DGCA Air Navigation: Ground Radar Questions
39 exam-style Ground Radar questions for the DGCA Air Navigationpaper (CPL & ATPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.
- Q1
On which of the following radar displays is it possible to get an indication of the shape, and to some extent the type, of the aircraft generating the return?
- AAerodrome Surface Movement Radar (ASMR)
- B Secondary Surveillance Radar (SSR)
- CAerodrome Surveillance (approach) Radar
- DAirborne Weather Radar (AWR)
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Correct answer: A. Aerodrome Surface Movement Radar (ASMR)
Aerodrome Surface Movement Radar uses very short wavelengths and high resolution, so its returns can reveal the shape and, to some extent, the type of the aircraft producing them.
- Q2
Complete the following statement. Aircraft Surface movement Radar operates on frequencies in the (i) .......... band employing an antenna that rotates at approximately (ii) .......... revolutions per minute, it is (iii) ......... possible to determine the type of aircraft from the return on the radar screen.
- A (i) SHF (ii) 60 (iii) sometimes
- B(i) EHF (ii) 30 (iii) never
- C (i) SHF (ii) 10 (iii) always
- D (i) EHF (ii) 100 (iii) never
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Correct answer: A. (i) SHF (ii) 60 (iii) sometimes
Surface movement radar works in the SHF band with a rapidly rotating antenna at about 60 rpm for a fast update, and its resolution is such that aircraft type can sometimes, but not reliably, be inferred.
- Q3
The maximum range obtainable from an ATC Long Range Surveillance Radar is approximately:
- A 300 NM
- B 200 NM
- C 100 NM
- D 400 NM
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Correct answer: A. 300 NM
An ATC long-range surveillance radar provides coverage to approximately 300 NM.
- Q4
A primary radar has a pulse repetition frequency of 275 pps. The time interval between the leading edges of successive pulses is:
- A3.64 milliseconds.
- B36.4 milliseconds.
- C3.64 microseconds.
- D36.4 microseconds.
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Correct answer: A. 3.64 milliseconds.
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- Q5
A primary radar system has a pulse repetition frequency of 450 pps. Ignoring pulse width and flyback at the CRT, the maximum range of the radar would be:
- A333 nm
- B180 nm
- C666 nm
- D360 nm
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Correct answer: B. 180 nm
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- Q6
When flying a Precision Approach Radar in the UK, vertical displacement is based upon:
- ARegional QNH
- BQFE
- CQFF
- DAirfield QNH
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Correct answer: B. QFE
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- Q7
The frequency band and rate of scan of Airfield Surface Movement radars are:
- ASHF; 60RPM
- BSHF; 200RPM
- CEHF; 100RPM
- DEHF; 10RPM
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Correct answer: A. SHF; 60RPM
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- Q8
When carrying out a precision radar approach, talkdown normally ceases at _______ nm from touchdown:
- A0.5 nm
- B2 nm
- C3 nm
- D5 nm
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Correct answer: A. 0.5 nm
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- Q9
A ground based radar with a scanner rotation of 60rpm, a beam width in the order of .5° and a PRF of 10000pps would be:
- Aan Airfield Surface Movement Indicator with a theoretical range of 8nm.
- Ba Precision Approach Radar.
- Can Airfield Surface Movement Indicator with a theoretical range of 16nm.
- Da high resolution Surveillance Approach Radar.
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Correct answer: A. an Airfield Surface Movement Indicator with a theoretical range of 8nm.
This Explanation is Coming Soon
- Q10
The SHF band has been selected for Airfield Surface Movement Indicator (ASMI) radars in preference to the EHF band because:
- Athe EHF band causes unacceptable radiation hazards to personnel.
- Bthe attenuation caused by precipitation is greater in the EHF band and reduces the radar’s effective range and usefulness.
- Cthe EHF band is not suitable for the provision of the very narrow beams needed for an ASMI radar.
- Dtarget discrimination using the SHF band is better.
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Correct answer: B. the attenuation caused by precipitation is greater in the EHF band and reduces the radar’s effective range and usefulness.
This Explanation is Coming Soon
- Q11
ATC area surveillance radars will normally operate to a maximum range of:
- A100 nm
- B200 nm
- C300 nm
- D400 nm
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Correct answer: C. 300 nm
This Explanation is Coming Soon
- Q12
Complete the following statement. Aircraft Surface movement Radar operates on frequencies in the (i) .......... band employing an antenna that rotates at approximately (ii) .......... revolutions per minute, it is (iii) ......... possible to determine the type of aircraft from the return on the radar screen.
- A (i) SHF (ii) 60 (iii) sometimes
- B (i) EHF (ii) 30 (iii) never
- C(i) SHF (ii) 10 (iii) always
- D (i) EHF (ii) 100 (iii) never
Show answer
Correct answer: A. (i) SHF (ii) 60 (iii) sometimes
Aerodrome surface movement radar operates in the SHF band with an antenna turning at about 60 revolutions per minute for a rapid update, and its high resolution means it is sometimes possible to infer the type of aircraft from the return.
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