Comms Questions Flashcards
1
Q
111.1Mhz is a
A
ILS frequency
2
Q
What is the time period for intial transmisision of a 406Mhz ELT?
A
.25s
3
Q
Aircraft takes off from a 500ft elevated run way to 9500ft what is the approx max range of VHF reception
A
120 nautical miles
VHF Altitude range
1.23*(sure root of altitude in feet)
4
Q
RNAV uses what arinc specification
A
Arinc 583
5
Q
ILS marker lamp colours are
A
Outer blue, middle amber, inner white
6
Q
A loop aerial has
A
2 null
7
Q
RVR minimum for a cat 1 approach is
A
800m
8
Q
A series tuned circuit is referred to as an ace prior circuit because
A
Current is maximum at resonance
9
Q
I’m a class c amplifier, the transistor conducts for
A
Part of the time
10
Q
For VHF communications freq range is
A
118 to 136 MHz with 25Khz spacing
11
Q
Attenuation along a Hf installation co-axial feeder is due to
A
Skin effect
12
Q
The effect of position feedback in an autopilot system ensures that the
A
Control surface returns to the beaut RAL position when the disturbance is corrected
13
Q
Single side Andes transmission is achieved by using
A
Balanced modulator and mechanical filters
14
Q
Glide slope transmitter operates on
A
UHF band
15
Q
BJF and UHF makes use of the
A
Space wave
16
Q
Audio sources for the CVR are
A
Captain, F/O, observer/ flight engineer and flight deck
17
Q
In an aircraft equipped with mode s the sqwak code is entered
A
By the control panel
18
Q
With radar range resolution the only possible way to discriminate separate echos is by
A
The difference in their delays is greater than the pulse width
19
Q
111.2Mhz is
A
VOR
20
Q
The function of the hi-Lo marker switch is to
A
Control the sensitivity of the receiver
21
Q
The signals on a aircraft loop aerial are reproduced in the adf rx by a device known as a
A
Goniometer
22
Q
Q-factor is a measure of
A
Voltage magnification in a series circuit
23
Q
VOR over station sensor is activated by
A
Radio rate
24
Q
I’m an amplifier the term stage gain means the
A
Gain of one stage only
25
The accelerometer output in a INS is
Interested twice to give distance
26
Typical output power of a VHF communication TX is
Between 25 & 40 watts
27
Decision height is the height at which a. Go around is initiatedif
Visual reference has not been established
28
As a transmitted frequency is reduced ionospheric penetration is
Reduced
29
A squelch circuit in a receiver operates the
Audio stage
30
When carrying out a VSWR check on a communication transmission system a satisfactory reading would be
2:1
31
Cockpit voice recorder provided a continuous recording of the last
30 minutes
32
A radars system is transmitted pulses are rated by
Average power
33
121.5 MHz is a
VHF frequency
34
112.1Mhz is
A VOR frequency
35
GPWS mode 2 needs
RA, rate of decent and aircraft configuration
36
Present position can be entered by the
FMS CDU
37
The azimuth angle found on the MLS system is
40 degrees
38
The vertical profile for MLS extends to
30 degrees
39
With the aircraft coupled to the flight director only when tracking of a VOR beacon
Radio deviation would be the only input
40
The glide path frequency is
Paired with the localiser frequency
41
Ok the glide path centreline the received signal is an efficient carrier modulated equally by each tone to a depth of
40%
42
Decca operates in the frequency range between
70-130khz
43
In an FD system using fixed angle capture the signal inputs are
Course error and radio deviation
44
In a FD system with a vertical gyro the signal from the VG
Opposes the heading error signal
45
If a transistor amplifier is biased to operate in class B conditions it is biased
At cut off
46
In ADF installations quadrantal error is maximum at
45 degrees
47
The VOR reference signal is
Frequency modulated
48
The rad alt signal is primarily used
Ok the final stages of approach down to touch down
49
I’m a low pass filter the attenuation band is at
Frequencies above the cut off frequency
50
The Jf band used for long distance communication has a
Wave length between 10 & 100 metres
51
The space wave
Pénétrâtes thé ionosphère and is lost into space
52
The phase of a modulator signal corresponds to the
Polarity of a DC input signal
53
If the I bar of an E and I pick off is out of datum position the
Direction of displacement gives the output phase sense.
54
A basic INS platform has
2 accelerometers and 3 gyros
55
The battery in an INS will provide emergency power for
15 minutes
56
The reference and variable signals of a VOR are compared for
Phase
57
The localiser output signals from the navigation receiver are
Polarity sensitive DC
58
If the input power to a 40 dB attenuator is 10 watt, the output power is
100mW
59
Bonding of aerials is
Normally carried out via the attachment bolts
60
Selcal may be used with
Both HF and VHF
61
The sensitivity of a radio receiver is
Normally expressed in microvolts or in decibels below 1V
62
The aircraft Selcal code is
Allocated by ARINC
63
Absorption of radio waves due to the ionosphere is the greatest in the
Day
64
The reflecting layers of the atmosphere rise to a high level during the
Night
65
A VHF receiver received signals by a
Space wave
66
If the length of a 1/2 wave dipole is decreased the resonant frequency is
Increased
67
Cat 2 RVR limits are,
800-400 metres
68
When flying through a VOR cone of confusion the signals used by the AFCS are
Course select error and drift angle
69
During an ILS landing the aircraft usually captures
The localiser before the glide slope
70
When would full scale deflection occur on the course pointer in a VOR
10 degrees of the beam
71
Precipitation static on a aircraft is due to
Flying through rain snow ice and dust
72
The carbon microphone
Requires an external voltage for its operation
73
To receive CW transmission which of the following is required
A beat frequency oscillator
74
The wheel height at which a go around must be initiated unless it has been visually assessed that is is satisfactory to continue the approach and landing in safety is known as the
Decision height
75
The runway visual range is obtained by
Multiple set of instruments at the side of the runway
76
The ICAO weather category 3A is
Operation down to and along the surface of the runway with RVR minima of 200m
77
A Dual FD system has
2 vertical gyros 2VHF receivers 2 compasses
78
When testing a FD in heading mode the signals needed are
Heading error and roll
79
To operate in RHO RHO navigation mode an installation must have
Two DME transponders
80
A one for deviation on the HSI is equivalent to a
75mV signal
81
A 1/4 section of transmission line terminated in a short circuit behaves as a
High impedance, reflector circuit
82
Typical impedance figuiers for a coaxial feeder are
45-75 ohms
83
The input impedance of a dipole is approximately
73 ohms if centre fed
84
The input impedance of a folded dipole is
292 ohms
85
I’m the glide slope mod (FD system) the signals used are
Pitch and glide slope deviation
86
The glide slope indication on the HSI and ADI has a typical value of
.35 degrees/dot
87
FD modes maybe
APPR, IAS and V/S
88
A marker beacon operates on a frequency of
75MHz
89
Radar range resolution is increased
Only with a increased PRF
90
ATC system transmissions are
Single channel simplex
91
The gain of a weather radar system is
Automatically set when altering the range selection
92
GNSS is made up of a network of satellites arranged
With 4 satellites in 6 orbital planes at 60 degrees
93
What is a negative outcome of using larger bandwidth or increased range resolution
Pulse energy is reduced
94
Radar receiver noise is proportional to its
Bandwidth
95
What factors determine the duty cycle of a radar system
Pulse width x PRF
96
The time taken for the return pulse of a radio altimeter is
The aircraft height and the time taken to transmit and receive plus the delay from the antenna cable length including any transceiver delay
97
The carrier frequency of an ILS marker transmitter is
75 MHz
98
A VOR RMI shows an aircraft on a heading of 030 degrees and the selected VOR radial to be 145 degrees. The relative bearing of the station is
115 degrees
99
When the INS is first switched on the following two actions must take place
Accelerometers levelled platform orientated to true north
100
When an aircraft overflies the localiser transmitter the signals received will be
In the same sense
101
Modulation is a process whereby
Intelligence is impressed in the carrier wave
102
HIRF protected areas are
Given special additional inspections to the normal airframe inspection program
103
If an antenna is horizontally polarised it’s plane of polarisation is
The same as it’s electrostatic field
104
A squelch circuit
Keeps the receiver audio off until an RF signal appears at the receiver input
105
The glide slope signal above the glide slope is
90 Hz amplitude modulated
106
The gain of an antenna is
A measure of its directional properties
107
To erase the tape of a CVR the following conditions must apply
Aircraft on the ground parking brake set
108
A IRS system consists of
No gimbals
109
A buffer amp on a transmitter is between
Local oscillator and modulator
110
A better radar range resolution is provided by
Short pulse duration
111
The fundamental decca frequency is approx
14.2 kHz
112
An aircraft in the localiser centreline received a signal equally modulated by each tone to a depth of
30%
113
The raw output of a the auto VOR is
Magnetic bearing information
114
A minimum distance over which communication at a given frequency can be established by means of the sky wave is known as
Skip distance
115
The ins system is Schuler tuned to prevent errors due to
Oscillations if the platform due to aircraft accelerations
116
The external inputs to an ins are
TAS and altitude
117
The radiation pattern of a VOR station will transmit bearings that are
Magnetic
118
The characteristic impedance of a transmission line is
Independent of length
119
To meet the requirements of HIRF protection gold film windscreens need
No additional protection measures
120
HF wire aerials should not be made of stainless steel because it has
High RF resistance
121
An aircraft transmitter has an output impedance of 50 ohms the correct matching for this transmitter would be
Feeder 50 ohms
Aerial 50 ohms
122
The ideal standing wave ratio in an antenna is
1:1
123
After VOR capture on a ground check, aileron movement will depend upon
Course select error, radio deviation and bank angle
124
The outputs from a balanced modulator are
LSB AND USB
125
FM systems are less affected by noise than AM systems because noise modulates the carrier in
Amplitude
126
The facility performance ILS intersect height is where the
Localiser and glide slope signals cross
127
Crosswind compensation in an FD system may be achieved using
An integrator
128
After go around in an FD system the following mode may be selected
HDG
129
The bandwidth of an antenna
Can be increased by using a matching sub
130
An interrupted carrier wave is referred to as
A1
131
A DME system gives
Slant distance
132
Radio altitude is annunciated by voice
Below 500ft
133
ATC mode c uses
Gilliam Gray code
134
The three transmitted omega frequencies are
10.2 kHz, 11.33 kHz and 13.6 kHz
135
An aircraft is due south of a VOR beacon and has 000 degrees set in the omni- bearing selector if the aircraft is heading 090 the time from indicator will show
To
136
The INS battery is used to
Start the system and run it in an emergency
137
The usable range of the ILs beam is
About 15 miles greater than the glide slope
138
Side tone can be derived from the transmitter
Power amplifier
139
A single side and transmitter is transmitting in the upper sideband the carrier frequency is 10Mhz the modulating frequency is 10 kHz the transmission will consist of
A single frequency of 10.010Mhz
140
The ground run monitor present information of
distance to go and ground speed
141
An aircraft at 40,000ft using vhf can communicate upto a distance of
260NM
142
A VOR ground station is referenced to
Magnetic north
143
A dipole for operation T 300 MHz would have a length of
500cm
144
When the heading knob is rotated ok the FD system it moves the rotor of a
Control transformer synchro
145
A class 3 fault reporting failure
Has no consequences on aircraft safety
146
How many gps satellites required to locate the aircraft’s position in 3 dimensions
4
147
With a magnetic indication of 000 easterly deviation would
Be added to the heading as easterly deviation is positive
148
A cvr installed on a helicopter first certified after 1st august 1999 with two engines with a max certified MtOW 3175KG must begin recording
As early as possible during the cockpit checks prior to engine start
149
A CVR is found to be unserviceable
Flights must not continue after 72 hours
150
A defective radôme would cause
Excessive ground clutter
151
A DGPS system installed on a aircraft requires
One ground station and 4 satellites
152
A DME system indicates aircraft
Slant range to the beacon
153
A DME is in auto standby when
The DME receives 300-400 pulses a second
154
A DME receives a ground transponder reply after 2472 micro seconds the slant range to the transponder is approximately
196nm
155
A Doppler radar antenna is moved
Automatically to track
156
A Doppler a VOR stations transmissions
Can be received and processed with a conventional VOR receiver
157
A flat plate antenna is a
Series of slots and wave guides
158
A force rebalance accelerometer in an in system has the acceleration force balanced by a
Linear force
159
A GNS satellite system transmissions are
Right hand circular
160
A GPS system is formed from
Space control user
161
A hyperbolic system is
LORAN C
162
A laser dither mechanism ensures that
Optical back scatter does not cause the contra rotating beams to lock together
163
A laser gyro output is
Directionally proportional to angular turning rate
164
A LORAN C transmission consists of
8 pulses each 270 microseconds long
165
A magnetron can be used as an
Oscillator or an amplifier
166
A mode S transponder utilises a
Logarithmic amplifier
167
A mode C transponder
Can be used by TCAS
168
A mode C transponder gives the following information
Altitude
169
A mode S equipped aircraft has its RA area breached by a mode A only equipped aircraft what warning does the mode S aircraft get
TA visual and aural traffic traffic
170
A mode S transponder makes a mode A/C only call, what is the length of the P2 pulse
.8us
171
A moving coil microphone needs
No power supply
172
A padder capacitor has most efficiency at
The lowest frequency of the L O
173
A poor oscillator in a receiver would cause
Poo channel selectively
174
A pulse repetition frequency of 1000 transmits for 2 microseconds the peak power is 1 kW the average power is
2 watts
175
À quartz crystal has the characteristics of a
High Q resonant circuit
176
A rad alt trip signal is
Switched DC
177
A rad alt in track mode is effective to
2500ft
178
A radar antenna is facing left on ground test if you move the vertical gyro to simulate a right bank the antenna
Will move down
179
A radar response takes 329 microseconds how far away is the target
25 miles
180
A radar pulse takes 308 microseconds to return wheat is the target distance
Approx 25 miles
181
A radio frequency of 16 MHz would be used for
HF comms
182
A radio signals chance of penetration of the ionosphere
Increase with frequency
183
A rain fall of 5mm/he is indicated on the WXR by a
Yellow colour
184
A received acars message is
Via the on vhf receiver
185
A receiver having an IF of 465 kHz is tuned to 1300KHz which of the following signals could interact with the LO second harmonics to produce a receiver output if no RF amplifier was used
3995KHz
186
A receiver in which selected signals of any frequency are converted to a single frequency is called a
Superhet receiver
187
A receiver with a high IF will successfully reject
The 2nd channel / image frequency
188
A receiver with a large bandwidth will have
Poor signal to noise ratio
189
A resistance-capacitor low pass filter will have
The output taken across the capacitor
190
A Schuler pendulum has a period of oscillation of
84.4 minutes
191
A secondary radar system receives reply signals from
Another transmitter
192
A SSR interrogation operates on
A frequency of 1030MHz and pulse spacing depending on mode of interrogation
193
A Selcal signal transmits
Two pair of tones one pair after another
194
A signal at 120 MHz frequency will normally propagate by means of
Space waves
195
A single side and transmission is equal to
Low level modulation
196
A strap down INS has
A solid state accelerometer system
197
A TCAS blade antenna is
Part of the atc transponder system
198
A transponder that is compatible for use with a TCAS system would be
Mode S
199
A triple rad alt installation isolation is carried out by
Differentiating the frequencies
200
A valid interrogation will
Disable the RX, enable the encoder and disable the DME
201
A VHF comm blade aerial has a length of
A quatre wave length
202
A TCAS blade antenna is
An L-Band omnidirectionnel array
203
A whip antenna uses
1/4 wave
204
Above the glide slope the ILS glide slope signal modulation is
90Hz
205
ACARs is
A way of reporting defects to maintenance base in flight
206
ACARs is primarily used for communicating with
Maintenance base
207
ACARs is used to transmit
Both in flight and on the ground
208
ACARs sends information from base to the aircraft via
The printer
209
ACARs system operates in the frequency range of
131.550MHz
210
ACARs transmits it’s data using
Binary code
211
Accuracy if a GPS system used in aircraft navigation systems is
16 metres or less
212
Adding 6ft of cable to both TC and RX aerials on a rad alt would give you
18ft error
213
ADF is
Theta
(Angle only)
214
ADF operates within which frequencies
200 - 1000KHz
215
ADF operation range is at
MF band
216
ADF system sense aerial is
Null cardiod
217
ADF works by using
Both loop and sense aerial
218
Aerial masts maybe be damaged by
Skydrol hydraulic fluids
219
Aerials provide optimum output at one particular frequency when it’s load is purely
Resistive
220
After flying through the cone of confusion
Signal alters and the instrument indicates from
221
After passing the cone of confusion of a VOR
The phase difference reverses
222
Aircraft is 9000ft when is out of VHF range?
120NM
223
Aircraft north of VOR beacon on a course of 090 RMI the pointer points to?
180
224
Alert and decision height differ in that
The alert height is based on ILS equipment and decision height is based on the RVR
225
Alert height is
Where a decision of whether to land is made based on aircraft characteristics and it’s fail operational landing system
226
Align light flashes during alignment of an INS
It is attracting the operators attention
227
An o ring in a wave guide is used to
Stop moisture entering the wave guide
228
An accelerometer has
High inertia, restrained
229
An accelerometer in an ONS must be able to detect accelerations down to
10-6 g
230
An ADF system includes
Both a sense and loop antenna
231
An adjustment of the laser beam inside a laser gyro IRU
Can be done by adjusting the servo mirror
232
An aerial can be broadbanded by
Using a stub
233
An aircraft equipped with Mode A transponder only, enter airspace of a TCaS 2 aircraft. What indication does the pilot of the TCAS 2 aircraft get
TA after ranging
234
An aircraft flying on a heading of 030 receives an ADF signal 030 relative to the aircraft what is the ADF pointer indicating
060
235
An aircraft is on course on an IlS localiser what is the difference in depth of modulation (DDM)
Zero
236
An aircraft receives response from a DME station, 1236 microseconds after transmitting the interrogation. What is the slant range to the station
96 nm
R=(T-50)/12.359
237
An aircraft with 8.33kHz separation vhf communication system communicates using
Single channel simplex
238
An autoland can operate without an autothrottle if
The control of the speed does not create excessive pilot workload
239
An electromagnetic microphone requires which type of input
None
240
An FM signal would have its side and signals
No sideband present
241
An hf coupling is used to match the
Aerial
242
An I F amplifier unit consists of four amplifiers the amplifiers are normally coupled by
Transformer coupling
243
An ILS back bean approach uses
No glide slope
244
An IN system requires data from the
Air data computer
245
A IN unit uses pin programming for
Location
246
An IRS alignment
Takes 10 minutes and present position can be entered anytime during the alignment
247
An IRS cannot calculate
Local longitude
248
An isotropic radiator
Has a perfectly spherical radiation pattern
249
An over station sensor OSS detects
The rapid rate of the VOR signal over the cone of confusion
250
An OSS is triggered by
Rate of change of radio deviation
251
An RMI in VOR mode, it’s pointer is showing a course 000, if the course knob is adjusted to 010 what happens to the pointer
It will not move
252
Anti cross-talk network for unwanted signals use
Attenuation first the amplification
253
ARINC 629 operates at what speed
2000Kb/s
254
At its resonant frequency a parallel tuned circuit
Has maximum circulating currents
255
At its resonance frequency a parallel tuned circuit has
Maximum impedance
256
At resonance in a series tuned circuit the impedance is
Low
257
ATC altitude read out is
Series transmitted with binary encoding
258
ATC transponder uses what frequency band?
UHF
259
ATCRBS reply pulses are
0.45us wide
260
Attenuation in a coaxial cable
Increases with frequency increase
261
Attenuation of ground waves
Increases with frequency
262
Audio frequency range is
20-20,000Hz
263
Audio select panel voice switch
Allows Nav and ADF through
264
Back bean is captured
By manually selecting the back beam mode
265
In MLS the 12 but preamble consists of
5 bits time function and carrier and 7 bits function
266
Bandwidth of HF transmission is
3kHz
267
Before processing an AM USB signal, what needs to be done
Carrier added
268
Before the aeroplane is moved from the loading pier, the pilot must
Insert the latitude and longitude of the pier into the INS
269
Before the SSB is demodulated
The carrier wave is reinserted
270
Carbon microphones require
DC supply
271
Centripetal error compensation is achieved by
An additional signal is added to the N/S accelerometer to cancel the centripetal error
272
Channel 3 on a CVR records
Flight deck
273
Coaxial transmission line of impedance 80 ohms is connected to a dipole of 120 ohms. While checking with an ohmmeter the reading will be
More than 20 megaohms
274
Communication between the aircraft earth station and the satellite is on
L band
275
Confirmation of the correct operation of an ATC transponder ident function is verified by
Use of a ramp test set
276
CDU selection of TKE displays
Difference in degrés that the aircraft track is to the right or left of the desired track
277
Coriolis effect is corrected for by
Adding a correction term to the accelerometer outputs
278
Crystals operate reliably at fundamental frequencies up to
30MHz
279
CVR is unserviceable
The aircraft can fly for 72 hours since unserviceability
280
Data communication between the aircraft and the operational control centre is possible through
ACARs system
281
Decca navigation usés
LF
282
Delayed automatic gain control is inop, the sensitively of the receiver will
Increase for the high voltage signals
283
DFDR arinc 573 data bud has how many subframes
4
284
Differential GPS requires
4 satellites and 1 ground based transmitter
285
Direction property is exhibited by
The loop antenna
286
DME compares what for measurement of slant distance
Pulse transmission and return echo
287
DME interrogation is carried out
63MHz above or below transmitted frequency
288
DME reply pulses are 63 MHz
Higher or lower
289
DME squatter comes from
DME station
290
DME transponder transmits on receipt
Of a pair of pulses separated by 12 microseconds
291
DME uses which frequency band
UHF
292
Doppler flag comes on when it receives
No signal
293
Doppler navigation uses
No ground based equipment
294
Doppler VOR, when received by a conventional VOR receiver
Has normal reception with an ident signal
295
DSR TK means
A great circle path on surface of earth connecting two way points
296
During ACARs transmission a 1 is generated by
A 2400 Hz waveform
297
During ATC transponder operation suppression acts to
Mute the DME operation during the transmit phase
298
During initialisation ins used to calculate local vertical
Accelerometers only
299
During operation of a twin HF radio system transceiver
No 1 hf system operation is inhibited during no 2 operation
300
During testing of ATC altitude function the pressure altimeter is set
1013.25mb
301
Earth rate is approx
15 degrees an hour
302
Emergency frequency is
121.500 MHz
303
EPR and speed for autothrottle is activated at
Take off
304
Flight director on GS capture the pitch Integration is to
Decrease GS error signal
305
Flight director on VOR, course error wash out signal is lost when following the FD commands aircraft will
Follow the course with scalloping or bracketing
306
Flight management control system utilises
ILS, DME, ADC
307
FM improvements affect what system
VHF, VOR, ILS
308
FMC changes movement via
Flight control computer
309
FMC mode that can be selected through the CDU is
CRZ
310
FMC provides data envelope for
GPWS
311
FMC secondary flight plan is selected
In the air by the pilot
312
FMCS outputs to
GPWS
313
For radio communication over a distance of over 250nm we use
HF
314
For INS the battery unit provides standby power
Both when airborne and on the ground
315
Frequencies used for MLS are
5-5.1 GHz
316
Frequency modulation used for transmission of audio signals is best suited to
Short range transmissions
317
From where is bearing information received for display on the digital distance radio magnetic indicator
From VOR and ADF systems
318
Full scale deflection of the glide slope pointer from the centreline is
.7 degrees
319
Full scale deflection on a VOR system is
10 degrees
320
Function of ADF VOR and DME in navigation system with reference to aircraft and beacon is
The first provides bearing line from aircraft to beacon and latter provides distance between aircraft and beacon
321
Glide slope deviation signals are
SC polarity sensitive
322
Glide slope frequency is
328.6 - 335.4 MHz
323
GNSS is
Any satellite system that provides autonomous geospatial positioning with global coverage
324
GPS
Uses 24 satellites equally spaced around 6 orbits
325
GPS antenna is
Circular polarised
326
GPS consists of 24 orbiting satellites located
I’m a 10900 nm high orbit
327
GPS frequency is
1575 MHz
328
GPS has
4 satellites in each of 6 orbits
329
Gos L1 and L2 signals are
Biphasé 50 bit/sec
330
GPS receiver navigation message frequency is
50 Hz
331
How sends L1 and L2. What is on L1?
C/à code and p code
332
GPS telemetry consists of
Satellite position Information
333
GPS works on the principle of
Information received from satellites is cross referenced against other signals received to calculate position
334
GPWS will show a fault if the following fails
Radio altimeter
335
Group countdown in a transponder receiver changed the
Sensitivity
336
HF aerials have weak points designed at
The back end
337
HF communication frequency is in the range
3-30MHz
338
HF transmission of 10 MHz with a sideband of 1000 Hz which drifts 50 Hz the received audio tone would be
1000Hz
339
How many bits make up the Mode S address
24
340
High range resolution is obtained by
Shorter pulse width
341
How can it be verified if FMC updates is correct
FMC via CDU
342
How does a receiver know whether an ILS or a VOR frequency has been selected
Logic control circuit in the control unit
343
How does an aircraft distinguish its own DME equipment reply from this for other aircraft
By changing at random the time delay between the pulse pairs of the interrogation signal
344
How does irs calculate velocity
Integration of accelerometers
345
How does the flight director computer differentiate between VOR and ILS frequencies
Frequency discriminator in receiver
346
How is a DME station identified
Morse
347
How is the flight deck informed of an acars transmission
Double chime
348
How is the next database on the FMC activated
Manually on the ground
349
How is the glide slope frequency chosen on the nav control panel
It isn’t manually chosen it is paired with the localiser frequency
350
How long does the gps éphémères collection take?
30 seconds
351
How long is the time between the start of the P1 pulse and the P3 pulse for a mode A transmission ignoring the P2 pulse length
8 micro seconds
352
How long is the time beteeen the start of P1 pulse and the P3 pulse of a mode C transmission ignorning p2 pulse length
21 microseconds
353
How many aerials are there in a TCAS system
2
354
How many databases are required in an FMS system
2
355
How many programs can a FMC store
2 one active one standby
356
How many satellites are required for GNS
4
357
How many satellites compromise the space segment for GPS
4 satellites in each of six orbits
358
How many times does the ins integrate the acceleration signal it receives from the accelerometers to get the distance the aircraft has flown
Twice
359
How would you increase radar target range
Low PRF, high scan and long pulse duration
360
Hyperbolic navigation uses the principle of
Time difference or phase difference between two radio signals depending on which type is used
361
If a ground station interrogating an aircraft transmits P1, P2 and p6 through the rotating beam antenna and P5 is radiated by omnidirectional antenna, which mode is it addressing
Mode S only
362
If a VOR RMI indicates 000, and the course selected is 000 what will the to/from indicator display
To
363
If an 80ohm coaxial cable is connected to an 80 ohm dipole aerial resistance would be
80 ohms
364
If an aircraft is east of VOR beacon the reference and variable phases are
Phase quadrature
365
If an aircraft is flying on a heading of 000 away from a VOR station the to/from indicator would show
From
366
If an FM signal is modulated by an audio signal the frequency of the audio would relate to the
Rate of the frequency change
367
If faded totally fails the pilot will get
A light illumination on the fadec control panel
368
If one FMS fails in a dual system
FMS CDU on fail side goes blank
369
If one FMS fails in flight
The standby FMS takes over
370
If radar pulse is reduced there is
Reduced relative range
371
If the 90 Hz tone predominates in a localiser receiver the deviation indicator will show
Fly right
372
If the ADF cable is to long
Secure and stow excess cable
373
If the battery fails on a in’s system in the ground
An amber light appears on the MSU and a horn sounds
374
I’d the inductance in a parallel tuned circuit is increased in value the resonant frequency
Decreases
375
If the runway picture I’m the EADI moves down during an ILS approach the aircraft must fly
Down
376
If the VOR track error is 2 dots how many degrees off track is the aircraft
10 degrees
377
If two aircraft decide to issue the same RA for a potential conflict which aircraft changes the decision
The one with the higher address
378
If you carry out a VSWR check of a SSB HF system what should you do with the control switch? Select it to
AM
379
ILS and VOR operates in which range
VHF
380
ILS marker beacon lights are
Blue, amber, white
381
In a colour wxr AGV is set
Automatically on receiver noise level
382
In a CVR system hot mics
Is a term applied to all the aircraft’s mics
383
In a DME system how does the receiver fine the recorded pulse pairs are valid
Decoder
384
In a Doppler system the frequency return of the forward beam will only match the rearward beam
During level flight
385
In a Doppler VOR the 30Hz reference signal is
AM modulated
386
I’m a dual FMS a failure of one computer will result in
No effect on the CDU
387
I’m a gimbal system the stable platform is the
Azimuth gimbal
388
I’m a gps system what type of clock is in the receiver
Quartz
389
I’m a ground wave which plane of polarisation suffers the greatest attenuation
Horizontal plane
390
Ina large transport aircraft to check VSWR of a HF system with a long aerial feeder the VSWR meter has to be connected
Between the transmitter and the ATU (ATU End)
391
In a loran nav system master station transmitter frequency
The same as the slave
392
Ok a modern aircraft the acars system is used primarily for
Comme between the aircraft and base
393
In a rad alt system if you decide to increase the tx cable and rx cable each by 3” the total correction factor is
9”
394
In a secondary radar system at what frequency does the interrogator transmit on
1030MHz
395
In a superhet receiver the advantage of an RF amplifier is
It improves signal to nose ratio
396
Ina triple rad alt installation on a large aircraft interference is prevented by
Varying the modulating frequency of each system
397
In a universal all call transponder interrogation P2 is indicated by the
Omnidirectional antenna
398
In a vertically polarised electromagnetic wave
The electric field vectors are vertical
399
I’m ACARs in an upcoming message is received
A chime sounds in the cockpit
400
I’m ADF quadrature error are eliminated by placing attenuators
Across loop aerial
401
I’m an ADF system the goniomètre
Effectively simulates a rotating loop antenna
402
In a VOR receiver
30Hz modulated reference signal is compared with 30Hz variable phase signal
403
I’m a AM wave the intelligence is contained in the
Sideband only
404
In a analogue radar what’s is the purpose of a balanced mixer
To improve noise reduction factor
405
In a autopilot A.C analogue computer VOR deviation signals before integration with course error signals are
Modulated
406
In an In system the output of the accelerometer is linear because of a
Force balance system
407
I’m a IN system the purpose of the stable platform is to
Prevent unwanted acceleration affecting the accelerometers
408
In an INS system the accelerometer is a mass
Suspended between two springs in a tube
409
I’m a interrogator mode S addressing format when does the first synch phase reversal occur
2.75u seconds after P2
410
In an IRS system you would expect to find
Ring laser gyros
411
I’m an IRS system the accelerometer is double inter grated for
Distance
412
I’m sera navigation a line of constant bearing would be define as
Rhumb line
413
In audio clipping
Vowels are attenuated relative to the remaining signal
414
In CVOR 9960 c/s AM subcarier is used in the
REF phase
415
In Doppler radar with a moving aerial the aerial
Turns automatically to match the aircraft track
416
In flight mode the FMS preference data source is
IRS, RHO-RHO, RHO-Theta
417
In ground mode the FMS uses which of the following for velocity calculations
IRS
418
In ILS the glide slope provides
Vertical steering
419
I’m INS vertical acceleration is calculated by
An accelerometer
420
I’m LNAV mode
The pilot can change heading from the MCP
421
I’m MLS what is the beam angle away from runway
15 degrees
422
I’m regard to the aircraft transponder what is the pulse frequency
Amount of times reply signal is sent per second
423
I’m the downlink DF11 format a .5 microsecond pulse in the first half of the slot represents
A logic one
424
I’m the LORAN nav system the master station frequency in relation to the slave frequency is
The same
425
I’m the OBMS the printing report system is activated
Either manually or automatically
426
In VHF comms with 8.33 kHz spacing how many channels are used
2280
427
I’m VOR the manual phase shift resolver is a
30Hz signal
428
In weather radar short range targets are missed by
Larger pulse width
429
In what frequency range does the ADF system operate
190 - 1759 KHz
430
In what type of Doppler system do altitude holes appear
FM and pulse
431
In yagi array antenna the signal is fed through a cable to
Dipole
432
Incompatible FD modes are
Altitude hold and ILS
433
Increasing the bandwidth of a radar receiver
Has no affect on pulse shape but increases noise
434
INS has mercury switches on
All gimbals
435
INS power is provided by
AC normal
DC emergency
436
INS wind speed is calculated from
The vectorial addition of TAS and GS
437
IRS obtains basic position information by
Inter grating twice the accelerometer output
438
IRS serviceability for in service drift is ascertained by
3+3t
439
Janus in Doppler radar
Adjusts for lateral and vertical steering
440
Janus operation is used
For better coverage
441
L band DME transmits on a frequency of
1090 MHz
442
Laser gyros
Do not have rotational parts
443
Laser gyros are
Aligned to the aircraft structure
444
Laser gyros have
Moving parts
445
LOC modulation is
20%
446
Localiser beam width is the angle where the two edges of beam are apart at the runway threshold by
700ft
447
Localiser modulation depth is
20%
448
LORAN C uses
100KHz
449
Man made noise causes interference
Mainly below 12 MHz
450
Marker beacon receivers have
No control unit as the unit typically turns on when the avionics master switch is activated
451
Marker information is usually provided to the pilot
Both visually and aurally
452
Maximum power on a wave guide is governed by the
Narrowest width
453
MLS elevation coverage is
15 degrees
454
MLS operates on what frequency
5031-5090.7 MHz
455
MLS are modulated with
Phase shift keying
456
Mode 4 of GPWS derives warnings from
Rad alt decrease
457
Mode C response is
20.3 microseconds
458
Mode S pulses which are used
S1 p1 p3 p4
459
Mode S transponders transmits a binary code of
24 bits
460
Most aerials are
Bonded
461
Most radio aerial masts are
Bonded
462
Omega ground station transmits
Pulses of CW
463
On a back bean approach which error signal would not be used
Glide slope
464
On a fibreglass aerial what paint should be used
Not cellulose
465
On a WX radar display the time base is a
Trapezoidal wave form
466
On an aircraft comm system HIRF interference is most prominent
At specific frequencies
467
On an FMCS CDU you can select
N1 thrust
468
On an HF radio set the clarifier control is used
To adjust the reinserted carrier due to instability in the RX
469
On a ILS approach what will cause the aircraft to fly onto the beam
Radio deviation
470
On a RMI the input to the ADF pointer is fed via
A synchro
471
On power up the IRS obtains position
Longitude from last position
472
Ok TCAS with own aircraft below 1750ft
Any other aircraft below 360ft are deemed to be on the ground
473
I’m the ASP how many RX and TX can be selected at any one time
Multiple RX and only one TX
474
Ok the ATC radios readability scale what is satisfactory reception
5
475
Outer marker frequency is
400 HZ
476
Overshoot or go around mode can be Initiated
After glideslope capture
477
Peak power is 10 kW pulse period 6us and duty cycle is 2.4ms. What is the average power transmitted
25w
478
Pin programming is allowed
To provide reference to FMS computer as to which side of datum it is fitted to
479
Precipitation static is caused by
Skin to air particle collisions
480
Rad alt failure effects which system
GPWS
481
Radar resolution is the ability to determine between
Two targets in close proximity to each other
482
Radiated interference of current carrying cable can be minimised by
Putting the affected cable in a single conduit
483
Rad alt normally indicates the altitude of
0-2500ft above ground level
484
Radio switches are normally
Spring on R/T latched on I/C
485
Radio waves are said to have mine of sight propagation
Above about 100MHz
486
Random precision of the inner gimbal ring is detected by placing mercury switches
On inner gimbal ring
487
Range resolution in a radar system is improved by
Shorter pulse
488
Restrictions to the use of hand held mics apply to
Transport category aircraft only
489
RMI in ADF mode the pointer is moved by a
Loop voltage
490
RNAV accuracy is
+_ 5nm 95%
491
RNAV system uses
VOR gps
492
RNAV uses which inputs
IRS
VOR
GPS
DME
493
Satcom carrier signals suffer from a Doppler shift of frequency due to the
Velocity of the aircraft with respect to the satellite
494
Satellite transmits updates on every
2nd orbit
495
Second Chanel Mmmm interference could occur if the IP frequency was at twice the
I F and on the opposite side of the local oscillator frequency
496
Selcal is used to
Monitor ground signals
497
Selection of the INS mode selector unit to ATT REF is made
When navigation information is lost
498
Short duration radar pulses
Allow echoes from short range
499
Single side band filters are
3kHz
500
Slewing of the INS gimballed platform simulates in flight attitude changes up to
71 degrees in pitch and 180 degrees in azimuth
501
Sonar location beacons are a
ICAO requirement
502
Standing waves in a coaxial feeder cable are proportional to
Degree of mismatch between transmitter and antenna
503
Suppressor line is required for
All L band equipments including TCAS
504
TCAS considers another aircraft to be on the ground at a difference height between the barometric altimeter and rad alt of
180 ft
505
TCAS transmits squirted pulses on a frequency of
1090 MHz
506
TCAS antenna is a
Directional antenna
507
TCAS 2 is
24 aircraft per 5nm radius
508
TCAS is selected
By a switch by pilot on selector panel
509
TCAS transmits interrogations and receives replies on a frequency of
1030 MHz & 1090 MHz respectively
510
TCAS will issue a TA if
A collision is within 35-40 seconds of occurring
511
The aerial element of a vhf comms transmitter / receiver should have a mid band length of
N/4
512
The aircraft equipment determines the bearing of a ground station by comparing
The phase of two 30Hz modulations
513
The aircraft is due north of the VOR station on a heading of 90 what is the RMI displaying
180 degrees
514
The alignment position of an IR mode selector unit enables
Gyro run up, levelling azimuth determination
515
The anti skid armed signal comes from
A switch in the cockpit
516
The approximate distances of the middle marker from the runway threshold is
3500ft
517
ACARs uses which frequency band
VHF
518
ATC antenna has a polar diagram which is
Directional
519
The ASP allows crew to
Transmit on one channel listen on multiple
520
Auto gain voltage of a weather radar is set
By the manufacture
521
Autopilot disconnect indications are
Flashing master warning light and an aural
522
Aviation distress frequency is
121.5MHz
523
The bearing of a NDB measured by ADF is 060 relative to aircraft heading of 030. The RMi pointer indicates
90
524
The components of an ILS system are
A localiser glideslope and Marker beacons
525
The correct sense demand generated for a selected heading 180 when the aircraft heading is 150 is
Turn right
526
The crab angle of the aircraft during VOR or LOC modes is displayed by the
Difference between the course arrow and aircraft heading
527
The crew select DH on
The rad alt display
528
The delete tone button on a VOR/ILS test set is for
Testing correct operation of the flags
529
The distance over which VHF comms may be achieved is limited
To radio line of sight
530
The Doppler VOR beacon reference signal
Solitude modulâtes the carrier frequency
531
The DVOR is preferred in comparison to CVOR because
DVOr is relatively insensitive to site errors
532
The electrical tuning unit of an Hf transmitter maintains a VSWR of the antenna at
1.3 - 1
533
The FFR ULB operates at a frequency of 37kHZ
With an operational time of at least thirty days
534
The flight director is on a localiser when the radio deviation signal is lost the aircraft would
Fly parallel to the localiser
535
The FMS navigation database is updated
Every 28 days
536
The frequency of 111.1MHz is used by
ILS localiser
537
The frequency of a glideslope transmitter is
328.6 to 335.4MHz
538
The frequency range 300KHz - 3MHz is called the
MF band
539
The frequency spectrum of noise is
Infinitely wide
540
The fundamental theory of operation of a ranging radar is
Time take to receive returns
541
The general function of the ATC transponder is to
Reply with an identification signal after being interrogated by a ground station
542
The glide slope and localiser frequencies
Are paired and one frequency sleeve for suffices both
543
The glide slope equipment operates in the
uHF band
544
The glide slope in an ILS provides
Vertical references
545
The glide slope system offers approach guidance to the runway in terms of
The vertical plane
546
Glideslope transmitter is located
Adjacent to the touch down point of the runway
547
GPS provides location and time information when there is unobstructed line of site to
4 or more satellites
548
GPS satellite system consists of
21 satellites and 3 standby satellites
549
Ground run monitor presents
Ground speed and distance to go
550
The heading error signal used in the heading select mode
Is the difference between the desired heading and the actual heading
551
The horizontal angle contained between the true and magnetic meridian at any place is
Declination
552
The image channel ratio is
Response at wanted channel frequency over response at image channel frequency
553
The impedance of an hf aerial is
50 ohms
554
INS computes distance from acceleration by
two successive integrations
555
The input data for the RNAV system comes from
Existing systems within the aircraft and dedicated rnav transmitters
556
The ins platform is
Always parallel relative to the earth surface
557
The IRS laser gyros is a
Rate gyro
558
Janus beam is for
To compensate for attitude changes
559
Laser ring gyro
Does not have a gimbal
560
The length of a resonant antenna dipole is
Lambda/2
561
Localiser deviation signal for the flight director comes from the
VHF nav System
562
Localiser looks after
Horizontal plane
563
The loop aerial polar diagram is a
Figure 8
564
The manual input for the VOR course corrector is related to
The C.D.I. offset bar
565
Middle marker beacon is
Amber
566
Middle marker modulation is keyed with
Alternate dots and dashes
567
MLS frequency band is
C
568
Mode S squirted pulse will
Contain aircraft identity
569
Mono pulse aerial system is used to provide TCAS with
Bearing information
570
Most common type of gyro used in ins is
Single rate integrating gyro with viscosity damping
571
Most sensitive system between ils and VOR is
ILS
572
Noise factor of a receiver whose I/P signal to noise ratio is 15:1 and O/P signal to noise ratio is 12:1 is
1.25
573
Number of different radials provided by a ground station is
Infinite
574
Number of VHF frequency channels is
760
575
Output of an ins can be fed to
Attitude indicators
576
The path of a point which moves such that the difference in a distance from two fixed points is equal is called
Hyperbola
577
Plane of polarisation is defined as the plane in which the
E field lies
578
Polled mode in a acars
Operates only when interrograted by the ground facility
579
Polythene coating on an hf antenna wire is provided
To prevent precipitation static build up
580
Polythene sleeping over a hf antenna is to stop
Precipitation static
581
Preferred location of a VOR antenna in light aircraft is on
Top of the vertical stabiliser
582
The pulse reputation frequency should be
Low for long ranges
583
Quadrantal error in ADF is maximum at a heading of
045
584
Rad alt electrical length for a helicopter of cable length 18ft is
28ft
585
The radar is set to long pulse bursts this will have the effect of
Missing close echo returns
586
The range at which the STC waveform ends is proportional to
Pulse width
587
The rate of G/S warning I’m GPWS
Changes with radio altitude
588
The RF resistance of an inductor
Increases as frequency increases
589
The short circuit stub that is used for B-road banding a VHF whip antenna for frequency of 127MHz must have a length of about
59cm
590
The stability of an effort oscillator can be improved by
A buffer amplifier
591
The system which will be inhibited during a radio altimeter self test is the
GPWS
592
The term oblate spheroid refers to
flattening at the polar regions
593
The term HIrF
High intensity radiated fields
594
The three accelerometers on a stable platform are mounted
Orthogonally
595
The three accelerometers on a strap down platform are mounted
90 degrees to each other
596
Tone frequencies for glide slope and localiser are
90 and 150 Hz
597
The transmission lines normally used between a radio antenna and its transceiver equipment is
Coaxial cable
598
The type of gyro generally used in an IN system is a
Rate integrating gyro
599
The uplink 11 format uses
Differential phase key shifting
600
The VHF aerial resistance and transmission line resistance is
50 ohms
601
The voice switch on the ASP has a
1020KHz band stop filter
602
The VOR system compromises
Variable and reference phase signals
603
The VSWR of a VHF system with a forward power of 100W and a reflected power of 4W will be
1.5:1
604
There are two FMS in an aircraft which are
Master and slave
605
There are two FMS installed on the aircraft if one fails during flight
The failed FMS has a blank screen
606
Three RF amplifiers of 10 dB and 10KHz are in cascade what is the output
30dB and 10KHz
607
Time base of PPI display is
A trapezoid
608
To carry out a database update ok the FMS
Use the database loader
609
To check side lobe suppression
Use a ramp test set
610
To improve the image or picture when using the WXR
Use shorter bursts
611
To know the valid database on the FMS
Call up the relevant CDU page
612
To make a passenger announcement from the flight deck
Set the asp to PA and transmit from the control column
613
To minimise cross cable interference
Run radiating and affected cables as separate bundles
614
To obtain an accurate GPS fis the GPS receiver must be in line of sight of
4 satellites
615
To prevent gimbal lock on the stable platform is is normal to use
4 gimbals
616
Track error is the difference between
Actual track and desired track
617
Track mode of an rad alt is operational
From 0 - 2500ft
618
Transmission line losses have what effect on VSWR
Do not affect
619
Transmitter aerial radiates
Electrostatic and electromagnetic energy
620
Transport rate compensation is achieved by
The platform being torqued by a computed torquing signal
621
Tx output stages are normally run in class c
Because the efficiency is high
622
Types of very low frequency navigation include
Decca oméga
623
Use of a diplexer in a receiver is
To enable signals to be distributed to different receivers
624
Using INs an aircraft flies
Great arc circle
625
VHF air and frequency range is
108-136MHz
626
VHF antenna length is based on
Quatre wavelength
627
VHF frequency is
30-300MHz
628
VHF transmitter output impedance to match with antenna for maximum power transfer is
50 ohms
629
Voice clipping
Decreases the depth of modulation of high amplitude voice signals
630
Voice selected from the voice range switch on the ACP acts as a
1020Hz band stop filter
631
Voice/range switch selected to range
Allows nav/adf and DME through and cancels out voice spectrum
632
Voltage buffer amplifiers are used when
An impedance change high to low is required
633
VOR capture can be determined by
A predetermined level of the VOR deviation signal away from the selected radial
634
VOR left right deviation signals come from the
VHF nav set
635
VOR washout signal is by
An integrating circuit
636
Wave length of X band radar is
3cm
637
What are the shapes of traffic shown on a TCAS display
White diamonds, red squares, amber circles
638
What close is used in a gps satellite
Atomic
639
What does 7700 Indicate on the ATC panel
Emergency
640
What does decca navigation system operate on
Low frequency
641
What does a diplexor do
Channel to RX
642
What does INS calculate on power up
Latitude
643
What does the radar contour button do
Alter the video amplifier
644
What frequency are VOR and ILS
VHF
645
What frequency increases radar relative range
Low
646
What frequency range does acars operate on
118-136MHz
647
What happens if frequency decreases without altering physical length of aerial
The aerial becomes capacitively reactive
648
What happens if frequency increases without altering the physical length of aerial
The aerial becomes inductively reactive
649
What is the ideal VSWR ok a radio transmission line
1:1
650
What is audio clipping used for in voice communication
To enable consonants to be heard better
651
What is ils mark beacon frequency
75 Jz
652
What is jitter used for in a DME transmission
To make an installation recognise its own transmission
653
What is mode 1 & 2 of GPWS
Excessive decent rate and excessive terrain closure rate
654
What is needed for RHO-RHO navigation
2 DME signals
655
What is primary radar
Radar that sends out pulse and receives reflected pulse
656
What is secondary radar
Signal returned from a transponder
657
What is the Q code for runway heading
QFU
658
What is the characteristic impedance range of a parallel cable
40-150ohm
659
What is the difference between DME transmit and receive pulse frequency
63MHz
660
What is the impedance of VOR or HF aerial cables
50 ohms
661
What is the main cause of standing waves in wave guide
Mismatch impedance
662
What is the millivolt deflection per dot on ILS/VOR
75/75
663
What is the output of a localiser NAV receiver
Polarity sensitive DC
664
What is the power at pulse
Peak power
665
What is the power output of a DME station
1000watts
666
What is the reply frequency of an aircraft transponder
1090MHz
667
What is the time between the F2 framing pulse and the SPI
4.35us
668
What is the time between the framing pulses F1 and F2 in ATCRBS reply
20.3 us
669
What is the time taken for one radar nautical mile
12.36 us
670
What is the average wave length of C band radar
7cm
671
What is track angle
The angle measured clockwise between true north and the aircraft ground track
672
What is the VHF comm range at 9000 ft
110Nm
673
What manoeuvre does tcas 2 advise the pilot to make
RA
674
What modulation is used for the beams of a localiser in an ils
90 left
150 right of centre line
675
What must be entered in to the ins before the aircraft moves
Present position
676
What orbits are gps satellites in
MEO
677
What precautions must a pilot take when using a back course approach
Reciprocal run way heading
678
What type of system is an ADF
Theta
679
What would be the purpose of an input from an irs being connected to a weather radar
To provide stabilisation for the radar antenna
680
When an adf sense antenna is repositioned from the bottom of the fuselage to the top the siding of the bearing indicator must be
Reverse R1 +R2 connections only
681
When an aircraft is at a height of 9500ft and the QNH is 500ft what is the distance the vhf can cover
120nm
682
When an aircraft is flying along the extended centreline of the run way it is in the
Equi-signal sector
683
When an aircraft is heading due north towards a VOR station the reference and variable signals will be
180 degree out of phase
684
When an AM carrier is modulated it’s bandwidth
Increases
685
When I’m manual mode the C.D.U alert lamp of the INS will flash
Two minutes before the next way point
686
When painting a neoprene costed radio antenna Don not use cellulose paint
Don not use cellulose paint
687
When painting fibre glass radio masts with neoprene cover
Do not use cellulose paint
688
When performing an adf check commercial stations
Can be used in addition to ASD nav stations
689
When signal bandwidth increases it cause
Deterioration of pulse shape and increase in noise
690
When substituting rad alt cable you should consider
The speed of propagation of rad alt signal
691
When the ILs marker hi/lo switch is set to lo
Receiver sensitivity is reduced by 10-12dB
692
When the inertial platform is torqued to perform like a Schiller pendulum
The platform oscillates with respect to the local vertical
693
When the pilot depresses the ident button where does the ident pulse appear
4.35us after the last frame pulse
694
When the VOR reference and variable phases are in phase quadrature the aircraft is at the
090 radial
695
When using the GPS
Once the database card has expired the system will continue to operate with a warning message
696
When will a mode c interrogation be ignored
When the P2 pulse is higher amplitude to P1
697
Where does air show moving map get its position information
GPS
698
Where is the antenna located for watching tv
Crown skin
699
Which 30Hz signal from a VOR ground station is frequency modulated
The reference signal which is constant
700
Which colour on the wxr woukd pilots avoid turb and heavy rain
Magenta
701
Which frequency band is used to have line of sight comes
VHF and uhf
702
Which if the following frequencies is allocated to VOR
114.3MHz
703
Which of the following has a hyperbolic curve
Loran C
704
Which if the following has priority of TCAS warnings
Stall warning
705
Which of the following has the best frequency stability
Colpitts
706
Which of the following is a DME frequency
1100Mhz
707
Which if the following navigation system is not a hyperbolic navigation system
Doppler
708
Which systems provide envelope modulation information for a GPWS
Flaps/undercarriage
709
Which would you use to test an aircraft transponder altitude reporting system
Read the altitude directly from ATC-600 panel
710
Why is an aerosol tuning unit used in a HF comm system
To electrically lengthen or shorten the aerial for optimum matching of impedance
711
With a vertical gyro simulated to aircraft right Bank the scanner in left hand position will
Tilt down
712
With ADD selected the sense aerial signal is
Added to the modulated loop aerial signal
713
With AGC inoperative sensitivity will be affected for signals with
Both high and low signal strength
714
With an atc code of 0600 selected the pulses transmitted are
B2 & B4
715
With and increase in radar pulse duration what happens to signal to noise ratio
Decrease
716
With no 1 hf transmitting the interlock circuit
Does not allow hf 2 to transmit or receive
717
With the adf controller set to ant
Only the sense signal is used
