GROUND RADAR – Air – DGCA Question Bank For Politics

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#1. Which is the typical range of a Terminal area Surveillance Radar (TAR)?

Up to 25 nm.

Up to 80 nm.

Up to 250 nm.

Up to 2500 nm.

#2. PAR at a military airfield has both an azimuth and an elevation element. It must be able to provide accuracy within?

+/-20 feet elevation and azimuth.

+/-30 feet elevation and azimuth.

+/-30 feet elevation and +/-20 feet azimuth.

+/-20 feet elevation and +/-30 feet azimuth.

#3. What is a typical range for an Enroute Surveillance Radar (RSR)?

Up to 25 nm.

Up to 80 nm.

Up to 250 nm.

Up to 2500 nm.

#4. In which frequency band do most Airfield Surface Movement radar systems operate?

VHF.

UHF.

SHF.

EHF.

#5. A radar used by ATC has the following characteristics. Long wavelength and aerial rotation rate of 5 RPM. It is most likely to be?

Airfield surface movement radar.

Precision approach radar.

Enroute surveillance radar.

Terminal surveillance radar.

#6. During a surveillance radar approach, the vertical position of the aeroplane, unless advised otherwise, is given in terms of?

Height above aerodrome QNH level.

Height above aerodrome level.

Height above QNH datum.

Height above QNH threshold.

#7. An Aerodrome Ground Movements Radar is likely to operate in the __ band with a scan rate of revolutions per minute.

UHF 20.

SHF 60.

EHF 20.

EHF 1000.

#8. Why does surface movement radar use a frequency in the SHF band and not EHF?

EHF is potentially hazardous to personnel in the area. This was completely overcome by switching to SHF.

The power requireents of EHF were unsustainable in Europe.

SHF gives better definition of aircraft type than EHF.

EHF is absorbed and scattered by moisture in the air. Switching so SHF band because?

#9. Surface movement radars operate mainly in the SHF band as opposed to the EHF band because?

EHF is more expensive.

EHF is likely to detect more moisture in the atmosphere.

The EHF band not provide sufficient frequency spacing.

EHF radiated power is more dangerous to users health.

#10. A moving target indicator (MTI)?

Rejects all stationary targets.

Rejects all moving targets.

Is only effective if the target moves directly towards the ground unit.

Is not effective if the target moves directly towards the ground unit.

#11. Short range aerodrome radars will have _____ wavelengths?

Millimetric.

Centimetric.

Decimetric.

Metric.

#12. Two types of radar approach may be available?

Surveillance approach and final approach.

Final approach and precision approach.

Terminal approach and surveillance approach.

Surveillance approach and precision approach.

#13. Precision Approach radars (PAR) are required under the ICAO specification to indicate an aircraft within the following parametres?

Azimuth 10 degrees, vertical 4 degrees range 7 nm.

Azimuth 20 degrees, vertical 7 degrees range 9 nm.

Azimuth 30 degrees, vertical 10 degrees range 10 nm.

Azimuth 40 degrees, vertical 15 degrees range 15 nm.

#14. An area surveillance radar is most likely to have a frequency of?

350 MHz.

600 MHz.

100 Hz.

150 Hz.

#15. The maximum range obtainable from an ACT en-route surveillance radar is approximately?

50 to 100 nm.

100 to 200 nm.

200 to 300 nm.

300 to 400 nm.

#16. The maximum range of ground radar is limited by?

Pulse width.

Average power.

Pulse recurrence rate.

Peak power.

#17. A ground radar transmitting at a PRF of 1200 pulses per second will have a maximum unambiguous range of approximately?

27 nm.

67 nm.

135 nm.

270 nm.

#18. If a radar has a beam width of 3 degrees and a pulse length of 4 microsecond, the target azimuth resolution at a range of 60 nm will be approximately?

1 nm.

2 nm.

3 nm.

4 nm.

#19. A surveillance radar element (SRE) used to provide approach guidance?

Does not have a height determination capacity.

Can only be used to a point 3 miles from the threshould.

May not be used in heavy rain because of the high levels of signal loss.

Can be used to given guidance both horizontally and vertically.

#20. On which of the following radar displays is it possible to get an indication of the shape and to some extent type, of the aircraft generating the returns?

Secondary Surveillance Radar (SSR).

Airborne Weather Radar (AWR).

Aerodrome Surface Movement Radar (ASMR).

Aerodrome Surveillance Approach Radar.

#21. A surveillance radar installation will often consist of?

An SSR and a precision radar.

A primary radar and a VDF.

A primary radar and a secondary surveillance radar (SSR).

A primary radar and a precision radar.

#22. In order to be able to penetrate cloud, a primary radar signal must have?

A high PRF.

A short wavelength.

A long wavelength.

A high frequency.

#23. An SRA may be flown to?

2 nm using QFE unless the pilot advises the controller that the approach is to be flown on QNH.

0.5 m using QFE unless the pilot advises the controller that the approach is to be flown on QNH.

0.5 nm using QNH only.

2 nm using QNH only.

#24. A long range ATC surveillance radar will typically use a frequency of?