the micture ratio which gives the maximum economy |
| what is the purpose of installing two or more springs on each valve in an aircraft engine? | to eliminate valve spring vibration or surging |
| the floating control thermostat, used in some reciprocating engine installations, helps regulate oil temperature by | controlling airflow through the oil cooler |
| one of the best indicators of reciprocating engine combustion chamber problem is | spark plug condition |
| if the exhaust valve of a four-stroke cycle engine is closed and the intake valve is just closed, the piston on the | compression stroke |
| the five events of a four stroke cycle engine in the order of their occurrence are | intale, compressions, ignition, power, and exhaust |
| which statement 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 |
| valve overlap is defined as the number of degrees of crankshaft travel | during which both valves are off their seats. |
| if the oil pressure guage fluctuates over a wide range from zero to normal operating pressure, the most likely cause is | low oil supply |
| why does the smoothness of operation of an engine increase with a greater number of cylinders? | the power impulses are spaced closer together. |
| what is the best indication of worn valve guides? | high oil consumption |
| a characteristic of dyna-focal engine mounts as applied to aircraft reciprocating engines is that the | shock mounts point toward the engine's center of gravity |
| which of the following will decrease volumetric efficiency in a reciprocating engine? | improper valve timing, sharp bends in the induction system, and high carburator air temperatures |
| excessive valve vlearance results in the valve opening | late and closing early |
| 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 |
| during ground check, an engine is found to be rough-running, the magneto drop is normal, and the manifold pressure is higher than normal for any given RPM, the rouble may be caused by | a dead cylinder |
| excessive valve clearance in a piston engine | decreases valve overlap |
| which condition would be the least likely to be caused by failed or failling engine bearings? | low oil temperature |
| ignition occurs at 28 deg. BTDC on a certain four-stroke cycle engine, and the intake valve opens at 15 deg. BTDC. how many deg of crankshaft travel after ignition does the intake valve open? (consider one cylinder only) | 373 degrees |
| a condition that can occur in a radial engine but is unlikely to occur in a horizontally opposed engine is | hydraulic lock |
| to reduce the power output of an engine equipped with a constant-speed propeller and operating near maximum BMEP, the | manifold pressure is reduced with the throttle control before the RPM is reduced with the propeller control. |
| a nine-cylinder engine with a bore of 5.5 inches and a stroke of 6 inches will have a total piston displacement of | 1,283 cubic inches |
| what is an advantage of using metallic-sodium filled exhaust valves in aircraft reciprocating engines | reduced valve operating temperature |
| cam-ground pistons are installed in some aircraft engines to | provide a better fit at operating temperature. |
| direct mechanical push-pull carburator heat control linkages should normally be adjusted so that the stop located on the diverter valve will be connected | before the stop at the control lever is reached on both HOT and COLD positions |
| if the oil pressure of a cold engine is higher than at normal operating temperatures, the | engine's lubrication system is probably operating normally |
| how may it be determined that a reciprocating engine with a dry sump is pre-oiled sufficiently? | oil will flow from the engine return line or indicator part. |
| valve clearance changes on opposed-tyoe engines using hydraulic lifters are accomplished by | push rod replacemnet |
| what tool is generally used to measure the crankshaft rotation in degrees? | timing disk |
| if air is heard coming from the crankcase breather oil filler during a differential compression check, what is this an indication of? | piston ring leankage |
| what is the principal advantage of using propeller reduction gears? | to enable the engine RPM to be increased with an accompanying increase in power and allow the propeller to remain at a lower, more efficient RPM |
| which statement is correct regarding a four-stroke cycle aircraft engine? | the intake valve closes on the compression stroke |
| which of the following engine servicing operations generally requires engine preoiling prior to starting the engine? | engine installation |
| an engine misses in both the right and left positions of the magneto swtich. the quickest method for locating the trouble is to | check for one or more cold cylinders |
| by use of a differential pressure compression tester, it is determined that cylinder 3 of a nine cylinder radial engine will not hold pressure after the crankshaft has been rotated 260 deg. from TDC compression stroke cylinder 1, how can this indication.. | a normal indication |
| how many of the followign are factors in establishing the maximum compression ratio limitations of an aircraft engine? | detonation characteristics of the fuel design limitations of the engine, and the dedgree of supercharging |
| which statement is correct regarding engine crankshafts? | moveable counterwights serve to reduce torsional vibrations in an aircraft reciprocating engine |
| on which stroke are both valves in a four stroke cycle reciprocating aurcraft engine open? | exhaust and intake |
| the operating temperature valve clearing of a radial engine as compared to cold valve clearance is | greater |
| of the hot clearance is used to set the valves when the engine is cold, what will occur during operating of the engine? | the valves will open late and close early |
| which of the following is most likely to occur if an overhead valve engine is operated with inadequate valve clearance? | the valves will not seat positively during start and engine warmup |
| full-floating piston pins are those which allow motion between the pin and | both the piston and the small end of the connecting rod |
| grinding the valves of a reciprocating engine to a feather edge is likely result in | preignition and burned valves |
| which type of bearings are generally used for connecting rods and cam shafts? | plain |
| what is required by 14 CFR part 43 appendic D when performing an annual/100 hour inspection on a reciprocating engine aircraft? | cylinder compression check |
| (1) cast iron piston rings may be used in chrome plated cylinders (2) chrome plated rings may be used in plain steel cylinders regarding the above, which is true. | both are true |
| what does valve overlap promote? | better scavenging and cooling characteristics |
| if an engine cylinder is to be removed, at what position in the cylinder should the piston be? | top dead center |
| using the following information, determine how many degrees the crankshaft will rotate with both the intake and exhaust valves seated | 245 deg |
| if the ignition switch is moved from BOTH to either LEFT or RIGHT during an engine ground check, normal operation is usually indicated by a slight | drop in torque meter pressure indication |
| the volume of a cylinder equals 70 cubic inches when the piston is at bottom center, when the piston is at the top of the cylinder, the volume equals 10 cubic inches. what is the compression ratio? | 7:1 |
| some aircraft engine manufacturers equi[ their product with choked or taper-ground cylinders in order to | provide a straight cylinder bore at operating temperature |
| excessive valve clearance will cause the duration of valve opening to | decrease for both intake and exhaust valves. |
| which of the following conditions would most likely lead to detonation? | use of jet fuel wiht too low an octane rating |
| as the pressure is applied during a reciprocating engine compression check using a differential pressure tester, what would movement of the propeller in the direction of engine rotation indicate? | the piston was positioned past TDC |
| how is proper end-gap clearance on new piston rings assured during the overhaul of an engine? | by placing the rings in the cylinder and measuring the end gap with a feeler gauge. |
| during overhaul, reciprocating engine exhaust valves are checked for stretch | with a contour or radius gauge |
| engine operating flexibility is the ability of the engine to | run smoothly and give the desired performance at all speeds |
| compression ratio is the ratio between the | cylinder volume with the piston at BDC and at TDC |
| backfiring through the carburator generally results from the use of | an excessively lean mixture |
| (1) preignition is cause by improper ignition timing (2) detonation occurs when an area of the combustion chamber becomes incandescent and ignites the fuel/air mixture in advance of the normal timed ignition, regarding the above, | neither is true |
| an aircraft reciprocating engine using hydraulic valve lifters is observed to have no clearance in its valve operating mechanis, after the minimum inlet oil and cylinder head temp. for takeoff have been reached, whem can this condition be expected? | during normal operation |
| at what speed must a crankshaft turn if each cylinder of a four stroke cycle engine is to be fired 200 times a minute? | 400 RPM |
| when cleaning aluminum and magnesium engine parts, it is inavisable to soak them in solutions containing soap because | some of the soap will become impregnated in the surface of the material and subsequently cause engine oil contamination |
| whne will small induction system air leaks have the most noticeable effect on engine operation? | at low RPM |
| the primary concern in establishing the firing order for an opposed engine is to | provide for imbalance and elminiate vibration to the greatest extent possible |
| some cylinder barrels are hardened by | nitriding |
Created by:
cordon.gabriel
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