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CPL Test Series
Question Bank
Questions for RADAR THEORY
Answer the following questions
Test Mode
Training Mode
1. In which frequency band do must airborne weather, and ground based ATC, radar systems operate?
UHF.
SHF
EHF.
VHF.
2. What information may be displayed on an ATC radar screen connected only to primary radar system?
Aircraft position only.
Aircraft altitude.
Aircraft position and SSR code.
Aircraft position, SSR code and altitude.
3. In a primary radar using pulse technique, pulse recurrence frequency (PRF) pulse recurrence rate (PRR) determines
Maximum theoretical range.
Minimum range.
Beam width.
Target discrimination.
4. Echoes that do not change in distance from the antenna (relative speed zero) of a ground radar with a Moving Target Indicator (MIT) are dangerous for the following reason?
The frequency of the transmitted radar signals changes too much by the Doppler
The radar is not able to display two echoes moving in the direction.
The MTI does not recognise this as a moving object due to the blind speed.
The moving target indicator eliminates such echoes.
5. In a primary radar using pulse technique, pulse length determines
Minimum measurable range.
Beam width.
Maximum measurable range.
Target discrimination.
6. A ground radar transmitting at a PRF of 1200 pulse/second will have a maximum unambiguous range of approximately?
270 nm.
27 nm.
67 nm.
135 nm.
7. Ignoring the pulse length and the fly-back, a radar facility designed to have a maximum unambiguous range of 50 km will have a PRF (pulse per second) of?
330.
167.
6000
3000.
8. For any given circumstances, in order to double the effective range of a primary radar the power output must be increased by a factor of
8.
2.
4.
16.
9. A Primary radar operates on the principle of
Continuous wave transmission.
Phase comparison.
Transponder interrogation.
Pulse technique.
10. When an oerator increases the range on a radar display, in general?
Both the RPF and the pulse length increase..
The PRF becomes higher and the pule length smaller.
The PRF becomes lower and the pule Lengths larger.
Both the RPF and the pulse length decrease.
11. The maximum range obtainable from an ATC Long Range Surveilance Radar is approximately
300 NM.
100 NM.
400 NM.
200 NM.
12. In a primary radar using pulse technique, the ability to discriminate between targets in azimuth is factor of
Pulse length.
Aerial rotation rate.
Pulse Recurrence Rate (PRR).
Beam width.
13. A ground radar transmitting at a PRF of 1200 pulses/second will have a maximum unambiguous range of approximately
27 NM.
67 NM.
270 NM.
135 NM.
14. Which one of the following statements is correct concerning the use in primary radar of continuous wave transmissions as compared with pulse transmissions?
The equipment required is more complex in continuous wave radar but this is offset by greater reliability and accuracy.
It is less effective in short range radars but more effective in long range radars.
It eliminates the minimum target reception range.
A small common transmitter and receiver aerial can be used.
15. The maximum pulse repetition frequency (PRF) that can be used by a primary radar facility in order to detect targets unambiguously at a range of 50 NM is? (pps = pulses per second)
3240 pps.
1620 pps.
713 pps.
610 pps.
16. 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)
782 pps.
405 pps.
375 pps.
308 pps.
17. Assuming sufficient transmission power, the maximum range of a ground radar with a pulse repetition rate of 450 pulses per second is? (Given: Velocity of light = 300 000 km/sec.)
150 km.
333 km.
1333 km.
666 km.
18. The minimum range of a primary radar, using the pulse technique, is determined by the (i) ______; the maximum unambiguous range by the (ii) _______
(i) pulse length (ii) length of the timebase
(i) pulse length (ii) pulse recurrence frequency
(i) transmission frequency (ii) transmitter power output
(i) transmission frequency (ii) pulse recurrence frequency
19. A radio altimeter employing a continuous wave signal would have?
A directional aerial for transmission and an omni directional aerial for reception.
A directional aerial for both transmission and reception.
A directional aerial for transmission and another one for reception.
An omni directional aerial for transmission and a directional one for reception.
20. The prime factor in determining the maximum unambiguous range of a primary radar the
Height of the transmitter above the ground.
Size of parabolic receiver aerial.
Pulse recurrence rate.
Power output.
21. Which of the following radar equipments operate by means of the pulse technique? 1. Aerodrome Surface Movement Radar. 2. Airborne Weather Radar. 3. Secondary Survellance Radar (SSR). 4. Aerodome Survellance (approach) Radar
1, 2, 3 and 4.
2 and 4 only.
1, 2 and 4 only.
2, 3 and 4 only.
22. The theoretical maximum range for an Airborne Weather Radar is determined by the
Transmission power.
Transmission frequency.
Size of the aerial.
Pulse recurrence frequency.
23. A radar facility transmitting at a Pulse Recurrence Frequency (PRF) of 1500 pulses/second will have a maximum unambiguous range or approximately
27 NM.
54 NM.
270 NM.
135 NM.
24. The maximum pulse repetition frequency (PRF) that can be used by a primary radar facility to detect targets unambiguously to a range of 50 nm is?
1620 pps.
713 pps.
610 pps.
3240 pps.
25. The main factor which determines the minimum range that can be measured by a pulsed radar is pulse
Amplitude.
Frequency.
Repetition rate.
Length
26. Which combination of characteristics gives best screen picture in a primary search radar?
Short pulse length and narrow beam.
Long pulse length and wide beam.
Long pulse length and narrow beam.
Short pulse length and wide beam.
27. 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)
782 pps.
375 pps.
308 pps.
405 pps.
28. 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.
(i) EHF (ii) 100 (iii) never.
(i) EHF (ii) 30 (iii) never.
(i) SHF (ii) 10 (iii) always.
29. Comparing a parabolic reflector with a flat plate antenna of the same size?
The flat plate antenna generates less side lobes than the parabolic reflector.
The parabolic reflector has a considerably smaller beam wieh.
The flat plate antenna has considerably smaller beam width.
The parabolic reflector generates less side lobes then the flat plate antenna.
30. In relation to radar systems that use pulse technology, the term 'Pulse Recurrence Rate (PRR)' signifies the
Number of pulses per second.
Ratio of pulse period to pulse width.
The number of cycles per second.
Delay after which the process re-starts.
31. Ignoring pulse length and fly-back, a radar facility designed to have a maximum unambiguous range of 50 km will have a PRF (pulses per second) of
330
6000.
3000
167
32. The maximum range of primary radar depends on
Pulse length.
Frequency.
Wave length.
Pulse recurrence freqency.
33. Considering a primary radar system, what kind of aerials are used?
A directional antenna for transmitting, and an omini directional antenna for receiving.
One directional antenna both for transmitting and for receiving.
One directional antenna for transmitting and one for receiving.
An omni directional antenna for transmitting, and a directional antenna for receiving.
34. In a primary pulse radar you have?
A directional aerial for transmission and another one for reception.
A directional aerial for transmission and an omni directional aerial for reception.
A directional aerial for both transmission and reception.
An omni directional aerial for transmission and a directional one for reception.
35. In a primary pulse radar you have?
A directional aerial for both transmission and reception.
An omni directional aerial for transmission and a directional one for reception.
A directional aerial for transmission and an omni directional aerial for reception.
A directional aerial for transmission and another one for reception.
36. 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?
Secondary Surveilance Radar (SSR).
Airborne Weather Radar (AWR)
Aerodrome Surveilance (aaproach) Radar.
Aerodros Surface Movement Radar (ASMR).
37. The maximum range obtainable from an ATC Long range Surveillance Radar is approximately?
50 to 100 nm.
300 to 400 nm.
100 to 100 nm.
200 to 300 nm.
38. Assuming sufficient transmission power, the maximum range of a ground radar with a pulse repetition frequency of 450 pulses per second is: (Give: velocity of light is 300 000 km/second)
333 km.
666 km.
150 km.
1333 km.
39. The advantage of the slotted antennas in modern radar techology is to
Virtually eliminate lateral lobes and as a concenquene concentrate more energy in the main beam.
Eliminate the need for azimuth slaving.
Have a wide beam and an a consequence better target detection.
Simultaneously transmit weather and mapping beams.
40. Which of the following types of radar systems are most suited for short range operation?
Centimetric pulse.
Millimetric pulse.
Secondary continuous wave.
Primary continuous wave.
41. Which of the following equipments uses primary radar principles?
Global Positioning System (GPS)
Airborne weather radar (AWR)
Distance Measuring Equipment (DME).
Secondary Surveillance Radar (SSR).
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