AIM Block 13 Practice Test

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• In vocabulary in context, what indicates the meaning of an unfamiliar word?
• The Brayton cycle is known as the constant ... cycle.
• In a divergent nozzle, supersonic flow, which statement is true?
• An advantage of the axial-flow compressor is its
• How is the range of a data set calculated?
• Which option correctly identifies a factual claim?
• What is the function of stator blades in the compressor section of an axial-flow turbine engine?
• Fuel is normally supplied to an APU from
• What is the relationship between the turbine section and the compressor in a jet engine?
• Compressor field cleaning on turbine engines is performed primarily in order to
• An APU is usually rotated during start by
• Anti-icing of jet engine inlets is commonly accomplished by which method?
• In turbine engine practice, what are the stationary blades between rows of a compressor called?
• A gas turbine engine comprises which three main sections?
• If a turbine engine catches fire during starting, what is the recommended initial action?
• If all A are B and all B are C, which statement is true?
• A turbine engine hot section is particularly susceptible to which type of damage?
• Anti-icing of jet engine air inlets is commonly accomplished by
• Some engine manufacturers identify turbine discharge pressure in their maintenance manuals as Pt7. What does Pt7 refer to?
• Which component is used to start the APU during its start sequence?
• Which component is used to diffuse airflow between stages in a turbine engine compressor?
• Which statement best describes a well-supported inference?
• In a data sufficiency problem, which two steps are required?
• The compressor stators in a gas turbine engine act as diffusers to
• Which two components perform the primary functions in a centrifugal compressor?
• The diffuser section is located between which two sections?
• In the dual axial-flow or twin-spool compressor system, the first stage turbine drives the N(2) compressor.
• Unducted fan propellers peak out at what percentage before they start to lose efficiency?
• Which step is typically the first in the scientific method?
• In a divergent nozzle, supersonic flow, which statement is true?
• Using standard atmospheric conditions, the standard sea level temperature is
• Stress rupture cracks on turbine blades typically appear
• Which strategy most efficiently handles dense passages?
• Which component's function includes straightening the airflow at the discharge end of the axial-flow compressor?
• What feature characterizes a double entry centrifugal compressor?
• Where is the highest gas pressure in a turbojet engine?
• Turbine blades are generally more susceptible to operating damage than compressor blades because of which factor?
• If a claim asserts a cause-effect relationship without evidence, which bias is most likely present?
• When starting a turbine engine, a hot start is indicated if the exhaust gas temperature exceeds specified limits.
• A car travels 150 miles in 3 hours. What is its average speed?
• Hot section inspections for many modern turbine engines are required on what basis?
• The turbine section of a jet engine
• What is the best way to identify an author's purpose in a passage?
• What is the expected diameter range of the Unducted Fan designed engines?
• If a ratio a:b = 3:4 and the total parts equal 21, how many parts does b represent?
• Usually most of the APU load occurs when
• On APUs with a free turbine and load compressor, the primary function of the load compressor is to
• Placing an exhaust cone aft of the turbine causes the velocity in the first part of the exhaust duct to
• What is the function of the stator vane assembly at the discharge end of a typical axial-flow compressor?
• Which statement about magnetized bearings is true?
• What does 'tone' mean in a text?
• How is fuel scheduling during APU start and varying loads maintained?
• What is the first engine instrument indication of a successful start of a turbine engine?
• Compute the mean of the values 2, 4, 6, 8.
• Dust ingestion can cause erosion damage to which parts?
• When aircraft turbine blades are subjected to excessive heat stress, what type of failures would you expect?
• What is the procedure called for removing dirt deposits from compressor blades?
• What is Newton's First Law generally termed?
• Reduced blade vibration and improved airflow characteristics in gas turbines are brought about by which design feature?
• Which component diffuses the air within the compressor to slow it down?
• What is the correct starting sequence for a turbojet engine?
• Solve x^2 - 4 = 0. What are the solutions for x?
• What is the function of the inlet guide vane assembly on an axial-flow compressor?
• What is the purpose of the process of elimination in multiple-choice tests?
• When starting a turbine engine, a hung start is indicated if the engine
• Which statement best describes a stem-and-leaf display?
• One of the earliest steps in scientific investigations?
• In a turbine engine with a dual-spool compressor, the low speed compressor
• What happens to the velocity of subsonic air as it flows through a convergent nozzle?
• Factor the quadratic x^2 - 5x + 6 = 0 and give its solutions.
• Which strategy best increases efficiency on a dense passage?
• What is the ultimate limiting factor in turbine engine operation?
• In which type of turbine engine combustion chamber is the case and liner removed and installed as one unit during routine maintenance?
• What does correlation imply about causation?
• What is the primary function of the stator vanes in an axial-flow compressor?
• What constitutes a credible synthesis across two texts?
• In the turbine section, which component remains stationary?
• If ball or roller bearings at engine overhaul are magnetized but otherwise defect-free, what must be done before use?
• Pt7 is a designation used to label turbine discharge pressure in some manuals. Which of the following is Pt7 most closely associated with?
• Which of the following best describes the blade count of the new prop fan?
• Which statement best describes how the APU manages temperature when delivering high power and pneumatic load?
• Which parameter influences the operation of an automatic fuel control unit on a turbojet engine?
• After replacement of the fuel control unit, what must be done to the engine?
• In an axial-flow compressor, a pressure stage is formed by which arrangement?
• When two passages present similar claims, what should you look for to assess strength of the combined argument?
• What are the two basic elements of the turbine section in a turbine engine?
• The turbine engine component that helps to straighten flow and reduce turbulence in the discharge region of the axial-flow compressor is the
• During inspection, turbine engine components exposed to high temperatures may only be marked with such materials as allowed by the manufacturer. These materials generally include 1, 2, and 4.
• What is the primary purpose of the stator blades in the compressor?
• Which statement is true?
• Which line best shows the author’s tone as skeptical?
• Which form is a valid conditional statement?
• What is meant by a double entry centrifugal compressor?
• Ultra-high bypass turbofan engines will power aircraft with a passenger capacity of
• The stators in the turbine section of a gas turbine engine
• If a:b = 3:5 and a = 9, what is b?
• Which statement correctly identifies the two entry types for centrifugal compressor impellers?
• Which two elements make up the axial-flow compressor assembly?
• In comparing two related passages, which criterion is most important?
• If a turbine engine cannot reach takeoff EPR before its EGT limit is reached, what does this indicate?
• Which statement about unducted fan engines is explicitly supported by the material?
• Which parameter is considered most critical during turbine engine operation?
• What is the function of the exhaust cone assembly in a turbine engine?
• Factor x^2 - 7x + 12 = 0 and provide the solutions.
• A weak fuel to air mixture along with normal airflow through a turbine engine may result in
• What is one purpose of the stator blades in the compressor section of a turbine engine?
• If bearings are magnetized but otherwise defect-free, what is the approved pre-use treatment?
• What is the major function of the turbine assembly in a turbojet engine?
• Three types of turbine blades are
• The new prop fan engines will propel aircraft to approximately what Mach number?
• Which of the following statements correctly describes stators in both the compressor and turbine sections?
• Which approach helps determine the author’s purpose?
• Which statement best distinguishes evidence-based reasoning from conjecture?
• Volume of a rectangular prism with length 4, width 6, and height 2 is?
• If x^2 - 9 = 0, what are the solutions for x?
• How does a dual axial-flow compressor improve the efficiency of a turbojet engine?
• Recurrent ingestion of dust into a turbine engine can result in which damage?
• Which statement would most weaken an argument?
• The blades on ultra-high bypass turbofan engines are made up of which three materials?
• What happens to the velocity of subsonic air as it flows through a convergent nozzle?
• What happens to the pressure of supersonic air as it flows through a divergent nozzle?
• What is the primary advantage of an axial-flow compressor over a centrifugal compressor?
• Which option corresponds to the method used for internal inspection of an assembled turbine?
• Evaluate the simplification: 4b - 3(2b - 6).
• When the leading edge of a first-stage turbine blade shows stress rupture cracks, which condition should be suspected?
• In a table with two variables showing positive correlation, which is likely true?
• The purpose of a bleed valve located in the beginning stages of the compressor is to
• When comparing data sets, what does the mean measure?
• Which action most increases confidence in an inference drawn from a passage?
• The area of a circle with radius 5 is approximately what, using π ≈ 3.14?
• The diffuser's role in a turbine engine is to
• Why is word choice important when determining tone?
• A 25% discount on an $80 item reduces the price to what?
• What happens when the bleed air valve is opened during APU operation?
• When interpreting a line graph over time, what is most crucial?
• In an axial-flow compressor, one purpose of the stator vanes at the discharge end of the compressor is to
• Which standard step is performed after replacing the fuel control unit on a turbine engine?
• The non-rotating axial-flow compressor airfoils in an aircraft gas turbine engine are called
• What should be done initially if a turbine engine catches fire when starting?
• Which statement best describes a well-formulated hypothesis?
• Where are turbine nozzle diaphragms located relative to the turbine wheel?
• To accomplish APU engine cooling before shutdown when necessary, one method is to
• Jet engine turbine blades removed for detailed inspection must be reinstalled in which location?
• Which of the following best describes a counterargument?
• True or False: The main advantage ultra-high bypass fans have over high-bypass turbofans is lower fuel consumption rate to thrust.
• Simplify the expression: 3a - 2(a - 4).
• What is the volume of a rectangular prism with length 3, width 4, and height 5?
• Which engine variable is the most critical during turbine engine operation?
• Severe rubbing of turbine engine compressor blades will usually cause which damage?
• In a scatter plot, which statement indicates a positive relationship?
• When making an inference from a passage, what is the most reliable basis?
• What is the function of turbine nozzle diaphragms located on the upstream side of each turbine wheel in a gas turbine engine?
• What is the formula for the area of a circle?
• Unducted fan propellers reach peak efficiency at about 85%. What happens to efficiency if the operation pushes tip speeds higher beyond that point?
• In a dual-spool compressor, the low-speed compressor seeks its own best operating speed.
• Why is a control group important in an experiment?
• What is the primary factor which controls the pressure ratio of an axial-flow compressor?
• Which strategy helps identify author bias?
• Which statement best describes the fallacy 'post hoc ergo propter hoc'?
• Main bearing oil seals are typically what type?
• A pie chart shows portions of a whole. Which statement is true?
• Who establishes the recommended operating time between overhauls (TBO) of a turbine engine used in general aviation?
• Five workers complete a job in 8 days. How many days would 10 workers take, assuming a constant rate?
• Airlines of 400 passenger class will probably not convert to Unducted fan engine design.
• An advantage of the axial-flow compressor is its
• Between each row of rotating blades in a turbine engine compressor, the stationary blades that diffuse the air are called what?
• The air passing through the combustion chamber of a turbine engine is
• Dirt particles ingested into the compressor coat all components except which?
• Which statement correctly distinguishes a fact from an opinion?
• What is the function of the APU air inlet plenum?
• Which is an advantage of the centrifugal-flow compressor?
• The basic gas turbine engine is divided into two main sections: the cold section and the hot section. Which option correctly describes this statement?
• When synthesizing information from two passages, what is essential?
• Where is the diffuser section located in a typical jet engine?
• If a data set has a maximum value of 120 and a minimum value of 20, what is the range?
• What is the purpose of the diffuser section in a turbine engine?
• Who establishes mandatory replacement times for critical turbine engine components?
• What is the primary purpose of compressor field cleaning on turbine engines?
• 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
• What is the proper starting sequence for a turbojet engine?
• Hot spots on the tail cone of a turbine engine are possible indicators of a malfunctioning fuel nozzle or
• Which blade types are used in turbines?
• Dirt particles ingested into the compressor tend to coat all components except which?
• In a convergent nozzle, subsonic flow, which statement is true?
• In a dual axial-flow compressor, the first stage turbine drives
• Generally, when starting a turbine engine, the starter should be disengaged
• In reasoning, which term describes declaring a causal relationship without evidence due to correlation?
• A reasoning fallacy occurs when a conclusion is drawn from insufficient evidence. What is this called?
• Inference vs assumption: which is supported by text evidence?
• What type of blades used on ultra-high bypass turbofan engines allows safe operation and higher tip speeds than conventional propeller blades?
• What happens to the pressure of subsonic air as it flows through a convergent nozzle?
• Which data display is particularly suited for showing where individual data points fall within a distribution?
• Which statement is true for subsonic flow in a convergent nozzle?
• In a time-series chart, which pattern indicates seasonal effects?
• What type of turbine blade is most commonly used in aircraft jet engines?
• What is used in turbine engines to aid in stabilization of compressor airflow during low thrust engine operation?
• Which compressor arrangement provides the greatest starting flexibility and high-altitude performance?
• If a turbine engine shows no change in power setting parameters but oil temperature is high, what is the possible cause?
• Which law is commonly referred to as the Law of Inertia?
• The blades on ultra-high bypass turbofan engines are made up of which three materials?
• Which of the following influences the operation of an automatic fuel control unit on a turbojet engine?
• Hot spots on the tail cone are possible indicators of a malfunctioning fuel nozzle or faulty combustion chamber.
• What describes a control group’s function?
• In a syllogism, if all dogs are mammals and all mammals are animals, what is the conclusion?
• Where do stress rupture cracks usually appear on turbine blades?
• Unducted Fan engines are expected to be how many times the size of current turboprop engines?
• In a reading passage, which statement best captures the main idea?
• If two variables show a perfect positive linear relationship on a scatterplot, how would the data points typically align?
• Which compressor arrangement is associated with split-spool architecture for starting flexibility?
• A hypothesis is best described as what?
• The new Prop fan will be fitted with how many high-load, swept-back, curved blades?
• Severe rubbing of compressor blades is most commonly associated with which damage mode?
• In turbine hot-section damage, which mechanism is most characteristic?
• Which statement about interpreting a line graph is true?
• What is the difference between a theory and a hypothesis?
• A turbine engine compressor which contains vanes on both sides of the impeller is which type?
• What determines the number of rows of stages in an axial-flow compressor?
• The volume of a rectangular prism with length 6, width 2, and height 3 is what?
• Which statement best describes the APU generator compared to engine-driven generators?
• The two types of centrifugal compressor impellers are which?
• In an axial-flow compressor, which statements about pressure stages are true?
• Which statement describes the purpose of a hypothesis in experimentation?
• Which statement is a valid conditional form?
• In the turbine section of a gas turbine engine, stators are reported to
• Standard sea level pressure is
• A mixture problem: 2 parts A at 20% and 3 parts B at 60% yield what overall percentage?
• Main bearing oil seals used with turbine engines are usually what type(s)?
• Generally, when maximum APU shaft output power is used with pneumatic power, pneumatic loading will be automatically modulated to maintain a safe
• The highest heat-to-metal contact in a jet engine occurs at which component?
• Which strategy is most effective for identifying author bias?
• Which system directly controls the timing and quantity of fuel delivered to the APU?
• What is the main purpose of skim reading headings and topic sentences before detailed reading?
• In a bar chart, how do you identify the largest category?
• From where is the APU fuel normally supplied during operation?
• Which mechanism is used to stabilize compressor airflow during low-thrust operation?
• When operating, the APU speed tends to
• Who establishes the recommended operating time between overhauls (TBO) of a turbine engine used in general aviation?
• Which turbine engine compressor offers the greatest advantages for starting flexibility and improved high-altitude performance?
• A purpose of the shrouds on the turbine blades of an axial-flow engine is to