Snow and clear air turbulence.

 

Вопрос 230

What is the maximum theoretical unambiguous range for a primary radar with a PRF of 650 pps?

 

 

Ответы

1                   

124 km

 

2                   

134 km

 

3              

Km

 

4                   

67 NM

 

 

Вопрос 231

Airborne weather radars are generally based on the use of:

 

 

Ответы

1              

Primary radar in the SHF band.

 

2                   

secondary radar in the SHF band.

 

3                   

secondary radar in the VHF band.

 

4                   

primary radar in the UHF band.

 

Вопрос 232

The range of a primary radar, using the pulse technique, is affected by:

 

 

Ответы

1                   

pulse width.

 

2                   

transmission frequency.

 

3                   

PRF.

 

4              

All of the above.

 

Вопрос 233

To improve the detection of precipitation area(s) in e.g. thunderstorms, in which the top of the cloud lies at or

 

slightly above the level of flight:

 

 

Ответы

1                   

the tilt setting should be higher when the aircraft climbs to a higher altitude.

 

2                   

the tilt setting should be lower when the selected range increases.

 

3                   

the tilt setting should be higher when the selected range decreases.

 

4              

The tilt setting should be lower when the aircraft climbs to a higher altitude.

 

Вопрос 234

In an Airborne Weather Radar that has a colour cathode ray tube (CRT) the areas of greatest turbulence are

 

indicated on the screen by:

 

 

Ответы

1              

Colour zones being closest together.

 

2                   

iso-echo areas which are coloured black.

 

3                   

large areas of flashing red colour.

 

4                   

blank iso-echo areas where there is no colour.

 

Вопрос 235

Ignoring pulse length, the maximum pulse repetition frequency (PRF) that can be used by a primary radar

 

facility to detect targets unambiguously to a range of 200 NM is: (pps - pulses per second)

 

 

Ответы

1                   

308 pps

 

2                   

375 pps

 

3              

Pps

 

4                   

782 pps

 

 

Вопрос 236

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

 

 

Ответы

1              

Air to ground and ground to air data link communications and improved АТС aircraft surveillance capability.

 

2                   

continuous automatic position reporting using Global Positioning System (GPS) satellites and collision avoidance using TCAS II.

 

3                   

collision avoidance using TCAS II and improved long range (HF) communication capability.

 

4                   

the elimination of ground to air communications and the introduction of automatic separation between aircraft using TCAS II.

 

 

Вопрос 237

What is the maximum theoretical unambiguous range for a primary radar with a PRF of 500 pps?

 

 

Ответы

1                   

250 km

 

2                   

150 km

 

3              

Km

 

4                   

200 km

 

Вопрос 238

Echoes that do not change in distance from the antenna of a ground radar with a Moving

 

Target Indicator are dangerous for the following reason:

 

 

Ответы

1                   

The frequency of the transmitted radar signals changes too much by the Doppler effect.

 

2                   

The MTI does not recognise this as a moving object due to the blind speed.

 

3                   

The radar is not able to display two echoes moving in the same direction.

 

4              

The moving target indicator (MTI) eliminates such echoes.

 

Вопрос 239

"Fruiting" is caused by:

 

 

Ответы

1                   

aeroplane in close proximity responding to the same interrogation.

 

2                   

doppler effect on targets moving radially towards or away from the АТС radar station.

 

3              

Aeroplane at range responding to interrogations from another АТС radar station.

 

4                   

an aeroplane's transponder responding to side lobes or reflections of the interrogation signal.

 

 

Вопрос 240

A frequency of 10 GHz is considered to be the optimum for use in an airborne weather radar system because:

 

 

Ответы

1                   

less power output is required in the mapping mode.

 

2                   

static interference is minimised.

 

3              

The larger water droplets will give good echoes and the antenna can be kept relatively small.

 

4                   

greater detail can be obtained at the more distant ranges of the smaller water droplets.

 

Вопрос 241

Which of the following cloud types is most readily detected by airborne weather radar?

 

 

Ответы

1              

Cumulus

 

2                   

Stratus

 

3                   

Cirrocumulus

 

4                   

Altostratus

 

Вопрос 242

When using the airborne weather radar equipment on the ground before take-off:

 

 

Ответы

1                   

the contrast control should be adjusted to maximum contrast.

 

2              

The radar transmitter should not be operated when personnel is observed in the sector ahead of the aircraft.

 

3                   

the antenna tilt control should be set to max negative tilt.

 

4                   

the gain control should be adjusted according to the flight conditions expected when airborne.

 

 

Вопрос 243

The selection of code 2000 on an aircraft SSR transponder indicates:

 

 

Ответы

1                   

an emergency.

 

2                   

transponder malfunction.

 

3