062.03 RADAR

Question 1

In a primary radar using pulse technique, pulse length determines the (minimum/maximum) ​measurable range.

Answer 1

In a primary radar using pulse technique, pulse length determines the (minimum) measurable range.

Question 2

If a mode A/C transponder receives a P2 pulse from which the amplitude is larger than that of the P1 and P3 pulse, the transponder is located in the direction of (the main lobe/one of the side lobes)​ of the interrogator antenna.

Answer 2

If a mode A/C transponder receives a P2 pulse from which the amplitude is larger than that of the P1 and P3 pulse, the transponder is located in the direction of (one of the side lobes) of the interrogator antenna.

- The transponder response will be suppresed for a short time interval (Side Lobe Suppression) -

Question 3

The difference between A/C all call and A/C/S all call is the (amplitude/duration/presence) of P4 pulse.

Answer 3

The difference between A/C all call and A/C/S all call is the (duration) of P4 pulse.

Question 4

In the SSR response, the operation of the transponder ident button sends a special pulse (before/after)​ the normal response pulse train.

Answer 4

In the SSR response, the operation of the transponder ident button sends a special pulse (after) the normal response pulse train.

Question 5

(Short/Long) pulse lenght and a (wide/narrow) beam give the best screen picture in a primary search radar.

Answer 5

(Short) pulse lenght and a (narrow) beam give the best screen picture in a primary search radar.

Question 6

When an operator increases the range on a radar display, in general the PRF becomes (higher/lower) and the pulse length (smaller/larger)​.

Answer 6

When an operator increases the range on a radar display, in general the PRF becomes (lower) and the pulse length (larger).

Question 7

When the AWR is operating in weather (WX) mode, the (3-5/85)° (Pencil/Fan-shaped)​ beam is used.

Answer 7

When the AWR is operating in weather (WX) mode, the (3-5)° (Pencil) beam is used.

Question 8

Aircraft entering airspace from an area where SSR operation has not been required should use SSR code (…)​.

Answer 8

Aircraft entering airspace from an area where SSR operation has not been required should use SSR code (2000).

Question 9

The ATC transponder system, excluding Mode S, contains (two/four) modes, each of (1024/4096) ​codes.

Answer 9

The ATC transponder system, excluding Mode S, contains (two) modes, each of (4096) codes.

Question 10

The allocation of the 24-bit aircraft address used for Mode S transponders states that (civil/military/every) aircaft will have been allocated with a(n) (NATO/ICAO)​ Aircraft Address which is hard coded into the airframe.

Answer 10

The allocation of the 24-bit aircraft address used for Mode S transponders states that (every) aircaft will have been allocated with a(n) (ICAO) Aircraft Address which is hard coded into the airframe.

Question 11

In Mode C, indicated pressure altitude is presented in increments of (…) ​ft.

Answer 11

In Mode C, indicated pressure altitude is presented in increments of (100) ft.

Question 12

On the AWR display, the moste severe turbulence will be shown by (…)​.

Answer 12

On the AWR display, the moste severe turbulence will be shown by (a steep colour gradient).

Question 13

In a primary radar using pulse technique, the ability to discriminate between targets in azimuth is a factor of (pulse lenght/PRF/beam width/aerial rotation rate)​.

Answer 13

In a primary radar using pulse technique, the ability to discriminate between targets in azimuth is a factor of (beam width).

Question 14

In a primary radar using pulse technique, Pulse Recurrence Frequency (PRF) determines the (minimum/maximum) ​measurable range.

Answer 14

In a primary radar using pulse technique, Pulse Recurrence Frequency (PRF) determines the (maximum) measurable range.

Question 15

Which SSR mode is used is determined by (…).

Answer 15

Which SSR mode is used is determined by (the time interval between the pulses P1 and P3)​.

Question 16

A mode S transponder receives among other pulses a short P4 pulse from an interrogater. This means that the interrogator transmits a Mode (A/C/S / A/C only) all call.

Answer 16

A mode S transponder receives among other pulses a short P4 pulse from an interrogater. This means that the interrogator transmits a Mode (A/C only) all call.

Question 17

A mode S transponder receives among other pulses a long P4 pulse from an interrogater. This means that the interrogator transmits a Mode (A/C/S / A/C) all call.

Answer 17

A mode S transponder receives among other pulses a long P4 pulse from an interrogater. This means that the interrogator transmits a Mode (A/C/S) all call.

Question 18

Describe PRI

Answer 18

(Pulse Recurrence Interval) The time interval between the start of transmission of succesive pulses, given in microseconds. PRI = 1 ÷ PRF

Question 19

Gain control in an AWR changes the (…)​.

Answer 19

Gain control in an AWR changes the (sensitivity of the receiver). Increasing gain will result in lower intensity areas being shown.

Question 20

If a mode A/C transponder receives a P2 pulse from which the amplitude is smaller than that of the P1 and P3 pulse, the transponder is located in the direction of (the main lobe/one of the side lobes)​ of the interrogator antenna.

Answer 20

If a mode A/C transponder receives a P2 pulse from which the amplitude is smaller than that of the P1 and P3 pulse, the transponder is located in the direction of (the main lobe) of the interrogator antenna.

Question 21

Describe pulsewidth

Answer 21

(Also; pulse length) The duration of the pulse, generally given in microseconds.

Question 22

Airborne weather radar systems use a wavelength of approximately (…)​ cm.

Answer 22

Airborne weather radar systems use a wavelength of approximately (3) cm.

Question 23

Fruiting is caused by aeroplane (…).

Answer 23

Fruiting is caused by aeroplane (at range responding to interrogations from another ATC radar station)​.

Question 24

The typical range for a Terminal Area surveillance radar (TAR) is up to (25/80/250)​ NM.

Answer 24

The typical range for a Terminal Area surveillance radar (TAR) is up to (80) NM.

Question 25

All aircraft transponder responses are transmitted at a frequency of (…)​ MHz.

Answer 25

All aircraft transponder responses are transmitted at a frequency of (1090) MHz.

Question 26

The autotilt function in the AWR adjusts its tilt according to the (bank angle/altitude/attitude)​.

Answer 26

The autotilt function in the AWR adjusts its tilt according to the (altitude).

Question 27

In order to double the effective range of a primary radar, the power output must be increased by a factor of (…)​.

Answer 27

In order to double the effective range of a primary radar, the power output must be increased by a factor of (16).

Question 28

The frequency of an SSR ground transmission is (…) ​MHz.

Answer 28

The frequency of an SSR ground transmission (interrogations) is (1030) MHz.

Question 29

Airborne Weather Radars are generally based on (primary/secondary) radar in the (…) ​band.

Answer 29

Airborne Weather Radars are generally based on (primary) radar in the (SHF) band. (9.375 GHz)

Question 30

The maximum range obtainable from an ATC Long Range Surveillance Radar is approximately (50-100/100-200/200-300/300-400) ​NM.

Answer 30

The maximum range obtainable from an ATC Long Range Surveillance Radar is approximately (200-300) NM.

Question 31

Garbling in Mode A and C may occur when two or more aircraft are in (different/approximately the same) direction(s) from the interrogator with a difference in slant range of (more/less) than 1.7 NM.

Answer 31

Garbling in Mode A and C may occur when two or more aircraft are in (approximately the same) direction(s) from the interrogator with a difference in slant range of (less) than 1.7 NM.

Question 32

Describe PRF

Answer 32

(Pulse Recurrence Frequency or PRR: Pulse Recurrence Rate) The number of pulses transmitted in a second (pps).