Radar

Question 1

Hvað segir Pulse Recurrence Rate (PRR) þér?

Answer 1

Number of pulses per second

Question 2

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

Answer 2

lower, larger

Question 3

Hver er formúlan fyrir range (Primary radar)?

Answer 3

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

Question 4

Primary radar operates on the __ technique

Answer 4

pulse

Question 5

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

Answer 5

b) Beam width

Question 6

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

Answer 6

measurable range.

Question 7

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

a) maximum range
b) minimum range

Answer 7

b) minimum range

Question 8

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

Answer 8

b) The number of pulses transmitted per second

Question 9

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

Answer 9

c) 16

Question 10

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

Answer 10

Pulse Repetition Frequency (PRF)

Question 11

Airborne Weather Radar (AWR) uses ___ radar principles.

Answer 11

primary

Question 12

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

a) Pulse repetition rate
b) Pulse length

Answer 12

b) Pulse length

Question 13

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

Answer 13

allt

Question 14

Moving target indicator eliminates all ___ targets.

Answer 14

stationary

Question 15

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

Answer 15

200 - 300 NM

Question 16

Moving target indicator suppresses all ___ echoes

Answer 16

stationary

Question 17

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

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

Answer 17

a) a long wavelength

Question 18

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

Answer 18

position

Question 19

A typical primary pulse radar uses a ___ aerial for

a) Transmission
b) both transmission and reception

Answer 19

directional

Question 20

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

Answer 20

eliminates such echoes.

Question 21

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

Answer 21

PSR (Primary Surveillance Radar)

Question 22

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

Answer 22

short pulse length and narrow beam

Question 23

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

Answer 23

80

Question 24

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

Answer 24

SHF, moisture

Question 25

Surface movement radar rotates _ times per minute.

Answer 25

60

Question 26

Hvaða radar er það sem getur stundum greint flugvélategundir?

Answer 26

Surface Movement Radar

Question 27

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

Answer 27

Continuous wave eliminates the minimum target reception range

Question 28

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

Answer 28

Primary

Question 29

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

Answer 29

PWS (Predictive Windshear System)

Question 30

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

Answer 30

functioning

Question 31

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

Answer 31

clouds

Question 32

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

Answer 32

10

Question 33

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

Answer 33

MAPPING

Question 34

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

Answer 34

b) colour zones being closer together

Question 35

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

Answer 35

primary, SHF

Question 36

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

Answer 36

echo, radar

Question 37

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

Answer 37

functioning

Question 38

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

Answer 38

b) Ground/terrain will be indicated

Question 39

AWR uses a 3 cm wavelength to detect larger ___.

Answer 39

water droplets

Question 40

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

Answer 40

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

Question 41

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.

Answer 41

echos, idependent

Question 42

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

Answer 42

larger

Question 43

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

Answer 43

lower

Question 44

Hvort er meira accurate in bearing and distance? a) Primary radar b) Secondary radar (SSR)

Answer 44

a) Primary radar

Question 45

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

Answer 45

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.

Question 46

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.

Answer 46

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

Question 47

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

Answer 47

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

Question 48

The maximum range of primary radar depends on a) Pulse repetition frequency b) pulse length

Answer 48

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.

Question 49

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?

Answer 49

power output í fjórða veldi

Question 50

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

Answer 50

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.

Question 51

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

Answer 51

b) number of pulses per second

Question 52

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

Answer 52

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

Question 53

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

Answer 53

a) beam width | descrimination in azimuth er að greina á milli hluta í hvaða stefnu þeir eru.

Question 54

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

Answer 54

short pulse length, narrow beam