Powerplant 2022

which statement is treu regarding bearings used in high-powered reciprocating aircraft engines

a condition that can occur in radial engines but is unlikely to occur in horizontally opposed engines is

which condition would be the least likely to be caused by failed or failing engine bearings

waht is the principal advantage of using propeller reduction gears

which of the following will decrease volumetric efficiency in a reciprocating engine

which of the following is a characteristic of a thrust bearing used in most radial engines

which hbearing is least likely to be a roller or ball bearing

the operating temperature valve clearance of a radial engine as compared to cold valve clearance is

a nine-cylinder engine with a bore of 5.5 inches and a stroke of 6 inches will have a total piston displacement of

the five events of a four-stroke cycle engine in the order of their occurrence are

the primary concern in establishing the firing order ofr an opposed engine is to

if fuel/air ratio is proper and ignition timing is correct, the combustion process shoujld be completed

grinding the valves of a reciprocating engine to a feather edge is likely to result in

which statement is correct regarding engine crankshafts

on which strokes are both valves on a four-stroke cycle reciprocating aircraft engine open

which type of bearings are generally used for connecting rods and cam shafts

the actual power delivered to the propeller of an airraft engine is called

cam-ground pistons are installed in some aircraft engines to

using the following information, determine how many degrees the cranksaft will rotate with both the intake and exhaust valves seated
Intake opens 15° BTDC
Exhuast opens 70° BBDC
Intake closes 45° ABDC
Exhaust closes 10° ATDC

some aircraft engine manufacturers equip their product with choked or taper-ground cylinders in order to

an aircraft reciprocating engine using hydraulic valve lifters is observed to have no clearance in its valve-operating mechanism after the minimum inlet oil and cylinder head temperatures for takeoff have been reached. when can this condition be expected

what tool is genreally used to measure the crankshaft roation in degrees

if an engine with a stroke of 6 inches is operated at 2,000 RPM, the piston movement within the cylinder will be

if the intake valve is opened too early in the cycle of operation of a four-stroke cycle engine, it may result in

some cylinder barrels are hardened by

which statement is correct regarding a four-stroke cycle aircraft engine

on which part of the cylinder walls of a normally operating engine will the greatest amount of wear occur

during overhaul, reciprocating engine exhaust valves are checked for stretch

when is the fuel/air mixture ignited in a conventional reciprocating engine

ignition occurs at 28° BTDC on a certain four-stroke cycle engine, and the intake valve opens at 15° BTDC. how many degrees of crankshaft travel after ignition does the intake valve open? (consider one cylinder only)

what is the purpose of the safety circlet installed on some valve stems

valve overlap is defined as the number of degrees of crankshaft travel

the valve clearance of an engine using hydrualic lifters, when the lifters are completely flat, or empty, should not exceed

if the exhuast valve of a four-stroke cycle engine is closed and the intake valve is just closed, the piston is on the

which of th efollowing are factors in establishihng the maximum compression ratio limitaitons of an aircraft engine

full-flosting piston pins are those which allow motion between the pin and

the primary purpose in setting proper valve timing and overlap is to

if the hot clearance is used to set the valves when the engine is cold, what will occur during operation of the engine

what is the purpose of installing two or more springs on each vlave in an aircraft engine

during overhaul, the disassembled parts of an engine are usually degreased with some form of mineral spritits solvent rather than water-mixed degreasesrs primarily because

why does the smoothness of operation of an engine increase with a greater number of cylinders

compressionratio is the ratio between the

the crankshaft runout readings on the dial indicator are plus .002 inch an dminus .003 inch, the runout is

(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 statements,

how is proper end-gap clearance on new piston rings assured during the overhual of an engine

the volume of a cylinder equals 70 cubic inches when the piston is at bottom center. when the piston is a the top of the cylinder, the volume equals 10 cubic inches. what is the compression ratio

when cleaning aluminum and magnesium engine parts, it is inadvisable to soak them in solutions containg soap because

hat is the purpose of a power check on a reciprocating engine

what will be the likely result if the piston ring gaps happen to be aligned when performing a differential pressure compression check on a cylinder

which of the following will be caused by excessive valve clearance of a cylinder on a reciprocating aircraft engine

the floating control thermostat, used on some reciprocating engine installations, helps regulate oil temperature by

which of the following would indicate a gerneral weak-engine conditon when operated with a fixed-pitch propeller or test club

what is required by 14 CFR Part 43 Appendix D when preforming an annual/100-hour inspection on a reciprocating engine aircraft

after spark plugs from an opposed engine have been serviced, in what position should they be reinstalled

as the pressure is applied during a reciprocating engine compression check using a differential pressure tester, what would a movement of the propeller in the direction of engine rotation indicate

excessive valve clearance results in the valves opening

during routine inspection of a reciprocating engine, a deposit of small, bright, metallic particles which do not cling to the magnetic drain plug is discoverd in the oil sump and on the surface of the oil filter. this condition

a characteristic of dyna-focal engine mounts as applied to aircraft reciproctating engines is that the

if metallic particles are found in the oil filter during an inspection,

if the oil pressure gauge fluctuates over a wide range from zero to normal operating pressure, the most likely cuase is

what special procedure must be followed when adjusting the vlaves of an engine equpped with a floating cam ring

which of th efollowing is most likely to occur if an overhead valve engine is operated with indaequate valve claerances

excessive valve clearances will cause the duration of the valve opening to

what does valve overlap promote

at what speed must a crankshaft turn if each cylinder of a four-stoke cycle engine is to be fired 200 times a minute

enigne crankshaft runout is usually checked

before attempting to start a radial engine that has been shut down for more than 30 minutes,

an engine misses in both the right and left positions of the magneto switch. the quickest method for locatin gth etrouble is to

a hissing sound from the exhuast stacks when the propeller is being pulled through manually indicates

if the oil pressure of a cold engine is higher than at normal operating temperatures, the

if an engine operates with a low oil pressure and a high oil temperatuer, the problem may be cuased by a

which fuel/air mixture will result in the highest engine temperature (all other factors remainign constant)

if an engine cylinder is to be removed, at what postion in the cylinder should the piston be

the horsepower developed in the cylinders of a reciprocating engine is known as the

engine operating flexibility is the ability of the engine to

standard aircraft cylinder oversizes usually range from 0.010 inch to 0.030 inch. oversize on automobile engine cylinders may range up to 0.100 inch. this is because aricraft engine cylinders

if the ignition swtich is moved from BOTH to either LEFT or RIGHT during an engine gorund check, normal operation is usually indicated by a slight

during gorudn 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. he trouble may be cuased by

what is the best indication of worn valve guides

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° from top dead center copmression stroke cylinder 1. how can this indication usually be interpreted

when does valve overlap occur in the operation of an aircraft reciprocating engine

what is an advantage of using metallic-sodium filled exhaust valves in aircraft reciprocating engines

valve clearance changes on opposed-type engines using hydrualic lifters are accomplished by

what is likely to occur if a reciprocating engine is operated at high power settings before it is properly warmed up

an increase in manifold pressure with a constant RPM will cuase the bearing load in an engine to

direct mechanical push-pull carburetor heat control linkages should normally be adjusted so that the stop located on the diverter valve will be contacted

reduced air density at high altitude has a decided effect on carburetion, reuslting in a reduction of engine power by

increased water vapor (higher relative humidity) in the incoming air to a reciprocating engine will normally result in which of the following

(1) preignition is caused by improper ignition timing
(2) detonation occurs when an area of the combustion chamber becomes incandescent and ignites the fuel/air misture in advance of normal timed ignition
regarding the above statements,

which of the follwing engine servicing operations generally requires engine pre-oiling prior to starting the engine

during the inspetion of an engine control system in which push-pull control rods are used, the threaded rod ends should

which of the following conditions would most likely lead to detonation

an unsupercharged aircraft reciprocating engine, operated at full throttle from sea level, to 10,000 feet, provided the RPM is unchanged, will

which of the follwing would most likely cause a reciprocating engine to backfire through the induction system at low RPM operation

how may it be determined that a reciprocating engine with a dry sump is pre-oiled sufficiently

what is teh basic operational sequence for reducing the power output of an engine equipped with a constant-speed propeller

which statement pertaining to fuel/air ratios is true

backfiring thorug the carburetor generally results from the use of

which of these conditoins will cause an engine to have an inreased tendency to detonate

whn will small induction system aire leakshave the most noticeable effect on engine operation

to reduce the pwer output of an engine equipped with a constant-speed propeller and operating near maximum BMEP, the

one of the best indicators of reciprocating engine combustion chamber problems is

what could cause excessive pressure buildup in the crankcase of a reciprocating engine

excessive valve clearance in a piston engine

to what altitude will a turbo charged engine maintain sea level pressure

if air is heard comingform the crankcase breather or oile filler during a differential compression check, what is this an indication of

one cause of afterfiring in an aircraft engine is

at what point in an axial-flow turbojet engine will the highest gas pressures occur

one function of the nozzle diaphragm in a tubine engine is to

what is the profile of a turbine engine compressor blade

the fan rotational speed of a dual axial compressor forward fan engine is the same as the

the abbreviation Pt7 used in a turbine engien terminology means

the blending of blades and vanes in a turbine engine

what turbine engine section provides for proper mixing of the fuel and air

in a gas turbine engine, combustion occurs at a constant

which statement is true regarding jet engines

some hihg-volume turboprop and turbojet engines are equipped with two-spool or split compressors. when these engines are operated at high altitudes, the

turbine nozzle diaphragms located on the upstream side of each turbine wheel, are used in the gas turbine engine to

where is teh highest gas pressure in a turbojet engine

an exhaust cone placed aft of the turbine in a jet engnie will cause the pressure in the first part of the exhaust duct to

what is the function of teh stator vane assembly at the discharge end of a typical axial-flow compressor

the turbine section of a jet engine

when starting a turbine engine

in the dual axial-flow or twin spool compressor system, the first stage turbine drives the

which of the following may be used to marke tubine engine components exposed to high temperatures

when starting a tubine engine, a hung start is indicated if the engine

what are the two basic elements of the tubine section in a turbine engine

which of the follwoing acts as a diffuser in a turbine engine and converts velocity to pressure

the function of the exhuast cone assembly of a turbine engine is to

what are the two functional elements in a centrifugal compressor

what must be done after the fuel control unit has been replaced on an aircraft gas turbine engine

if, during inspection at engine overuhaul, ball or roller berings are found to have magnetism but otherwise have no defects, they

a turbine engine compressor which contains vanes on both sides of the impeller is a

what is the first engine instrument indicaiton of a successful start of a turbine engine

some engine manufactureers of twin spool gas turbine engines identify tubine discharge pressure in their maintennce manuals as

who establishes the recommended operating time between overhauls (TBO) of a turbine engine used in general aviation

the basic gas turbine engine is divided into two main sections: the cold section and the hot section.
(1) the cold section includes the engine inlet, compressor, and turbine sections.
(2) the hot section includes the combustor, diffuser, and exhuast sections
regarding the above statements

(1) welding and straightening of tubine engine rotating airfoils does not require spectial equipment.
(2) welding and straightening of tubine engine rotating airoils is commonly recommended by the manufacturer
regarding the above statements,

turbine engine components exposed to high temperatures generally may not be marked with

who establishes mandatory replacement times for critical components of turbine engines

main bearing oil seals used with turbine engines are usually what type(s)

how does a dual axial-flow compressor improve the efficiency of a turbojet engine

three types of tubine blades are

which statement is true regarding aircraft engine propulsion

an advantage of the axial-flow compressor is its

what is one purpose of the stator blades in the compressor section of aturbine engine

what is the purpose of the diffuser section in a turbine engine

where do stress rupture cracks usually appear on turbine blades

in which type of turbine combustion chamber is the case and liner removed and istalled as one unit during routine maintenance

the diffuser section of a jet engine is located between

when the leading edge of a first-stage turbine blade is found to have stress rupture cracks, which of the following should be suspected

turbine blades are generally more susceptible ot operating damage than compressor blades because of

which of the follwing is the ultimate limiting factor of tubine engine operation

the recurrent ingestion o fdust or other fine airborne particulates into a turbine engine can result in

which of the follwing engine variables is the most critical during tubein engine operation

reduced blade vibration and improved airflow characteristics in gas tubines are brought about by

which turbine engine compressor offers the greatest advantages for both strating flexibility and improved hihg-altitude performance

jet engine turbine blades removed for detailed inspection msut be reinstalled in

an advantage of the centrifugal-flow compressor is its high

the hgihest heat-to-metal contact in a jet engine is the

which two elements make up the axial-flow compressor assembly

the two types of ventrigual compressor impellers are

between each row of rotating blades in a turbine engine compressor, tehre is a row of stationary blades which act to diffuse the air. these stationary blades are called

standard sea level pressure is

using standard atmospheric conditions, the standard sea level temperature is

when aircraft turbine blades are subjected to excessive heat stress, what type of failures would you expect

in an axial-flow compressor, one purpose of the stator vanes at the discharge end of the compressor is to

compressor field cleaning on turbine engines is performed primarily in order to

hot section inspections for many modern tubine engines are required

a prupose of the shrouds on the turbine blades or an axial-flow engine is to

in a dual axial-flow compressor, the first stage turbine drives

what should be done initially if a tubine engine catches fire when starting

what is the proper starting sequence for a turbojet engine

a weak fuel to air mixture along with normal airflow througha tubine engine may result in

what is used in tubine engines to aid in stabilization of compressor airflow during low thrust engine operation

in a turbine engine with a dual-spool compressor, the low speed compressor

what is the funciton of the inlet gide vane assembly on an axial-flow compressor

which of the following is a good indication of a malfuntioning fuel nozzle when inspecting the exhuast se tion of an aircraft turbine engine

the stator vanes in an axial-flow compressor

the velocity of subsonic air as it flows throug a convergent nozzle

the velocity of supersonic air as it flows through a divergent nozzle

the pressure of subsonic air as it flows thorugh a convergent nozzle

the pressure of supersonic air as it flows thorugh a divergent nozzle

anti-icing of jet engine air inlets is commonly accomplished by

generally, when starting a tubine engien, the starter should be disengaged

what is the primary advantage of an axial-flow compressor over a entrifugal compressor

the purpose of a bleed valve, located in the beginning stages of the compressor, in an aircraft gas turbine engine is to

what is meant by a double-entry centrifugal compressor

what is the major function of the turbine assembly in a tubojet engine

stator blades in the compressor section of an axial-flow turbine engine

a gas turbine engien compreses which three main sections

what type of turbine blade is most commonly used in aircraft jet engines

what is the primary factor which controls the pressure ratio of an axial-flow compressor

the non-rotating axial-flow compressor airfoils in an aircraft gas tubein engine, are called

(1) In a turbine engine axial-flow compressor, each consecutive pair of rotor and stator blades constitutes a pressure stage
(2) In a turbine engine axial-flow compressor, the number of rows of stages is determined by the amount of air and total pressure rise required
regarding the above statements,

the air passing through the combustion chamber of a turbine engine is

the stators in the tubine section of a gas tubine engien

teh compressor stators in a gas turbine engien act as diffusers to

teh procedure for removing the accumulation of dirt deposits on compressor blades is called

which of the following may be used to accomplish internal inspection of an assembled turbine engine

what is the possible cause when a turbine engine indicates no change in power setting parameters, but oil temperature is high

newton's first law of motion, genreally termed the law of inertia, states:

newton's second law of motion, generally termed the law of momentum, states:

a turbine engine hot section is particulary susceptible to which kind of damage

dirt partiles in the air being introduced into the compressor of a turbine engine will form a coating on all but which of the follwoing

severe rubbing of turbine engine compressor blades will usually cause

which of the following influences the operation of an automatic fuel control unit on a turbojet engine

if a turbine engine is unable to reach takeoff EPR before its EGT limit is reached, this is an indication that the

the Brayton cycle is known as the constant

continued and/or excessibe heat and centrifugal force on turbine engine rotr blades is likely to cause

if the RPM on an axial-flow compressor remains constant, the angle of attack of the rotor blades can be changed by

the compression ratio of an axial-flow compressor is a function of the

which of the following variables affect the inlet air density of a turbine engine

which of the following factors affect the thermal efficiency of a tub ine engine

why do some turine engines have more than one turbine wheel attached to a single shaft

teh exhuast section of a turbine engine is designed to

which of the following types of combustion sections are sued in aircarft tubine engines

a cool-off period prior to shutdown of a turbine engien is accomplished in order to

what type igniter plug is used tin the low tension ignition system of an aircraft turbofan engine

what is meant by a shrouded turbine

what term is used to describe a permanent and cumulative deformation of the turbine blades of a turbojet engien

what is the purpose of the dump valve used on aircraft gas turbine engines

at what stage in a turbine engine are gas pressures the greatest

in what section of a turbojet engine is the jet nozzle located

(1) Accumulation of contaminates in the compressor of a turbojet engine reduces areodynamic efficiency of the blades
(2) two common methods for removing dirt deposits from turbojet engine compressor blades are a fluid was and an abrasive grit blast
regarding the above statements,

hot spots in the combustion section of a turbojet engine are possible indicators of

which of the following can cause fan blades shingling in a turbofan engine

compressor stall is caused by

a conditon known as "hot streaking" in turbine engines is caused by