General Aircraft Technical Knowledge Practice Test

These questions are part of the practice quiz. Start practicing

• If plug fouling is a persistent problem a change of _____ may be required
• Capacitance-type contents gauges measure which physical property?
• What is the principle behind supercharging?
• What is the function of spark plugs?
• Capacitance gauge dielectric?
• Is there a carburetor in a turbocharger?
• Over boosting is most likely to occur when which condition occurs?
• In level flight with a fractured static line, altimeter reads higher than actual. Which option represents this condition?
• Which of the following is the primary method to avoid diesel knock by controlling fuel delivery timing?
• Are magnetos part of the aircraft electrical system?
• If takeoff is commenced with a completely blocked pitot tube, the airspeed indicator will show a reading that is
• Which components help maintain continuous fuel pressure during tank changes?
• In automatic control, what does the pilot set and what adjusts turbo charging?
• How many degrees are in two full revolutions of the crankshaft?
• What is the function of the lower piston rings?
• Regarding the main components of the piston engine, choose the correct statement.
• Are combustion temperatures in a diesel engine higher or lower than those in a gasoline engine?
• Exhaust manifold is:
• In carburetor heat, the heat exchanger is located around the ______ manifold.
• In a lean fuel-air mixture, which component remains present?
• What is the most effective way to prevent throttle ice?
• What is the function of the upper piston rings?
• Which gauge uses a float to vary resistance?
• During the power stage, the intake and exhaust valves are?
• What are fuel strainers?
• Diesel engines can achieve the same power as Avgas engines with larger displacement due to improved combustion efficiency.
• What component supports the crankshaft inside the crankcase?
• Air intakes are positioned so that advantage can be taken from the _________ developed behind the ________ and _______ air pressure in flight. This improves__________ efficiency
• Clearance volume is defined as which space in the cylinder?
• Where is a fuel shut off valve usually fitted?
• Which statement is true about volumetric efficiency under boosted conditions?
• Which term describes the ratio of the total cylinder volume above the piston at bottom dead center to the volume above the piston at top dead center?
• Which of the following is a recognized jet fuel type?
• What is the ideal gas equation as given in the material?
• What type of fuel is jet fuel?
• Why does supercharging increase the likelihood of detonation?
• Firing interval is defined as the interval between what events?
• Which instrument is commonly associated with a variable resistor gauge?
• What are the two types of waste gates?
• The exhaust manifold specifically serves to:
• What can the use of excessively higher grade of fuel cause?
• With low fuel contents fuel pressure will _______?
• The booster pump should be used for four things other than the event of an engine driven pump failure, what are they?
• Increasing the number of cylinders in an engine generally affects smoothness in what way?
• Which condition would maximize turbocharger boost?
• What colour is AVGAS?
• How is the crankshaft described with respect to throws for each piston?
• Where is the magna-stick kept?
• The vertical speed indicator (VSI) will briefly indicate a rate of climb after a static line fracture, then return to level flight. Which option reflects this?
• Swept volume is best described as which of the following?
• What is the bore of an engine cylinder?
• Capacitance type gauge consists of what?
• In a turbocharger, the speed of the turbine and impeller is controlled by what mechanism?
• At sea level, a supercharged engine compared to a normally aspirated engine of the same size typically has:
• What is the role of a lever in a pilot-operated waste gate control system?
• Is turbocharging active when the waste gate is fully open?
• In most carburetor heat systems, warm air is drawn initially from the ______ compartment and further heated by being passed through a muff or heat exchanger around the ______ manifold, before being ducted to the carburetor.
• What is the compression ratio formula?
• Diesel engines generally require what type of cooling system?
• Which of the following describes the function of manifolds?
• What is the typical diesel combustion temperature range?
• Which factor affects volumetric efficiency?
• What ignition method do diesel engines primarily use?
• Correcting indicated airspeed (IAS) for pressure and instrument error yields which speed?
• If the EDP fails, what will happen to fuel pressure?
• Which statement about carburetors in turbocharger installations is true?
• What is the function of the primer in a carburetor-equipped engine?
• What does a piston do?
• In a normal combustion in a diesel engine, injection starts about ____ degrees BTDC
• Valve lead is the ...
• What is the magnetic float on a magna-stick used for?
• Supercharging primarily helps by compensating for decreased air density at altitude, enabling performance similar to sea level.
• For a four-cylinder engine, which firing order is listed?
• The ______ enters the centre of the impeller and is ______ by the ______ force toward the ______ where it enters the ______.
• What is the purpose for an expansion space in the fuel tank?
• In carb engines the inlet valves are cooled by
• Which component best prevents fuel surging inside the tank?
• High compression ratio engines run fairly _______ therefore have _________ spark plugs.
• The crank angle is defined as:
• In the compression ratio formula, which term represents the volume displaced by the piston as it moves within the cylinder?
• What is the purpose of the impeller in a turbocharger?
• From the diffuser onward, the flow is directed into the engine's induction system. Which sequence is correct?
• Which statement best defines the engine cycle?
• What colour is Jet Fuel?
• Primers are used on engines with carburetors?
• Where are superchargers/turbochargers located?
• Which of the following is a disadvantage of air-driven gyros?
• What are the two main types of contents gauges?
• Diesel engines have ____% better fuel consumption than an Avgas engine.
• Carburetor heat results in heated air being less dense than ambient air.
• During the power (expansion) stroke, in which direction does the piston move?
• In the context of fuel delivery, which term describes a system that delivers fuel at low pressure?
• In the Otto cycle, the induction stage involves which valve condition according to the provided material?
• Which energy source powers the turbine in a turbocharger?
• Why are inlet and exhaust valves fitted?
• In an automatic variable wastegate system, which component is used to vary boost to meet the required manifold pressure?
• What is the primary function of glow plugs during starting?
• If exhaust fumes are entering the cockpit, ventilation with fresh air should be immediately ______ and the incident reported after ______.
• Which statement best describes a crankshaft?
• Which statement about jet fuel and piston engines is true?
• Static line fracture in level flight can cause the ASI and altimeter to read high, with the VSI briefly showing a climb before leveling. Which option correctly describes this scenario?
• The limit to the amount of supercharging that can be applied is the ______ rise caused by compressing the mixture and the liability to cause ______.
• What factor causes reduced RPM in an air-driven gyro?
• Fuel tanks are normally vented to the __________?
• Which component delivers spark to the correct cylinder in the proper sequence?
• With fixed waste gate systems, overboost can lead to ______.
• Which statement best describes the overall effect of the impeller's swirling action?
• Generally three systems are used to vary the position of the waste gate, which are they?
• In a single staged supercharger, the position of the throttle butterfly is governed by two things. What are they?
• What is the distributor in an aircraft ignition system?
• How does over boosting occur?
• What is the purpose of the scraper rings?
• Diesel knock is caused by which of the following phenomena?
• Compression ratio is the ratio of which quantities?
• The use of a lower grade of fuel than designed for the engine can lead to ?
• The piston is least affected by pressure changes when near which positions?
• Variable waste gate systems have what to dump any over-boosted air?
• Stroke is defined as what distance?
• Increasing the number of cylinders generally affects engine smoothness in what way?
• Which component attaches pistons to the crankshaft?
• When EAS is corrected for density error you obtain which speed?
• Positioning air intakes to take advantage of ram air and propeller slipstream improves which aspect of engine performance?
• What will a high wing fuel injected engine require?
• In the ideal gas equation PV = RT, which symbol represents volume?
• Which statement is true about typical fuel system configurations described?
• When the throttle is partially closed on a supercharged engine, why does MAP decrease?
• In a variable resistance type fuel contents gauge, what component moves to vary resistance?
• What is a magna-stick?
• The booster pump is commonly used during which flight phase to ensure fuel supply?
• Which statement describes the AVGAS color code?
• What do the numbers 100/130 in AVGAS indicate?
• Which term describes a fuel delivery method that operates at low pressure before the fuel enters the engine?
• If the static port becomes iced during descent, what will happen to the trapped static pressure and the airspeed indicator reading?
• The swirling action imparted by the impeller improves the ______ of ______ and ______.
• How can plug fouling be remedied?
• Using the firing interval formula, which expression gives the firing interval?
• An air-cooled piston engine has greater combustion efficiency than a diesel engine.
• Which result is associated with designs aimed at producing better mixing of fuel and air in the cylinders?
• In a capacitive fuel gauge, how does the fuel-air ratio affect the gauge reading?
• In the compression stage of the Otto cycle, what is the state of the valves?
• Why must care be taken not to exceed manifold pressure at low altitudes in a supercharged engine?
• When CAS is corrected for compressibility error you obtain which speed?
• What makes exhaust driven turbochargers more efficient than mechanically driven superchargers?
• Spark plugs are installed in aero engines in which location?
• What are the types of Jet fuel?
• Low compression ratio engines run cool and have hot plugs. True or False?
• Manifold pressure is the pressure of the air inside which component?
• Why shouldn't MOGAS be used in aviation engines?
• A booster or auxiliary pump is generally fitted in case of an ________ failure.
• Which component sends sparks to cylinders in the proper sequence?
• The viscosity valve or thermostat operates the oil cooler bypass valve when the oil is cold.
• What should be bonded to the aircraft when refueling?
• Does a Diesel engine have a throttle valve?
• What property of a dielectric is utilized in fuel gauge operation?
• AVGAS 100/130 is primarily known for which characteristic?
• In the ideal gas equation PV = RT, which symbol represents temperature?
• Diesel aero-engines can be expected to produce the same power as an Avgas engine when the diesel engine’s cylinder capacity is more than how many times larger than the Avgas engine’s capacity?
• Which statement describes the appearance of AVGAS labeling?
• What powers the turbine in a turbocharger?
• What is the full name of lead added to aviation fuel?
• Pre-ignition is defined as ignition of the charge by some means other than the normal spark before ignition is timed to occur.
• The higher the compression ratio the higher/lower the grade of fuel required?
• The induction system for a normally-aspirated engine comprises three main sectors. Which option lists them correctly?
• Would a 1:18 mixture still be within the workable ignition range?
• In aviation engines, which component forms the boundary of the combustion space at the top of the cylinder?
• What causes the electrical signal change in a variable resistor type fuel contents gauge?
• Some tanks are designed to have an internal pressure which is higher or lower than ambient pressure? This reduces what in the tank
• Carb heat reduces power due to which of the following reasons?
• What is the function of magnetos?
• What are the benefits of supercharging in terms of density and sea level power?
• For a four-cylinder engine, what is the firing interval in degrees?
• Which condition would result in no turbocharging?
• The induction manifold specifically serves to:
• Which statement about the distributor is correct?
• In a supercharged engine, a leak in the inlet manifold causes loss in the inlet manifold pressure and mixture at high power settings, resulting in reductions in which two items?
• Which sequence correctly shows the order of speed corrections from indicated airspeed to true air speed according to the material?
• In the induction stage of the Otto cycle the inlet valve is:
• Does the piston travel farther in the first 90 degrees or the second 90 degrees?
• Firing order is:
• Which three components form the induction system in a normally-aspirated engine?
• Besides being located at each tank, fuel strainers may also be located at which components?
• Fuel samples should be taken in what type of container?
• Which of the following statements about the induction system is true?
• In a typical four-stroke engine, the crankshaft runs at half engine speed.
• Cold intake air is preferred over hot air because it is ________.
• In capacitive gauges, what changes with the fuel-air ratio?
• In an exhaust driven supercharger (turbocharger), the turbine is coupled to and drives a ______.
• What best describes glow plugs?
• Which statement about AVGAS labeling color coding is correct?
• A mixture with a ratio of 1:9 is considered
• When the CSU changes power, the change is shown on MAP or RPM?
• What happens when the aircraft climbs to the attitude where the throttle is fully opened by the servo to maintain the MAP selected?
• Low wing aircraft sometimes require a fuel pump.
• Which term describes the rapid fluctuations of cylinder pressure caused by too rapid combustion in a diesel engine?
• The dipstick takes into account only usable fuel.
• The primer must be in the LOCKED position for flight to prevent over rich mixtures.
• In a 1:15 fuel-air mixture, what does the 15 represent?
• If the waste gate is opened, what happens to the exhaust gases?
• Which statement best describes the function of the upper piston rings?
• Which description matches the AVTUR color code?
• Crank angle is:
• Jet fuel is described as which type of fuel?
• The rise in temperature caused by compression in a supercharger serves which primary purpose for the fuel?
• The transmission of power from the connecting rod to the crankshaft is most effective when the angle between the connecting rod and the crank-web is at what value?
• To avoid manifold pressure risk and detonation, care must be taken to ?
• The air entering the carburetor/throttle unit should be clean and _______
• Ensure the dipstick is ___________ when put into the tank.
• What are the three main types of mixture control?
• If the tank vents block, what happens to fuel pressure?
• Where do big end bearings fit?
• A fuel shut off valve is typically incorporated with which component?
• Which statement best describes the risk of drum stock fuel?
• Where are fuel strainers usually located?
• Which of the following is true about air-driven gyros?
• Pistons are made of which material?
• Diesel engines will have a compression ratio below __:__ to prevent diesel knock
• What type of Avgas is available in New Zealand e.g number/number ?
• How is manifold pressure maintained when the pilot selects MAP and the aneroid capsule responds?
• Which description matches the AVTUR label?
• Cylinder heads are usually made of which material?
• Which sources does an airspeed indicator use for readings?
• What is the function of the inlet manifold?
• Why are fuel samples taken?
• What are the two types of aircraft fuel systems?
• Diesel engines can be made to run on a wider range of less-volatile fuels than a gasoline engine. True or False?
• The higher the compression ratio the better __________ efficiency?
• Best volumetric efficiency is provided by using which intake?
• Which stroke is responsible for expelling the combustion products from the cylinder?
• What do fuel booster and auxiliary pumps ensure when changing tanks?
• What is the fuel-air ratio for best economy?
• Is turbocharging active when the waste gate is fully closed?
• What is the fuel-air ratio for maximum power output?
• From the diffuser, the higher pressure mixture is led into the ______ manifold and then to the ______.
• Which of the following is NOT listed as a measure to help avoid diesel knock?
• Are air intakes usually forward facing?
• High wing aircraft always require a fuel pump.
• Which component provides the gas-tight seal when inlet and exhaust valves are closed?
• Induction manifold is:
• Which device protects main fuel pumps against excessive pressure?
• What does the first number in 100/130 relate to?
• Ram air in the engine intake is:
• In the power stage of the Otto cycle, what is closed and what is ignited?
• Higher compression ratios require which change in fuel grade?
• Which of the following is a means of engine cooling?
• In high-wing carburetted engine installations, gravity feed can supply fuel to the carburetor.
• Which statement about volumetric efficiency is true?
• What is the function of the cylinder heads?
• The workable limits for reliable ignition by spark plug range from as rich as to as lean as?
• Proper seal of the exhaust manifold is important why?
• Which wing configuration is most likely to rely on gravity feed for carbureted fuels?
• In a diesel engine, how is the fuel introduced into the combustion system?
• What is the optimal angular relationship between the connecting rod and the crank-web for power transmission?
• In a fuel system the main pumps are engine driven, and have what to prevent high pressures?
• In a turbocharger the impeller handles fuel-air mixture: true or false?
• In the ideal gas equation PV = RT, which symbol represents pressure?
• What is a key difference between diesel engines and gasoline engines?
• What is the diesel term for detonation?
• The principle of supercharging is to ______ the density of the fuel-air charge, before it enters the ______.
• In an automatic variable wastegate system, the pilot sets the required manifold pressure with the ____ and, through the use of an ____ capsule or other sensor, the positioning of the ____ is automatically varied to obtain the required turbocharging.
• Low compression ratio engines run hot and have cold spark plugs. True or False?
• Which of the following best describes the diffuser's effect on the airflow?
• How does a magna stick work?
• What does the last number in 100/130 relate to?
• Which sequence correctly lists the four strokes of a typical four-stroke engine?
• Why extra care when using fuel from a drum stock?
• What are internal baffles in a fuel tank?
• The principle of supercharging allows sea level pressure to be maintained to a higher altitude and sea level output can be maintained.
• In automatic control, which component adjusts the amount of turbo charging?
• Why is sealing at the joints in the inlet manifold important?
• A single stage supercharger has ______ impeller.
• Why are diesel engines typically heavier than gasoline engines?
• Manifolds are:
• In a turbocharger system, the speed of the turbine (and therefore the impeller and amount of supercharging) is controlled by the position of the ______ gate.
• Where are superchargers/turbochargers located in relation to the carburetor and inlet manifold?
• What are glow plugs?
• What is the function of the camshaft in an internal combustion engine?
• What is the function of inlet and exhaust valves?
• What is cross feed system?
• Which component senses atmospheric pressure and adjusts the throttle butterfly in a supercharged engine?
• What is the CCM (Chemically Correct Mixture) ratio?
• Which statement about supercharging effect on density is true?
• Where are spark plugs fitted in aero engines?
• What is the function of connecting rods?
• What is the function of the aneroid capsule in a supercharged engine?
• In the exhaust stage of the Otto cycle, is the exhaust valve open or closed?
• The speed of combustion depends on
• What is the function of the exhaust manifold?
• What is the role of the stationary case around the impeller in a supercharged engine?
• In a fixed waste gate system, the proportion of exhaust gas going through the turbine is ______.
• What does TAS stand for in aircraft speed terminology?
• Because of lower air density, a normally aspirated engine will have approximately ______% of its sea level performance by the time it has reached ______ ft.
• The piston is least affected by pressure changes when it is near which positions?
• If a four-stroke engine has 720 degrees per cycle and four cylinders, what is the firing interval?
• When carb heat is selected, there is a ______ in manifold pressure because there is a ______ in ram air pressure. There is ______ restriction on the airflow and the heated air is ______ dense than previously.
• What are turbochargers?
• Can Jet Fuel be used in piston engines?
• A Geared supercharger is driven ______.
• How are inlet and exhaust valves held firmly closed?
• Which option describes throttle ice prevention?
• Detonation is:
• Throttle icing occurs mainly at high/low throttle settings?
• The turbocharger turbine creates a ______ pressure in the exhaust system which leads to a ______ in overall efficiency.
• Air intakes are usually forward or back facing?
• Why are fuel tanks filled up at the end of the day?
• Which statement about volumetric efficiency in boosted engines is true?
• Does a Diesel engine have a carburetor?
• Function of the Diffuser in a supercharged engine?
• In a supercharger, the temperature rise due to compression ensures two things: 1) complete vaporization of fuel; 2) more even delivery of the mixture to the cylinders.
• What describes the camshaft's function?
• Which statement describes capacitive sensing in fuel gauges?