Results
Q1. In gyroscopic theory, the term ‘topple’ is defined as:
wander, real or apparent, in the vertical plane
Q2. Which instrument has a 2 rotation in the horizontal axis?
Artificial horizon

Q3. The indication shows: ( image )
Correct answer is – 30° port bank, level flight
Q4. If the turn and slip indicator shows needle right and ball left in a banked turn… corrective action is?
Skidding; push left pedal forward,
Q5. Which instrument uses a vertical gyroscope fined with a gravity erection device?
Artificial horizon,
Q6. A force applied to the spinning axis of a rotor is precessed:
through 90Degrees in the direction of spin of the rotor
Q7. The gimbal error of the directional gyro is due to the effect of?
Correct answer is – A bank or pitch attitude of the aircraft. Feedback – when the aircraft is pitching or rolling the gyro will start experiencing the precession force and read error. this error will get cancelled out once the aircraft level out.
Q8. During an acceleration phase at constant attitude, the resetting principle (correction mechanism or erector system) of the artificial horizon results in the horizon bar indicating a?
Correct answer is – Nose-up attitude.
Q9. Following a left engine failure the pilot… uses rudder to arrest yaw… wings held level… Turn and slip indicator shows?
Needle central and ball central
Q10. To maintain the spin axis of the directional gyro in the yawing plane?
An erection system is used.
Q11. For a rate one turn at 150 Kts the AOB must be?
22 degree
Q12. The output of a flux valve is initially:
An AC voltage that varies with heading.
Q13. The radius of a turn at rate 1, and TAS 360 kt is:
2 NM
Q14. A force is applied to deflect a gyroscope. If the rpm of the gyro is then doubled, the precession rate will:
decrease
Q15. An artificial horizon has………degrees of freedom, along the AXIS in ______ plane?
Correct answer is – Two; vertical. uses vertical axis earth gyro. maintains always local vertical to earth due to rigidity. it has two degrees of freedom 1.- Pitch: about the lateral axis of aircraft- freedom in the horizontal axis. 2. Roll: about longitudinal Axis of aircraft – horizontal axis. in __ horizontal axis . about __ vertical plane
Q16. An electrically driven artificial horizon has fewer errors during the take-off run because:
Correct answer is – it is less pendulous, has a higher rotor speed and a linear acceleration cut-out
Q17. The turn needle indicates……………….in a slightly banked turn?
Angular velocity about the vertical axis.
Q18. A directional gyro indicator is basically a:
Correct answer is – horizontal axis tied gyro
Q19. The gimbal ring of a turn co-ordinator is inclined at about 30° with respect to the aircraft’s longitudinal axis in order to:
make the gyro sensitive to banking of the aircraft as well as to turning
Q20. Coefficient A is corrected for
Correct answer is – Moving the compass housing around its vertical axis
Q21. Compared with a conventional gyro, a laser gyro?
Has a longer life cycle.
Q22. How many degrees of freedom and what is the spin axis of an attitude indicator?
Correct answer is – Local earth vertical; two degrees of freedom. Artificial Horizon has 2 degrees of freedom, one in roll and 1 in pitch. so when the aircraft is pitching or rolling then the gyro will remain vertical. controlled by local gravity
Q23. The heading information originating from the gyro-magnetic compass flux valve is sent to the:
Correct answer is – error detector
Q24. The heading information originating from the gyro-magnetic compass flux valve is sent to the?
Correct answer is – Error detector.
Q25. Transport wander when flying east at 300 Kts at 40 degrees south is?
4.2° per hour.
Q26. Which or the following properties are possessed by a standby artificial horizon? 1. Independent power supply. 2. Separate gyro ( Independent Gyro ) 3. Remote (external) gyro. 4. Used only in emergencies. 5. At least one per pilot in JAR 25 aircraft.
Correct answer is – 1,2.
Q27. A “Landing Compass”
Correct answer is – Is used to establish aircraft magnetic heading during a compass swing
Q28. When turning at constant bank angle the rate of turn is?
Determined by TAS.
Q29. The main advantage of electric gyros are:
high rpm, high moment of inertia, rapid build-up of speed, constant RPM
Q30. The rotor of an electric artificial horizon is driven by:
An AC motor.
Q31. The heading reading on the dial of a directional gyro is subject to errors, one of which is due to the movement of the aircraft. This error?
Correct answer is – Is dependent on the ground speed of the aircraft, its true track and the average latitude of the flight.
Q32. A flux valve senses the changes in orientation of the horizontal component of the earth’s magnetic field: 1 – the flux valve is made of a pair of soft iron bars 2 – the primary coils are fed AC voltage 3 – the information can be used by a “flux gate” compass or a directional gyro 4 – the flux gate valve casing is dependent on the aircraft three inertial axis 5 – the accuracy of the value of the magnetic field indication is less than 0.5% The combination of correct statements is:
Correct answer is – 2, 3 and 5
Q33. In a Remote Indicating Compass, the “Slaving” signal is generated by the:
Error Detector.
Q34. To prevent the electrical artificial horizon from toppling and showing pitch error during take off run:
The erection system is cut out by sensing acceleration.
Q35. Among the systematic errors of the “directional gyro”, the error due to the earth rotation make the north reference turn in the horizontal plane. At a mean latitude of 45° N, this reference turns by?
Correct answer is – 10.5°/hour to the right.
Q36. Rate of turn indications are:
Proportional to TAS.
Q37. The gyro-magnetic compass torque motor?
Correct answer is – Causes the directional gyro unit to precess.
Q38. When an aircraft has turned 90 degrees with a constant attitude and bank, the pilot observes the following on a classic artificial horizon?
Correct answer is – Too much nose-up and bank too low.
Q39. The latitude nut in an artificial horizon ———?
Correct answer is – Is not fitted to.
Q40. If the turn and slip indicator shows needle left and ball right in a banked turn… corrective action is?
Skidding; push right pedal forward.
Q41. The erection system of an electric artificial horizon typically consists of:
Torque motors and mercury switches.
Q42. The error in a directional gyro due to the earth’s rotation, at a mean latitude of 45°N, will cause the spin axis to move by:
Correct answer is – 10.6° clockwise
Q43. When the DGI caging knob is pushed in?
The rotorl is locked in yawing plane and the azimuth gear is connected to the knob for correction.
Q44. The yaw damper system, uses a.. proportional to…………….? and produces rudder inputs
Horizontal Axis rate gyro; yaw rate,
Q45. The errors of a DGI are: 1. earth rate 2. transport wander 3. banking when pitched up 4. annual movement of poles 5. mechanical problems
Correct answer is – 1, 2, 3, & 5
Q46. How will a basic AI respond if an aircraft performs a 270-degree turn at a constant bank angle and ROT?
Correct answer is – Nose up and bank.
Q47. The dither motor in a ring laser gyroscope?
Prevents laser lock.
Q48. For a coordinated rate 1 left turn at an AOB of 27 degrees, the TAS should be?
200 Kts.
Q49. When an aircraft has turned 360 degrees with a constant attitude and bank, the pilot observes the following on a classic artificial horizon?
Correct answer is – Attitude and bank correct.
Q50. A rate integrating gyro is used in: (Duplicate Variant 3)
an inertial navigation system
Q51. The Latitude Nut on a DGI is used to?
Induce a real wander to cancel out drift due to earth’s rotation.
Q52. To obtain heading information a gyro-stabilized platform requires?
A horizontal axis and one degree of freedom.
Q53. The rate-of-turn is the:
change-of-heading rate of the aircraft
Q54. Apparent wander drift of a directional gyro is zero?
At the equator.
Q55. The drift of the directional gyro due to earth rotation is?
15 deg/hour at the pole.
Q56. A directional gyro requires?
Two gimbals, two degrees of freedom and a horizontal spin axis,
Q57. The artificial horizon uses a … gyro?
tied
Q58. On a classic artificial horizon, pitch attitude is indicated by the position of the:
Miniature aircraft relative to the horizon bar.
Q59. If the turn indicator needle is out to the right and the ball is out to the left, it indicates?
A right turn with too little bank.
Q60. The measurement of the magnetic heading in a Remote Indicating Compass relies on the use of a:
Flux Valve.
Q61. What is the strength of the H component of the earth’s magnetic field (in micro tesla ) at the North pole?
Correct answer is – 0
Q62. The heading reference unit of a three-axis data generator is equipped with a gyro with?
Correct answer is – 2 degrees of freedom and horizontal spin axis.
Q63. A rate integrating gyro is used in: A rate integrating gyro is used in: 1. inertial attitude unit; 2. autopilot system; 3. stabilizer servomechanism system; 4. inertial navigation unit; 5. rate of turn indicator
1 & 4
Q64. The TBI shown below indicates: (Image: Needle Left / Ball Left)
a rate of turn to the left, slipping in
Q65. In a remote indicating compass system the amount of deviation caused by aircraft magnetism and electrical circuits may be minimised by:
Correct answer is – mounting the detector unit in the wingtip
Q66. The output of the flux valve is fed to the?
Correct answer is – Error detector.
Q67. The artificial horizon provides the pilot with information regarding:
Pitch and Roll.
Q68. The rotor of an air driven artificial horizon spins about a:
vertical axis and has 2 degrees of freedom
Q69. A directional gyro is: 1. A gyroscope free around two axis. 2. A gyroscope free around one axis. 3. Capable of self-orientation around an earth-tied direction. 4. Incapable of self-orientation around an earth-tied direction. The combination which regroups all the correct statements is?
Correct answer is – 1,4. Feedback – you have to manually correct it —- tied using knob
Q70. Apparent drift may be corrected in a DGI by:
Correct answer is – attaching a bias weight to the inner gimbal which makes the gyro Precess in azimuth in the opposite direction to apparent wander . Feedback – Don’t get confuse- —————- Due to spring the precession is in the “”same direction” as yaw”. but due to latitude nut precession is in “‘opposite direction “” of earth rate drift wander
Q71. Which of the following statements is true regarding the errors of a direct reading magnetic compass?
Acceleration errors are greatest on headings of 090 and 270 degrees.
Q72. Following 180° stabilized turn with a constant attitude and bank, the artificial horizon indicates?
Correct answer is – Too high pitch-up and correct banking.
Q73. The needle of the Turn and Bank indicator shows:
The rate at which the aircraft is turning about the yaw axis.
Q74. The number of degrees of freedom of a gyro is?
The same as the number of gimbals.
Q75. Errors of the directional gyro are:
Correct answer is – gimballing error, random wander, apparent wander, rotor speed error, transport wander
Q76. If the turn and slip indicator shows needle left and the ball left in a banked turn, the aircraft is………and the required corrective action is….?
Slipping; push left pedal forward.
Q77. During the take-off run an air-driven artificial horizon will usually indicate:
Correct answer is – increased nose-up attitude and right wing low
Q78. A vertical spin axis gyro , When viewed from above seen to rotate in Clockwise direction. If a force tends to push the right side downwards?
Correct answer is – It will tilt upwards at the front.
Q79. An electrical artificial horizon; the erection system?
Is a torque motor type.
Q80. When turning through 270° at constant AOB and pitch attitude, what will a classic artificial horizon indicate?
Correct answer is – Too much nose up and too much bank angle.
Q81. Inside an artificial horizon:
Correct answer is – the inner gimbal ring is pivoted laterally inside the outer gimbal ring and the outer gimbal ring is pivoted longitudinally inside the case
Q82. What is the maximum gyro drift rate that can be caused by earth rotation?
15° per hour.
Q83. Apparent wander of a gyro can be caused by:
rotation of the earth
Q84. The gyro in a turn indicator must have…..gimbal…and……..degrees of freedom?
One; one.
Q85. In an air driven artificial horizon, the air comes from:
The vacuum pump.
Q86. The erection system of an air driven artificial horizon consists of:
Pendulous vanes and air jets.
Q87. A gyro-magnetic compass or magnetic heading reference unit is an assembly which always consists of: 1 – a directional gyro 2 – a vertical axis gyro 3 – an earth’s magnetic field detector 4 – an azimuth control 5 – a synchronizing control The combination of correct statements is:
Correct answer is – 1, 3 and 5
Q88. If both the ball and needle are out to the left in a turn, the ball can be centralized by?
Increasing TAS.
Q89. The directive force acting on a compass needle in an aircraft
Correct answer is – Is the resultant magnetic force in the horizontal plane in the position where the compass is installed
Q90. The purpose of the torque motor in a gyro stabilised magnetic compass is to?
Correct answer is – Precess the directional gyro.
Q91. The formula used to calculate apparent wander of a directional gyro in the northern hemisphere is:
Correct answer is – (- 15 sine latitude in degrees per hour)
Q92. False right wing low attitude shown on an air-driven artificial horizon during acceleration is caused by:
Correct answer is –the lag of the base of the rotor housing
Q93. The latitude nut of a directional gyro is used to?
Correct for apparent wander due to earth’s rotation.
Q94. An airborne instrument, equipped with a gyro with 2 degrees of freedom and a horizontal spin axis is?
A directional gyro.
Q95. When an aircraft is decelerating, the artificial horizon will indicate:
A descent and a turn to the left.
Q96. An air-driven DGI is corrected for an apparent wander at 56°N. If the aircraft is maintaining constant DGI readings:
Correct answer is – when flying south from 56°N the true heading will decrease Feedback – gyro is compensated for apparent wander at 56°N. in east west at 56 N – no error flying north form set latitude – ( -ve ) – under read – True heading increase. flying south from set latitude – ( +ve ) over read – true decrease.
Q97. Rate of turn depends upon : (1) bank angle (2) aeroplane speed (3) aeroplane weight
1,2.
Q98. Transport wander when flying east at 400 Kts at 45 degrees north is?
-6.67° per hour.
Q99. Calculated angle of bank is 19.5 degree to conduct a balanced rate 1 turn in an aircraft at 125 kts TAS at a mass of 55000 Kg? If the mass was decreased to 45000 Kg?
It would not affect the required AOB, but less power would be required.
Q100. In a typical remote reading compass, the gyro is kept aligned with the magnetic meridian by means of
Correct answer is – A torque motor