Vayudoot Aviation

1. An aircraft tracking to intercept the Instrument Landing System (ILS) localiser inbound on the approach side, outside the published ILS coverage angle

will receive signals without identification coding

may receive false course indications

can expect signals to give correct indications

will not normally receive signals

2. What is the approximate maximum theoretical range at which an aircraft at FL130 could receive information from a VDF facility which is sited 1024 FT above MSL?

120 NM

150 NM

220 NM

180 NM

3. Which of the following types of radar systems are most suited for short range operation?

millimetric pulse

secondary continuous wave

primary continuous wave

centimetric pulse

4. The advantage of the use of slotted antennas in modern radar technology is to

simultaneously transmit weather and mapping beams

have a wide beam and as a consequence better target detection

virtually eliminate lateral lobes and as a consequence concentrate more energy in the main beam

eliminate the need for azimuth slaving

5. A DME station is located 1000 feet above MSL. An aircraft flying at FL 370, 15 NM away from the DME station, will have a DME reading of

15 NM

14 NM

16 NM

17 NM

6. In the NAVSTAR/GPS satellite navigation system, 'Selective Availability' (SA) gives the option to artificially degrade the accuracy by

shutting off selected satellites

offsetting satellite atomic clocks by a predetermined constant amount

using a less accurate atomic clock in a satellite for signal processing

dithering the satellite clock

7. In an Electronic Flight Instrument System (EFIS) data relating primarily to navigation is provided by

Inertial Reference SystemsNavigation radiosTrue airspeed and drift inputs

Inertial Reference SystemsAircraft Mapping RadarNavigation radios

Flight Management ComputerAircraft Mapping RadarNavigation radios

Navigation radiosFlight Management ComputerInertial Reference Systems

8. Factors liable to affect most NDB/ADF system performance and reliability include

static interference - night effect - absence of failure warning system

static interference - station interference - latitude error

coastal refraction - lane slip - mountain effect

height error - station interference - mountain effect

9. In general the operation of airborne weather radar equipment on the ground is

totally prohibited

only permitted with certain precautions, to safeguard health of personnel and to protect equipment

permitted anywhere

unrestrictedly permitted in aerodrome maintenance areas

10. The Doppler Navigation System is based on

radar principles using frequency shift

phase comparison from ground station transmissions

doppler VOR (DVOR) Navigation System

radio waves refraction in the ionosphere

11. Which of the following statements about the accuracy that can be obtained with the differential technique (D-GPS) of the satellite navigation system NAVSTAR/GPS is correct?

The increase in accuracy of position fixes is independent of the receiver position in relation to a D-GPS ground station

Only D-GPS allows position fixes accurate enough for 'Non Precision Approaches'

The nearer a receiver is situated to a D-GPS ground station, the more accurate the position fix

A D-GPS receiver can detect and correct for SA providing a more accurate position fix

12. Which one of the following inputs to an Area Navigation System (R-NAV) comes from an external, not on-board, system?

Inertial Navigation System (INS) position

Pressure altitude

Magnetic heading

VOR/DME radial/distance

13. Signal reception is required from a minimum number of satellites that have adequate elevation and suitable geometry in order for a Satellite-Assisted Navigation System (GNSS/GPS) to carry out independent three dimensional operation, Receiver Autonomous Integrity Monitoring (RAIM) and to isolate any faulty satellite and remove it from contributing to the navigation solution. The number of satellites is

5

6

4

7

14. An airway 10 NM wide is to be defined by two VORs each having a resultant bearing accuracy of plus or minus 5.5°. In order to ensure accurate track guidance within the airway limits the maximum distance apart for the transmitter is approximately

105 NM

50 NM

165 NM

210 NM

15. Erratic indications may be experienced when flying towards a basic VOR/DMEbased Area Navigation System 'Phantom Station'

when in the cone of silence overhead the Phantom Station

when operating at low altitudes close to the limit of reception range from the reference station

when the Phantom Station is out of range

because, under adverse conditions (relative bearing to the Phantom Station other than 180°/360°) it takes the computer more time to calculate the necessary information

16. 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) pulse recurrence frequency

(i) transmission frequency (ii) pulse recurrence frequency

(i) pulse length (ii) length of the timebase

(i) transmission frequency (ii) transmitter power output

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

static interference is minimised

less power output is required in the mapping mode

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

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

18. An aircraft on a heading of 280°(M) is on a bearing of 090°(M) from a VOR. The bearing you should select on the OMNI bearing selector to centralise the VOR/ILS left/right deviation needle with a 'TO' indication is

280°

090°

100°

270°

19. In which frequency band do VOR transmitters operate?

VHF

EHF

UHF

SHF

20. What is the maximum theoretical range that an aircraft at FL150 can receive signals from a VOR situated 609 feet above MSL?

184 NM

147 NM

156 NM

220 NM

21. Why is a secondary radar display screen free of storm clutter?

The frequencies employed are too high to give returns from moisture sources

The principle of 'echo' return is not used in secondary radar

A moving target indicator facility suppresses the display of static or near static returns

The frequencies employed are too low to give returns from moisture sources

22. An aircraft is flying on the true track 090° towards a VOR station located near the equator where the magnetic variation is 15°E. The variation at the aircraft position is 8°E.The aircraft is on VOR radial

285°

262°

278°

255°

23. In which mode of operation does the aircraft weather radar use a cosecant radiation pattern

MANUAL

MAPPING

CONTOUR

WEATHER

24. 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

3

2

16

8

25. What is the minimum level that an aircraft, at a range of 113 NM, must fly in order to contact the tower on R/T for a VDF bearing from an airport sited 169 FT above MSL?

FL50

FL60

FL80

FL100

26. Which combination of characteristics gives best screen picture in a primary search radar?

long pulse length and narrow beam

long pulse length and wide beam

short pulse length and narrow beam

short pulse length and wide beam

27. A DME that has difficulty obtaining a ""lock-on"":(NOTE: PRF = pulse recurrence frequency, PPS = pulses per second)

stays in search mode without a reduction in PRF

alternates search mode with periods of memory mode lasting 10 seconds

stays in search mode but reduces PRF to max. 60 PPS after 15000 pulse pairs have been transmitted

stays in search mode but reduces PRF to max. 60 PPS after 100 seconds

28. Which one of the following is an advantage of a Microwave Landing System (MLS) compared with an Instrument Landing System (ILS)?

There is no restriction on the number of ground installations that can be operated because there is an unlimited number of frequency channels available

It is insensitive to geographical site and can be installed at sites where it is not possible to use an ILS

The installation does not require to have a separate method (marker beacons or DME) to determine range

It does not require a separate azimuth (localiser) and elevation (azimuth) transmitter

29. Which of the following statements concerning the variable, or directional, signal of a conventional VOR is correct?

The receiver adds 30 Hz to the variable signal before combining it with the reference signal

The transmitter changes the frequency of the variable signal by 30 Hz either side of the allocated frequency each time it rotates

The receiver adds 30 Hz to the variable signal before combining it with the reference signal

The rotation of the variable signal at a rate of 30 times per second gives it the characteristics of a 30 Hz amplitude modulation

30. If an aircraft flies along a VOR radial it will follow a

constant magnetic track

line of constant bearing

rhumbline track

great circle track

31. Under JAR-25 colour code rules for Electronic Flight Instrument Systems (EFIS), a selected heading is coloured

magenta

white

green

yellow

32. What type of satellite navigation system NAVSTAR/GPS receiver is most suitable for use on board an aircraft?

Multiplex

Sequential

Multichannel

Any hand held type

33. What is the wavelength of an NDB transmitting on 375 kHZ?

800 m

8 m

80 m

8000 m

34. 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)

375 pps

405 pps

308 pps

782 pps

35. Which of the following Secondary Surveillance Radar (SSR) codes is used to indicate transponder malfunction?

9999

4096

7600

36. The theoretical maximum range for an Airborne Weather Radar is determined by the

transmission power

transmission frequency

pulse recurrence frequency

size of the aerial

37. In order to indicate radio failure the aircraft SSR transponder should be selected to code

7000

7500

7700

7600

38. What is the deviation per dot on the HSI when using an 2-dot RNAV system in the approach mode?

0.5 NM

10 NM

0.5°

10°

39. Which of the following cloud types is most readily detected by airborne weather radar when using the 'weather beam'?

cumulus

stratus

altostratus

cirrocumulus

40. Which of the following frequency-bands is used by the Loran C navigation system?

90 - 110 kHz

1750 - 1950 kHz

978 - 1213 MHz

10.2 - 13.6 kHz

41. Outer marker transmits on 75 MHz and has an aural frequency of

2000 Hz

1300 Hz

400 Hz

3000 Hz

42. Where, in relation to the runway, is the ILS localiser transmitting aerial normally situated?

At the approach end of the runway about 300 m from touchdown on the centreline

At the approach end about 150 m to one side of the runway and 300 m from touchdown

On the non-approach end of the runway about 300 m from the runway on the extended centreline

At the non-approach end about 150 m to one side of the runway and 300 m along the extended centreline

43. The ISO-ECHO facility of an airborne weather radar is provided in order to

detect areas of possible severe turbulence in cloud

extend the mapping range

give an indication of cloud tops

inhibit unwanted ground returns

44. What datum is used for the Minimum Descent Altitude (MDA) on a non-precision approach when using the NAVSTAR/GPS satellite navigation system?

Barometric altitude

Radar altitude

GPS altitude

If using Differential-GPS (D-GPS) the altitude obtained from the D-GPS, otherwise barometric altitude

45. The two signals transmitted by a conventional VOR ground station are 90° out of phase on magnetic

east

north

south

west

46. In order to indicate unlawful interference with the planned operation of the flight, the aircraft Secondary Surveillance Radar (SSR) transponder should be selected to

7000

7700

7600

7500

47. An aircraft is 100 NM from a VOR facility. Assuming no error when using a deviation indicator where 1 dot = 2° deviation, how many dots deviation from the centre line of the instrument will represent the limits of the airway boundary? (Assume that the airway is 10 NM wide)

1.5

4.5

3.0

6.0

48. Which of the following statements about the 'visibility' of NAVSTAR/GPS satellites is correct?

It is greatest at the poles

It varies, depending on the time and observer's location

It is the same throughout the globe

It is greatest at the equator

49. Which frequency band is used by VOR transmissions?

SHF

UHF

HF

VHF

50. Which of the following is the datum for altitude information when conducting flights under IFR conditions on airways using the NAVSTAR/GPS satellite navigation system?

GPS altitude

Barometric altitude

GPS altitude if 4 or more satellites are received otherwise barometric altitude

The average of GPS altitude and barometric altitude

Question Bank

Questions for INDIGO RADIO NAVIGATION