What is an important consideration when selecting a fuse or circuit breaker for a particular circuit?

The capacity of the fuse or CB meets the needs of the circuit

The overvoltage control protects the generator system when excessive voltage is present by

opening the shunt field circuit

Which are the major parts of a DC Motor?

Armature ass'y, Field ass'y, Brush ass'y, End Frame

In aircraft electrical systems, automatic reset circuit breakers

Should not be used in any circuits

Major adjustments to items such as Regulators, Contactors and Inverters are best done on the bench using procedures in

The Manufacturer's Maintenance Manuals

When using the voltage drop method of checking circuit resistance,

the input voltage must remain constant

What type of antenna is this?

It's NOT an antenna, it's a fuel probe! (Dumb quiz author!)

When checking an autopilot system on the ground, the autopilot should only be engaged:

once the amp warms up and the gyros are at speed

When installing an antenna on an aircraft, it should be attached

so that the loads imposed are transferred to the aircraft structure

The minimum bend radius of coaxial cable should be:

10 times the diameter of the cable

What is the ratio of primary to secondary winding turns in a transformer designed to triple its input?

The secondary with have 3 times as many turns as the primary

When is a US resident NOT rquired to hold an FCC Radiotelephone Operator's Permit?

When flying and communicating within the USA

What is the preferred location of the ELT?

As far aft as possible but forward of the empannage

What is the correct method for installing terminal lugs and splices to wire?

Use a certified crimping tool to secure the connector

A CSD unit drives an AC generator at a constant speed via

A variable hydraulic pump and a hydraulic motor

A Radar Altimeter determines altitude by

transmitting a signal and receiving a reflected signal back

A DME antenna should be installed so it...

is aligned with the centerline of the aircraft

What is the minimum bend raduis for a wire bundle?

10 times the diameter of the bundle

One antenna can be used in light aircraft for the radio range and broadcast bands because the

two ranges are close enough together

An aircraft electrical control relay is

a remotely operated electromagnetic switch

DC Generators operated in parallel have equalizing circuits which

Increase the low output and decrease the high output generator both

Doublers are used with antennas during installation in order to:

reinstate the structural strength of the aircraft skin

Any generator in a 24 volt system showing low voltage probably means:

an out of adjustment voltage regulator

What type of antenna is this?

A VOR antenna for light aircraft

One of the advantages of using AC power in aircraft is:

The greater ease in stepping the voltage up or down

A series DC generator field coil should:

Show low resistance when checked with an ohmeter

Static Dischargers help how?

They prevent radio interference by disssapating static at low current level

The "throw" of a switch (as in: single pole double throw) indicates what?

The circuits each pole can complete through the switch

Reverse current relay contacts which fail to open after generator output has dropped below battery voltage will cause

current to flow in the opposite direction and try to motor the generator

studbud

More Aircraft Electrical & Nav/Comm Systems Review

70 termsStudBud Administration439 plays

Aircraft Electrical Systems and Navigation/Communication/Autopilot Systems review questions; prep for FAA Written Exam

Flashcards70 cardsFPractice quizPHost liveL

Questions 70

Answers

1
When installing an antenna on a vertical fin, what characteristics should be evaluated?
Stiffness and airworthiness
Flutter and vibration
Polarization and impedance
Capacitance and reluctance
2
In modern large aircraft, what device usually monitors flight parameters and performs autopilot functions?
The Performance Computer
Flight Management Computer
The Display Controller
The Transponder
3
Reversing the wires to either the field or the voltage regulator will make a DC motor run in reverse.
True
False
4
What is an important consideration when selecting a fuse or circuit breaker for a particular circuit?
The voltage rating should be lower than the maximum circuit voltage
Current carrying capacity and allowable voltage drop
The capacity of the fuse or CB meets the needs of the circuit
The current exceeds a predetermined value based on the voltage level
5
A connector which may be exposed to moisture should be:
A special moisture proof type
sprayed with varnish
coated with zinc chromate
coated with a water repellent grease
6
The overvoltage control protects the generator system when excessive voltage is present by
interrupting the feedback circuit for the captain's visit to the fwd galley
breaking a circuit feeding the coil of a field control circuit breaker
opening the shunt field circuit
opening and resetting the field control relay
7
Which are the major parts of a DC Motor?
End Frame, Field ass'y, Pole piece, Brush ass'y
Armature ass'y, Field ass'y, Brush ass'y, End Frame
Rheostat, End Frame, Armature ass'y, Pole piece
Commutator, Armature ass'y Field ass'y, End Frame
8
In aircraft electrical systems, automatic reset circuit breakers
Must be used in all essential circuits
Are a good idea as they save pilot workload in emergencies
Are useful only where temporary loads are encountered
Should not be used in any circuits
9
Major adjustments to items such as Regulators, Contactors and Inverters are best done on the bench using procedures in
The Manufacturer's Maintenance Manuals
Aircraft Technical Orders
the FAA Advisory Circular 4313.1A
The "Aircraft Parts Repair for Total Idiots" book
10
What type of antenna is this?
A VOR antenna
A teardrop antenna used for entering holding patterns
A long range HF Communications antenna
An ADF Loop & Sense antenna
11
When using the voltage drop method of checking circuit resistance,
the input voltage must be varied with any load applied
the input voltage must remain constant
the output voltage must remain constant
the output voltage must be varied to compensate for loads
12
What type of antenna is this?
A Communications antenna for high speed aircraft
A DME antenna
An ADF Sense antenna
A smaller VOR antenna for high speed aircraft
13
What type of antenna is this?
An air cooled Emergency Communications antenna
A Transponder antenna without the protective shell
A fluid immersible VOR antenna
It's NOT an antenna, it's a fuel probe! (Dumb quiz author!)
14
The elevator channel of an autopilot controls the aircraft about (around) which axis?
The longitudinal axis
The roll axis
The lateral axis
The yaw axis
15
When checking an autopilot system on the ground, the autopilot should only be engaged:
once the amp warms up and the gyros are at speed
at any time after aircraft power is applied to the system
Never! The autopilot should not be engaged on the ground
whenever the technician so desires
16
What type of antenna is this?
A transponder antenna for light aircraft
A Marker Beacon Antenna
An ADF antenna
A Canted antenna
17
How long must the battery provide power for the locator beacon in the ELT?
24 hours
48 hours
36 hours
72 hours
18
When installing an antenna on an aircraft, it should be attached
with only a single doubler to prevent oil canning of the skin
so that the loads imposed are transferred to the aircraft structure
with a reinforcing doubler on each side of the aircraft skin
to the primary structure at the intersection of all 3 axes
19
A gasket or sealant is used between an antenna and the skin of an aircraft:
on pressurized airframes only
to prevent moisture intrusion
to compensate for the lack of good grounding capability
to prevent abrasion of the skin by the antenna in flight
20
The minimum bend radius of coaxial cable should be:
10 times the diameter of the cable
5 times the diameter of the cable
15 times the diameter of the cable
20 times the diameter of the cable
21
What is the ratio of primary to secondary winding turns in a transformer designed to triple its input?
The primary will have 3 times as many turns as the secondary
The primary will have 6 times as many turns as the secondary
The secondary will have 6 times as many turns as the primary
The secondary with have 3 times as many turns as the primary
22
What does a Rectifier do?
Changes DC to AC
Changes AC to DC
Fixes difficulties between two arguing parties
Uses oscillators to create Alternating Current
23
If an IDG scavange oil filter is contaminated with metal bits, you should:
do an oil analysis to diagnose the problem
spread the bits on a paper towel and see if any have legible part numbers
replace the oil and filter and monitor the filter every 25 flight hours
remove and replace the IDG
24
When is a US resident NOT rquired to hold an FCC Radiotelephone Operator's Permit?
When flying aircraft certified for VFR flights only
When flying and communicating outside the USA
When flying aircraft in EEU countries
When flying and communicating within the USA
25
What is the preferred location of the ELT?
At the lowest point of the fuselage
As far aft as possible but forward of the empannage
As far forward as possible but aft of the radome
Somewhere in the mid-section of the fuselage
26
What is the correct method for installing terminal lugs and splices to wire?
Solder the exposed wire prior to crimping with a tool
Use a certified crimping tool to secure the connector
Crimp using the inside flat surfaces between the handles of any pliers
Solder the terminal or the connector pin/socket to the wire
27
What might this antenna be if it was not a DME antenna?
A Transformer antenna
A Transvestite antenna
A Transceiver antenna
A Transponder antenna
28
A CSD unit drives an AC generator at a constant speed via
A sychronous electric motor
A infinitely variable mechanical gearing system
Pure freaking magic (PFM)
A variable hydraulic pump and a hydraulic motor
29
A Radar Altimeter determines altitude by
receiving signals from ground stations
receiving data transmitted by the ILS System
transmitting a signal and receiving a reflected signal back
interpreting data collected by the transponder
30
The Navigation Lights on some aircraft are controlled by a single wire, on/off switch. This type of switch is called:
DPDT, 3-position switch
SPST, 2-position switch
SPDT, two position switch
VOR, multi-position switch
31
Flashing the Field is the method used to restore generator field residual magnetism.
True
False
32
A DME antenna should be installed so it...
is aligned with the centerline of the aircraft
is aligned with the transponder antenna
is aligned with the glideslope antenna
is aligned with the aircraft chord line but to one side of it
33
What is the minimum bend raduis for a wire bundle?
20 times the diameter of the bundle
10 times the diameter of the bundle
5 times the diameter of the bundle
15 times the diameter of the bundle
34
A fully integrated autopilot controls the aircraft around how many axes?
4
3
2
1
35
One antenna can be used in light aircraft for the radio range and broadcast bands because the
antenna is omni-directional
two ranges are close enough together
antenna length can be electronically adjusted
pilots are clever and can manipulate the frequencies
36
An aircraft electrical control relay is
any conductor which takes electricity and passes it on with no resistance
a remotely operated electromagnetic switch
a device which converts kinetic energy to electrical energy
an electromagnetic reversing mechanism
37
DC Generators operated in parallel have equalizing circuits which
Increase the low output gnerator
Decrease the high output generator
Increase the low output and decrease the high output generator both
Wait for the system to become unstable before doing anything
38
What kind of antenna is this?
An old style transponder antenna
A Loop and Sense antenna
An old style VOR antenna
A Boomerang antenna held up by Thing from the Addams Family
39
Doublers are used with antennas during installation in order to:
eliminate antenna vibration
to increase the validity of the grounding path
prevent oil canning of the skin
reinstate the structural strength of the aircraft skin
40
A Current Limiter is basically a slow-blow fuse and is designed to be used in what?
Low voltage circuits
High current circuits
High voltage circuits
High resistance circuits
41
Any generator in a 24 volt system showing low voltage probably means:
a bad generator
a bad reverse current cutout relay
shorted or grounded wiring
an out of adjustment voltage regulator
42
Installed radio equipment is protected from damage due to jolts and vibration by what?
shock mounts
Foam cushioning between equipment chassis and case
Springs and/or viscous damper mounted racks
Rubber or foam mounts
43
An autopilot changes an attitude in order to correct an error, and controls are streamlined at the end, what happens?
None of these answers are correct
Normal operation
Overshoot and correction
Undershoot and correction
44
What type of antenna is this?
An ADF Sense antenna for older light aircraft
An older style DME antenna for light aircraft
A Marker Beacon antenna for light aircraft
A VOR antenna for light aircraft
45
One of the advantages of using AC power in aircraft is:
There really is no particular advantage; AC generators are just cheaper
AC motors can be reversed but DC motors cannot
Effective voltage is 1.41 times max instantaneous, so less power is used
The greater ease in stepping the voltage up or down
46
Connectors used in aircraft should meet what specifications?
Military Specification (MS)
Society of Electrical Specifications (SES)
Parts Manufacturer Approval (PMA)
Technical Service Order (TSO)
47
A series DC generator field coil should:
Be connected to battery voltage before being checked with an ohmeter
Show low resistance when checked with an ohmeter
Show high resistance when checked with an ohmeter
Be removed from the generator housing before being checked with an ohmeter
48
Static Dischargers help how?
They dissapate static electricity at high current levels
They help prevent radio interference by dissapating static via high voltage
They dissapate static electricity at low voltage levels
They prevent radio interference by disssapating static at low current level
49
The "throw" of a switch (as in: single pole double throw) indicates what?
The terminals by which current can enter or leave the switch
Places at which the the switch will come to rest and open/close a circuit
The circuits each pole can complete through the switch
The number of times a switch must be moved to open a circuit
50
Reverse current relay contacts which fail to open after generator output has dropped below battery voltage will cause
current to flow in the normal direction but at a higher voltage
current to flow in the opposite direction and try to motor the generator
major confusion in the cockpit
current to flow back and forth depending upon battery voltage
51
An ammeter is in a generator lead; the regulator does not limit the maximum current; where can the ammeter be redlined?
50%
(90%
75%
100%
52
What is the preferred location for the VOR antenna on light aircraft?
On top of the cabin with the apex of the "V" pointing forward
On the bottom of the fuselage as far aft as possible
On the bottom of the cabin with the apex of the "V" pointing forward
On the top of the fuselage as far aft as possible
53
Which type of generator is NOT used on aircraft, and why?
Compound wound simply due to expense.
Series wound, because voltage regulation sucks to the max!
Shunt wound because nobody remembers shunt=parallel
Really wound, because these generators easliy get over-excited.
54
The mica between commutator segments must be undercut during generator overhaul by how much?
To the same depth as twice the width of the mica
To the same depth as the width of the mica
To the same depth as half the width of the mica
To the same depth as the co-pilot can think clearly
55
Which of the following is NOT one of the purposes of interpoles in a generator?
Reduce arcing at the brushes
Reduce field strength
Overcome armature reaction
56
The nominal rating of electrical switches refers to continuous
voltage rating with the contacts open
current rating with the contacts closed
current rating with the contacts open
voltage rating with the contacts closed
57
The "G" switch which activates an ELT must do so when force is applied
parallel to the lateral axis of the aircraft
perpendicular to the flight path
parallel to the longitudinal axis of the aircraft
parallel to the vertical axis of the aircraft
58
Tuning a Comm Receiver to the emergency frequency and activating the ELT within 5 minutes past the hour is a valid test.
True
False
59
What in the Wide World of Sports is this thing?
A Wide Area Augmentation System transmitter
A Weather Radar antenna
A lightning detector antenna
A hot plate from the local Chi Chi's restaurant
60
What should be used to protect wires where they pass through a bulkhead?
A suitable grommet
Aerodynamic duct tape
Electrical tape around the wires where they pass through the hole
Teflon spiral wrap and tape
61
Part of the ADF System uses what?
A Marker Beacon antenna
A VOR antenna
A Sense and Loop antenna
A DME antenna
62
What are the colors and locations of the Navigation Lights on aircraft?
Left: white, Right: red, Tail: green
Colored lights are only used on ships.
Left: red, Right: green, Tail: white
Left: pink, Right: pale blue, Tail: yellow
63
Which autopilot channel detects changes in aircraft pitch attitude?
Elevator
Aileron
Rudder
Yaw Damper
64
What type of antenna is this?
A Communications antenna for high speed aircraft
A DME antenna for high speed aircraft
An ADF antenna for high speed aircraft
A VOR antenna for high speed aircraft
65
What component is the sensing device of an electromechanical autopilot?
Servo
Computer
Gyro
Controller
66
Static Inverters are electronic devices that change DC to AC with
with the use of an oscillator
the exclusive properties of an OR gate
the exclusive properties of a NAND gate
with the use of a dynamotor with half wave rectification
67
The positive field lead breaks between a generator and its GCU and shorts out while the engine runs. The output will be:
Normal voltage
Residual voltage
Very high voltage
Zero volts
68
Iron cores of induction coils are laminated to increase core permeability.
True
False
69
The maximum time a circuit can operate and still be considered an intermittent duty circuit is what?
4 minutes
3 minutes
1 minute
2 minutes
70
What is the purpose of a Transponder?
Monitor all flight parameters for the autopilot system
Receive an interrogation signal from the ground and report to ATC
Continually transmit flight data to ATC
Monitor all flight parameters for ATC

More Aircraft Electrical & Nav/Comm Systems Review Flashcards | StudBud