Vayudoot Aviation

1. The FMC position is?

Half way between the IRS and radio navigation positions

Computer generated from the IRS and radio navigation positions

The average of the IRS positions

Computer generated from the radio navigation positions

2. What are the positions (In the order left to right) on the Boeing 737 - 400 IRS Mode Selector Unit (MSU)?

OFF STBY ALIGN NAV

OFF ALIGN NAV ATT

OFF STBY NAV ATT

OFF STBY ATT NAV

3. Double Integration of the output from the east/west accelerator navigation system(INS) in the NAV MODE given

Distance north/south

Distance east/west

Vehicle longitude

Velocity east/west

4. Which of the following statements is true of a Ring Laser Gyro?

It is not necessarily fixed to the true north but takes long time to erect

It is fixed to true north and is quick to erect

It doesn't suffer from 'lock in' and is unaffected by the earth's gravitational force

It is not necessarily fixed to true north and is quick to erect

5. The Boeing 737-400 Flight Management System (FMS) provides?

Automatic navigation & manual performance management

Manual navigation & automatic performance managment

Automatic navigation & automatic performance managment

Manual navigation & manual performance managment

6. Which of the following lists all of the methods that can be used to enter 'Created Waypoints' into the CDU of a B737 - 400 Electronic Flight Instrument System?

Identifier grid reference, location name, Height above MSL, latitude and Rhumb line position.

Identifier name and range; location name; Height above MSL; latitude nd longitude.

Identifier bearing/distance; place bearing/place bearing; along-track displacement; latitude and longitude.

Identifier range, location name; Height above MSL; latitude and longitude.

7. For how long does the data in the FMS database remain valid?

28 days

One week

Variable

56 days

8. In order to maintain an accurate vertical using a pendulous system, an Aircraft inertial platform incorporates a device?

Without damping and a period of 84.4 SEC

With damping and a period of 84.4 MIN

With draping and a period of 84.4 SEC

Without damping and a period of 84.4 MIN

9. What do you call a system of gyros and accelerometers that is fixed to the aircraft?

Fixed

Laser

Stabilised

Strapdown

10. What do you call a system of gyros and accelerometers that is fixed to the aircraft?

Stabilised

Strapdown

Laser

Fixed

11. List the sequence of pages on start-up of the Boeing 737-400 FMS?

POS INIT, IDENT, DEPARTURES

POS, INIT, RTE, IDENT

IDENT, POS INIT, DEPARTURES

IDENT, POS INIT, RTE

12. In a laser reference system (IRS), are compared to a gyro reference system (INS)

The accelerometers are strapped down but the platform is gyro stabilised.

Accelerometers and platform are both strapped down.

The platform is strapped down but the accelerometers are gryo-stabilised.

Accelerometers and platform are both gyro-stabilised.

13. What are, in order of highest priority followed by lowest, the two levels of message produced by the CDU of the B737-400 EFIS?

Urgent and Routine

Warning and Advisory

Caution and Advisory

Warning and Caution

14. How is the FMC position produced?

Computer generated from the radio navigation positions

Half way between the IRS and radio navigation positions

The average of the IRS position

Computer generated from the IRS and radio navigation positions

15. Some Inertial reference systems are known as 'strapdown'

The system is mounted on a stabilised platform

The accelerometers are fixed but the gyros are stable

The gyros are fixed but the accelerometers are stable

The system is mounted and fixed to the aircraft strap

16. The IRS position is updated?

Only on the ground during the alignment proceudre.

IRS positions are updated by pressing the 'Take-off at the start of the take-off roll

During flight IRS position are automatically updated

Updating is normally carried out by the crew when position (VOR station or NDB)

17. Weather radar Displays are available on the Boeing 737-400 EFIS EHSI, when the system is set to?

MAP, PLAN, EXP VOR/ILS

MAP, PLAN, FULL VOR/ILS

MAP, EXPVOR/ILS EXP NAV

MAP, FULL VOR/ILS, FULL NAV

18. On the IRS, selection of ATT mode gives attitude?

Only

Altitude, and heading

Heading and groundspeed

And heading

19. What are the positions (in the order left to right) on the Boeing 737-400 IRS Mode Selector Unit (MSU)?

OFF STBY ATT NAV

OFF STBY ALIGN NAV

OFF STBY NAV ATT

OFF ALIGN NAV ATT

20. When can a pilot change the data in the FMS database?

Every 28 days

When there is a fault

When it is deemed to be necessary

Never, because the FMS database is read-only

21. In a ring laser gyro, the purpose of the dither motor is to

Enhance the accuracy of the gyro at all rotational rates

Stabilise the laser frequencies

Compensate for transport wander

Overcome laser lock

22. How does the FMS calculate groundspeed?

Input of heading from either the IRS or gyro compass, TAS from ADC and wind velocity from selected metrological data

Input from ADC of TAS and wind velocity

Input from DME with change of range integrated with respect to time

Input from IRS

23. Gyro-compassing in an INS?

It is possible in flight as the gyros cannot differentiate between acceleration due to aircraft movement and initial alignment errors

Is possible in flight as the gyros can differentiate between acceleration due to aircraft movement and initial alignment errors.

Is not possible in flight as the gyros can differentiate between acceleration due to aircraft movement and initial alignment errors.

It is not possible in flight because the gyros cannot differentiate between acceleration due to aircraft movement and initial alignment errors

24. In order to maintain an accurate vertical using a pendulous system, an aircraft inertial platform incorporates a device?

With damping and a period of 84.4 MIN

Without damping and a period of 84.4 MIN

Without damping and a period of 84.4 SEC

With damping and a period of 84.4 SEC

25.
Which Cyan symbol below represents an off-route waypoint?

C

D

B

A

26. If an INS temporarily loses its power supply in flight?

It will be usable only in the NASV mode

It can only be used for attitude reference

It must be switched off for the remainder of the flight

It will functions normally

27. Gyro drift occurs when the spin axis moves in the?

Horizontal

Horizontal and vertical

Neither, because its definition is not related to these axes

Vertical

28. Alignment of INS and IRS equipments can take place in which of the following modes?

ALIGN only

NAV and ALIGN

ATT and ALIGN

ALIGN and ATT

29. When can a pilot change the data in the FMS database?

Every 28 days

Never, because the FMS database is read-only

When it is deemed to be necessary

When there is a fruit

30. In an Inertial Navigation system (INS), what is the output of the first stage North/South Integator?

Groundspeed

Velocity along the local meridian

Change of latitude

Latitude

31. The latest point at which an INS or IRS may be selected to NAV mode is?

On operation of TOGA switch when opening the throttles for the take-off

After passengers and freight are aboard

At the holding point

Immediately prior to push back or taxi from the gate

32. Which of the following statements is true of a Ring Laser Gyro?

It is not necessarily fixed to true north and is quick to erect

It is fixed to true north and is quick to erect

It is not necessarily fixed to true north but takes along time to erect

If doesn't suffer from 'lock in' and is unaffected by the earth's gravitational force

33. In order to maintain an accurate vertical using a pendulous system, an aircraft Inertial platform incorporates a device?

With damping and a period of 48.4 SEC

With damping and a period of 84.4 SEC.

With damping and a period of 84.4 MIN

With damping and a period of 48.4 MIN

34. When initial position is put into a B737-400 FMS, the system?

Rejects initial latitude error, but it will accept longitude error

Rejects initial longitude error, but it will accept latitude error

Rejects initial latitude or longitude error

Cannot detect input errors, and accepts whatever is put in

35. In an Inertial Navigation System(INS), Ground Speed (GS) is calculated?

From TAS and WN from RNAV data

By integrating measured acceleration

From TAS and WN from Air Data Computer (ADC)

By integrating gyro precession in N/S and E/W directions respectively

36. In a ring laser gyro, the purpose of the dither motor is to

Overcome laser rock

Enhance the accuracy of the gyro at all rotational rates

Stabilise the laser frequencies

Compensate for transport wander.

37. In what formats can created waypoints be entered into the scratch pad of the B737-400 FMS?

Place Bearing/Distance, Place Bearing/Place Bearing, Across-Track Displacement, Latitude and Longitude

Place Bearing/Distance, Place Bearing/Place Bearing, Along-Track Displacement, Latitude and Longitude

Place Bearing/Distance, Place Distance/Place Distance, Along-Track Displacement, Latitude and Longitude

Place, Place Bearing/Distance, Along-Track Displacement, Latitude and Longitude

38. In an Inertial Navigation System(INS), the output of the first stage North/South integrator is?

Change of latitude

Latitude

Velocity along the local meridian

Groundspeed

39. How often can a pilot update the data in the FMS database?

Every 28 days

When there is a fruit

Never, because the FMS database is read-only

When it is deemed to be necessary

40. A pilot turns off the power to his IRS whilst in flight. He switches it on again after just a few seconds. What will be the effect?

It can be repositioned whilst in flight

There will be no effect

It cannot be used for navigation, but can be used provide attitude information

It cannot be used and must be shut down

41. FMC aircraft position determined by radio navigation is derived on the B737-400 FMS from?

VOR/VOR

DME/ADF

VOR/DME

DME/DME

42. An aircraft equipped with an Inertial Navigation System (INS) flies with INS 1 coupled with autopilot 1. Both inertial navigation systems are navigating from waypoint A to B. The inertial systems' Central Display units (CDU) shows. XTK on INS 1 = 0, XTK on INS 2 = 10L (XTK = cross track). What can be deduced from this information?

Both systems are drifting

At least one of the inertial navigation systems is drifting

Both systems are serviceable as this error is within limits

The INS2 is drifting

43. In which IRS mode does gyro-compassing takeplace?

ATT

ALIGN

NAV

ON

44. The principle of 'Schuler Tuning' as applied to the operation of Inertial Navigation Systems/Inertial Reference Systems is applicable to

Only to 'strapdown' laser gyro systems

Both gyro-stabilised platform and strapdown systems

Both gyro-stabilised and laser gyro systems but only when operating in the non 'strapdown' mode.

Only gyro-stabilised systems

45. In a laser reference system(IRS), as compared to a gyro reference system (INS)

The platform is strapped down but the accelerometers are gyro-stabilised

The accelerometers are strapped down but the platform is gyro stabilised

Accelerometers and platform are both strapped down

Accelerometers and platform are both gyro-stabilised

46. What is the highest priority and lowest priority, message produced by the CDU of the B737-400 EFIS?

Warning and Advisory

Caution and Advisory

Urgent and Routine

Warning and Caution

47. What is the function of the MCDUs in the B737-400Flight Management System when carrying out preflight checks?

Manually initialise the IRSs,FMC and Authorities with dispatch Information

Automatically initialise the IRSs and FMC with dispatch information

Manually initialise the Flight Director System and FMC with dispatch information

Manually initialise the IRSs and FMC with dispatch information

48. Alignment of INS and IRS equipments can take place in which of the following modes?

NAV and ALIGN

ALIGN only

ATT and ALIGN

ALIGN and ATT

49. What do the sensors of an INS measure?

Acceleration

Precession

Velocity

The horizontal component of the earth's rotation

50. If an IRS loses its position mid-flight it must?

Have a new position inserted

Not be used in NAV mode

Be selected to ALIGN and then to NAV

Be turned OFF

Question Bank

Questions for INS/IRS/FMS