ASA POWERPLANT ORAL EXAM | ALL
QUESTIONS AND CORRECT ANSWERS |
GRADED A+ | VERIFIED ANSWERS | LATEST
VERSION | STUDY THIS ONE!
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.
What is the difference between a hot spark plug and a cold spark plug? -----
-CORRECT ANSWER---------------A hot spark plug has a long path for the
heat to travel between the nose core and Slater and the spark plug shell.
And a cold spark plug the heat has a shorter distance to travel, and the
spark plug operates cooler than a hot spark plug.
What is the advantage of fine wire spark plugs over massive electrode
spark plugs? ------CORRECT ANSWER---------------fine wire spark plugs
have a firing end that is more open than that of a massive electrode spark
, plug. The open firing and allows the gases that contain led to be purged
from the spark plug that so that they will not form solid lead contaminants.
Why is it important that the spark plugs be kept in numbered holes in a tray
when they are removed from an engine? ------CORRECT ANSWER----------
-----Spark plugs till a good deal about the internal condition of the cylinders
from which they were taken by knowing the cylinder from which each spark
plug came, the mechanic can take the proper action when they spark plug
indicates such conditions as detonation or overheating.
Why is it important that a torque wrench always be used when installing
spark plugs in an aircraft engine? ------CORRECT ANSWER---------------If
the spark plugs are not put in tight enough, there is a possibility of a poor
seal; if they are put into tight, there is a danger of cracking the insulation.
What kind of gauge should be used to measure the electrode Gap in
aircraft spark plugs? ------CORRECT ANSWER---------------A round wire
gauge.
What kind of electric starting system is used on many of the smaller turbine
engines? ------CORRECT ANSWER---------------A starter generator.
What happens when the start switch for a turbine engine with a starter
generator is place to the start position? ------CORRECT ANSWER------------
---Current flows into the starter relay which closes and actuates the ignition
Exciter. Current flows through the series motor coils of the starter generator
and rotates the engine until it starts.
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