ASA POWERPLANT ORAL EXAM LATEST EXAM
| ALL QUESTIONS AND CORRECT ANSWERS |
ALREADY GRADED A+ | VERIFIED ANSWERS |
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What are two reason Prist is used in turbine engine fuel? ------CORRECT
ANSWER---------------Prist is an antifreeze agent that lowers the freezing
point of any water that precipitates out of the fuel. It also acts as a biocidal
agent that kills the micobial growth that forms scum in fuel tanks. This scum
traps and holds water against the aluminum alloy in the fuel tanks and
causes corrosion
Why do some aircraft fuel filters have a built-in relief valve? ------CORRECT
ANSWER---------------This relief valve will open and allow unfiltered fuel to
flow to the fuel control device if the filter should become plugged with ice or
other contaminants
Where is the heat taken form that is used to heat the induction air in a recip
engine? ------CORRECT ANSWER---------------From a muff that is installed
around some part of the exhaust system
Where does the alternate air come from that is used with a pressure carb
or a fuel injection system? ------CORRECT ANSWER---------------From
inside the engine cowling
Where does carb ice normally form in a carb? ------CORRECT ANSWER----
-----------In the throat of the carb, on and around the throttle valve
,Does the applicaiton of carb heat cause the fuel-air mixture to become
richer or to become leaner? ------CORRECT ANSWER---------------Heated
air cause the fuel-air mixutre to become richer
What is used to drive most of the external superchargers on modern
reciprocating engine? ------CORRECT ANSWER---------------Exhaust gases
What controls the speed of a turbocharger compressor? ------CORRECT
ANSWER---------------The amount of exhaust gas that is forced to flow
through the turbine. This is controlled by the position of the waste gate
What is meant by a convergent inlet duct for a turbine engine? ------
CORRECT ANSWER---------------A convergent duct is one which cross-
sectional area becomes smaller in the direction the air flows
What is checked when a Magneto is internally time? ------CORRECT
ANSWER---------------Internally timing a Magneto consists of adjusting the
breaker points so that they will open at the instant the rotating magnet is in
the E Gap position, and the distributor rotor is in a position to direct the
high-voltage to cylinder number one.
And what position should the ignition switch be placed when using a timing
light on the Magneto's? ------CORRECT ANSWER---------------In the both
position.
What type of ignition system is used on most turbine engines? ------
CORRECT ANSWER---------------High-intensity, intermittent Duty, capacitor
discharge ignition systems.
,What is the E Gap in the Magneto timing? ------CORRECT ANSWER---------
------The E Gap angle is in the position of the rotating magnet when the
primary current flowing through the Magneto coil is in the greatest. The
breaker points open when the rotating magnet is in the e-gap position.
What is the function of an Impulse coupling? ------CORRECT ANSWER-----
----------An Impulse coupling is a spring driven coupling between the
Magneto and the engine. When the engine is being started, the impulse
coupling holds the rotating magnet until the Piston passes over it stops
interposition and starts down. The impulse coupling releases the magnet
and a spring spins it fast so that it can produce a hot and late spark.
How many igniters are used on most turbine engines? ------CORRECT
ANSWER---------------2.
What are two types of ignition systems used on turbine engines? ------
CORRECT ANSWER---------------High voltage systems and low voltage
systems.
With which type of turbine engine ignition system is a glow plug igniter
used? ------CORRECT ANSWER---------------A low-voltage system.
How is the strength of the magnet in a Magneto checked? ------CORRECT
ANSWER---------------The Magneto is put on a test and rotated at a specific
speed. The breaker points are held open and the primary circuit is
measured. The strength of the magnet determines the amount of primary
current.
, In what position is the magnet in a Magneto, when the greatest change in
flux density in the coil core takes place? ------CORRECT ANSWER-----------
----A few degrees be on its neutral position. When it is in this position, the
breaker points open and the primary current is interrupted. The flux change
and the coil core is the greatest.
In what position is the magnet in a Magneto when the breaker points begin
to open? ------CORRECT ANSWER---------------In it's e gap position, just a
few degrees Beyond its neutral position.
What malfunction in the igniter system would cause an aircraft
reciprocating engine to continue to run after the ignition switch is placed in
the off position? ------CORRECT ANSWER---------------The ignition switch is
not grounded in the Magneto primary circuit.
What kind of equipment is used to test an ignition harness for a
reciprocating engine? ------CORRECT ANSWER---------------A high voltage
electrical leakage detector.
What is an all-weather spark plug? ------CORRECT ANSWER---------------Is
shielded spark plug that has a recess in the shielding in which a resilient
grommet on the ignition lead forms a watertight seal.
What is meant by the reach of a spark plug? ------CORRECT ANSWER-----
----------The length of the threads on a spark plug that screw into the
cylinder head.
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