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RNAV > Radar > Flashcards

Radar Flashcards

1
Q

Hvað segir Pulse Recurrence Rate (PRR) þér?

A

Number of pulses per second

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2
Q

When an operator increases range, PRF becomes __ and pulse length becomes __.

A

lower, larger

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3
Q

Hver er formúlan fyrir range (Primary radar)?

A

range (km) = 300,000 / PRF*2

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4
Q

Primary radar operates on the __ technique

A

pulse

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5
Q

In a primary radar using the pulse technique, the ability to discriminate between targets in azimuth is a factor of

a) Pulse Recurrence Rate (PRR)
b) Beam width
c) Pulse length

A

b) Beam width

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6
Q

In a primary radar using pulse technique pulse length determines minimum ___ ___.

A

measurable range.

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7
Q

In a primary radar using pulse technique, PW (Pulse Width or also called Pulse Length) determines

a) maximum range
b) minimum range

A

b) minimum range

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8
Q

In relation to primary radar, what does the term pulse recurrence frequency signify?

a) The time between each transmission of pulses
b) The number of pulses transmitted per second

A

b) The number of pulses transmitted per second

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9
Q

For any given circumstances, in order to double the effective range of a primary radar, the power output must be increased by a factor of:
a) 8 b) 4 c) 16 d) 2

A

c) 16

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10
Q

The theoretical maximum range for an Airborne Weather Radar is determined by the __ ___ frequency

A

Pulse Repetition Frequency (PRF)

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11
Q

Airborne Weather Radar (AWR) uses ___ radar principles.

A

primary

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12
Q

The main factor which determines the minimum range that can be measured by a pulsed radar is

a) Pulse repetition rate
b) Pulse length

A

b) Pulse length

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13
Q

Hvað af þessu notar pulse technique (radar)?

a) Aerodrome surface movement radar
b) Airborne weather radar
c) Secondary surveillance radar (SSR)
d) Aerodrome Surveillance (approach) radar

A

allt

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14
Q

Moving target indicator eliminates all ___ targets.

A

stationary

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15
Q

What is the max range of an ATC Long Range Surveillance Radar?

A

200 - 300 NM

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16
Q

Moving target indicator suppresses all ___ echoes

A

stationary

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17
Q

In order to penetrate a cloud, a primary radar signal must have

a) a long wavelength
b) High PRF
c) short pulse

A

a) a long wavelength

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18
Q

Information displayed on a primary radar system is aircraft ___ only.

A

position

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19
Q

A typical primary pulse radar uses a ___ aerial for

a) Transmission
b) both transmission and reception

A

directional

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20
Q

Echoes that do not change in distance from antenna (relative speed zero) are dangerous because Moving Target Indicator (MTI)…

A

eliminates such echoes.

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21
Q

Hvaða græja er notuð til að detecta aircraft not equipped with transponder?

A

PSR (Primary Surveillance Radar)

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22
Q

What combination gives the best screen picture in primary search radar? Long/short pulse length and narrow/wide beam

A

short pulse length and narrow beam

23
Q

In a Terminal Area Surveillance radar, the range is up to __ NM

A

80

24
Q

Surface movement radar uses __ band instead of EHF because EHF is absorbed and scattered by __ in the air.

A

SHF, moisture

25
Q

Surface movement radar rotates _ times per minute.

A

60

26
Q

Hvaða radar er það sem getur stundum greint flugvélategundir?

A

Surface Movement Radar

27
Q

Hver er kosturinn við primary radar of a continuous wave transmission as compared with pulse transmissions?

A

Continuous wave eliminates the minimum target reception range

28
Q

Which radar system is most used for short range operation? ___ continuous wave

A

Primary

29
Q

You are on the runway, there is a thunderstorm in front of you. __ should be off.

A

PWS (Predictive Windshear System)

30
Q

Height ring: Can be used to determine that the weather radar is __.

A

functioning

31
Q

During a climb, the tilt needs to be decreased to scan for hazardous ___.

A

clouds

32
Q

Optimum frequency is __ GHz because the larger water droplets will give good echoes and the antenna can be kept relatively small

A

10

33
Q

The aircraft weather radar uses a cosecant radiation pattern uses what mode?

A

MAPPING

34
Q

Airborne Weather Radar that has a colour cathode ray tube (CRT), the areas of greatest turbulence are indicated on the screen by

a) large areas of flashing red colour
b) colour zones being closer together

A

b) colour zones being closer together

35
Q

Airborne Weather Radar uses a secondary/primary radar in the VHF/SHF band.

A

primary, SHF

36
Q

Height ring is an ___ which is produced by side lobes from the aerial of a weather ___.

A

echo, radar

37
Q

A pilot can use the height ring to determine if the weather radar is ___.

A

functioning

38
Q

Hvað á við um MAP mode í AWR?

a) A chart/map from the navigation database will be indicated
b) Ground/terrain will be indicated

A

b) Ground/terrain will be indicated

39
Q

AWR uses a 3 cm wavelength to detect larger ___.

A

water droplets

40
Q

Hverju getur þú lent í ef þú notar MAP mode í polar areas?

A

Mistake the edge of coastal ice off shore for the real coastline

41
Q

In weather radar the use of cosecant beam in mapping mode enables scanning of a large ground zone producing __ who’s signals are practically ___ of distance.

A

echos, idependent

42
Q

Airborn weather radars use a frequency of approximately 9 GHz because the wavelength is such that reflections are obtained only from the ___ water droplets.

A

larger

43
Q

To improve the detection of precipitation areas in e.g. thunderstorms, in which the top of the cloud lies at or slightly above the level of flight:
the tilt setting should be higher/lower when the aircraft climbs to a higher altitude

A

lower

44
Q

Hvort er meira accurate in bearing and distance?

a) Primary radar
b) Secondary radar (SSR)

A

a) Primary radar

45
Q

In the SSR response, the operation of the transponder ident button

a) sends a special pulse after the normal response pulse train
b) sends a special pulse before the normal response pulse train

A

a) sends a special pulse after the normal response pulse train
Getur hugsað þetta þannig að mikilvægast sé að koma upplýsingunum um staðsetningu og svo auka upplýsingum bætt við aftan á.

46
Q

With mode-S each aircraft can be uniquely interrogated and identified by using

a) Special Position Identification (SPI) pulse
b) 24 bits address code, giving more than 16 million possible codes.

A

b) 24 bits address code, giving more than 16 million possible codes.

47
Q

The two main design functions of Secondary Surveillance Radar (SSR) Mode S are:

a) Air to ground and ground to air data link communications and improved ATC aircraft surveillance capability
b) Collision avoidance using TCAS II and improved long range (HF) communication capability

A

a) Air to ground and ground to air data link communications and improved ATC aircraft surveillance capability

48
Q

The maximum range of primary radar depends on

a) Pulse repetition frequency
b) pulse length

A

a) Pulse repetition frequency
Ímyndaðu þér bara að til að fá meira range þá er sett bara á fast-motion, stutt skot eins og úr hríðskotabyssu.
ATH þetta er maximum range, minimum range ræðst af pulse length.

49
Q

Hvaða formúlu notar þú til að átta þig á hvað þú þarft að auka power output mikið til að fá t.d. tvöföldun á range?

A

power output í fjórða veldi

50
Q

When an operator increases the range on a radar-display, in general

a) The PRF becomes lower and the pulse length larger
b) The PRF becomes higher and the pulse length smaller

A

a) The PRF becomes lower and the pulse length larger
Ímyndaðu þér bra að þegar range er increased þá er hægt á pölsinu, frequency lower og lengri lengdir. Ímyndaðu þér bara að radarinn fari á slow motion.

51
Q

In relation to radar systems that use pulse technology, the term Pulse Recurrence Rate (PRR) signifies the

a) number of cycles per second
b) number of pulses per second

A

b) number of pulses per second

52
Q

Ef þú ert spurður um hvaða radar equipments noti “pulse technique” hvað er svarið?

A

held að allir radars noti pulse technique, svo þú myndir velja alla svarmöguleika sem innihalda orðið “radar”.

53
Q

In a primary radar using pulse technique, he ability to discriminate between targets in azimuth is a factor of

a) beam width
b) aerial rotation rate

A

a) beam width

descrimination in azimuth er að greina á milli hluta í hvaða stefnu þeir eru.

54
Q

Best results in radar: Short/long pulse length and wide/narrow beam

A

short pulse length, narrow beam

RNAV (8 decks)

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