Vayudoot Aviation

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

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

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

2. The code transmitted by a SSR transponder consists of

amplitude differences

frequency differences

pulses

phase differences

3. In order to enter a waypoint that is designated by a VOR into an RNAV, the VOR

has to be positively identified by one of the pilots

does not have to be in range when entered but must be when used

does not have to be in range when entered or used

must be in range

4. Which one of the following lists information given by a basic VOR/DME-based Area Navigation System?

Aircraft position in latitude and longitude

Crosstrack distance, alongtrack distance, angular course deviation

Wind velocity

True airspeed, drift angle

5. The pencil shaped beam of an airborne weather radar is used in preference to the mapping mode for the determination of ground features

beyond 50 to 60 NM because more power can be concentrated in the narrower beam

beyond 150 NM because the wider beam gives better definition

beyond 100 NM because insufficient antenna tilt angle is available with the mapping mode

when approaching coast-lines in polar regions

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

10.2 - 13.6 kHz

90 - 110 kHz

1750 - 1950 kHz

978 - 1213 MHz

7. 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

167

3000

6000

8. Every 10 kt decrease in groundspeed, on a 3° ILS glidepath, will require an approximate

increase in the aircraft's rate of descent of 50 FT/MIN

increase in the aircraft's rate of descent of 100 FT/MIN

decrease in the aircraft's rate of descent of 50 FT/MIN

decrease in the aircraft's rate of descent of 100 FT/MIN

9. 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

090°

280°

100°

270°

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

400 Hz

1300 Hz

3000 Hz

2000 Hz

11. ILS is subject to false glide paths resulting from

spurious signals reflected by nearby obstacles

ground returns ahead of the antennas

back-scattering of antennas

multiple lobes of radiation patterns in the vertical plane

12. The main factor which determines the minimum range that can be measured by a pulsed radar is pulse

amplitude

frequency

repetition rate

length

13. The frequency range of a VOR receiver is

108 to 135.95 MHz

108 to 111.95 MHz

118 to 135.95 MHz

108 to 117.95 MHz

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

210 NM

165 NM

105 NM

50 NM

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

MANUAL

WEATHER

CONTOUR

MAPPING

16. Which of the following geometric satellite constellations provides the most accurate NAVSTAR/GPS position fix?

3 satellites with a low elevation above the horizon and an azimuth of 120° from each other together with a fourth directly overhead

4 satellites with an azimuth of 90° from each other and a low elevation above the horizon

4 satellites with an azimuth of 90° from each other and an elevation of 45° above the horizon

3 satellites with an azimuth of 120° from each other and an elevation of 45° above the horizon

17. The aircraft DME receiver cannot lock on to interrogation signals reflected from the ground because

DME transmits twin pulses

aircraft transmitter and DME ground station are transmitting on different frequencies

DME pulse recurrence rates are varied

reflections are subject to doppler frequency shift

18. An aircraft at 6400 FT will be able to receive a VOR groundstation at 100 FT above MSL at an approximate maximum range of

90 NM

100 NM

120 NM

110 NM

19. Which component of the B737-400 Electronic Flight Instrument System generates the visual displays on the EADI and EHSI?

Flight Management Computer

Flight Control Computer

Symbol Generator

Navigation database

20. Precision RNAV (P-RNAV) requires a track-keeping accuracy of

1.0 NM standard deviation or better

0.5 NM standard deviation or better

0.25 NM standard deviation or better

1.5 NM standard deviation or better

21. The advantage 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

eliminate the need for azimuth slaving

simultaneously transmit weather and mapping beams

have a wide beam and as a consequence better target detection

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

size of the aerial

transmission frequency

transmission power

pulse recurrence frequency

23. In the NAVSTAR/GPS satellite navigation system, what is the maximum time taken to receive the complete set of almanac data from all satellites?

12.5 minutes (= 30 seconds per data frame)

24 seconds (= 1 second per data frame)

12 hours (= period of the satellites orbit)

25 seconds (= 1 second per data frame)

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

east

west

south

north

25. The maximum theoretical range at which an aircraft at FL210 may receive signals from a VOR facility sited 340 feet above mean sea level is approximately

183 NM

245 NM

204 NM

163 NM

26. In relation to the NAVSTAR/GPS satellite navigation system, what is involved in the differential technique (D-GPS)?

Receivers from various manufacturers are operated in parallel to reduce the characteristical receiver noise error

The difference between signals transmitted on the L1 and L2 frequencies are processed by the receiver to determine an error correction

Signals from satellites are received by 2 different antennas which are located a fixed distance apart. This enables a suitable receiver on the aircraft to recognise and correct for multipath errors

Fixed ground stations compute position errors and transmit correction data to a suitable receiver on the aircraft

27. A DME in tracking mode subsequently experiences a reduction in signal strength will switch the equipment in the first instance to

search mode

signal controlled search

memory mode

standby mode

28. An aircraft is on radial 120 with a magnetic heading of 300°, the track selector (OBS) reads : 330. The indications on the Course Deviation Indicator (CDI) are 'fly'

right with 'TO' showing

right with 'FROM' showing

left with 'FROM' showing

left with 'TO' showing

29. An RMI indicates aircraft heading. To convert the RMI bearings of NDBs and VORs to true bearings the correct combination for the application of magnetic variation is

NDB: beacon positionVOR: beacon position

NDB: aircraft positionVOR: beacon position

NDB: beacon positionVOR: aircraft position

NDB: aircraft positionVOR: aircraft position

30. The maximum range of primary radar depends on

pulse recurrence frequency

pulse length

frequency

wave length

31. The BFO selector on an ADF receiver is used to

stop loop rotation

hear the IDENT of some NDB stations radiating a continuous wave signal

hear the IDENT and must always be switched ON

find the loop 'null' position

32. In which of the following cases would ETOs and ETA at destination calculated by the Flight Management Computer (FMC) be correct?

When the FMC computes each ETO and ETA using the correct GS

When the actual winds match the forecast winds, and the actual cruising Mach number is equal to the FMC calculated Mach number

When the ETOs and ETA are based on the forecast winds calculated from the actual takeoff time

When the FMC positions and GS are accurate

33. The distance between a NAVSTAR/GPS satellite and receiver is

determined by the time taken for the signal to arrive from the satellite multiplied by the speed of light

calculated from the Doppler shift of the known frequencies

determined by the phase shift of the Pseudo Random Noise code multiplied by the speed of light

calculated, using the WGS-84 reference system, from the known positions of the satellite and the receiver

34. In Airborne Weather Radar (AWR), the main factors which determine whether a cloud will be detected are

size of the water drops,diameter of radar scanner

size of the water drops,wavelength/frequency used

range from cloud,wavelength/frequency used

rotational speed of radar scanner,range from cloud

35. Which of the following lists all the parameters that can be determined by a GPS receiver tracking signals from 4 different satellites?

Latitude and longitude

Latitude, longitude and altitude

Latitude, longitude, altitude and time

Latitude, longitude and time

36. ICAO specifications are that range errors indicated by Distance Measuring Equipment (DME) should not exceed

+ or - 0.5 NM or 3% of the distance measured whichever is the greater

+ or - 0.25 NM plus 1.25% of the distance measured

+ or - 1.25 NM plus 0.25% of the distance measured

+ or - 0.25 NM plus 3% of the distance measured up to a maximum of 5 NM

37. In a Satellite-Assisted Navigation system (GNSS/GPS) a position line is obtained by

the aircraft's receiver measuring the time difference between signals received from a minimum number of satellites

the aircraft's receiver measuring the phase angle of the signal received from a satellite in a known position

timing the period that is taken for a transmission from the aircraft's transmitter/receiver to reach and return from a satellite in a known position

timing the period that is taken for a satellite's transmission to reach the aircraft's receiver

38. At what approximate height above the WGS-84 ellipsoid are NAVSTAR/GPS satellites circling the earth?

36000 km

19500 km

10900 km

20200 km

39. Given:Aircraft heading 160°(M),Aircraft is on radial 240° from a VOR,Selected course on HSI is 250°.The HSI indications are deviation bar

behind the aeroplane symbol with the TO flag showing

behind the aeroplane symbol with the FROM flag showing

ahead of the aeroplane symbol with the FROM flag showing

ahead of the aeroplane symbol with the TO flag showing

40. Instrument Landing Systems (ILS) Glide Paths provide azimuth coverage (i) .......... ° each side of the localiser centre-line to a distance of (ii) .......... NM from the threshold

(i) 8 (ii) 10

(i) 35 (ii) 25

(i) 5 (ii) 8

(i) 25 (ii) 17

41. A frequency of airborne weather radar is

93.75 MHz

9375 MHz

9375 kHz

9375 GHz

42. One of the tasks of the space segment of the satellite navigation system NAVSTAR/ GPS is to

transmit signals to suitable receivers and to monitor the orbital planes autonomously

compute the user position from the received user messages and to transmit the computed position back to the user segment

transmit signals which can be used, by suitable receivers, to determine time, position and velocity

monitor the satellites' orbits and status

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

VOR/DME radial/distance

Pressure altitude

Magnetic heading

Inertial Navigation System (INS) position

44. Which of the following statements concerning LORAN-C is correct?

It is a navigation system based on secondary radar principles, position lines are obtained in sequence from up to eight ground stations

It is a hyperbolic navigation system that works on the principle of range measurement by phase comparison

It is a navigation system based on simultaneous ranges being received from a minimum of four ground stations

It is a hyperbolic navigation system that works on the principle of differential range by pulse technique

45. Concerning the NAVSTAR/GPS satellite navigation system, what is the meaning of the term 'Receiver Autonomous Integrity Monitoring' (RAIM)?

It is the ability of the GPS satellites to check the integrity of the data transmitted by the monitoring stations of the ground segment

It is a technique whereby the receivers of the world-wide distributed monitor stations (ground segment) automatically determines the integrity of the navigation message

It is a method whereby a receiver ensures the integrity of the Pseudo Random Noise (PRN) code transmitted by the satellites

It is a technique by which a receiver ensures the integrity of the navigation information

46. Which of the following statements concerning the L1 and L2 NAVSTAR/GPS transmission frequencies and codes is correct?

C/A and P codes are transmitted at different times on both frequencies

The lower frequency is used to transmit both the C/A and P codes

The higher frequency is used to transmit both the C/A and P codes

The higher frequency is only used to transmit the P code

47. There are two NDBs, one 20 NM inland, and the other 50 NM inland from the coast. Assuming that the error caused by coastal refraction is the same for both propagations, the extent of the error in a position line plotted by an aircraft that is over water will be

greater from the beacon that is 20 NM inland

the same from both beacons when the aircraft is on a relative bearing of 090° and 270°

the same from both beacons when the aircraft is on a relative bearing of 180° and 360°

greater from the beacon that is 50 NM inland

48. An aircraft is required to approach a VOR via the 104° radial. Which of the following settings should be made on the VOR/ILS deviation indicator?

104° with the FROM flag showing

284° with the TO flag showing

284° with the FROM flag showing

104° with the TO flag showing

49. 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

782 pps

405 pps

308 pps

50. In the MAPPING MODE the airborne weather radar utilises a

fan shaped beam effective up to a maximum of 50 NM to 60 NM range

pencil beam to a maximum range of 60 NM

pencil beam effective from zero to 150 NM

fan shaped beam effective up to a range of 150 NM

Question Bank

Questions for INDIGO RADIO NAVIGATION