Exam (elaborations)
PROPULSION SYSTEMS EXAM QUESTIONS AND ANSWERS 2025
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PROPULSION SYSTEMS EXAM QUESTIONS AND ANSWERS 2025...
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Why do modern aircraft engines use two spark plugs in the combustionchamber? - ANSWER Modern aircraft aircraft engines use two spark plugs in
the combustion chamber for redundancy
What is the function of the spark plug? - ANSWER The function of the spark
plug is to provide a path for electricity to flow into the combustion chamber to
start the combustion process
True or False: The "E" gap is the point where the magneto fires. - ANSWER
True, the "E" Gap is the point where the magneto fires and the points open
True or False: The "E" gap is the position where the points open - ANSWER
True, the "E" Gap is the position where the points open and the magneto fires
True or False: The "P" lead refers to the wire attached to the magneto and
provides an electric ground path when the pilot performs a magneto ground
check. - ANSWER True, the "P" lead refers to the wire which attaches to the
magneto and provides an electric ground path when the pilot performs a
magneto ground check.
What is slip? - ANSWER Slip refers to the difference between effective pitch
and geometric pitch
What is the other name for the back side of the prop? - ANSWER The back
side of the prop is also known as the cambered side
What is the other name for the face side of the prop? - ANSWER The face side
of the prop is also known as the flat side
What is pitch distribution? - ANSWER Pitch distribution refers to the change
in blade angle at the different blade stations as measured from the hub to the tip
True or False: when the prop tip reaches the speed of sound, it looses a great
deal of efficiency - ANSWER true, when the prop tip reaches the speed of
sound, it loses a great deal of efficiency
, What controls the efficiency of a prop? - ANSWER The four things that
govern prop efficiency are:
1) Angle of Attack
2) RPM
3) Aircraft forward speed
4) Prop design
True or False: All modern aircraft use constant speed propellers - ANSWER
False, because jets are a thing
True or False: Modern multi-engine prop aircraft are equipped with full-
feathering propellers. - ANSWER True, all modern multi-engine prop aircraft
are equipped with full-feathering propellers.
Can reversing propellers be used to slow the aircraft during approach to the
runway? - ANSWER No because pilots are only supposed to reverse thrust on
the runway, not whilst approaching it
What is the most common type of starter in use today on recip engines? -
ANSWER The most common type of starter in use today on recip engines is
the direct cranking starter
True or False: Aircraft batteries are used to operate the ignition system on
magneto equipped reciprocating engine aircraft - ANSWER False, because
magnetos are self-sustaining systems
What type of starter do radial engines utilize? - ANSWER Radial engines
utilize an inertial starter
What is the most common type of propeller in use today? - ANSWER The
most common type of propeller in use today is the constant speed, aluminum
prop
What is the most common type of starter in use today on turbine engines? -
ANSWER The most common type of starter on turbine engines today is the air-
turbine starter
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