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(ALL) AMT Airframe & General Oral Exam Questions With Correct Answers Graded A+.pdf
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(ALL) AMT Airframe & General Oral[Date] Exam Questions With Correct
Answers Graded A+
EUNICE
[COMPANY NAME]
,AIRCRAFT ELECTRICAL SYSTEMS - Answers:AIRCRAFT ELECTRICAL SYSTEMS
What could cause an AC electric motor to run too fast? - Answers:Excessive applied voltage or
shorter field windings.
What tool is used to check a motor or generator armature for shorts & opens under load
conditions? - Answers:A Growler.
When using a Growler, what indication will occur when a short exists between an armature
segment? - Answers:When a metal blade is held over the armature & a short exists in a segment,
the blade will begin to vibrate & "chatter."
How is the output voltage of an alternator controlled? - Answers:By varying the field current that
excites the alternator.
What instruments are used to monitor electrical system loads? - Answers:Ammeters &
voltmeters.
How would you identify a specific wire in a wire bundle? - Answers:By the identification code
marked on the wire.
What tool would you use to determine the size of an unmarked wire? - Answers:A wire gauge.
What color are the navigation lights on the wingtips? - Answers:The left wingtip is red, the right
is green.
Name several types of electrical devices that would be considered intermittent loads on the
electrical system. - Answers:Landing gear, cowl & wing flap motors, radio transmitters.
Why would it be necessary to analyze an electrical system before increasing the load on the
system? - Answers:To determine that the generator capacity, wire size, & protective device
capacity will not be exceeded.
,What factors should be considered when determining the wire size for a particular application? -
Answers:The system voltage, permissible voltage drop, current to be carried, wire length &
whether the load is continuous or intermittent.
What is the relationship between the inside diameter of a conduit & the outside diameter of the
wire bundle inside it? - Answers:The conduit must be 25% larger than the wire bundle.
What is the maximum number of terminal lugs that can be placed on a single terminal strip stud?
- Answers:Four.
What is the proper length for a bonding jumper? - Answers:As short as practical, but long
enough to allow free movement of the component.
Under what conditions must a switch be derated from its nominal rating? - Answers:When used
with inductive circuits, circuits with high in-rush current, & with DC motors.
At what point do electric motors draw the most current? - Answers:When starting.
Circuit breakers are designed to open before what condition occurs? - Answers:Before the wire
emits smoke.
At what point in a circuit should the protective device be located? - Answers:As close to the
power source as possible.
What type of circuit breaker may not be used in an aircraft? - Answers:An automatic resetting
type.
What part of an aircraft is identified by a white navigation light? - Answers:The tail.
What could cause an AC electric motor to run slowly? - Answers:Lack of lubrication, defective
wiring, or low applied voltage.
, What would be done when making bonding or grounding connections between dissimilar
materials? - Answers:Use a suitable washer so that any corrosion will occur on the washer.
Prior to making a continuity check, what must be done to an electrical circuit? - Answers:The
power must be turned off.
Why must a switch be derated if it is used in a circuit that supplies incandescent lamps? -
Answers:The high-inrush current caused by the low resistance of the cold filaments required that
the switches be derated.
What is an SPDT switch? - Answers:A single-pole, double-throw switch.
Where could you find the part number of a switch in an aircraft electrical system? - Answers:In
the equipment table of bull of materials on the electrical circuit diagram for the aircraft.
If no specific instructions are available, which way should the operating handle of an electrical
switch move to turn a component on? - Answers:Forward or upward.
What is meant by a trip-free circuit breaker? - Answers:A circuit breaker that cannot be closed
while a fault exists, regardless of the position of the operating handle.
What is meant by a slow-blow fuse? - Answers:A fuse that will allow more current than its rating
to flow for a short period of time, but will open the circuit if more than its rated current continues
to flow.
What is the function of a fuse or circuit breaker in an aircraft electrical circuit? - Answers:It
protects the wiring form an excess of current. It will open the circuit if enough current flows to
heat the wire until the insulation begins to smoke.
What are two principles upon which circuit breakers operate? - Answers:Magnetic circuit
breakers open a circuit when the current creates a strong enough magnetic field. Thermal circuit
breakers open a circuit when the current causes enough heat.
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