RADIO AIDS AND INSTRUMENTS - Dgca question bank for pilots

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#1. When tracking a VOR radial inbound the a/c would fly:

A constant track

Great circle track

A Rhumb line track

#2. Kinetic energy and Dynamic pressure is denoted by

1/2 pVsqureS

pV squareS

1/2 p V square

#3. An a/c is attempting to home to a VOR on radial 064 °, the CDI shows 4 dots right with TO indication & at same time the co-located DME reads 45nm range. Where is the a/c in relation to the required track?

6nm right of track

6nm left of track

3nm left of track

#4. Which of the following can be input to the FMC using maximum of 5 alpha- numerics?

SIDS & STAR, reporting point & airway designator

Navigation facilities, reporting points & airway designators

Latitude & longitude, reporting points & airway designators

#5. Principle of operation of ILS localizer is that it transmits two over lapping lobes on

Different frequencies with different phases

Same frequency with different phases

Same frequency with different amplitude modulations

#6. The ILS glide slope generates false glide paths because of:

Ground returns from the vicinity of the transmitter

Back scattering of the signals

Multiple lobes in the radiation pattern

#7. Which statement is true regarding VSI in climb?

Pressure inside the capsule equalizes the pressure inside the case

Pressure inside the capsule drops faster than the pressure inside the case

Pressure inside the case drops faster than the pressure inside the capsule

#8. QNH IS

Airfield barometric pressure

The equivalent sea level pressure at the airfield

The setting that will indicate airfield height

#9. Due to Doppler effect an apparent decrease on the transmitted frequency which to the transmitting velocity will occur when;

The transmitter & receiver move towards each other

The transmitter moves away from the receiver

The transmitter moves towards the receiver

#10. Advantages of continuous wave (CW) radar over pulse radar systems is:

They are more reliable

Transmitter / receiver aerial system is smaller & less complex

There is no minimum range limitation

#11. For VOR & DME to be co-located the aerial separation must not exceed

100m in Terminal and 2000m outside Terminal area

50m in Terminal and 2000m outside Terminal area

30m in Terminal and 600m outside Terminal area

#12. DME & VOR are frequency paired because

Same receiver can be used for both aids

Both ground transmitters can be placed on the same site

Cockpit workload is reduced

#13. FMC position is most inaccurate

On T/O

At TOC

At TOD

#14. Which of the following co-ordinate systems is used by GPS receiver to determine position (Latitude, Longitude, Altitude)?

EUREF 92

WGS 84

ED 87

#15. In FMC operation, which of the following is true?

FMC combines the long term accuracy of IRS with short term accuracy of externa reference

FMC combines long term accuracy of IRS with long term accuracy of externas reference.

FMC combines short term accuracy of IRS with long term accuracy of external reference

#16. Availability of two frequencies in GNSS

Reduces errors caused by GDOP

Removes receiver clock errors

Reduces propagation error

#17. Real wander of a gyro can be caused by

Asymmetrical friction at the spin axis

Rotation of the earth

Increasing the RPM of the rotor

#18. In a gyro magnetic compass; from where does torque motor gets its information?

The flux gate

The error detector

The amplifier

#19. An accuracy of +/- 5? in VOR bearings received at an aircraft is achieved

Within DOC limits by day only

At all ranges within the DOC limits by day & night

Beyond the cone of confusion as far as the DOC limits by day & night

#20. Primary Flight Display (PFD) information is for?

Weather

Piloting

Engines & Alarms

#21. Below which altitude does the R.A indication on an EADI appear within circular scale as digital read out?

Above 2500'

Below 1000'

Above 1000'

#22. Aim of F/D is to provide information to the Pilot

Allowing him to return to desired path according to 45° intercept angle

Allowing him to return to desired path in an optimal way

About his position with regard to Radio electric axis

#23. HDG Hold mode is selected on F/D with course to steer of 180?. Your aircraft is on HDG 160?. The vertical bar of F/D

Cannot be centered

is centered if the aircraft is on optimum path to joining 180°

Is centered if aircraft has starboard drift of 20°

#24. Aircraft HDG 270°, F/D in HDG mode, new HDG 360° is selected. The vertical bar of F/D

Deviates to the right and will be centred as soon as you roll the aircraft to the bank angle calculated by F/D

Deviates to the right and remains in that position until the aircraft has reached HDG 360°

Deviates to the right and stops as long as the aircraft is more than 10° off the new selected HDG samo magnet

#25. An a/c wishes to track towards a VOR along a radial of 274°; if variation is 10°W; what should the pilot set on the OBS?

274

#26. In conventional VOR, which of the following statement is correct regarding directional signal:

Transmitter varies the amplitude of variable signal by 30Hz each time it rotates

Rotation of variable signal at a rate of 30 times/sec gives it the characteristics of 30Hz amplitude modulation

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

#27. An air temperature probe may be aspirated in order to:

Prevent icing

Measure air temperature on ground

Reduce the effects of solar radiation

#28. If the static vent of VSI is blocked during climb the needle will:

Stop at ROC of the a/c at the time of blockage

Indicate a decreasing rate of climb

Return to zero

#29. Purpose of Auto trim in Auto-Pilot is to

Help A/P to compensate for cross winds

Tell the Pilot when elevator trimming is required

Control elevator trimtab to relieve elevator load

#30. Purpose of Auto Throttle is

Purpose of Auto Throttle is

To synchronise engines to avoid yawing

To maintain constant engine power or speed

#31. An automatic landing system in which landing is continued manually in case . system failure during an automatic approach is called

Fail Operational

Fail Safe

Fail Passive

#32. What happens to A/P system set to VOR HOLD when aircraft flies over cone of confusion?

System will automatically disengage VOR hold

Existing HDG will be held until intelligible signals are regained

Pilot must de-select VOR hold

#33. Aircraft on A/P and ALT. HOLD. Pilot changes the barometric setting on press Altimeter. This will

Have no effect since A/P takes the static pressure from source

Make aircraft climb

Cause the A/P to disengage

#34. If only one A/P is employed to control climb, cruise and approach it must be

Fail safe and automatically disconnected in the event of failure

Redundant and fail safe

Fail soft and manually disconnected in the event of failure

#35. At what height the A/P be disengaged during semi-automatic landing?

400ft

500ft

#36. In ATC flight plan, letter ‘S’ in the equipment box indicates

VHF,RT,ADF,VOR,ILS

VHF,HF,RT,VOR,ILS

HF RT,VOR,ADF,ILS

#37. Thunderstorms will affect which of the following

NDB & HF

VHF ,NDB ,HF

None

#38. The RMI indicates the a/c magnetic heading. To convert RMI bearings of NDBs & VORs to true bearing, the correct combination for application of variation is:

NDB , Beacon position, VOR : ac position

NDB: ac position, VOR: beacon position

NDB AC POSITION, OR: ac position

#39. The limits of pitch & roll for a modern DGI are respectively

55°&85°

85°&55°

85°&85°

#40. Traffic advisory is

Given 20 to 30 sec after ra

Given 20 to 30 seconds before ra

Given 5 to 10 seconds before ra

#41. In GPWS MODE 3 audio alert is

Repeatedly- Don’t sink,Don’t sink

Whoop, Whoop, Don't sink, Don't sink

Repeatedly - Pull up, Pull up

#42. the vertical reference of data generation unit is

Vertical axis with 1 degree of freedom

Horizontal axis with 2 degree of freedom

Vertical axis with 2 degree of freedom

#43. An alc heading 017°(T) has a small island displayed on AWR at 45nm range on 60° left of azimuth line. To obtain a fix the bearing to plot will be

Range 45nm & QTE 060 from the center of the island

Range 45nm & QTE 317 from the center of the island

Range 45nm & QTE 137 from the center of the island

#44. What Aural indication would be observed when crossing OM on ILS approach?

Alternate Dots & Dashes at the rate of 2/sec

Continuous Dashes at the rate of 6/sec

Continuous Dashes at the rate of 2/sec

#45. In EGPWS Mode 5 G/slope alert is sounded when the aircraft:

Descends below 500 ft radio altitude withL/G retracted

Descends below 1000 ft radio altitude & more than 1.3 dots below the ILS G/P

Descends below 200 ft radio altitude with flaps retracted

#46. If one of the probes in a typical gas turbine engine, EGT sys becomes defective the indications would be:

Too low

Will not be affected significantly

Will be lost

#47. In TCAS – Il, once a conflict is resolved the R.A is discontinued. How is it indicated to the Pilot?

Intruder symbol changes to Green

An aural announcement "Clear of Conflict" and intruder no longer appears as a b solid red square

An aural announcement of "All Clear"

#48. When is mode 2 of GPWS is activated?

Barometric descent rate is excessive with respect to a/c height above terrain

Excessive height loss experienced after T/O or Go-around

Aircraft is flying into rising terrain

#49. The VOR/DME RNav equipment will give

Range and bearing of a selected station only if it is coincident with VOR/DMe transmitter

Range and bearing of any radio transmitter provided the aircraft position is knowN

Range and bearing of any_selected ground station provided it_is receiv transmissions from the pre-programmed VOR/DME

#50. In TCAS-Il the preventing RA is a resolution advisory:

Asking the pilot to modify the speed of the a/c

Asking the pilot to effectively modify the vertical speed of the a/c

Advises the pilot to avoid deviations from the current vertical rate

#51. If a large a/c is side slipping to the starboard & the port static vent is blocked what will the altimeter read?

Under read

Read correctly

Over read

#52. The GPWS would provide visual & aural warning if the a/c descended:

Below 500ft radio altitude with flaps not in landing configuration & speed bok mach .28

Below 200ft barometric altitude, flaps not in landing configuration & speed bal mach .28

Below 200ft radioaltitude ,flaps not in landing configuration & speed below mach .28

#53. In RLG the purpose of Dither motor is to

Compensate transport wander

Enhance accuracy of Gyro

Overcomelaser lock

#54. A ground radar with a frequency of 10Ghz would be used for:

Terminal area control & surveillance

Airfield surface movement surveillance

Airways monitoring

#55. An auto flight system which can safely continue with auto landing after a system failure is called:

Fail redundant system

Fail operational system

Fail passive system

#56. In RI Compass the annunciator light illuminates when

Compass is aligned with Dc

Flux is inoperative

Compass is on DGI mode

#57. An a/c is using 2D RNAV, is 23nm from a way point on 50nm leg. The wpt is 45nm from VORDME & the a/c is 37nm from VORDME. The range indicated to the pilot will Be

23 nm

37 nm

45 nm

#58. The electronic display system will have

1 primary & 1 secondary display unit for EICAS & change over selector to change to ECAM if, necessary

2 display unit for ECAM & 3 display for EICAS

Either ECAM or EICAS but not both

#59. Inputs to TCAS – Il include

Mode S transponder to co-ordinate avoidance maneuvers

Mode C transponder to co-ordinate avoidance maneuvers

Mode C and Mode S transponders giving RA and TA data and coordinating avoidance maneuvers

#60. When descending through an isothermal layer at constant CAS: the TAS will?

Increase at a linear rate

Increase at exponential ratE

Decrease

#61. In Doppler VOR in comparison to conventional VOR, the following is applicable:

Reference & variable signals are reversed but the phase difference remains same

Reference & variable signals are same but the phase difference is reversed

Reference & variable signals are reversed & the phase relationship remains the same

#62. Duct propagation

Decreases VHF range

Increases VHF ground range

Does not affect VHF

#63. In EICAS the lower unit display fails:

A compact message will only appear on the upper display unit

A compact message will only appear in the central display unit

A compact message will only appear in the upper display unit when the standby button is pressed on the control panel

#64. What point on earth would an earth rate wander and transport wander be zero?

North / South Poles

Equator

45 N/S

#65. Earth Rotation at 45N will cause the spin axis of DGI to move:

7.6 anti-clockwise

10.6 clockwise'

10.6 anti-clockwise

#66. What will compass indicate when aircraft lands on westerly HDG on magneti. equator?

Turn to South

Turn to North

No turn

#67. In the NH DRMC card of an aircraft decelerating on easterly HDG will turn

Clockwise over read

Anti-clockwise over read

Anti-clockwise under read

#68. If an aircraft accelerates in NH on westerly heading, the card moves indicating a turn to…….

Clockwise, North

Clockwise, South

Anti-clockwise, North

#69. If variation is west

True North is West of magnetic North

True North is East of magnetic North

Mag North is West of compass North

#70. TCAS-Il has inputs from radio altimeter in order to:

Determine the relative height of the intruder

Stop the TCAS operation below 2500ft

Gradually inhibit the RAs when getting closer to the ground

#71. When cruising on westerly heading DRMC will indicate:

Northerly turn

Southerly turn

No turn

#72. At magnetic equator, accelerating on westerly HDG, a DRMC will

Under read

Indicate a turn to South

Indicate correct Hdg

#73. GPWS must provide

Aural and visual warning

Aural warning which may be supplemented by visual warning

Visual warning which may be supplemented by audio warning

#74. At constant CAS in level flight a fall in ambient temperature will result in:

Lower TAS due to increase in air density

Higher TAS due to decrease in air density

Higher TAS due to increase in air density

#75. During climb after take-off from contaminated R/W, if the total pressure probe of ASI is blocked, the indicated airspeed will

Decrease abruptly to zero

Increase steadily

Decrease steadily

#76. What are the advantages of ADC providing altitude information?

Position error is corrected

Hysteresis error is corrected

Remote data transmission capability & feeding altitude information to number of instruments simultaneously

A & C

#77. Aircraft executes a rato 1 turn to the right in NH. Initial HDG was 330. After 30secs of the turn the DRMC will read

060

More than 060

Less than 060

#78. Aircraft takes off on westerly HDG in NH, a DRMC would

Under read

Indicate correct HDG

over read

#79. The main advantage of RMI over DRMC is that

It requires less maintenance

It has less moving parts

It senses rather than seeking magnetic meridian

#80. Where do the Isogonal lines converge?

At N/S magnetic poles

At magnetic north poles

At N/S magnetic & geographical poles

#81. 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 to remove weaker signals

#82. On IRS selection of ATT mode acts as back up for:

Altitude and heading only

Attitude

Attitude and heading only

#83. On a triple fit IRS, the present position on the CDU

Will not differ as information is averaged

Likely to differ as information comes from different sources

Will differ if initial input error has been made in present position

#84. The platform of an INS is maintained at right angles to the local meridian by applying corrections of

A/C maneuvers, earth rotation, transport wander & coriolis force

Vertical velocities, earth precision, centrifugal force & transport drift

Gyroscopic inertia, earth rotation, real drift

#85. As a result of CADC failure, the INS will no longer provide information about:

Wind direction & speed

Ground speed

Time at the next waypoint

#86. Which mode on INS CDU must be selected to display initial great circle track?

DSRTK/STS

TK /.GS

XTK/TKE

#87. When can a pilot change the data in FMS?

Every 28 days

Whenever deemed necessary

Never, FMS data base is read only

#88. FMC position is

Average of IRS positions

Computer generated from radio navigation position

Computer generated from IRS and radio navigation positions

#89. What is the source of variation information in FMS

From main DG

FMS calculates MH and TH from FMC

Variation information is stored in each IRS memory card and applied to TH by respective IRS

#90. An altimeter reads 11000ft with subscale setting of 1013.25mb. QNH is 1023 OAT is +3?C. The pressure altitude of the a/c is:

11000

10260

11740

#91. What does FMS provide?

Automated navigation and manual performance management

Automated navigation and automated performance management

Manual navigation and manual performance management

#92. How does FMS calculate ground speed?

Input of HDG from IRS and TAS from ADC and wind from selected meteorologica! data

Input from ADC of TAS and wind velocity

Input from IRS

#93. If sink rate is excessive, the GPWS indication will be:

Too low, too low, whoop, whoop pull up

Too low gear, too low gear, whoop, whoop pull up

Sink rate, sink rate, whoop, whoop pull up

#94. What is the function of MCDU in FMS when carrying out pre-flight check?

Manually initialize IRS, FMC and auto throttle

Manually initialize the FD and FMC with dispatch information

Manuallyinitialize the IRS and FMC with dispatch information

#95. What is the latest time at which the INS/IRS may be selected to Nav. mode

After passengers and freight are on board

Immediately prior to push back or taxi from gate

At holding point

#96. The TCAS gives avoidance Resolutions?

In horizontal & vertical planes

In the vertical plane only

In the horizontal plane only

#97. Rate integrating gyro is used in which of the following?

Inertial attitude unit

'Inertial navigation unit

Rate of turn indicator

#98. In an IRS accelerations are measured in relation to:

The direction of true North

WGS 84 earth co-ordinates

The a/c axis

#99. Which of the following will give maximum range to the surface radio wave?

5000Khz

2182Khz

15Khz

#100. The phenomena of coastal refraction which affects the accuracy of ADF bearing:

Is most marked at night

Can be minimized by using beacons situated well inland

Can be minimized by taking bearing when the signal crosses the coast line at right angles