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CPL Test Series
Question Bank
Questions for KW INSTRUMENTS INS/IRS/FMS
Answer the following questions
Test Mode
Training Mode
1. In an IRS system?
Both the platform and accelerometers are strapped down
Both the platform and accelerometers are gyro-stabilised.
The platform is gyro-stabilised but the accelerometers are strapped down.
The platform is strapped down but the accelerometers are gyro-stabilised.
2. A rate Integrating gyro is used in ?
Artificial horizon.
Turn and slip Indicator.
Flight Director.
Inertial navigation system.
3. The product of the first integration of the E/W acceleration sensed by an INS system is?
Distance.
Speed along the local parallel.
Speed along the local horizontal
Departure.
4. An FMS database is valid for?
56 days
7 days
It depends upon operational area.
28 days
5. The Schuler period is?
84 minutes.
22 minutes.
1 oscillation in azimuth.
66 minutes.
6. The selection on an IRS mode panel are used in the following order?
OFF STBY ALIGN ATT NAV.
OFF ALIGN STBY NAV ATT.
OFF STBY ALIGN NAV ATT.
OFF ALIGN STBY ATT NAV.
7. Setting zero cost index on an FMS gives?
Lowest total costs.
Best range.
Best endurance.
Best time.
8. The vertical reference unit of a three axis data generator is equipped with a gyro with?
2 degrees of freedom and a horizontal spin axis .
2 degrees of freedom and a vertical spin axis .
1 degree of freedom and a horizontal spin axis .
1 degree of freedom and a vertical spin axis .
9. While inertial platform system is operating on board an aircraft , it is necessary to use a device with the following characteristics, in order to keep the vertical line with the pendulous system?
With damping and a period of about 84 minutes.
With damping and a period of about 84 seconds.
Without damping and a period of about 84 minutes.
Without damping and a period of about 84 seconds.
10. The JAR 25 standard colour for an FMS active planned route is?
Magents
Cyan
White.
Red
11. What is the first page on an FMS CDU?
IDENT
INDEX.
PRE-START.
TAKE-OFF.
12. The triangular cavity in a RLG is filled with which combination of gasses?
Helium and argon.
Hydrogen and neon
Hydrogen and argon.
Helium and neon.
13. The correct latitude must be put into INS?
Large latitude errors will be undetected but cause large errors during the subsequent flight.
Because small latitude errors will not be detected but will cause unbounded errors during the subsequent flight.
Because it cannot detect initial latitude.
Because it cannot detect latitude. changes.
14. The sequences for switching on INS is?
Off, Standby, Align, Nav.
Off, Align, On, Standby.
Off, Align, Standby, Nav.
Off, On, Align, Standby.
15. With reference to an FMS, what does the term managed guidance mean?
The term managed guidance is not related to FMS.
The FMC gives commands to the autopilot
The INS gives commands to the autopilot.
The autopilot gives commands to the FMC.
16. with reference to Inertial Navigation Systems, the functions of the integrator are? 1. At the second stage integration to suppress unbounded errors (when in nav mode). 2. At the first stage of integration to convert accelerations with respect to time, into speed, (when in nav mode.) 3. At the second stage of integration to convert speed with respect to time, into distance gone, (when in nav mode). 4. To align the platform (when in level and align modes)
Only statements 2 and 3 are correct.
Only statements 1,2 and 3, are correct
All of the above statements are correct.
Only statements 2,3 and 4 are correct.
17. A longitude error in an INS will cause
Will cause no problems at all.
A failure to align.
Will be corrected for once the E/W accelerometer has aligned to true north
Poor alignment and degraded accuracy.
18. Laser gyros are used in an IRS. Why must accurate latitude and longitude be inserted?
To check the function of the laser gyros.
To determine magnetic north.
To determine the computed trihedron
To compensate for aircraft movement.
19. What happens If an FMC operating in VNAV and LNAV modes reaches a waypoint beyond which no route has been input?
The autopilot will disconnect and a warning will be sounded and illuminated on EICAS/ECAM.
The aircraft circles the waypoint until commanded to do otherwise.
The system reverts to heading mode.
The aircraft returns to the previous waypoint.
20. IRS is different from INS in that it?
It is not affected by vertical accelerations due to gravity, but it requires a longer spin-up time.
It requires no corrections for central accelerations or Coriolis effects.
It suffers laser lock but spins up faster.
Its strapped down accelerometers are not rotated with the aircraft and hence do not suffer schuler errors.
21. The fundamental difference between INS and IRS is that?
The INS is a strap down system with 3 accelerometers mounted at 90° to each other.
The INS is a strap down system with 2 accelerometers mounted at 90° to each other.
The IRS is a strap down system with 2 accelerometers mounted at 90° to each other.
The IRS is a strap down system with 3 accelerometers mounted at 90° to each other.
22. In order to align a strap-down inertial unit, it is required to insert the local geographical coordinates. This is necessary to?
Re-erect laser gyros.
determine magnetic or true heading.
Check operation of the laser gyros.
Position the computing trihedron with reference to the earth.
23. A cost index is?
A fixed code giving the best fuel efficiency for each aircraft type.
An FMS input code telling the FMS the required balance between optimising fuel costs and sector time.
A fixed code giving best fuel efficiency for each route.
An FMS output code.
24. The amber ALERT light on an INS control and display unit?
Flashes for 2 minutes before reaching the next waypoint.
Illuminates if power from the aircraft bus bar has been lost and the system is operating on standby battery.
Illuminates steadily after passing a waypoint in manual mode, until the next leg is programmed in.
Illuminates steadily for 2 minutes before reaching the next waypoint.
25. What is the Schuler period?
84 minutes.
84 seconds.
48 seconds.
48 minutes.
26. Modern systems employ ring laser gyros because they offer?
More rapid alignment.
More rapid run up.
Longer life.
Lower electrical power requirements.
27. Integration of a yaw rate signal?
Gives track.
Gives yaw displacement.
Gives heading.
Gives yaw acceleration rate.
28. An IRS with laser gyros should (i) ....... be Schuler tuned , and (ii) ...... be strapped down?
(i) never (ii) never.
(i) always (ii) never.
(i) always (ii) always.
(i) never (ii) always.
29. When using an INS platform Coriolis affects?
The N/S accelerometer.
Neither a, nor b.
Both a, and b.
The E/W accelerometer.
30. The errors of an INS fall into three categories?
Bounded, unbounded and inherent.
Coriolis, unbounded and inherent.
Bounded, unbounded and accelerometer.
Bounded, unbounded and velocity.
31.
The diagram below shows a gyro-stabilised platform . 1 is a........ gyro gimbal and 2 is a ...... gimbal?
Pitch Roll.
Pitch Roll.
Roll yaw.
Roll Pitch.
32. Where would a rate integrating gyro be used? 1. Turn and slip indicators. 2.Servo stabiliser mechanisms. 3. Autopilots. 4. Inertial attitude units 5. Inertial navigation units.
2, 4, 5.
4, 5
1, 2, 3, 4.
3, 4, 5
33. Why is the Inertial strapdown unit in an IRS programmed with coordinates during alignment?
To functionally test the ring laser gyroscopes.
To establish the trihedron with reference to the earth.
To establish magnetic north and true north.
To compensate for earth rotation errors.
34. Heading information given by a gyro platform is given by a gyro with?
3 degrees of freedom in the horizontal axis.
2 degrees of freedom in the vertical axis.
3 degrees of freedom in the vertical axis.
1 degrees of freedom in the horizontal axis.
35. In an INS a TAS input is ?
Required for great circle navigation.
Required in order to provide a wind velocity read out.
Required for polar navigation.
Not required.
36. An INS with the accelerometers aligned N/S and E/W is limited to use at latitudes below about 82°. This is because?
The functions of secant latitude and tangent latitude used in certain corrections in the computer start to approach infinity and the computer cannot handle the rapid changes involved.
At high speed on East or West tracks the rate of convergency is faster than the azimuth motor can correct.
It loses horizontal reference as dip becomes large.
The correction for the Coriolis effect of the earth rotation approaches infinity above 82° latitude.
37. The inputs to the FMS include? 1. Air data computer information 2. Route data. 3.Radio aids information. 4.Power pland data. 5.Operating data
1, 2, 3, 4, 5.
2, 3, 4, 5.
1, 2, 3, 4.
1, 3, 4, 5.
38. During initial alignment the IRS must be given coordinates to?
Establish the trihedron with reference to the earth.
Input initial heading information.
Establish true magnetic north.
Test the accuracy and serviceability of the laser ring gyros.
39. To obtain heading information from a gyro-stabilised platform, the gyros should be?
1 degree of freedom and a horizontal axis.
1 degrees of freedom and a vertical axis.
2 degree of freedom and a horizontal axis.
2 degree of freedom and a vertical axis.
40. At the second state of integration E/W speed is converted into E/W distance gone. To convert this departure into change of longitude it has to?
Be multiplied by the secant of latitude.
Be divided by the tangent of latitude.
Be divided by the secant of latitude.
Be multiplied by the Cosine of latitude.
41. Alignment of a RLG INS takes?
Less than 10 minutes.
15 to 20 minutes.
84.4 minutes.
10 to 15 minutes.
42. In an INS which is Schuler tuned , the largest unbounded errors are?
Due to the output of the first stage integrators.
Due to accelerometer errors.
Due to the real wander of the platform gyroscopes.
Track errors due to initial platform misalignment.
43. The control and display unit of an inertial navigation system indicates a position of 4810.9° N 00012.2° W on a ramp position 4807.5°N 00005.1°E. What is the radial error rate of the system if it has been in NAV mode for 8 hours 20 minutes?
1.37 Km/hr.
11.42 Nm/hr.
1.37 Nm/hr.
14.3 Nm/hr.
44. In an INS the gyros should ..... be strap down. In an IRS the gyros should ..... be strapped down?
never never
always never.
never always.
always always.
45. The flight control unit in an FMS?
Controls only heading.
Control all flight paths.
Control vertical flight paths
Controls lateral flight paths.
46. Ring laser gyros use dither motors to?
Level and align the gyros.
Prevent unbounded errors.
Reduce random wander.
Prevent lock in of the laser beams.
47. The position accuracy of an RLG INS is ?
1 nm/hr.
10 nm/hr.
2 nm/hr.
5 nm/hr.
48. Valid FMS CDU waypoint entries include? 1. Runway number 2. Navaid limitations. 3. Airport ICAO identifier. 4.Navaid identifier 5. Waypoint name 6. Country code
1, 3, 4, 5.
1, 4, 5, 6.
1, 2, 3, 4.
2, 3, 4, 6.
49. Why is an INS platform virtually unusable at very high latitudes?
The value of the earth rate affecting the E/W accelerometer is a component dependent on the sine lat. At high latitudes this component is nearly zero and makes alignment to true north virtually impossible.
The value of the earth rate affecting the E/W accelerometer is a component dependent on the cosine lat. At high latitudes this component is nearly zero and makes alignment to magnetic north virtually impossible.
The value of the earth rate affecting the E/W accelerometer is a component dependent on the cosine lat. At high latitudes this component is nearly zero and makes alignment to true north virtually impossible.
The value of the earth rate affecting the E/W accelerometer is a component dependent on the sine lat. At high latitudes this component is nearly zero and makes alignment to true magnetic virtually impossible.
50. The Inputs to an FMS Include? 1. Operating data. 2. Terminal data. 3. Air data 4. Route data 5.Engine data 6. Radio aids data.
2, 3, 4, 5.
All of the above.
1, 2, 3, 4.
3, 4, 5, 6.
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