RADIO AIDS AND INSTRUMENTS - Dgca question bank for pilots

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#1. Process of aligning the stable platform with local meridian in INS is known as:-

Coarse leveling

Fine levelling

Gyro compassing

Gyro compassing – the platform can be aligned in azimuth by connecting the gyro normally used to stabilise the platform about an East-West axis, to the azimuth gimbal motor.

Platform must be orientated to True north- gyro compassing (position verified).

#2. Descending from Fl390 at max ground speed , what will the pilot be limited by:

Vmo initially then MMO at specific altitude

Mmo initially then Vmo at a specified altitude

Vne initially then Mmo at a specified altitude

Vmo – is expressed in CAS (Calibrated Airspeed, in Knot), which is usually associated with operations at lower altitudes and deals with structural loads andflutter;

Mmo – is expressed in Mach Number, is associated with operations at higher altitudes and is usually more concerned with compressibility effects and flutter.

#3. yaw damping system is necessary in aircraft which:

Does not have swept wings

Are susceptible to Dutch rol

To control rate of yaw following rudder input

Dutch roll is caused by the interplay between lateral stability around the longitudinal axis (roll) and longitudinal stability around the vertical axis (yaw) of an aircraft in flight. An aircraft with an excess of lateral stability will by default have poor directional stability and therefore will be susceptible to dutch roll.

To increase the damping forces at altitude could mean an increase in the overall size of the stabilizing surfaces but this would also increase drag. Another option is to produce an aircraft that is dynamically stable at lower and middle altitudes and have a system to automatically counter dutch roll which can detect the start of the oscillations at levels below the threshold of the pilots ability to detect and with rapid, effective rudder deflections, stopping the dutch roll almost before it starts. This system we call a Yaw Damper.

#4. Automatic stabilizer trim system:-

Adjusts the position of the elevators to align with horizontal stabilizer

Can only be engaged with A/P engaged

Adjusts the position of horizontal stabilizer to centralize the elevators

#5. GPWS mode 5 is inhibited when:-

Mode 1 is active

Aircraft is below the glide path

Mode3 Is active

#6. Mode 7 of EGPWS gives warning of:-

Wind shear below a Radio altitude of 1500'

Minimums below R.A of 1000

Clear Air Turbulence

#7. A radio wave is:

An energy wave comprising of electrical & magnetic field in the same plane

An electrical field alternating with magnetic field

An energy wave where electrical field is perpendicular to magnetic field

#8. During Cat-Il ILS auto-approach, the source for altitude information is:

Basic altitude capsule

Radar altimeter which becomes effective below 2500ft

Mode comparator sensor

#9. Which of the following is True:

Ground reflected waves may interfere with surface waves

Ground waves include space waves and surface wave.

Sky waves and direct waves combine to produce space waves

#10. An A/c is steering MH 335 degree, it’s rbi indicates 355 degree variation in the area is 4 deg west deviation 2 deg east, calculate (1) Magnetic heading to ndb (2) magnetic bearing from NDB (3) true bearing from ndb

(1) 020 deg (2) 340 (3) 160

(1) 200 deg (2) 355 deg (3) 175 deg

(1) 330 deg (2) 150 deg (3) 146) deg

#11. You are using hf voice communication and have good two way signal during day ,what must be done to maintain communication at night?

Change to Higher frequency

Change to Lower frequency

Stay at the same frequency but increase the volume

#12. What affects HF range ?

Transmission power, time of the day, geographical location, frequency in season of the year & disturbances in the ionosphere

Transmission power, time of the day, height of the antenna, A/C altitude

A/C speed, A/C altitude, season of the year, disturbances in ionosphere

#13. Which emergency frequency is preferred for survival Radio transmission during flight over large oceans?

243.00MHZ

121.5MHZ

406.025MHZ

#14. To double the range of primary radar power required to be increased by a factor of.

#15. GPWS must provide:

Visual warning

Aural &visual warning

Visual & aural warning which may be supplemented by tactile warning

#16. Which of the following factors affect the accuracy of ADF?

Night effect, Trophospheric ducting, Coastal refraction, Hill effect

Coastal refraction, Static interference, Loop alignment, Quadrantal error

Thunderstorms,Loopalignment, Duct propagation

#17. Which of the following will give max. range from NDB?

A vertically polarized NON A1A signal

A vertically polarized A2A signal

A vertically polarized NON A2A signal

#18. NDB emits a NON A2A signal, what should pilot do with BFO switch?

ON all the time

ON during tuning and identification

ON during tuning only

#19. Howcan a pilot reduce the effect of Coastal refraction while flying over sea?

By flying at high altitude and using NDB well inland

By flying at low altitude and using NDB well inland

By flying at high altitude and using NDB close to coast

#20. If in zip VOR station has 100 / 30000 written what does it indicate?

Aircraft can receive signal at 100 km if flies at 30000

Aircraft should not use vor outside 100 nm or above 30000

Aircraft should not use vor on 100 deg radial below 30000

#21. Protected range of ndb is valid for?

At all times

Only at night

Only during day

#22. What is the max range at which adf can be safely used at night?

Half the doc range

70 nm

200 nm

#23. If in aip VOR station has 100/ 30000 written what does it indicate?

Aircraft can receive signals at 100 km if flies at 30000

Aircraft should not use vor outside 100 nm or above 30000

Aircraft should not use vor on 100 deg radial below 30000

#24. What factors affect vor range?

Transmission power, aircraft altitude, night effect

Station elevation , aircraft altitude ,transmission power

Station elevation, site error, static interference

#25. What factors affect vor accuracy?

Beacon alignment, site error, propagation error,

Airborne equipment error, propagation error, coastal effect

Site error night effect, beacon alignment

#26. Which indication is acceptable if you have tune vor station marked as vot during pre flight test?

180 degree from

004 degree from

359 degree to

#27. GPWS mode 2 gives warning of high terrain closure rate flaps in landing position between …..ft agl &….ft agl

1500 & 220 ft

800 & 200 ft

790 & 220 ft

#28. Which of the following has the greatest effect on accuracy of adf bearings?

Interference form other ndb particularly by day

Interference between ac aerial

Interference form other ndb particularly by night

#29. Frequency band between 108 mhz to 112 mhz contains ? EVEN & ODD

Vor signal only

ILS signal only

Vor and ils signals

#30. To improve the resolution of radar display it requires

Narrow pulse width and narrow beam width

High frequency & large reflector

Wide beam width & wide pulse width

#31. Why the mapping beam of awr is referred to as the cosecant square beam ?

Range is found by measuring the cosecant square of the angle of the beam

The cosecant square of the angle of the beam is proportional to ac speed

The transmitter power is proportional to the cosecant square of the angle from the horizontal

#32. An ac is flying on true track of 090 towards vor located near the equator where magnetic variation is 15 deg east variation at ac is 8 deg east , what is the ac radial?

255

278

285

#33. Why AWR uses frequency of approximately 9 ghz?

So that antennae can fit into nose cone

Wavelengths is such that the reflections are obtained only from large water droplets

Shorter wavelengths allows signals to be reflected from all sizes of water droplets

#34. What is meaning of swept gain in AWR?

Transmission power increased as range increases

Transmission power increases as cosecant of the angle from horizontal

Receiver sensitivity increases with time

#35. On switching AWR a single line appears on the display, this means

Transmitter is unserviceable

Receiver is unserviceable

Antennae is not scanning

#36. You are heading 080° T when you get range and bearing from awr on a headland 185 nm 30° left of nose , what true bearing do you plot?

050° from headland using headlands meridian

230° from headland using headlands meridian

230° from headland using aircrafts meridian

#37. You are hdg 345° , var 20° east you take a radar bearing of 30° left of the nose from island what bearing do you plot?

160°t

155°t

140°t

#38. The term drift refers to the wander of the axis of gyro in ?

Any plane

Horizontal plane

Vertical plane

#39. GPWS may give warnings of : 1 ) excessive sink rate. (2) excessive closure rate with terrain (3) excessive proximity with ground when not in landing configuration (4) excessive angle of bank

1,2,3

2,3,4

1,3,4

#40. How does GPS receiver determine from which satellites is it receiving the signal ? PRM

Each satellite uses its own frequency

Each satellite sends its signal at different times

Signals are sent on the same frequency and coded

#41. What does a GPS receiver measure?

Time between transmission and reception of a signal from a satellite

Time between reception of signals from two satellites

Phase difference between signals from two satellites

#42. Which of the following is not a GPS error?

Ephemeris error

G.D.O.P error

Clock error

Tropospheric ducting error

#43. Aircraft DME is able to discriminate between pulses intended for itself and pulses intended for other aircraft because:-

Aircraft transmits and receives on different frequencies

Each aircraft has its unique twin pulses

Aircraft rejects pulses which are not synchronized with its own random pulse recurrence rate

#44. Why are SSR transmissions in pairs of pulses?

To prevent random noise being falsely identified

To prevent side lobe suppression

To indicate the mode of interrogation

#45. The availability of 4096 codes in SSR is applicable to:

Mode a

Mode c

Mode s

All are correct

#46. What does the SPI facility of SSR do?

It switches the mode A response ON & OFF for 20secs

It sends an extra pulse of 4.35 micro seconds for 20secs after mode A transmission

It sends an extra pulse for 1min

#47. A height ring in an AWR can be used

To determine that the weather radar is functioning

To determine the exact a/c height above the surface

As a range marker

#48. What is the normal range of ACAS?

120 nm

60 nm

30 nm

#49. What info is available on ACAS-1

Range, direction and Track of conflicting traffic

Range and direction of conflicting traffic

Range of conflicting traffic only

#50. How much warning will TCAS – 1 give a pilot before possible collision

10 sec

30 sec

40 sec

#51. Why is the effect of returns from storms not a problem with SSR?

Frequency is too high

Ssr does not use echo principle

The prf is jittered

#52. The advantages of SSR mode S are:

Improved resolution & TCAS

Data link & reduced voice communications

TCAS & no RT communication

#53. Accuracy of SSR mode C altitude displayed to Air Traffic Controller is:

+- 25ft

+- 50ft

+- 75 ft

#54. Compass swing is performed in order to correct for?

Acceleration

Aperiodicity

Deviation

#55. Which of the following is not an input to GPWS?

Radio Altimeter

ILS LOCALISER

Flap position

#56. An a/c is tracking to intercept the ILS localizer inbound on the approach side but outside the published coverage angle:

Will receive false on course or reverse sense signals

Will normally not receive signals

Will receive signals without coding

#57. Which of the following will not trigger warning from G.P.W.S?

High rate of descent close to ground

Rising ground ahead

Approaching with landing gear not locked down

Approaching with flaps up

#58. Temperature is measured in an a/c engines by means of: 1. Thermocouples 2. Mercury 3. Resistive elements 4. Capacitive elements

1&2

3&4

1&3

#59. In a radio altimeter when the system error occurs during approach

Dh lamp flashes &audio signal sounds

Ht indication is removed

Audio warning signal sounds

#60. An altitude warning system

Automatically disengages auto pilot at 500ft

Provides visual warnings when approaching a selected altitude

Activate a warning light and bell when approaching a selected altitude

#61. GPWS will give an altitude alert warning when

Angle of bank is excessive at too low altitude

Aircraft loses glide slope signal

DH is reached in CAT 2 or CAT 3 ILS approach

#62. What are the basic elements transmitted by GPS satellites?

Off set of satellite clock from GMT

Ephemeris data, lonospheric delays

All are correct

#63. How should a pilot respond to a TCAS RA?

Visually identify the intruder before taking corrective action

Disengage auto pilot & immediately comply with RA

Contact ATC before any maneuver

#64. From where does TCAS obtain its altitude information?

Barometric altimeter

Radio altimeter

Mode C transponder along with mode S

#65. The inputs a pilot will make to the FMC during pre-flight initialization will include:

ETD, A/C position, Planned route

Planned route, A/C position, Departure runway

NAV data base, A/C position, Departure aerodrome

#66. n an EHSI the navigation information comes from:

FMC, Radio navigation

IRS, Radio navigation, TAS, Drift

FMC, Weather mapping, Radio navigation

#67. An altitude alerting system

Alerts pilot if aircraft deviates from selected altitude

Alerts pilot when DH is reached

Alerts pilot when selected level is reached

#68. The altitude alerting system:

A light is illuminated when selected altitude is attained

Is annunciated by light & / or sound when a/c approaches selected altitude

Disengages autopilot auto trim at selected altitude

#69. What information will TCAS provide to indicate an intruder aircraft with no altitude reporting facility?

Preventive RA

Corrective RA

TA only

#70. In TCAS corrective RA includes

Climb, climb

Traffic, traffic

Monitor vertical speed

#71. Radio altimeter are based on principle of

Frequency modulated carrier wave

Pulse modulated carrier wave

Amplitude modulated carrier wave

#72. GPWS modes include

Stall warning, incorrect flap setting, high altitude descent & high ROC

Excessive glide slope deviation, loss of altitude after T/O or Go around 3

Incorrect Tap setting, excessive sink rate

b & c

#73. Which statement is correct with reference to GPWS?

In all six modes the audible alerts & warnings are accompanied by red flashing pull up light Gear Nor down

Mode 4A activates when the a/c descends below 500ft radio altitude at a speed less than .35 mach with landing gear retracted

Mode 4A activates when the a/c descends below 500ft barometric altitude at a speed less than .28 mach with landing gear retracted

#74. You are flying from VOR A to VOR B on HDG 120 with VOR tuned to station A. CDI indicates 3 dots to the right midway between A and B you switch to VOR B. What will be the indication of CDI and TO/FROM indicator

3 dots to the right, TO indication

3 dots to the left, TO indication

3 dots to the right, FROM indication

#75. In a left turn the ball of the turn coordinator is to the right; what corrective action is required?

More right rudder

Less right bank

More left bank.

#76. When checking the VOR against VOT the correct indications are

180 TO, CDI centre

180 FROM, CDI centre

360 TO, CDI centre

#77. An a/c on ILS, has equal amount of deviation on localizer and glide slope. Which-will show greater deflection?

Glide slope

Localizer

Same

#78. What is the ADC input to FMC?

Heading

VOR/DME position

TAS

#79. If during a manoeuvre, satellite being used for position is shadowed by the wing, the on the position will be:

None

Position will be degraded

Another satellite will be selected , there will be no degradation in position

#80. GPWS will provide warning to the pilot if the AC descended below

500 ft radio altitude with flaps not in landing position

200 ft barometric altitude flaps not in landing position & speed below MN .28

200 ft radio altitude , flaps not in landing position & speed below MN .28

#81. Time required for GNSS receiver to download satellite Almanac for GPS is:

12.5 min

12 Hrs

30 sec

#82. How does night effect affect ADF?

Causes false bearings as Goniometer locks onto skywave

Skywave interference affects the Null position & is worst at dawn & dusk

Interference from other NDB's which is worst at dawn & dusk

#83. An engine vibration monitoring system of a turbo-jet a/c, vibration by the engine is

Amplified & filtered before being fed to the cockpit indicator

Inversely proportional to engine speed

Fed directly to the cockpit indicator without amplification & filtering

#84. Use of alternate static source fed from within the cabin, static pressure sensed is likely to be:

Lower than ambient pressure due to aerodynamic suction

Higher than ambient pressure due to position error

Lower than ambient pressure due to position error

#85. The properties of a gyro are: 1. Mass 2. Rigidity 3. Inertia 4. Precession 5. Rotational speed

1,2,3

2&4

2&3

#86. In case of excessive descent rate the GPWS generates following aural warning

DON’T SINK, DON’T SINK

SINK RATE SINK RATE followed by WHOOP WHOOP PULL UP (TWICE)

TERRAIN TERRAIN followed by whoop whoop pull up ( twice)

#87. Aural alerts associated with mode 4 of GPWS are:

TOO LOW GEAR, TOO LOW FLAPS, TOO LOW TERRAIN

TOO LOW TERRAIN only

TOO LOW, CHECK FLAPS, CHECK GEAR

#88. In EGPWS the terrain displayed in magenta indicates

The terrain is slightly above the aircraft altitude

The terrain is positively above the aircraft altitude

There is no data in the database for particular terrain

#89. If a manifold pressure gauge consistently registers atmospheric pressure, the probable cause is:

Leak in pressure gauge line

Too high float level

Ice in the induction system

#90. The formula used to determine the height displayed on RA is that the difference in frequency = rate of change of frequency

Times the time taken

Times the 1/2 time taken

Times twice the time taken

#91. A temperature sensor has a recovery factor of .95. The temp measured will be equal

95% of static air temperature (SAT)

Ram air temperature (RAT)+ 95 % of ram rise

Static air temperature (SAT)+ 95 % of ram rise

#92. VOR indications on an RMI whose deviation is not zero:

Are magnetic

Are compass

Must have deviation applied before being used

#93. Which statement is true?

Probes used for RAT have a recovery factor of .75 to .90 while for TAT it is 1,0

Probes used for RAT have a recovery factor of 1.0

Probes used for TAT are directly connected to temperature indicator instruments

#94. At a given altitude, the Hysteresis error in an altimeter varies with

Mach number

Time passed at given altitude

Aircraft altitude

#95. The sequence of display accessed on initialization of FMS is:

POS INIT, IDENT, RTE

IDENT, RTE, POS INIT

IDENT, POS INIT, RTE

#96. When DME transponder becomes saturated:

It reverts to standby mode

It increases the number of pulse pairs to meet the demand

it increases the receiver threshold level to remove weaker signals

#97. Azimuth resolution in an AWR depends on:

Frequency of the transmission

Beam width of the transmission

PRF of the transmission

#98. If the computed a/c position becomes less accurate, the EGPWS affected function is

Terrain display on the ND

Flight into terrain when not in landing configuration

The excessive rate of descent

#99. Approximately what height is the G/slope centre line at the MM of a typical ILS?

100'

200'

300

#100. In Doppler VOR the reference signal is…….the bearing signal is ……and the direction of rotation of the bearing signal is_……..Anti Clocku

AM, FM, Anticlockwise

AM, FM, Clockwise

FM AM Anticlockwise