Aircraft Electrical Systems Card
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Transcript of Aircraft Electrical Systems Card
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7/31/2019 Aircraft Electrical Systems Card
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1. . How is a wire bundle
protected from
chafing where the
bundle goes through a
hole in a fuselage
frame or bulkhead?
The edges of the hole are covered
with a flexible grommet, and the
bundle is secured to the structure
with a cushioned clamp.
2. Does an aircraft
engine electric starter
use a series or a
parallel motor?
A series-wound motor.
3. How can the direction
of rotation of the
armature of a DC
shunt-wound electric
motor be reversed?
By reversing the connections to the
shunt field coil with reference to the
armature.
4. On which wing is the
red navigation light?
On the left wing.
5. What is meant byflashing the field of a
generator?
Restoring the residual magnetismto the frame of the generator. This
is done by passing battery current
through the field coils in the
direction it normally flows when
the generator is operating
6. What is the main
disadvantage of
aluminum wire over
copper wire for use in
an aircraft electrical
system?
Aluminum wire is more brittle than
copper. It is more subject to
breakage when it is nicked or when
it is subjected to vibration.
7. What is the maximum
number of wires that
should be connected
to any single stud in a
terminal strip?
Four
8. What is the smallest
size aluminum wire
that is approved for
use in aircraft
electrical systems?
Six-gage.
9. What kind of clamp is
used to secure a wirebundle to the aircraft
structure?
A cushioned clamp.
10.What kind of fault can
be found in a
generator armature
with a growler?
Shorted coils.
11.What kind of
instrument would you
use to measure very
high resistance?
A megohmmeter. Megger is the
registered trade name of such an
instrument.
12.What kind of rectifier
is used in the small DC
alternators installed in
most light aircraft?
Six silicon diodes arranged in a
three-phase, full-wave rectifier
13.What size aluminum
wire would be proper
to replace a piece of
four-gage copper wire?
Two-gage. When you substitute
aluminum wire for copper wire,
use a wire that is two gage
numbers larger.
14.What size generator
must be used in an
aircraft electrical
system if the connected
electrical load is 30
amps, and there is no
way of monitoring the
generator output?
When monitoring is not practical,
the total continuously connected
electrical load must be no more
than 80% of the rated generator
output. This would require a
generator with a rating of 37.5
amps. Practically, a 40-amp
generator would be installed.
15.What three things
must be synchronizedbefore an aircraft AC
generator is placed on
the same bus with
another AC generator?
The voltage, the frequency, and
the phase rotation.
16.What two things must
you take into
consideration when
selecting the wire size
to use in an aircraft
electrical system
installation?
The current carrying capability of
the wire and the voltage drop
caused by the current flowing
through the wire.
17.When is it importantthat aircraft electrical
system wire bundles be
enclosed in some type
of conduit?
Any time a wire bundle is routed inan area where it is subject to
abrasion or rough handling, it
should be enclosed in a conduit.
18.Why are solderless
splices usually better
than soldered splices
in the wiring of an
aircraft electrical
system?
Soldered joints are usually stiff,
and vibration can harden the wire
and cause it to break. Solderless
splices are designed to keep the
joint flexible so vibration cannot
cause the wire to break.
19.Why must a switch be
derated if it is used in
a circuit that supplies
incandescent lamps?
The high inrush current caused by
the low resistance of the cold
filaments requires that the
switches be derated.
aircraft electrical systemsStudy online at quizlet.com/_2id6l