Exam (elaborations)
PROPULSION EXAM 2 QUESTIONS AND VERIFIED ANSWERS
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PROPULSION EXAM 2 QUESTIONS AND VERIFIED ANSWERS...
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the complete induction system for an aircraft engine includes three principalsections - ANSWER 1. air scoop and ducting
2. carburettor and air control sections
3. the intake manifold and pipes
ducting system for a naturally aspirated engine - ANSWER 1. air scoop
2. air filter
3. alternate air valve
4. carburettor heat air valve or heater muff
2 what is installed at the air scoop to remove dirt, abrasive particles, sand, and
large foreign materials before entering the engine - ANSWER the induction air
filter
how do air filters affect air pressure - ANSWER it reduces somewhat,
reducing power output
alternate air filter - ANSWER used to allow air to flow to the engine if the air
filter or other parts of the induction system should become clogged
other functions of the alternate air valve - ANSWER to allow warm air to enter
the induction system in order to counteract carburetor icing
carb heat air valve - ANSWER a gate which closes the main air duct and opens
the duct to the heater muff when the control is on
Carb heat results in what - ANSWER a loss of power because warm air is less
dense than cool air
what does the intake manifold do - ANSWER sends pressurized fuel-air
mixture into the cylinders
when would you notice a leak in the intake manifold - ANSWER at a low
RPM setting
, 3 types of induction icing - ANSWER 1. impact
2. fuel evaporation
3. throttle
what is a sign of induction icing - ANSWER reduction in power
fixed pitch prop see a decrease in RPM and constant speed props see a decrease
in manifold pressure and decrease in engine power with constant RPM
purpose of superchargers and turbochargers - ANSWER allow an engine to
develop maximum power for operation at high altitudes or for boosting engine
power on takeoff. they help to overcome the decrease in air density as an
aircraft gains altitude
how is a supercharger driven - ANSWER by gearing from the crankshaft or by
the exhaust gases
what is a supercharger - ANSWER a turbocharger that boosts the air intake
pressure above 30inHg
what is a normalizer - ANSWER an air compressor that raises the pressure, but
not above 30inHg. It is used to compensate for decreased air density at altitude,
not supercharging.
the capacity of the supercharger depends on what - ANSWER the size of the
impeller and the speed it is rotated
what is manifold absolute pressure - ANSWER the pressure of the intake
manifold of an engine
what are the levels of MAP in a normally aspirated engine - ANSWER MAP is
less than outside atmospheric pressure because of the air friction losses in the
air induction system
if MAP is too high... - ANSWER detonation and overheating will occur
when air is compressed - ANSWER its temperature increases
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