Apart from flight into known icing conditions the intake system of a diesel engine ? Understand > topography
Is never heated because a diesel engine a injection engine.
The thermal efficiency of a diesel engine is higher than that of a petrol engine because ?
The thermal efficiency of a diesel engine higher than that of a petrol engine because The compression ratio much higher.
Given the following statements about diesel engines 1 power is regulated by the throttle valve 2 there is no throttle valve 3 power is set by the fuel flow 4 thermal efficiency is lower than that ?
Given following statements about diesel engines 1 power regulated the throttle valve 2 there no throttle valve 3 power set the fuel flow 4 thermal efficiency lower than that a petrol engine 5 diesel fuel less inflammable than petrol the combination that regroups all of correct statements The compression ratio much higher. There no mixture control no throttle valve power output of a diesel engine controlled regulating quantity of fuel that injected into cylinder (the amount of air constant) diesel engines are fitted with injectors not with valves. In liquid cooled engines compostion volume of coolant mixture 3 ethylene glycol 7 water. There no mixture control no throttle valve power output of a diesel engine controlled regulating quantity of fuel that injected into cylinder (the amount of air constant) diesel engines are fitted with injectors not with valves. The oil system a piston engine incorporates an oil cooler that fitted In return line to oil tank after oil has passed through scavenge pump. There no mixture control no throttle valve power output of a diesel engine controlled regulating quantity of fuel that injected into cylinder (the amount of air constant) diesel engines are fitted with injectors not with valves. Diesel engines always produce a certain amount of soot because The fuel droplets coming from atomiser do not burn completely. There no mixture control no throttle valve power output of a diesel engine controlled regulating quantity of fuel that injected into cylinder (the amount of air constant) diesel engines are fitted with injectors not with valves. What may happen during a continuous climb with a mixture setting fully rich Fouling of spark plugs. Carburetors are calibrated to operate with mixture control set to 'full rich' when operating at sea level as aircraft gains altitude it becomes necessary to reduce amount of fuel entering carburetor because amount of air automatically decreasing with altitude due to lower atmospheric pressure
if pilot fails to decrease amount of fuel as altitude gained result will be an overly 'rich' mixture creating problems such as fouled spark plugs excessive fuel consumption. 8 Prolonged running at low rpm can have an adverse effect on functioning of Fouling of spark plugs. Carburetors are calibrated to operate with mixture control set to 'full rich' when operating at sea level as aircraft gains altitude it becomes necessary to reduce amount of fuel entering carburetor because amount of air automatically decreasing with altitude due to lower atmospheric pressure
if pilot fails to decrease amount of fuel as altitude gained result will be an overly 'rich' mixture creating problems such as fouled spark plugs excessive fuel consumption. 9 When leaning mixture the most economic cruise fuel flow excessive leaning will cause High cylinder head temperature. Egt relative to temperature of charge as it burns within cylinder cht measures temperature of engine cylinder
the highest egt achieved at a ratio of 15 parts of air to one part of fuel
if ratio reduced ie rich charge temperature reduces due to excess fuel being left in cylinder if ratio greater than 15 1 ie lean or weak charge cooled excess air to appreciate why cht increases with lean mixtures we must consider speed at which fuel burns ie its flame rate lean mixtures burn slower than rich mixtures this means more heat transferred to engine components with lean mixtures
example if you move a lighted match quickly under your hand no problem but move it slowly you will burn your hand! slow burning lean mixtures will increase cht. 10 During climb with constant throttle and rpm lever setting mixture being constant Manifold absolute pressure (map) decreases. The manifold absolute pressure (map) indicates power output of a piston engine being a measure of pressure of fuel/air mixture in inlet manifold
in an unsupercharged engine reading will drop with height a given throttle setting because there less atmospheric pressure to push useful charge into cylinder. 11 Both gas turbine and piston engines use a cycle made up of induction compression combustion and exhaust phases which of these statements about a piston engine are correct or incorrect i the process in a piston engine intermittent ii theoretically combustion occurs at constant pressure I correct ii incorrect.
piston engine combustion process intermittent governed the rythm of back forth movements of piston in a cylinder the combustion occurs at constant volume in cylinder
turbine engine combustion process continuous occurs at constant pressure. 12 A piston engine compression ratio the ratio of Total volume to clearance volume.
compression ratio = volume at bottom dead (total volume) / volume at top dead (clearance volume)
the clearance volume the volume that not expelled from cylinder. 13 The purpose of a chip detector in oil system of an engine/gearbox to indicate that There are metal particles in oil. 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. 14 The thermal efficiency of a piston engine about There are metal particles in oil. Thermal efficiency the ratio of useful work to heat put in expressed as a percentage
the first law of thermodynamics states that energy may be changed from one form to another but cannot be destroyed as far as engines are concerned it means that heat mechanical work are mutually convertible that rate of exchande constant measurable
however second law says (more or less) that 'heat flows from a hot substance to a cold one unaided but energy from an external source needed it to flow other way' that is you might be able to convert most of your work into heat but turning heat into work will incur serious losses which another way of saying that engines are grossly inefficient if it were otherwise exhausts would be cold!
in fact engines waste as much energy in heat as power they produce approximate thermal efficiency of a four stroke engine 30. 15 On a normally aspirated engine non turbo charged manifold pressure gauge always indicates A lower value than atmospheric pressure when engine running. devidson
if engine on full power (i e butterfly valve fully open) admision pressure would be equal to atmospheric pressure on a non turbo charged engine no ?
no matter how wide butterfly throttle opened there will always be some restriction hence manifold pressure will always be lower than atmospheric even if only slightly. 16 The purpose of a distributor in an ignition system to distribute Secondary current to sparking plugs.
the purpose of ignition system to provide an ignition spark to proper cylinder at correct time in order to burn compressed air/fuel mixture
it consists of two separate but closely related electrical circuits
? low voltage primary circuit (battery voltage)
? high voltage secondary circuit (over 20000 volts)
the ignition coil the unit that takes your relatively weak battery power turns it into a spark powerful enough to ignite fuel vapor inside a a traditional ignition coil are two coils of wire on top of each other these coils are called windings one winding called primary winding other the secondary the primary winding gets juice together to make a spark the secondary sends it out door to distributor
the distributor 'distribute secondary current to sparking plugs. 17 Viscosity is The tendency of a liquid or gas to resist flow.
the purpose of ignition system to provide an ignition spark to proper cylinder at correct time in order to burn compressed air/fuel mixture
it consists of two separate but closely related electrical circuits
? low voltage primary circuit (battery voltage)
? high voltage secondary circuit (over 20000 volts)
the ignition coil the unit that takes your relatively weak battery power turns it into a spark powerful enough to ignite fuel vapor inside a a traditional ignition coil are two coils of wire on top of each other these coils are called windings one winding called primary winding other the secondary the primary winding gets juice together to make a spark the secondary sends it out door to distributor
the distributor 'distribute secondary current to sparking plugs. 18 With which instrument s do you monitor power output of an aeroplane fitted with a fixed pitch propeller The tendency of a liquid or gas to resist flow.
the purpose of ignition system to provide an ignition spark to proper cylinder at correct time in order to burn compressed air/fuel mixture
it consists of two separate but closely related electrical circuits
? low voltage primary circuit (battery voltage)
? high voltage secondary circuit (over 20000 volts)
the ignition coil the unit that takes your relatively weak battery power turns it into a spark powerful enough to ignite fuel vapor inside a a traditional ignition coil are two coils of wire on top of each other these coils are called windings one winding called primary winding other the secondary the primary winding gets juice together to make a spark the secondary sends it out door to distributor
the distributor 'distribute secondary current to sparking plugs. 19 In a piston engine turbocharger boost pressure may be monitored A manifold pressure gauge only.
the purpose of ignition system to provide an ignition spark to proper cylinder at correct time in order to burn compressed air/fuel mixture
it consists of two separate but closely related electrical circuits
? low voltage primary circuit (battery voltage)
? high voltage secondary circuit (over 20000 volts)
the ignition coil the unit that takes your relatively weak battery power turns it into a spark powerful enough to ignite fuel vapor inside a a traditional ignition coil are two coils of wire on top of each other these coils are called windings one winding called primary winding other the secondary the primary winding gets juice together to make a spark the secondary sends it out door to distributor
the distributor 'distribute secondary current to sparking plugs. 20 Fixed pitch propellers are usually designed maximum efficiency at A manifold pressure gauge only.
the purpose of ignition system to provide an ignition spark to proper cylinder at correct time in order to burn compressed air/fuel mixture
it consists of two separate but closely related electrical circuits
? low voltage primary circuit (battery voltage)
? high voltage secondary circuit (over 20000 volts)
the ignition coil the unit that takes your relatively weak battery power turns it into a spark powerful enough to ignite fuel vapor inside a a traditional ignition coil are two coils of wire on top of each other these coils are called windings one winding called primary winding other the secondary the primary winding gets juice together to make a spark the secondary sends it out door to distributor
the distributor 'distribute secondary current to sparking plugs. Exclusive rights: Content under private and protected license, reproduction prohibited and prosecuted.
