AVM Powerplant Practice Test

These questions are part of the practice quiz. Start practicing

• What is the purpose of a bellmouth inlet?
• The Brayton cycle is known as which type of cycle?
• What does the term 'totalizer' refer to in the context of fuel systems?
• Regarding powerplant installation on aircraft with a Standard Airworthiness Certificate, which statement is true?
• What is the first engine instrument indication of a successful start of a turbine engine?
• Which two elements make up the axial-flow compressor assembly?
• Engine pressure ratio is determined by
• Hot spots in the combustion section are most likely indicative of which issue?
• During turbine engine start, a hot start is indicated by which condition?
• Which method is used to provide clean air to engines of helicopters and turboprop airplanes that have particle separators installed?
• The computerized fuel system (CFS) with a totalizer-indicator provides indication of how many of the following?
• What is the primary purpose of the tachometer on an axial-compressor turbine engine?
• Instruments that provide readings of low or negative pressure, such as manifold pressure gauges, are usually what type?
• Which statement correctly describes the nozzle diaphragm function?
• If during inspection at engine overhaul, ball or roller bearings are found to have magnetism but otherwise have no defects, they
• The non-rotating axial-flow compressor airfoils in an aircraft gas turbine engine are called what?
• Most exhaust system failures result from thermal fatigue cracking in areas of stress concentration. This condition is usually caused by which factor?
• Severe rubbing of turbine engine compressor blades will usually cause which damage?
• Which instrument indicates thrust of a gas turbine engine?
• Statements about turbine engine indicators: which is true?
• Which of the following would be a likely engine symptom when operating with a weak fuel-to-air mixture?
• What is the primary efficiency improvement provided by a dual axial-flow compressor?
• In some twin-spool manuals, turbine discharge pressure is labeled Pt2. Which option best identifies this label?
• Indentations on bearing races caused by high static loads are known as?
• The engine pressure ratio indicator is a direct indication of which of the following?
• Regarding the statements about engine pressure ratio (1) and (2), which is true?
• Regarding turbine blade serviceability, which statement is true?
• During turbine engine operation, which parameter is considered the most critical to monitor?
• What is meant by a double-entry centrifugal compressor?
• The stator vanes in an axial-flow compressor perform which energy transformation?
• Where do stress rupture cracks usually appear on turbine blades?
• Which contains approved data for performing a major repair to an aircraft engine?
• Vortex dissipator systems use which method to prevent FOD?
• The two types of centrifugal compressor impellers are
• What device helps stabilize compressor airflow during low thrust operation?
• The velocity of subsonic air as it flows through a convergent nozzle
• Shrouded turbine rotor blades primarily provide which benefit?
• What type igniter plug is used in the low tension ignition system of an aircraft turbofan engine?
• Which term describes a severe fretting where metal is transferred from one surface to another?
• Which statement best reflects the function of static vanes in a turbine compressor system when considering performance impact?
• The engine pressure ratio indicator directly indicates which of the following?
• Hot spots on the tail cone are an indicator of malfunction in which engine subsystem?
• When starting a turbine engine, the starter should be disengaged:
• The turbine section of a turbine engine comprises which two main components?
• Generally, when maximum APU shaft output power is being used in conjunction with pneumatic power
• The compressor stators in a gas turbine engine act as diffusers to
• The abbreviation Pt7 used in turbine engine terminology means
• How does a dual axial-flow compressor improve the efficiency of a turbojet engine?
• Which condition commonly leads to compressor stall in a turbine engine?
• The number of rows of stages in an axial-flow compressor is determined by
• What is the purpose of the diffuser section in a turbine engine?
• What is the primary advantage of an axial-flow compressor over a centrifugal compressor?
• Hot spots in the combustion section of a turbojet engine are possible indicators of which issue?
• In an axial-flow compressor, a pressure stage is formed by
• In which section of a turbojet engine is the jet nozzle located?
• The function of an APU air inlet plenum is to stabilize the pressure of the air before it enters the compressor.
• Standard sea level pressure is
• Which combustion section configuration is used when multiple cans are employed in aircraft engines?
• What is used in turbine engines to aid in stabilization of compressor airflow during low thrust engine operation?
• Which parameter most directly influences turbine engine thermal efficiency besides turbine inlet temperature?
• Motor-driven impeller and turbine fuel flow transmitters are designed to transmit data
• The vortex dissipators installed on some turbine-powered aircraft to prevent engine FOD utilize which method?
• In terms of engine performance, which statement best describes the relationship to thermal efficiency?
• What is the primary purpose of shrouds on the turbine blades of an axial-flow engine?
• What publication contains the mandatory replacement time for parts of a turbine engine?
• The tachometer indicator is responsive to changes in which parameter?
• If a turbine engine is unable to reach takeoff EPR before its EGT limit is reached, which of the following is a likely indication?
• Which statement is true regarding the air passing through the combustion section of a jet engine?
• For engine pressure ratio, which statement is true?
• Which factors affect the thermal efficiency of a turbine engine?
• The turbine nozzle diaphragms are located on the upstream side of each turbine wheel. They are used to
• What is one purpose of the stator blades in the compressor section of a turbine engine?
• When must an Airworthiness Directive (AD) be complied with after it becomes effective?
• Which variables affect the inlet air density of a turbine engine?
• The purpose of a bellmouth compressor inlet is to
• The Brayton cycle used in turbine engines is defined as a constant what cycle?
• Which parameter does fuel flow indication data primarily represent for engine management?
• Airworthiness standards for small airplanes with nine or fewer seats in the normal utility and acrobatic categories are found in which regulation?
• Between each row of rotating blades in a turbine engine compressor, there is a row of stationary blades which act to diffuse the air. These stationary blades are called
• What engine instrument indications may shift when a turbofan engine anti-icing (bleed air) system is turned on ?
• What is the purpose of the dump valve used on aircraft gas turbine engines?
• Which marking material is used to identify turbine components exposed to high temperatures?
• In a subsonic flow through a convergent nozzle, the air velocity
• What maintenance record(s) is/are required following a major repair of an aircraft engine?
• If oil temperature is high but power setting unchanged, what is the most likely fault?
• In turbine engine terminology, Pt7 refers to
• The purpose of a bleed valve located in the beginning stages of the compressor in an aircraft gas turbine engine is to
• Reduced blade vibration and improved airflow characteristics in gas turbines are brought about by
• In what units are turbine engine tachometers calibrated?
• Which section is associated with increasing the static pressure of the air flow by transforming velocity energy?
• The fan rotational speed of a dual axial compressor forward fan engine is the same as the
• What are the two functional elements in a centrifugal compressor?
• The RPM indication of a synchronous AC motor-tachometer is determined by the frequency of what?
• What is the primary purpose of the tachometer on an axial-compressor turbine engine?
• Which unit in a tachometer system sends information to the indicator?
• The exhaust section of a turbine engine is designed to do what?
• Which marking material is used to identify turbine engine components exposed to high temperatures?
• Why do some turbine engines have more than one turbine wheel attached to a single shaft?
• The compression ratio of an axial-flow compressor is a function of the
• If a gas turbine engine has high exhaust gas temperature, high fuel flow, and low RPM at all engine power settings, what is a possible cause?
• Which of the following indicates that a combustion chamber of a jet engine is not operating properly?
• What is the primary function of the exhaust cone assembly in a turbine engine?
• Thrust reversers utilizing a pneumatic actuating system usually receive operating pressure from which source?
• The turbine section of a jet engine primarily drives which other section?
• The fuel flowmeter indicator rotor and needle for a motor-impeller and turbine indicating system is driven by what?
• Which marking method is generally not acceptable on high-temperature turbine components?
• What is the function of a blast tube as found on aircraft engines?
• Anti-icing of jet engine air inlets is commonly accomplished by which method?
• What is the general objective of a turbine engine oil analysis program?
• What is the function of the stator vane assembly at the discharge end of a typical axial-flow compressor?
• Which two methods are commonly used to remove dirt from turbojet compressor blades?
• Engine pressure ratio is defined as the total pressure ratio between which pair of points?
• In the two-section model of a gas turbine engine, the statements that the cold section includes the engine inlet, compressor, and turbine; and the hot section includes the combustor, diffuser, and exhaust are true. Regarding the above statements, which is true?
• Who establishes the recommended operating time between overhauls (TBO) of a turbine engine used in general aviation?
• Airworthiness Directives (ADs) may require immediate compliance for emergency ADs. Which statement is true?
• Which of the following would most likely cause an increase in exhaust gas temperature (EGT) in a turbine engine?
• Which component is described as the stationary part in the axial-flow compressor?
• A Bourdon-tube instrument may be used to indicate which of the following?
• Which of the following is NOT a design goal for thrust reverser systems?
• Which type of instrument is typically used to measure relatively high fluid pressures such as oil pressure gauges?
• Which instrument fault condition requires replacement of the instrument?
• On an aircraft turbine engine operating at a constant power the application of engine anti-icing will result in
• Which of the following is a good indication of a malfunctioning fuel nozzle when inspecting the exhaust section of an aircraft turbine engine?
• Three types of turbine blades are
• Which indicator would be used to estimate remaining endurance at the current power setting?
• Which instrument condition is acceptable and does not require immediate correction?
• Which statement best describes a double-entry centrifugal compressor?
• In the proper starting sequence for a turbojet engine, which component is activated second?
• What is meant by a shrouded turbine?
• The pressure of supersonic air as it flows through a divergent nozzle
• Which statement is correct concerning a thermocouple-type temperature indicating instrument system?
• Which factor most commonly causes exhaust system thermal fatigue cracking, as described in the material?
• Turbine blades are generally more susceptible to operating damage than compressor blades because of
• Which turbine engine compressor offers the greatest advantages for both starting flexibility and improved high-altitude performance?
• Thrust reversers that use a pneumatic actuating system usually receive operating pressure from which source?
• Dirt particles in the air entering the compressor will form a coating on all but which component?
• An APU is usually rotated during start by which device?
• When an engine with a subsonic divergent type inlet duct is running in place at high speed on the ground, the air pressure within the inlet is what?
• In a shrouded turbine, blade tips form what feature?
• Severe rubbing of compressor blades will usually cause which damage?
• Which of the following types of combustion sections are used in aircraft turbine engines?
• Which blade design is associated with reduced vibration in turbine engines?
• Which combination of engine instrument indicators may shift when the anti-icing bleed system is activated?
• A common type of electrically operated oil temperature gauge utilizes which circuit?
• Turbine blades are generally more susceptible to operating damage than compressor blades because of
• Which statement best describes the function of the exhaust section in a turbine engine?
• Defective plating or excessive loads can cause the breaking loose of small metal pieces from coated surfaces. What is this phenomenon called?
• Usually, most of the load placed on an APU occurs when
• Which item is NOT among the indicators listed for the CFS totalizer-indicator?
• Which statement about thrust reverser systems is true?
• Which is the ultimate limiting factor of turbine engine operation?
• The purpose of an engine/inlet anti-ice system is primarily to
• In a turbine engine, which component is designed to increase the pressure of the incoming air before combustion?
• Between each row of rotating blades in a turbine engine compressor, there is a row of stationary blades known as what? Choose the term that best describes these stationary blades.
• In a thrust reversing system, what is the purpose of cascade vanes?
• What are the two main sections used to categorize a basic gas turbine engine?
• Main bearing oil seals used with turbine engines are usually what type(s)?
• Which statement describes the correct procedure for cooling an APU before shutdown related to bleed air?
• Where is the highest gas pressure in a turbojet engine?
• For high-altitude operation of two-spool compressors, which statement is true?
• What is the blade tip thickness characteristic of a turbine engine compressor blade?
• Which statement about main bearing oil seals is correct?
• In maintenance manuals for some twin-spool engines, turbine discharge pressure is identified as Pt7. Which option correctly reflects this labeling?
• Airworthiness Directives of an emergency nature may require immediate compliance upon receipt. True or False?
• What is the profile of a turbine engine compressor blade?
• Which statement regarding engine driven propellers is true?
• Engine pressure ratio is the total pressure ratio between which two points?
• Which section is FAA-approved for continued airworthiness documentation?
• Which instrument condition would be considered acceptable and not require immediate correction?
• The velocity of supersonic air as it flows through a divergent nozzle
• In a turbine engine, gas pressures are greatest at which stage?
• In the turbine section, the stators are designed to
• Stator blades in the compressor section of an axial-flow turbine engine
• In an axial-flow turbojet engine, at what point do the highest gas pressures occur?
• Which statement about axial-flow vs centrifugal compressors is correct?
• During turbine engine startup, a hung start is indicated by which condition?
• A weak fuel-to-air mixture along with normal airflow through a turbine engine may result in
• Why do helicopters require a minimum of two synchronous tachometer systems?
• Which components are included in the hot section of a basic gas turbine engine according to the description?
• The rearward thrust capability of an engine with the thrust reverser system deployed is:
• Which condition is usually not acceptable to any extent in turbine blades?
• In a turbine engine, where is the turbine discharge pressure indicator sensor typically located?
• In a jet engine, which component experiences the highest heat-to-metal contact?
• In a dual axial-flow compressor, the first stage turbine drives
• Regarding powerplant instrument range markings statements: (1) show whether current state is normal, acceptable for a limited time, or unauthorized. (2) Based on installed engine operating limits which may not exceed (but are not necessarily equal to) those limits shown on the engine Type Certificate Data Sheet. Which of the following is true?
• The pressure source for thrust reverser actuators in many engines is typically which system?
• The air passing through the combustion chamber of a turbine engine is used for which two main purposes?
• Which of the following may be used to accomplish internal inspection of an assembled turbine engine?
• At what stage in a turbine engine are gas pressures the greatest?
• Hot section inspections for many modern turbine engines are performed on what basis?
• Indentations on bearing races caused by static loads are known as?
• In an axial-flow compressor, which component is primarily responsible for guiding airflow to the rotor blades at the proper angle?
• Who establishes mandatory replacement times for critical components of turbine engines?
• In a centrifugal compressor, the two functional elements are which?
• Which component operates at the highest temperatures in a turbine engine?
• What is the function of the Inlet Guide Vane Assembly on an axial-flow compressor?
• Turbine nozzle diaphragms located on the upstream side of each turbine wheel are used to
• Vortex dissipator systems are generally activated by
• Discharge-end stator vanes misalignment would most likely cause which issue?
• Thrust reversers utilizing a pneumatic actuating system usually receive operating pressure from
• Which statement about the engine bleed air system is true?
• What part of an aircraft in flight will begin to accumulate ice before any other?
• The exhaust gas temperature (EGT) indicator on a gas turbine engine provides a relative indication of which parameter?
• Which parameter most influences the operation of an automatic fuel control unit on a turbojet engine?
• Which turbine blade type is most commonly used in aircraft jet engines?
• In an axial-flow turbojet, the location of maximum gas pressure is at the boundary of which component?
• The standard sea level temperature under ISA conditions expressed in degrees Fahrenheit is what?
• Which outcome is achieved by the cooldown period prior to shutdown?
• What are the two basic elements of the turbine section in a turbine engine?
• Which statement best describes how a turbine engine tachometer is calibrated?
• In an axial-flow compressor, which component remains stationary while the other rotates?
• The hot section of a turbine engine is particularly susceptible to which kind of damage?
• When reinstalling a turbine blade after inspection, into which slot must the blade be placed?
• Which of the following describes a consequence of deploying thrust reversers at low ground speeds?
• Blending of blades and vanes in a turbine engine is usually performed how?
• In an APU with a free turbine and a load compressor, the primary function of the load compressor is to
• Engines using cold stream, or both cold and hot stream reversing include:
• When aircraft turbine blades are subjected to excessive heat stress, what type of failures would you expect?
• How are combustion liner walls cooled in a gas turbine engine?
• The function of the exhaust cone assembly of a turbine engine is to
• Engine pressure ratio is defined as the ratio of which parameters?
• Which statement about turbine engine oil analysis programs is NOT true?
• Turbine engine EGT thermocouples are constructed of which materials?
• A primary advantage of the centrifugal-flow compressor is the high pressure rise per stage. True or False?
• Dirt particles in the air entering the compressor will form a coating on all but which component?
• What turbine engine section provides for proper mixing of the fuel and air?
• To accomplish internal inspection of an assembled turbine engine, which component would you most likely inspect with a borescope?
• A divergent nozzle in a jet engine is used to accelerate exhaust flow to higher speeds by
• Which organization is typically responsible for mandating replacement intervals for turbine engine critical components?
• Which statement about engine instrument markings is true?
• Operating thrust reversers at low ground speeds can sometimes cause:
• A condition known as hot streaking in turbine engines is caused by
• Two common methods for removing dirt deposits from compressor blades are a fluid wash and an abrasive grit blast. Which statement is true?
• The fuel flow indication data sent from moto driven impeller and turbine and motorless type fuel flow transmitters measures which parameter?
• The component that operates at the highest temperatures in the turbine engine is the?
• What is a typical purpose of a dump valve in a gas turbine engine?
• A cool-off period prior to shutdown of a turbine engine is accomplished in order to
• Two statements about welding and straightening turbine engine rotating airfoils were evaluated. Which option is correct?
• An advantage of the axial-flow compressor is its
• What is the upper bound of thrust reverser capability as a percentage of the rated thrust in reverse for turbojet airplanes?
• What is the major function of the turbine assembly in a turbojet engine?
• An exhaust cone placed aft of the turbine in a jet engine will cause the pressure in the first part of the exhaust duct to
• In the dual axial-flow or twin-spool compressor system, the first stage turbine drives the
• A severe condition of chafing or fretting in which a transfer of metal from one part to another occurs is called which term?
• The diffuser section of a jet engine is located between
• In a gas turbine engine combustion occurs at a constant
• The pressure of subsonic air as it flows through a convergent nozzle:
• In a turbine engine with a dual-spool compressor the low speed compressor
• On APU's equipped with a free turbine and load compressor the primary function of the load compressor is to
• Which instrument indicates the thrust of a gas turbine engine?
• Which of the following can inspect and approve an engine major repair for return to service?
• In thrust reversing, cascade vanes are used to accomplish which?
• What instrument on a gas turbine engine should be monitored to minimize the possibility of a 'hot' start?
• Among the listed types of damage, which is most associated with the turbine engine hot section?
• Which statement about thermocouple leads is correct?
• What is the primary factor that controls the pressure ratio of an axial-flow compressor?
• What is the proper operating sequence when using thrust reversers to slow an aircraft after landing?
• During routine maintenance, the case and liner are removed and installed as a single unit for which type of turbine engine combustion chamber?
• What type of turbine blade is most commonly used in aircraft jet engines?
• What motor type is used in most electric tachometers?
• Which is used as the primary thrust indicator in some turbine-powered aircraft?
• What should be done initially if a turbine engine catches fire during starting?
• Some engine manufacturers of twin spool gas turbine engines identify turbine discharge pressure in their maintenance manuals as which label?
• Powerplants installed on airplanes with a Standard Airworthiness Certificate must have which certification status?
• What must be done after the fuel control unit has been replaced on an aircraft gas turbine engine?
• What is the function of the Inlet Guide Vane Assembly on an Axial-Flow Compressor?
• Which section in the Instructions for Continued Airworthiness is FAA approved?
• The procedure for removing the accumulation of dirt deposits on compressor blades is called
• The recurrent ingestion of dust or other fine airborne particulates into a turbine engine can result in what?
• Fuel is normally supplied to an APU from which source?
• Which mark on an engine instrument face indicates a maximum limit for high transients such as starting?
• Which marking method is generally not acceptable on turbine engine components exposed to high temperatures?
• The airworthiness standards for the issue of type certificates for small airplanes with nine or less passenger seats in the normal utility and acrobatic categories may be found in the
• Thrust reversers on turbojet powered airplanes can produce between what percent of rated thrust in the reverse direction?
• Continued and/or excessive heat and centrifugal force on turbine engine rotor blades is likely to cause which phenomenon?
• The APU generator is identical to engine-driven generators. Which statement is true about APU generators?
• Which statement about turbine discharge pressure measurement is true?
• In a turbine engine axial-flow compressor, statements: (1) each consecutive pair rotor and stator blades constitutes a pressure stage. (2) The number of rows of stages is determined by the amount of air and total pressure rise required. Regarding the statements
• For particle separators in helicopters, the removal of particulates relies on which principle?
• A turbine engine hot section is particularly susceptible to which kind of damage?
• Which of the following is used to monitor the mechanical integrity of the turbines and check engine operating conditions of a turbine engine?
• What is the proper starting sequence for a turbojet engine?
• The RPM indication of a synchronous AC motor-tachometer is governed by the generator
• The stators in the turbine section of a gas turbine engine
• Newton's First Law of Motion, generally termed the Law of Inertia, states:
• If the RPM of an axial-flow compressor remains constant, the angle of attack of the rotor blades can be changed by
• Field cleaning is the procedure used to remove dirt deposits from which part of a turbine engine?
• What is the function of the stator vanes in the compressor?
• An advantage of the centrifugal-flow compressor is its high which characteristic?
• Which statement about the CFS totalizer-indicator is true?
• What publication is used for guidance to determine whether a power plant repair is major or minor?
• One function of the nozzle diaphragm in a turbine engine is to
• When the leading edge of a first-stage turbine blade shows stress rupture cracks, which condition should be suspected?
• In a centrifugal compressor, which two components are fundamental to its function?
• Accumulation of contaminants in the compressor blades reduces aerodynamic efficiency. Which statement describes the impact?
• When cooling the APU before shutdown is necessary, which action should be taken?
• Fuel scheduling during APU start and under varying pneumatic bleed and electrical loads is maintained
• Which condition may cause a lean die-out in a turbine engine with normal airflow?
• Where is the highest gas pressure in the turbojet engine typically found?
• Which of the following types of electric motors are commonly used in electric tachometers?
• Which statement is true regarding jet engines?
• Which engine variable is the most critical during turbine engine operation?
• Which combination correctly lists the three types of turbine blades?
• A turbine engine compressor which contains vanes on both sides of the impeller is a
• Which system provides pneumatic pressure for thrust reverser actuators?
• In a centrifugal compressor, what are the two functional elements?
• What is the possible cause when a turbine engine indicates no change in power setting parameters but oil temperature is high?
• During operation, the speed of an APU is best described as which?
• Which document is FAA-approved data used for performing major repairs on an aircraft engine?
• Compressor field cleaning on turbine engines is performed primarily to prevent which outcome?
• Welding and straightening turbine engine rotating airfoils are statements evaluated for truth. Which option correctly reflects the given evaluation?
• Under standard atmospheric conditions, the standard sea level temperature is:
• Blade and vane blending is usually performed during overhaul with the engine removed. True or False?
• In an axial-flow compressor, one purpose of the stator vanes at the discharge end of the compressor is to
• The diffuser section is located between which two major sections?