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For a piston engine the chemically correct fuel/air ratio ? Exercise > lift > off

exemple question 162
Rich 9 1 correct 15 1 weak 20 1.


The function of the primer pump in a reciprocating engine is to ?

exemple question 163
The function of primer pump in a reciprocating engine to Provide additional fuel an engine start. Rich 9 1 correct 15 1 weak 20 1.


One of the advantages of a turbocharger is ?

exemple question 164
One of advantages of a turbocharger To make power available less affected altitude. Rich 9 1 correct 15 1 weak 20 1.


exemple question 165
Assume an initial condition at a high cruise altitude with a constant speed propeller what will happen if altitude decreased while throttle remains fully open and waste gate seized in cruise position The manifold absolute pressure (map) value may exceed maximum allowed value. with engine producing power at low altitudes turbocharger will be potentially over productive to prevent over boosting wastegate will allow surplus exhaust energy to bypass turbocharger at higher altitudes where air considerably less dense wastegate will close off allowing turbocharger to deliver selected boost during a descent from a high cruising altitude with throttle fully open turbocharger will be over productive the manifold absolute pressure (map) value may exceed maximum allowed value.


exemple question 166
If engine with a fixed pitch propeller detonating during climb out after takeoff normal corrective action would be to The manifold absolute pressure (map) value may exceed maximum allowed value. with engine producing power at low altitudes turbocharger will be potentially over productive to prevent over boosting wastegate will allow surplus exhaust energy to bypass turbocharger at higher altitudes where air considerably less dense wastegate will close off allowing turbocharger to deliver selected boost during a descent from a high cruising altitude with throttle fully open turbocharger will be over productive the manifold absolute pressure (map) value may exceed maximum allowed value.


exemple question 167
If when magneto selector switch set to off position a piston engine continues to r normally most probable cause that On a magneto grounding wire broken. The ignition system provides spark that ignites fuel/air mixture in cylinders is made up of magnetos spark plugs high tension leads the ignition switch a magneto uses a permanent magnet to generate an electrical current completely independent of aircraft's electrical system the magneto generates sufficiently high voltage to jump a spark across spark plug gap in each cylinder the system begins to fire when you engage starter the crankshaft begins to turn it continues to operate whenever crankshaft rotating most standard certificated airplanes incorporate a dual ignition system with two individual magnetos separate sets of wires spark plugs to increase reliability of ignition system each magneto operates independently to fire one of two spark plugs in each cylinder the firing of two spark plugs improves combustion of fuel/air mixture results in a slightly higher power output if one of magnetos fails other unaffected the engine will continue to operate normally although you can expect a slight decrease in engine power the same true if one of two spark plugs in a cylinder fails the operation of magneto controlled in cockpit the ignition switch the switch has five positions 1 off 2 r right 3 l left 4 both 5 start with right or left selected only associated magneto activated the system operates on both magnetos with both selected you can identify a malfunctioning ignition system during pretakeoff check observing decrease in rpm that occurs when you first move ignition switch from both to right then from both to left a small decrease in engine rpm normal during this check (around 100 to 150 rpm) if engine stops running when you switch to one magneto or if rpm drop exceeds allowable limit do not fly airplane until problem corrected the cause could be fouled plugs broken or shorted wires between magneto the plugs or improperly timed firing of plugs it should be noted that 'no drop' in rpm not normal in that instance airplane should not be flown following engine shutdown turn ignition switch to off position even with battery master switches off engine can fire turn over if you leave ignition switch on the propeller moved because magneto requires no outside source of electrical power the potential serious injury in this situation obvious loose or broken wires in ignition system also can cause problems for example if ignition switch off magneto may continue to fire if ignition switch ground wire disconnected if this occurs only way to stop engine to move mixture lever to idle cutoff position then have system checked a qualified aviation maintenance technician.


exemple question 168
Ignition occurs in each cylinder of a four stroke engine tdc = top dead centre Before tdc at each second crankshaft revolution. The ignition system provides spark that ignites fuel/air mixture in cylinders is made up of magnetos spark plugs high tension leads the ignition switch a magneto uses a permanent magnet to generate an electrical current completely independent of aircraft's electrical system the magneto generates sufficiently high voltage to jump a spark across spark plug gap in each cylinder the system begins to fire when you engage starter the crankshaft begins to turn it continues to operate whenever crankshaft rotating most standard certificated airplanes incorporate a dual ignition system with two individual magnetos separate sets of wires spark plugs to increase reliability of ignition system each magneto operates independently to fire one of two spark plugs in each cylinder the firing of two spark plugs improves combustion of fuel/air mixture results in a slightly higher power output if one of magnetos fails other unaffected the engine will continue to operate normally although you can expect a slight decrease in engine power the same true if one of two spark plugs in a cylinder fails the operation of magneto controlled in cockpit the ignition switch the switch has five positions 1 off 2 r right 3 l left 4 both 5 start with right or left selected only associated magneto activated the system operates on both magnetos with both selected you can identify a malfunctioning ignition system during pretakeoff check observing decrease in rpm that occurs when you first move ignition switch from both to right then from both to left a small decrease in engine rpm normal during this check (around 100 to 150 rpm) if engine stops running when you switch to one magneto or if rpm drop exceeds allowable limit do not fly airplane until problem corrected the cause could be fouled plugs broken or shorted wires between magneto the plugs or improperly timed firing of plugs it should be noted that 'no drop' in rpm not normal in that instance airplane should not be flown following engine shutdown turn ignition switch to off position even with battery master switches off engine can fire turn over if you leave ignition switch on the propeller moved because magneto requires no outside source of electrical power the potential serious injury in this situation obvious loose or broken wires in ignition system also can cause problems for example if ignition switch off magneto may continue to fire if ignition switch ground wire disconnected if this occurs only way to stop engine to move mixture lever to idle cutoff position then have system checked a qualified aviation maintenance technician.


8
The lubricating system of an air cooled piston engine used to Reduce internal friction provide cooling. The ignition system provides spark that ignites fuel/air mixture in cylinders is made up of magnetos spark plugs high tension leads the ignition switch a magneto uses a permanent magnet to generate an electrical current completely independent of aircraft's electrical system the magneto generates sufficiently high voltage to jump a spark across spark plug gap in each cylinder the system begins to fire when you engage starter the crankshaft begins to turn it continues to operate whenever crankshaft rotating most standard certificated airplanes incorporate a dual ignition system with two individual magnetos separate sets of wires spark plugs to increase reliability of ignition system each magneto operates independently to fire one of two spark plugs in each cylinder the firing of two spark plugs improves combustion of fuel/air mixture results in a slightly higher power output if one of magnetos fails other unaffected the engine will continue to operate normally although you can expect a slight decrease in engine power the same true if one of two spark plugs in a cylinder fails the operation of magneto controlled in cockpit the ignition switch the switch has five positions 1 off 2 r right 3 l left 4 both 5 start with right or left selected only associated magneto activated the system operates on both magnetos with both selected you can identify a malfunctioning ignition system during pretakeoff check observing decrease in rpm that occurs when you first move ignition switch from both to right then from both to left a small decrease in engine rpm normal during this check (around 100 to 150 rpm) if engine stops running when you switch to one magneto or if rpm drop exceeds allowable limit do not fly airplane until problem corrected the cause could be fouled plugs broken or shorted wires between magneto the plugs or improperly timed firing of plugs it should be noted that 'no drop' in rpm not normal in that instance airplane should not be flown following engine shutdown turn ignition switch to off position even with battery master switches off engine can fire turn over if you leave ignition switch on the propeller moved because magneto requires no outside source of electrical power the potential serious injury in this situation obvious loose or broken wires in ignition system also can cause problems for example if ignition switch off magneto may continue to fire if ignition switch ground wire disconnected if this occurs only way to stop engine to move mixture lever to idle cutoff position then have system checked a qualified aviation maintenance technician.


9
The first indication of carburettor icing in aeroplanes equipped with constant speed propellers during cruise would most likely be a Decrease in manifold pressure. On engines fitted with constant speed propellers a drop in power indicated a drop in manifold pressure rpm remaining constant.


10
The mixture control a carburettor achieves its control Varying fuel supply to main discharge tube. On engines fitted with constant speed propellers a drop in power indicated a drop in manifold pressure rpm remaining constant.


11
The mechanism to change propeller blade angle of a small piston engine aeroplane in flight operated Hydraulically engine oil. On engines fitted with constant speed propellers a drop in power indicated a drop in manifold pressure rpm remaining constant.


12
The use of too low an octane fuel may cause Hydraulically engine oil. On engines fitted with constant speed propellers a drop in power indicated a drop in manifold pressure rpm remaining constant.


13
Which one of following factors would be most likely to increase possibility of detonation occurring within a piston engine Using too lean a fuel/air mixture. Detonation nothing less than a series of small explosions that take place within an engine's combustion chambers it can be extremely destructive breaking pistons rod bearings anything else from pistons down that a large hammer could damage weak air/fuel mixtures can result in very uneven mixtures within chamber uneven burning pressure spikes detonation.


14
Vents in oil tanks are primarily to Prevent excessive pressure from building up in tank. Detonation nothing less than a series of small explosions that take place within an engine's combustion chambers it can be extremely destructive breaking pistons rod bearings anything else from pistons down that a large hammer could damage weak air/fuel mixtures can result in very uneven mixtures within chamber uneven burning pressure spikes detonation.


15
The cylinder head and oil temperatures may exceed their normal operating ranges if A lower octane rating than specified the engine used. Detonation nothing less than a series of small explosions that take place within an engine's combustion chambers it can be extremely destructive breaking pistons rod bearings anything else from pistons down that a large hammer could damage weak air/fuel mixtures can result in very uneven mixtures within chamber uneven burning pressure spikes detonation.


16
When starting engine or when engine running at idle rpm on ground mixture Rich to make starting possible to cool engine sufficiently when idling. Detonation nothing less than a series of small explosions that take place within an engine's combustion chambers it can be extremely destructive breaking pistons rod bearings anything else from pistons down that a large hammer could damage weak air/fuel mixtures can result in very uneven mixtures within chamber uneven burning pressure spikes detonation.


17
The cylinder head and oil temperature gauges are to exceed normal operating ranges if a pilot Uses fuel that has a rating lower than specified the engine. Detonation nothing less than a series of small explosions that take place within an engine's combustion chambers it can be extremely destructive breaking pistons rod bearings anything else from pistons down that a large hammer could damage weak air/fuel mixtures can result in very uneven mixtures within chamber uneven burning pressure spikes detonation.


18
The lubricating system of an aircraft engine used to Aid in dissipation of heat. Detonation nothing less than a series of small explosions that take place within an engine's combustion chambers it can be extremely destructive breaking pistons rod bearings anything else from pistons down that a large hammer could damage weak air/fuel mixtures can result in very uneven mixtures within chamber uneven burning pressure spikes detonation.


19
On design purpose relationship between fuel octane rating and maximum compression ratio of a piston engine The higher octane rating is higher maximum compression ratio is. Detonation nothing less than a series of small explosions that take place within an engine's combustion chambers it can be extremely destructive breaking pistons rod bearings anything else from pistons down that a large hammer could damage weak air/fuel mixtures can result in very uneven mixtures within chamber uneven burning pressure spikes detonation.


20
A magnetic plug in an engine oil system can be used to Collect ferrous particles. The most basic type of magnetic filter a drain plug where a magnet in shape of a disc or cylinder attached to its inside surface (typically adhesion) periodically magnetic plug removed inspected ferromagnetic particles which are then wiped from plug such plugs are commonly used in engine sumps gearboxes occasionally in hydraulic reservoirs one useful advantage of mag plugs relates to examining density of wear particles observed as a visual indication of wear rate occurring within machine over a fixed period of running time the appearance of these iron filings on magnets are often described in inspection reports using terms such as peach fuzz whiskers or christmas trees if one normally sees peach fuzz but on one occasion sees a christmas tree instead this would be a reportable condition requiring further inspection remediation.



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