General Aircraft Technical Knowledge Practice Test

These questions are part of the practice quiz. Start practicing

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