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166 Cards in this Set
- Front
- Back
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What is true of GPS?
a its 95% horizontal accuracy is 100m b its 95% vertical accuracy is 300m c it has a total of 6 satellites d no 2 satellites share the same orbit |
a its 95% horizontal accuracy is 100m
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Radio altimeter operates on what principle?
a Frequency modulation b Amplitude modulation c Phase comparison d Doppler shift comparison |
a Frequency modulation
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What is true of GPS?
a For non-military users, the greatest source of error is in the assumption that the Earth is a perfect sphere. b Navigation is provided in 3D. c 2 satellites can provide a fix. d The orbital period is 6-9 hours. |
b Navigation is provided in 3D.
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What is true of MLS?
a Aircraft does not need to transmit b Similar approaches to ILS c Coverage is 80 degrees in azimuth d Less glidepath variation compared to ILS |
c Coverage is 80 degrees in azimuth
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The principle of LORAN-C determines position _____ using _______ from master/slave
indicators. a lines; range b circles; range c lines; difference in range d circles; difference in range |
c lines; difference in range
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What is the approximate PRR if a primary radar with max unambiguous range of 160nm?
(520pps) 6 HF produces best results in a sunrise b sunset c midnight d midday |
d midday
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NDB ICAO frequency range:
a 200kHz to 1750kHz b 400kHz to 683kHz |
a 200kHz to 1750kHz
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What is the frequency of the single side-band with carrier frequency X and amplitude
modulated signal of frequency Y? a SSB X+Y b SSB X+2Y c SSB X-Y d DSB X+Y and X-Y |
d DSB X+Y and X-Y
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If the transmitter and receiver are both moving, the change in frequency is proportional to
a phase difference b relative speed c speed of transmitter d speed of receiver |
b relative speed
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Which of the following factors affect the max range of a primary ground radar?
i Height of radar head ii Attitude/aspect of aircraft with respect to radar a i only b ii only c both d neither |
d neither
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Aircraft is 4nm away from the threshold. Glideslope indicator shows maximum deviation
indicating fly up. What is its height below the glidepath? a 290ft b 320ft c 270ft d 350ft |
a 290ft
b 320ft |
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What is true of LORAN-C?
i Master station gives warning signal if unserviceable ii Sky waves reduce the max range of the signal a i only b ii only c both d neither |
i Master station gives warning signal if unserviceable
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Which of the following is within the L-band?
a 2500MHz b 1500MHz c 3000MHz d 4500MHz |
b 1500MHz
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Which of the following in GPWS are reportable incidents?
a All alerts and warnings b All alerts and some warnings c Some alerts and all warnings d Some alerts and warnings |
c Some alerts and all warnings
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What is an input of GPWS? (AVIFG)
a Glideslope deviation b AoA c ASI |
a Glideslope deviation
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What is true of the TGT function in AWR?
i ‘TGT’ flashes when a CB cloud return is detected ahead ii A red ‘T’ replaces ‘TGT’ when the CB cell is within 300nm from the aircraft a i only b ii only c both d neither |
i ‘TGT’ flashes when a CB cloud return is detected ahead
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Which statement is true of MLS?
a Uses 2 static beams b Less site error than ILS c No back beam d Same landing profile as ILS |
b Less site error than ILS
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Loran C operates on which frequency band?
a LF b MF c HF d VLF |
a LF
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TCAS II gives audio alerts for
a RA only b TA only c RA and TA d Never |
c RA and TA
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What is the wavelength of 675 MHz?
a 4.4 m b 44 cm c 44 m d 0.44 cm |
b 44 cm
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What is true about radio waves?
i Any point on the wave is considered modulated. ii Signals of the same frequency have the same phase a 1 only b 2 only c 1 and 2 d Neither |
d Neither
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The longest groundwave range can be achieved if the transmitting aerial ____ and the receiving
aerials _______. a is vertically polarised, is horizontally polarised b is horizontally polarised, is vertically polarised c is vertically polarised, is vertical polarised d is horizontally polarised, is horizontally polarised |
c is vertically polarised, is vertical polarised
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NDB promulgated range
a prevents interferences from other stations on the same frequency by day only b prevents interferences from other stations on the same frequency by night only c prevents interferences from other stations on the same frequency by day and night. |
a prevents interferences from other stations on the same frequency by day only
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The central data processing unit of a GPWS receives input from
a AOA b Glidepath deviation c TAS |
b Glidepath deviation
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A/C travelling at G/S 250 kts. At 1110 the same NDB bears 280°R and at 1122 NDB bears 320°R) .
What is the distance from the NDB at 1122? a 50 nm b Insufficient data c 100nm d 71 nm |
a 50 nm
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In ILS localizer system, the position relative to the centreline is determined by difference in
a ……………….. b Depth of modulation c Modulation frequencies d Phase modulation |
b Depth of modulation
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What is the azimuth angle of MLS?
a ± 40 b ± 20 c ± 80 d ± 10 |
a ± 40
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What is true of AWR?
a It uses SHF band. b Cosecant beam used in MAP and MAN. c 10 to 20 cm wavelength. d Uses 10 degree beam. |
a It uses SHF band.
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The accuracy of a class B true bearing of an A/C from a VDF station is
a ± 2 QUJ b ± 2 QTE c ± 5 QTE d ± 5 QDR |
c ± 5 QTE
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For TCAS II to have some form of effectiveness, the approaching a/c must have
a TCAS II b Mode S SSR c Some form of transponder |
c Some form of transponder
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What technique does AWR use?
a Doppler b Secondary pulse c Primary pulse d Phase comparison |
c Primary pulse
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When will the signals of a slave station reach the a/c before the master signal?
a Never b When the a/c is nearer to the slave station c When the a/c is at the extended baseline of the slave station d All situations |
a Never
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Quadrantal error is caused by?
a ………………. b receiving a signal at 45 degree relative bearing to NDB signal c ……………… d re-radiation of signals from a/c metallic surface |
d re-radiation of signals from a/c metallic surface
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In Iso-echo mode, AWR can be used to
a avoid CAT b detect and avoid turbulences in cloud |
b detect and avoid turbulences in cloud
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For VOR, the station will shut down when power is less than
a 20% b 15% c 50% d 75% |
b 15%
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The most severe static is experienced at
a HF b VLF c LF |
b VLF
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Frequency of HF is
a 3 – 30 MHz b 300 – 3000 KHz c 300 – 3000 MHz d 30 – 300 GHz |
a 3 – 30 MHz
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What is the alert for GPWS Mode 3?
a Whoop, Whoop b Don’t Sink c Too Low, Terrain d Terrain, Terrain |
b Don’t Sink
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What is true of GPS?
a Line of sight not necessary. b Error due to diurnal variation is negligible for practical purposes. c Satellites are 1900 nm above ground level. d There are only 5 orbits. |
b Error due to diurnal variation is negligible for practical purposes.
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What is true about RNAV?
i cannot be used with Doppler VOR ii can be used with inertial navigation a 1 only b 2 only c 1 and 2 d Neither 1 nor 2 |
ii can be used with inertial navigation
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A DOC coverage of 60/27000 means coverage is provided for a range of 60nm _________.
a or 27000 ft or below b or 27000 ft or above c and 27000 ft or below d and 27000 ft or above |
c and 27000 ft or below
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When the DME is on “Quick Search” mode and if there is no lock-on, the pulses per second
_______ and then it _________ when lock-on is made. a decreases, decreases b increases, increases c increases, decreases d decreases, increases |
a decreases, decreases
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What is the effect of D layer on the performance of radio aids using LF and MF frequency?
a Prevents useful returns by day. b Has no effect. c Prevents useful returns by night |
a Prevents useful returns by day.
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SSR mode A, B, C, D are differentiated by
a pulse width b modulation c differing frequency d pulse spacing |
d pulse spacing
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NDB scans an unmodulated wave that consists of a continuous carrier wave during the
identification. The wave is a _____________ and the BFO ____________to hear the tone. a N0N A1A, need not to be on b N0N A1A, must be on c P0N A2A, must be on d A2A , need to be on |
b N0N A1A, must be on
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When you are asked to change SSR code by ATC, you should
a immediately cycle through to the new code b switch to standby mode and then cycle through to the new code |
b switch to standby mode and then cycle through to the new code
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In Loran C, mutual interference between chains are avoided because
a each chain is allocated a specific GRI |
a each chain is allocated a specific GRI
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Which of the following describes the correct order of a transmitter?
a Oscillator – AF Amplifier – Modulator b AF Amplifier – Modulator – Oscillator c Modulator – Oscillator – AF Amplifier |
a Oscillator – AF Amplifier – Modulator
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GPS is able to transmit its position relative to satellite transmitter and thus to Earth because it
a transmits its orbit position to Earth b fixed its orbital position c respond to interrogation like DME d establish a hyberbolic lattice over the Earth’s surface |
a transmits its orbit position to Earth
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A VOR transmits omni-directional signal and a (i) ___________ limacon signal and uses (ii)
_____________ comparison a (i) rotating , (ii) phase b (i) stationary , (ii) phase |
a (i) rotating , (ii) phase
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Frequency of EHF
a 3 – 30 Mhz b 30 – 300 Mhz c 300 – 3000 Mhz d 30000 – 300000 Mhz |
d 30000 – 300000 Mhz
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What is true of RNAV?
a Some use point Nav only b Cannot use DME only c Cannot use VOR/DME only |
a Some use point Nav only
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What is true of RNAV?
a It reduces ATC flow capacity b It can include Inertia Navigation |
b It can include Inertia Navigation
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Mode S of SSR can
a air to air data uplink b transmit on UHF c uplink only |
b transmit on UHF
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What is true of Mode S?
a It is a component of full TCAS b Requires ident before usage |
a It is a component of full TCAS
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What is true of mountain effect in ADF?
a It reduces as altitude is increased b It is significant only if broadcasting is used c It causes fluctuations in signal strength but not bearing signals d It causes bearing errors but not fluctuations in signal strength |
a It reduces as altitude is increased
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What is the Loran C frequency?
a 10Khz b 100Khz c 1000Khz d 10000Khz |
b 100Khz
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The Primary Radar Range is 300km. What is the maximum PRR?
a 500pps b 1000pps c 2000pps d 3000pps |
a 500pps
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In Loran C, the master is (i) __________ and the slave is (ii) ___________
a (i) directional (ii) omni directional b (i) omni directional (ii) omni directional c (i) omni directional (ii) directional d (i) directional (ii) directional |
b (i) omni directional (ii) omni directional
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The usual glidepath from horiazon
a 4 deg b 3 deg c 2 – 4 deg |
c 2 – 4 deg
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What is true of signal noise?
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increasing power to reduce noise
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A RMI shows a heading of 200deg. A tail of a pointer representing the overflown NDB reads
212deg. If the variation of the aircraft is 12W, the aircraft true outbound track from the NDB is a 12P b 24P c 12S d 24S |
c 12S
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What can a PAR provide?
i An instrument approach utilizing aircraft range and bearing ii An instrument approach utilizing aircraft height a Both b Neither c only d (ii) only |
a Both
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What is true about the height ring in AWR?
a absence means the AWR is always unserviceable b a second height ring may appear with equal brightness c at about 30000 feet, it will merge with the range markers |
c at about 30000 feet, it will merge with the range markers
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What is the time to impact if no action is taken after an alert warning from Mode1 and Mode2 in
GPWS? a 15s b 30s c 60s d 45s |
a 15s
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What is true of skywaves ?
i It is never used in Nav Aids ii It is limited to the MF & HF Bands only a 1 only b 2 only c both d neither |
d neither
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Transmitter power is 500 KW, whats is the VLF Range over sea?
a 3000 NM b 1000 NM c 2000 NM d 4000 NM |
c 2000 NM
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Which Frequency is used in Loran-C
a VHF b LF c VLF d MF |
b LF
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An AWR in Iso-echo mode showed a “Black Hole” in its return. Where is the area of highest
activity? a Black hole b Green area c Blue Area d Shallow Color gradient |
a Black hole
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What is VDF Transmission ?
a J3E b A8W c PON d A3E |
d A3E
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What is true of TCAS
a Can never be ignored b Gives only audio but no visual warning c TA gives a warning when intruder is within 20s d Can be inhibited in a Terminal Area |
d Can be inhibited in a Terminal Area
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what are the inputs to GPWS ?
a GlideSlope & Vertical Speed b Undercarriage and TAS c HDG & Drift d Flaps & AOA |
a GlideSlope & Vertical Speed
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What is VDF Transmission ?
a J3E b A8W c PON d A3E |
d A3E
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What is true of TCAS
a Can never be ignored b Gives only audio but no visual warning c TA gives a warning when intruder is within 20s d Can be inhibited in a Terminal Area |
d Can be inhibited in a Terminal Area
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what are the inputs to GPWS ?
a GlideSlope & Vertical Speed b Undercarriage and TAS c HDG & Drift d Flaps & AOA |
a GlideSlope & Vertical Speed
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What is true of DME ?
a A/C transmits twin pulses b It is an SHF Device |
a A/C transmits twin pulses
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VOR Protection range ensures
a static interference b It is free from interference from other VOR stations on the same frequency c Free from Night Effect |
b It is free from interference from other VOR stations on the same frequency
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Loran C Question. Distance from Master is 140nm and from slave is 60 nm. Which of the
following would fall along the same hyperbola ? a 100nm, 150 nm b 80, 160nm c 80, 140 nm d 60, 100 nm |
b 80, 160nm
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During a go around, which alert would be activated by a GPWS System ?
a WHOOP WHOOP PULL UP b TOO LOW, Terrain c Don’t Sink |
c Don’t Sink
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What is true of GPS ?
a it has 4 orbital planes b has 21 satellites c SA is 100m 95% of the times |
c SA is 100m 95% of the times
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What is true of Mode S ?
a Allows ATC to pass instructions to pilot b Allows pilot to call home when homesick c Requires Ident code before it can be used d Height increment in 100 ft |
d Height increment in 100 ft
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What is true of RNAV
a Cannot be used with INS b Sometimes uses only DMEs c Lowers ATC workflow d Always used point source aids |
b Sometimes uses only DMEs
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What is true of AWR ?
a Cosecant beam is only used in MAP Mode b Is always stabilized in roll & pitch c Indicates stratus clouds |
a Cosecant beam is only used in MAP Mode
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Normal ILS Glideslope
a 1-3 b 2-4 c 5-7 d 10-20 |
b 2-4
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Time between RA and collision in a TCAS System is
a 2-3s b 4-5s c 15-20s d 35-40s |
c 15-20s
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AWR uses a short wavelength
a to detect stratus clouds b to detect large water droplets |
b to detect large water droplets
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Which band has the highest diffraction ?
a MF b VHF c LF d HF |
c LF
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What is true of MLS ?
a uses SHF Gigahertz range b No transmission from A/C Needed c Coverage of 70 in Azimuth d Lesser channels than ILS |
a uses SHF Gigahertz range
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What is true of Radio Altimeter ?
a AM b FM c Phase comparision d Phase sensing |
b FM
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What is true of LORAN C
a It is a RHO RHO System b It uses phase comparison c It is a hyperbolic system |
c It is a hyperbolic system
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Skip distance of a skywave varies
a both diurnally and seasonally b diurnally but not seasonally c seasonally but not diurnally d not affected at all |
a both diurnally and seasonally
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When the DME is on search mode and no lock-on is made, the pulses per second ________, and
then, it ______ a decreases, remains constant b decreases, decreases further c remains constant, decreases d remains constant, increases |
a decreases, remains constant
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Attenuation in ionosphere is maximum at ______ frequency and at ______
a lower, midday b higher, midday c lower, midnight d higher, midnight |
a lower, midday
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What is true of the Airborne Weather Radar?
a can detect stratus at 10nm b can detect rain |
b can detect rain
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What is true about Loran C
a It is a Rho Rho system b Same frequency |
b Same frequency
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what is true abt Loran C
a Master transmit omidirectional, slave transmit directional b Slave transmit omidirectional, master transmit directional c Master and slave transmit omnidirectional d Master and slave transmit directional |
c Master and slave transmit omnidirectional
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what is true abt height ring in AWR?
a if the ht ring is absent, we must always assume the AWR is unserviceable b at 30000ft the ht ring might be absent due to the merging with range marker c the ht ring is double the a/c ht, is as bright as the first ring, … |
b at 30000ft the ht ring might be absent due to the merging with range marker
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what is true DVOR
a its more accurate than the VOR b it has 4 letter ident starting with ‘D’ |
a its more accurate than the VOR
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what is true of hyperbolic
a uses phase comparison b it measures the difference in range of 2 fixes |
b it measures the difference in range of 2 fixes
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What is true of AWR
a the hold function is use to monitor growth/decay of thunderstorm clouds b fan shape beam is only available in map and manual c is in EHF band d beam width can be 5 degree or less |
d beam width can be 5 degree or less
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ground radar at aerodromes are _________ and _____ detect aircraft height.
a stationary, can b stationary, cannot c rotating, can d rotating, cannot |
d rotating, cannot
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Which of these type require the tone function to be on
a NON A1A b NON A2A c Either NON A2A, or NON A1A d neither |
a NON A1A
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To minimize the coastal effect, use station _______ and _______.
a inland, 90 degree to the coast b nearer to the coast, ahead of aircraft c nearer to the coast, 90 degree to the coast d inland, ahead of aircraft |
c nearer to the coast, 90 degree to the coast
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What is true of DME?
a Free of scalloping error. b Both air and ground signals consist of an ident signal c Transponder uses same frequency for transmission and reception |
a Free of scalloping error.
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What is true of ILS localizer frequency lobes?
a Amplitude-modulated with HF frequency b Frequency-modulated with HF frequency c Amplitude-modulated with VHF frequency d Frequency-modulated with VHF frequency |
c Amplitude-modulated with VHF frequency
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VOR reference signal is a _______ and is identified by ________ ?
a Fixed cardioid, Phase comparison b Rotating cardioid, Freq comparison c Fixed cardioid, Freq comparison d Rotating cardioid, Phase comparison |
d Rotating cardioid, Phase comparison
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Given 500kw power, what is the range?
a 1000nm b 2000nm c 3000nm d 4000nm |
b 2000nm
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What is the MLS azimuth coverage?
a +/-40 degrees b +/-20 degrees c +/-80 degrees d +/-10 degrees |
a +/-40 degrees
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Given 3 KM minimum range. What is the PRI?
a 40μs b 10μs c 20μs d 5 μs |
c 20μs
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Which frequency gives the least skip distance during the night?
a 200khz b 1500khz c 15Mhz d 30Mhz |
a 200khz
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What is true of Loran C
i Global Coverage ii Use synchronous pulse transmission a I only b II only c Both d Neither |
d Neither
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What is true about Mode S?
a ATC can pass instructions on the uplink b It does not let ground to air communication without human involvement. c Data on the downlink is confined to responses to interrogation to the ground d Min height increment is 100ft |
d Min height increment is 100ft
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What is true about AWR
a On color CRT, greatest turbulence occurs on successive color separation widest b (WEA) should never be used on the ground c Hold function is to assess thunderstorm rate of growth/decay d Typical beamwidth is < 5 deg |
d Typical beamwidth is < 5 deg
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On receipt of warning of GPWS, immediate response is
a level wings and immediate climb b level wings and request for ATC clearance |
a level wings and immediate climb
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Mode 3 is activated at:
a 700’ radio altimeter b 500’ radio altimeter c 700’ barometric d 500’ barometric |
a 700’ radio altimeter
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Night effect affects NDBs:
a Up to 100nm b Up to 50nm c All ranges d Not affected |
a Up to 100nm
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Which band has the highest diffraction?
a MF b LF c VHF d HF |
b LF
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Statement about SSR. "An a/c carries _____ and operates on _____ band.
a Interrogator, UHF b Interrogator, EHF c Transponder, EHF d Transponder, UHF |
d Transponder, UHF
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Radio altimeter operating range?
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2000 or 2500 feet
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AWR height ring?
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Indicates serviceability in absence of clouds
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Least coastal error from NDB?
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Nearest to coast & bears 90 degrees
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For warning "Terrain Terrain" & "Too Low Terrain" taken reference to:
a 30° elliptical beam below the a/c b directly below the a/c c 30° beam forward with a dip of 75° d 30° x 60° elliptical beam below the a/c |
b directly below the a/c
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What is true of MLS?
a Uses SHF gigahertz range b No transmission from a/c needed c Coverage of 20 deg in azimuth |
a Uses SHF gigahertz range
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What is the approximate range of a 500kHz transmitter using surface wave?
a 1000 b 2000 c 3000 d 4000 |
b 2000
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What is true of Loran-C?
a Amplitude matching b Frequency matching c Phase comparison d Pulse technique |
d Pulse technique
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The purpose of the beat frequency oscillator in an ADF receiver is to:
a manufacture a signal within the ADF receiver which differs in frequency from the incoming signal by 1 or 2 khz b manufacture a signal within the ADF receiver which is identical in frequency to that of the incoming signal c improve the range of the system d minimize coastal refraction |
a manufacture a signal within the ADF receiver which differs in frequency from the incoming
signal by 1 or 2 khz |
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An a/c is following the ILS glidepath of 3.25º at an aerodrome where the outermarker is 4.5nm
from the ILS touchdown point. The a/c groundspeed is 140kts. The height of the a/c at the outer marker should be _____ and the rate of descent to maintain glidepath should be _____. a 1470ft, 750ft/min b 1550ft, 790ft/min c 1540ft, 980ft/min d d. 1660ft, 1010ft/min |
b 1550ft, 790ft/min
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Principle advantage of DVOR is
a effective range is increased b readout of range and bearing is obtained c site errors considerably reduced d transmitter frequency instability minimized |
c site errors considerably reduced
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A VOR should be used
a only within the published DOC, by day and by night b only within the published DOC which decreases by night c outside the DOC if required but only by day d at any range providing that the fail flag is not visible and that the needle appears to be steady |
a only within the published DOC, by day and by night
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The mod code used in ILS is _____ and a typical loc freq is _____
a A9W, 329.13 b A8W, 110.3 c A9W, 110.7 d A8W, 118.3 |
b A8W, 110.3
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VOR to a signal the directional strength of which is defined by a polar diagram which is known as
a _____ VOR uses the principle of _____ to determine bearing info. a stationary, limacon, phase comparison b stationary, cardiod, envelope matching c rotating, limacon, phase comparison d rotational, cardioid, envelope matching |
c rotating, limacon, phase comparison
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Outside the calibrated area of ILS coverage on approach side
a fail flag is shown b reverse or false course signal c still reliable signals on both channels d localizer only still reliable |
b reverse or false course signal
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VOR transmissions are given the designator _____ and are in the _____ band.
a J3E, UHF b A9W, VHF c A8W, VHF d A3A, UHF |
b A9W, VHF
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The middle marker of an ILS installation has an audible code which is:
a alternating dots and dashes at 400Hz b alternating dots and dashes at 1300Hz c alternating dots and dashes at 3000Hz d high pitch dots |
b alternating dots and dashes at 1300Hz
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VOR transmit
a 2 carrier waves, 1 of which is freq modulated and 1 which is amplitude modulated b 1 carrier wave, which his both freq and amp modulated c a surface wave which is freq modulated and a direct wave which is amp modulated d a surface wave which is amp modulated and a direct wave which is freq modulated |
b 1 carrier wave, which his both freq and amp modulated
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The freq difference between the signal transmitted by the DME in an a/c and the response
signal which is transmitted by the ground station is _____, and this difference ensure that the a/c DME receiver can’t lock on to _____. a 63 Ghz, grd reflected signals b 63Mhz, interrogation pulse trains from other a/c c 63Mhz, grd reflected signals d 6.3Mhz, interrogation pulse trains from other a/c |
c 63Mhz, grd reflected signals
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An a/c on a hdg of 135ºM shows an RMI reading of 090º wrt an NDB. No quadrantal error
corrector device is fitted onto the ADV aerial/receiver. Any quadrantal error which is affecting the accuracy of this brg is likely to be a of a max value b of a very low magnitude c zero, since quadrantal error affects only the RBI d zero, since quadrantal error affects only VOR |
a of a max value
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NDB’s operate:
a only in the LF band using surface waves only b in the MF band using skywave only c in both LF and MF bands using surface and skywaves d in both the MF and LF bands using surface waves only |
d in both the MF and LF bands using surface waves only
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Precipitation static will reduce effective range and accuracy of the ADF because
a ADF needle will tend to point towards heavy rain b NDB signal will refract as it passes through a rain laden atmosphere c NDB signal will be scattered by rain droplets d SNR reduces due to electromagnetic field which is produced when snow strikes s/c |
d SNR reduces due to electromagnetic field which is produced when snow strikes s/c
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Station interference is overcome in NDB/ADF systems by:
a selecting stations within the promulgated range by day or night b selecting stations within the promulgated range by day c selecting stations within the DOC area by day d selecting stations within the promulgated range by day and using LF stations by night |
b selecting stations within the promulgated range by day
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Fading of an NDB signal, together with a hunting ADF needle is indicative of
a mountain effect b quadrantal effect c thunderstorm effect d night effect |
d night effect
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The receiver of an airborne DME equipment is able to ‘lock-on’ to its own reply pulses because:
a the freq employed by each airborne DME transceiver is slightly different to that used by any other b a freq shift is employed at the transponder c the a/c receiver recognizes the unique pulse train which was transmitted from the a/c and duplicated by the transponder d the a/c receiver only accepts pulses which arrive at the a/c with precisely the same time interval between successive pulse pairs |
c the a/c receiver recognizes the unique pulse train which was transmitted from the a/c and
duplicated by the transponder |
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How does the ionosphere varies?
i With seasons. ii Diurnally. a I only. b II only. c Neither. d Both. |
d Both.
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For HF communication, a __________ frequency is used by night than by day and the skip
distance is lesser due to __________ ionization layer by day than by night. a Lower, lower b Lower, higher c Higher, lower d Higher, higher |
a Lower, lower
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What is true about GPWS?
a ………. b Its satellites has different orbital planes. c Its accuracy is 95% of the time 100m for military. d It has 12 satellites. |
b Its satellites has different orbital planes.
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MF is preferred over HF for NDB because:
a Ground wave is longer. b Sky wave is more stable. |
a Ground wave is longer.
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TCAS has visual warning for
a TA & RA b TA only c RA only d d. Neither |
a TA & RA
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AWR with a color CRT, increasing severity of the rain & turbulence are
a b Yellow - amber - black c Yellow - orange - red d Green - yellow – red |
d Green - yellow – red
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For a VLF with a power output of 500kHz. What is the surface wave range over sea?
a 1000nm b 2000nm c 8000nm d 4000nm |
b 2000nm
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For ILS glide slope, the glide slope is
a Always 3deg b Always 4deg c Between 2deg to 4deg d d. Between 3deg to 5deg |
c Between 2deg to 4deg
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The guidance for the use of AWR on the ground is
a It should never be switch on in any mode. b It can be operated in weather mode only. c It can be switch on in any mode. d d. It can be operated in mapping mode only |
b It can be operated in weather mode only.
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The items taken into account for NDB protection range is
i It should not be affected by night effect. ii It takes into account of the level of atmospheric static. a I only. b II only. c Terrain terrain d Both |
d Both
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What is the main difference between TCAS I and TCAS II?
a TCAS I shows only proximate traffic b TCAS I shows only TA and not RA c TCAS I shows both TA and RA |
b TCAS I shows only TA and not RA
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Which is true of the following about LORAN C:
a Total coverage around the world b Its transmitters uses pulse technique |
b Its transmitters uses pulse technique
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Which is true about VOR DOC
a To prevent interference with other stations b To prevent interference from distance stations on the same frequency c To prevent interference from sky waves from… d To prevent interference from sky waves from other stations |
b To prevent interference from distance stations on the same frequency
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Doppler equipment uses
a Pulse FM/CW b Pulse AM/CW c Pulse only |
a Pulse FM/CW
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What is true of mode S data link?
a It is fully compatible with current mode aircraft transponder b It only allow ground to air interrogation c It allows transfer of verbal messages from ATC to aircraft d It transfer weather messages from ground to aircraft on request |
d It transfer weather messages from ground to aircraft on request
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……… the ADF, VOR …….null point
a Like, have b Unlike, have c Like, does not have d Unlike, does not have |
d Unlike, does not have
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Which is true?
i Modulation can happen in any part of the cycle ii When 2 waves are on the same frequency, their amplitude is also the same a I only b II only c Neither d Both |
c Neither
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What is true of the hyperbolar system?
a it uses phase comparison only b it uses range difference comparison only c Both d none |
d none
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what is true of the GPS system?
a uses 2 frequencies between 1000 Mhz and 2000Mhz b Uses range and bearing to obtain a fix. c Both d none |
a uses 2 frequencies between 1000 Mhz and 2000Mhz
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What is true of MLS
a provides more channels than ILS b able to cater for steeps approaches c Both d none |
c Both
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What is the main difference between TCAS I and TCAS II?
a TCAS I shows only proximate traffic b TCAS I shows only TA and not RA c TCAS I shows both TA and RA |
b TCAS I shows only TA and not RA
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Which is true of the following about LORAN C:
a Total coverage around the world b Its transmitters pulse technique |
b Its transmitters pulse technique
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Which is true about VOR DOC
a To prevent interference with other stations b To prevent interference from distance stations on the same frequency c To prevent interference from sky waves from… d To prevent interference from sky waves from other stations |
b To prevent interference from distance stations on the same frequency
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.........
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:-)
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