Q1. *** To improve the resolution of a radar display requires:
a narrow pulse width and a narrow beamwidth 1
Q2. % Assuming sufficient transmission power, the maximum range of a ground radar with a pulse repetition frequency of 450 pulses per second is: (Given: velocity of light is 300000 km/second)
333 km 2
Q3. * The minimum range of primary radar, using the pulse technique, is determined by the (i)………………….; the maximum unambiguous range by the (ii)……………
(i) pulse length; (ii) pulse recurrence frequency 3
Q4. The frequency band and rate of the scan of Airfield Surface Movement radars are:
SHF; 60 rpm 4
Q5. *** Which one of the following statements is correct concerning the use in the primary radar of continuous wave transmissions as compared with pulse transmissions?
It eliminates the minimum target reception range 6
Q6. #The bearing of a primary radar is measured by:
searchlight principle 8
Q7. *In which frequency band do most airborne weather, and ground-based ATC, radar systems operate?
SHF 9
Q8. # Which of the following radar equipment operate by means of the pulse technique? 1. Aerodrome surface Movement Radar 2. Airborne Weather Radar 3. Secondary Surveillance Radar (SSR) 4. Aerodrome Surveillance (approach) Radar
1, 2, 3 and 4 11
Q9. # What information may be displayed on an ATC radar screen connected only to a primary radar system?
Aircraft position only 12
Q10. In a primary radar using pulse technique, the ability to discriminate between targets in azimuth is a factor of:
Beam width 14
Q11. %****If a radar has a beam width of 5 degrees and, the target azimuth resolution at a range of 150 nm will be approximate
12.5 nm 16
Q12. * Which of the following types of radar systems are most suited for short-range operation?
Primary continuous wave 17
Q13. # A surveillance radar (ATC Radar) installation will often consist of?
A primary radar and a secondary surveillance radar (SSR) 19
Q14. * A moving target indicator (MTI)?
Rejects all stationary targets 20
Q15. #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:
(i) SHF (ii) 60 (iii) sometimes 21
Q16. # In relation to radar systems that use pulse technology, the term Pulse Recurrence Rate (PRR) signifies the:
Number of pulses per second 22
Q17. ## The advantages of the use of slotted antennas in modern radar technology is to:
Virtually eliminate lateral lobes and as a consequence concentrate more energy in the main beam 23
Q18. *** Which combination of characteristics gives the best screen picture in primary search radar?
Short pulse length and narrow beam 24
Q19. # 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?
Aerodrome Surface Movement Radar (ASMR) 26
Q20. % An echo is received from a target 900 microseconds after the pulse was transmitted. The range to the target is:
73 NM 27
Q21. # In a primary pulse radar, you have?
A directional aerial for both transmission and reception 28
Q22. ### The maximum range obtainable from an ATC en-route surveillance radar is approximate..
200 to 300 nm 30
Q23. *** The factor which determines the maximum range of a radar is:
pulse repetition rate 31
Q24. *The factor which limits the minimum detection range of a radar is:
pulse width 33
Q25. A primary radar system has a pulse repetition frequency of 450 PPS. Ignoring pulse width and fly back at the CRT, the maximum range of the radar would be:
180 NM 34
Q26. % A primary radar has a pulse repetition frequency of 275 PPS. The time interval between the leading edges of successive pulses is:
3.64 milliseconds 35
Q27. During a surveillance radar approach, the vertical position of the aeroplane, unless advised otherwise, is given in terms of?
Height above QFE threshold 36
Q28. * The main advantage of continuous-wave radars is:
no minimum range limitation 38
Q29. %****If a radar has a beam width of 3 degrees and a pulse length of 4 microseconds, the target azimuth resolution at a range of 60 nm will be approximate
3 nm 39
Q30. *** In order to be able to penetrate the cloud, a primary radar signal must- have?
A long wavelength 40
Q31. # A Primary radar operates on the principle of:
Pulse technique 41
Q32. *** An advantage of a phased array (slotted antenna) is:
all of the above 43
Q33. % A radar is designed to have a maximum range of 12 km. The maximum PRF that would permit this is:
12 500 pps 44
Q34. * To double the range of a primary radar would require the power to be increased by a factor of:
16 45
Q35. *** The use of Doppler techniques to discriminate between aircraft and fixed objects results in the second trace returns being generated. These are removed by:
jittering the PRF 46
