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AT1 > Aviation Systems & SE (2018) > Flashcards

Aviation Systems & SE (2018) Flashcards

1
Q

The A-scope’s positive gate pulse goes to the control grid of the CRT, causing the electron beam to________

A

display the output of the video mixer.

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2
Q

What type of display works best under conditions where the antenna scans a sector of less than 180 degrees?

A

B-scan.

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3
Q

The PPI scope provides what type of presentation?

A

a radial sweep line, manlike picture

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4
Q

List the factors that affect the maximum range of pulse radars.

A

transmitted power
PRF
receiver sensitivity

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5
Q

What are the characteristics of radar?

A

rage
azimuth
resolution
accuracy

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6
Q

Define azimuth resolution.

A

the ability to separate targets at the same range but on different bearings

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7
Q

Why does a long pulse width increase or decrease the range capabilities of a radar?

A

because of the greater amount of RF energy sent out in each pulse.

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8
Q

List the units in an IFF that make up the challenging station.

A

interrogator
synchronizer
radar

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9
Q

A point that is defined by stated or implied coordinates is known as a

A

position

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10
Q

The intended horizontal direction of travel is known as

A

course

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11
Q

In what two reference directions can you express bearings?

A

True north or the direction the aircraft is pointing.

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12
Q

The east/west geographical coordinate is known as

A

longitude

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13
Q

You measure longitude 180° east or west from what point?

A

Prime Meridian, 0 degree in Greenwich, England.

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14
Q

The angle between true north and the direction of the earth’s magnetic field is known as

A

variation

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15
Q

How do you label variation?

A

east or west as the magnetic field direction is east or west, respectively, of true north.

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16
Q

Magnetic influences cause what type of error in magnetic compasses?

A

deviation

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17
Q

The net result of both variation and deviation is known as

A

compass error

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18
Q

You can determine a position from the record of a previously known position, course, speed, and time traveled by what process?

A

dead reckoning

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19
Q

What navigation system makes use of the physical laws of motion that Newton

A

inertial navigation

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20
Q

Describe navigation.

A

Air navigation is the process of determining the geographical position and maintaining the desired direction of an aircraft relative to the earth’s surface.

21
Q

Describe differentiation

A

Differentiation is the process of investigating or comparing ho w one physical property varies with respect to another.

22
Q

Define a self-contained navigation system

A

A self-contained system is complete in itself; it does not depend on the transmission of data from ground installations.

23
Q

State the transmission principle of the VOR

A

The VOR transmission principle is based on creating a phase difference between two signals.

24
Q

What is the frequency range of the transmitted airborne TACAN DME

A

1025 MHz to 1150 MHz

25
Q

With the addition of X and Y modes to the TACAN system, what total number of
channels are available?

A

126 channels in X and 126 channels in Y, 252 total channels available.

26
Q

Loran determines the difference by measuring time intervals between the arrival of the first signal and the arrival of a second signal. What type of measurements can be used?

A

CRT display, automatically by the loran set, integrating with the computer.

27
Q

State the basic reason for incorporating the navigational computer in aircraft.

A

To handle the many flight conditions at the speed of sound or above.

28
Q

List the data-gathering units of a typical navigational computer system.

A 
Radar
Doppler
INS
loran
TACAN.
29
Q

What other uses can the sophisticated computer system provide?

A

Solving of ballistic problems, automatic release of bombs and missiles, cargo drops, and notification of bailout times are just a few.

30
Q

What two transmission bands are contained within the line-of-sight transmission band?

A

UHF and VHF.

31
Q

What is meant by the statement “some VHF transceivers are dual purpose?”

A

Their receivers also work with VHF and VOR.

32
Q

What type of communications antenna is excellent for higher frequencies?

A

The biconical or disc horn

33
Q

What term is given to electronic ECM equipment designed to jam communica- tions, navigation, and radar receivers?

A

Active ECM.

34
Q

Describe ballistics.

A

The science of motion of projectiles.

35
Q

Define trajectory.

A

The curve of a projectile describes in space as it travels to the target.

36
Q

What two factors determine the maximum detection range of a submarine?

A

Its magnetic anomaly and the sensitivity of the detector.

37
Q

What is the purpose of compensation

A

To provide a magnetically clean environment and ensure the detecting system will not be limited by the aircraft itself.

38
Q

What recorder system plots the frequency of the sound waves against the intensity of their acoustic energy and duration of the sound emission from an omnidirectional passive sonobuoy?

A

LOFAR

DIFAR

39
Q

List the types of sonobuoys.

A 
Passive
active
CASS 
DICASS
special purpose
40
Q

List the four basic modes of the DIFAR system.

A

Omnisearch
ALI-LOFAR
DIFAR
range

41
Q

What is the purpose of external power?

A

Starting aircraft engines and/or ground servicing and maintenance.

42
Q

List some power conversion devices

A

Transformer-rectifier, inverter, and frequency changer.

43
Q

What components protect an aircraft electrical system?

A

Fuses
current limiters
circuit breakers.

44
Q

At what potential should a fuse be operated? For what reason?

A

At about 75 percent of its rated value, it provides a good balance between protection and reliability.

45
Q

What advantage does a circuit breaker have have over a fuse?

A

They can be reset and used again.

46
Q

List the three basic types of circuit breakers.

A

Thermal
magnetic
thermomagnetic.

47
Q

MEPP refers to what types of units? How are these units powered?

A

Portable units not installed aboard aircraft; they are powered by either diesel fuel, jet fuel, gasoline, or electricity.

48
Q

What MEPPs identification would indicate dc output power, as output power, and ac/dc output power, respectively?

A

NA, NB, and NC

49
Q

What is the difference between an MEPP and an MMG?

A

MMGs are not self-contained and require an external electrical power source for operation.

AT1 (31 decks)

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