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(Airframe)Aircraft Avionics System > Chapter 12, Sections A > Flashcards

Chapter 12, Sections A Flashcards

1
Q
  1. Two types of fields exist in a radio transmitting antenna to cause it to radiate electrical energy. They are
    A.
    B.
A

An electric field
An magnetic field

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2
Q
  1. The higher the frequency, the _____ (longer or shorter) the wavelength
A

Shorter

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3
Q
  1. The frequency of a radio transmission indicates the number of electromagnetic field ____ that occur in ____ second.
A

Oscillations
One

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4
Q
  1. Each oscillation is called a ____ and frequency is measured in ____ per second or ____
A

Cycle
Cycles
Hertz (Hz)

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5
Q
  1. Radio waves travel at the speed of ____
A

Light

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6
Q
  1. A(n) ____ to wave is necessary to transmit radio waves and antennas are usually ____ to ____ the length of the transmitted wave.
A

Carrier
One-quarter
Onehalf

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7
Q
  1. In order to transmit information, the ____ wave must be altered in some way and this alteration is called ____
A

Carrier
Modulation

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8
Q
  1. There are two ways a radio carrier wave may be modulated, these are:
    A.
    B.
A

Amplitude Modulation (AM)
Frequency Modulation (FM)

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9
Q

9.___ (What type) waves bounce off the ionosphere and can be used to achieve ___-___ radio transmissions.

A

sky, long-range

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10
Q
  1. The three basic functions of every radio transmitter are:
    A.
    B.
    C.
A

a. generate a signal at the correct frequency
b. modulate the carrier wave
c. amplify the signal

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11
Q
  1. The component that generates the carrier wave at the correct frequency is called a(n)
A
  1. oscillator
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12
Q
  1. A component found in both transmitters and receivers whose function is to increase the strength of a signal is called a(n) ____
A
  1. amplifier
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13
Q
  1. The length of a transmitting antenna is determined by the frequency (wavelength) for which the antenna is used. The higher the frequency, the ____ (shorter or longer) the antenna.
A
  1. shorter
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14
Q
  1. A half-wave antenna may also be referred to as (an) ____ antenna.
A

14 Hertz dipole

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15
Q
  1. The metal surrounding the base of a Marconi monopole antenna is called the ____
A
  1. ground plane
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16
Q
  1. Aircraft VHF communications antennas are ____ (horizontally or vertically) polarized.
A
  1. vertically
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17
Q
  1. A(n) ____circuit is used to isolate the desired frequency from all the frequencies intercepted by an antenna.
A
  1. tuning
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18
Q
  1. High Frequency (HF) radios are most commonly used by large aircraft for ____ (general, oceanic or continental) Air Traffic Control communications.
A
  1. oceanic
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19
Q
  1. Most civilian aviation radio communication is done in the ___ (UHF or VHF)
    frequency range.
A
  1. VHF
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20
Q
  1. VHF communications and navigation equipment ____ (is or is not) limited to an operating distance equivalent to the line of sight distance.
A
  1. is
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21
Q
  1. SATCOM radios operate in the ____ (VHF or UHF) frequency range and can carry both
    And ____ communications.
A
  1. UHF, voice, data
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22
Q
  1. A special VHF/HF communications system for calling a single, specific air carrier aircraft is known as ____
A
  1. SELCAL
23
Q
  1. ACARS is a system for transmitting routine operational, maintenance and administrative messages to airliners via a ____
A
  1. digital data link
24
Q
  1. ADF refers to the ___ (airborne or ground) equipment and NDB refers to the associated ___ (airborne or ground) equipment.
A
  1. airborne, ground
25
Q
  1. ADF operates in the ___ [LF/MF or VHF/UHF) frequency range
A
  1. LF/MF
26
Q
  1. The two antennas required for the operation of an ADF are:
    A.
    B.
A
  1. a. loop
    b. sense
27
Q
  1. VOR operates in the ___ (VHF or UHF) frequency range.
A
  1. VHF
28
Q
  1. VOR is a ___ (phase or voltage) comparison system.
A
  1. phase
29
Q
  1. VOR navigation radios used for IFR operations must be checked for accuracy every ___ days
A

30

30
Q
  1. Distance measuring equipment ___ (is or is not) a form of pulse equipment.
A
  1. is
31
Q
  1. The principal advantage of an area navigation system is that it allows a pilot to fly ___
A
  1. direct to a destination
32
Q
  1. An RNAV must be tuned to a ___ (VOR or VORTAC) station to operate properly.
A
  1. VORTAC
33
Q
  1. Inertial navigation systems ___ (do or do not) require an external radio signal.
A
  1. do not
34
Q
  1. INS systems operate by very accurate measurement of ___ forces.
A
  1. acceleration
35
Q
  1. GPS is a ___ (ground or space)-based navigation system.
A
  1. space
36
Q
  1. In order to determine an aircraft’s position and altitude, the GPS system must receive a minimum of ___ signals.
A

four

37
Q
  1. It is possible for a pilot to respond with any of ___ [how many) codes on a mode
    A/3 radar beacon transponder.
A

4096

38
Q
  1. Altitude information is transmitted froni a radar bouen transponder when it is operating in Mode ____ (A or C)
A
  1. C
39
Q
  1. If two aircraft with operational Mode S transponders and ___ systems are on a collision course the systems communicate with each other and present each pilot with guidance to ____
A
  1. TCAS, resolve the potential conflict
40
Q
  1. Transponders must be tested and inspected every ___ calendar months.
A

24

41
Q
  1. The four ground-based components of the ILS are:
    A.
    B.
    C.
    D.
A
  1. a. localizer
    b. glideslope
    c. marker beacons
    d. approach and runway
    lighting
42
Q
  1. The glide-slope transmitter operates in the ___ (VHF or UHF) frequency range.
A

UHF

43
Q
  1. Tuning to the desired localizer frequency automatically tunes the ____ (marker beacon or glide slope) receiver to the proper frequency.
A
  1. glideslope
44
Q
  1. A marker beacon uses a single-frequency transmitter with (an) ____ carrier frequency.
A
  1. 75MHz
45
Q
  1. The amber light on the marker beacon receiver will light up when the aircraft passes over the ___ (outer or middle) marker.
A
  1. middle
46
Q
  1. An emergency locator transmitter is designed to transmit for ___ hours and operates on ___ MHz and ___MHz
A

48, 121.5, 243.0

47
Q
  1. Cockpit Voice Recorders and Flight Data Recorders are normally installed in the ___
    (forward or aft) fuselage area
A

aft

48
Q
  1. Basic weather radar signals are reflected only by the ___ (clouds or rain) inside the storm.
A

rain

49
Q
  1. Fill in the color that is used on a color weather radar to indicate the intensity of the rainfall:
    a. Least severe
    b. Medium severity
    c. Most severe
A
  1. a. green
    b. yellow
    c. red
50
Q
  1. ___ (X-hand or C-band) radar is more common in general aviation airplanes.
A

X-band

51
Q
  1. ___ (X-band or C-band) radar is better for penetrating known areas of precipitation.
A

C-band

52
Q
  1. A Stormscope detects the radio waves emitted by ___
A

Lightning discharges

53
Q
  1. A major disadvantage of TCAS systems is that they cannot detect aircraft that do not have operating ___.
A

Transponders

(Airframe)Aircraft Avionics System (12 decks)

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