Results
Q1. **The ball in a serviceable slip indicator is…………by………… and…………Indicates the state of slip?
Correct answer is – Positioned; Acceleration; Does not always.
Q2. ***False nose-up attitude displayed on the air-driven artificial horizon during the take-off run is caused by:
Correct answer is – the lag of the lateral pendulous vanes
Q3. **The rotor axis of an electrical horizon is tied to the earth’s vertical by:
Correct answer is – two mercury level switches and two torque motors
Q4. The position accuracy of an RLG ( Ring LASER Gyro) INS is?
Correct answer is – 2 nm/hr.
Q5. If the turn and slip indicator shows needle left and ball right in a banked turn, the aircraft is…..and the required corrective action is…..?
Correct answer is – Skidding; push right pedal forward.
Q6. ***If the aircraft is making a right turn with the angle of Bank 20 degree and TAS 200kts. What will be the indication of Turn and slip indicator?
Correct answer is – A right turn with too little bank.
Q7. ***The turn needle indicates…………in a slightly banked turn?
Correct answer is – Angular velocity about the vertical axis.
Q8. **When both the needle and ball of a turn and slip indicator are displaced to the right the aircraft is?
Correct answer is – Turning right with insufficient TAS.
Q9. Where would a rate integrating gyro be used? 1. inertial attitude unit 2. autopilot system 3. stabilizer servomechanism system 4. inertial navigation unit 5. rate of turn indicator
Correct answer is – 1,4.
Q10. **The gimbal ring of a turn co-ordinator is inclined at about 30° with respect to the aircraft’s longitudinal axis in order to:
Correct answer is – make the gyro sensitive to banking of the aircraft as well as to turning
Q11. **The properties of a gyro are: 1. mass 2. rigidity 3. inertia 4. precession 5. rotational speed
Correct answer is – 2 & 4
Q12. ## 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
Q13. ***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…………?
Correct answer is – Slipping; push left pedal forward.
Q14. # A rate integrating gyroscope is used in: i. inertial attitude system ii. automatic flight control systems iii. inertial navigation systems iv. rate of turn indicators
Correct answer is – i & iii
Q15. Error detector generates an error signal which goes to amplifier for amplification and Amplifier gives ________
Correct answer is – DC output
Q16. Transport wander when flying west at 300 Kts at 25 degrees south is?
Correct answer is – -2.33° per hour.
Q17. ***To obtain heading information from a gyro-stabilised platform, the gyro should be?
Correct answer is – 1 degree of freedom and a horizontal axis.
Q18. The properties of a turn indicator are: 1. one degree of freedom 2. two degrees of freedom 3. two springs connected to the outer gimbal 4. spin axis in the longitudinal plane 5. spin axis parallel to the yaw axis 6. spin axis horizontal
Correct answer is – 1 & 6
Q19. ## For an aircraft flying a true track of 360° between the 005° S and 005° N parallels. the precession error of the directional gyro due to apparent drift is equal to?
Correct answer is – 0°/hour.
Q20. When turning through 90° at constant AOB and pitch attitude, what will a classic artificial horizon indicate?
Correct answer is – Too much nose up and too little bank angle.
Q21. The heading information originating from the gyro-magnetic compass flux valve is sent to the?
Correct answer is – Error detector.
Q22. The gimbal error of the directional gyro is due to the effect of?
Correct answer is – A bank or pitch attitude of the aircraft.
Q23. ## A force applied to the spinning axis of a rotor is precessed:
Correct answer is – through 90° in the direction of spin of the rotor
Q24. ## A standby artificial horizon must have the following properties: 1. a remote gyro 2. its own power supply 3. only to be used in emergency 4. its own gyro 5. one for each certified pilot
Correct answer is – 2 & 4
Q25. If an aircraft turning left with rate 1 turn indiacted but the ball is to the left .
Correct answer is – the aircraft is turning left at less than 3°/second.
Q26. **What will a classic artificial horizon indicate when turning through 90 degrees at the constant attitude and bank angle?
Correct answer is – Too little bank and too much nose up attitude.
Q27. 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?
Correct answer is – With damping and a period of about 84 minutes.
Q28. The radius of a turn at rate 1, and TAS 360 kt is:
Correct answer is – 2 NM
Q29. In order to align a strap-down inertial unit, it is required to insert the local geographical coordinates. This is necessary to?
Correct answer is – Position the computing trihedron with reference to the earth.
Q30. An airborne instrument, equipped with a gyro with 2 degrees of freedom and a horizontal spin axis is?
Correct answer is – A directional gyro.
Q31. A ring laser gyro consists of:
Correct answer is – a laser split into two beams
Q32. ## The correct indications when taxiing to the left are?
Correct answer is – Needle left, ball right.
Q33. **In an IRS system?
Correct answer is – Both the platform and accelerometers are strapped down.
Q34. ***The building principle of a gyroscope, the best efficiency is obtained through the concentration of the mass?
Correct answer is – On the periphery and with a high rotation speed.
Q35. **To obtain heading information a gyro-stabilized platform requires?
Correct answer is – A horizontal axis and one degree of freedom.
Q36. What angle of bank is required to conduct a balanced rate 1 turn in an aircraft at 125 kts TAS at a mass of 55000 Kg?
Correct answer is – 19.5 degrees.
Q37. ## 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
Q38. **The spin axis of a directional gyro is maintained in …… by means of …… in an air driven gyro and by means of a …… in an electrically driven gyro.
Correct answer is – the yawing plane; air jets; torque motor
Q39. Apparent Drift Due to Earth rate at the equator is?
Correct answer is – zero.
Q40. *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
Q41. Which or the following properties are possessed by a standby artificial horizon? 1. Independent power supply. 2. Integral separate 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.
Q42. For a coordinated rate 1 right turn at 250 Kts TAS, the correct AOB is Approximate?
Correct answer is – 32 degrees.
Q43. *** 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
Correct answer is – 1 & 4
Q44. **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
Q45. ## 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.
Q46. #When both the needle and ball of a turn and slip indicator are displaced to the right the aircraft is?
Correct answer is – Turning right with too much bank.
Q47. **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.
Q48. ## If an aircraft turns through 270° at a constant rate of turn and AOB, the indication on its classic artificial horizon will be?
Correct answer is – Bank right nose up.
Q49. ## Real wander of a gyro can be caused by:
Correct answer is – asymmetrical friction at the spinning axis
Q50. ***In an INS the E/W accelerations are converted into an E/W speed (kt) at the first stage of integration and into E/W distance gone (NM) at the second stage of integration. This gives:
Correct answer is – departure which is multiplied by secant of the present latitude to obtain d’long (min) which is used to automatically update the present longitude
Q51. *****The errors of an INS fall into three categories?
Correct answer is – Bounded, unbounded and inherent.
Q52. ***The gravity sensing unit in an artificial horizon is used to?
Correct answer is – Prevent tilting of the gyro.
Q53. ## When an adjustable aircraft datum is fitted to an artificial horizon in flight aircraft:
Correct answer is – it should be set to the central position and left there
Q54. ## The fundamental difference between INS and IRS is that?
Correct answer is – The IRS is a strap down system with 3 accelerometers mounted at 90° to each other.
Q55. 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?
Correct answer is – It would not affect the required AOB, but less power would be required.
Q56. Why must latitude and longitude be inserted into an IRS?
Correct answer is – To determine the aircraft position relative to the earth
Q57. #Alignment of a RLG INS takes?
Correct answer is – Less than 10 minutes.
Q58. Under normal operating conditions, when an aircraft is in a banked turn, the rate-of-turn indicator is a valuable gyroscopic flight control instrument. when it is associated with an attitude indicator it indicates: 1. the angular velocity of the aircraft about the yaw axis 2. the bank of the aircraft 3. the direction of the aircraft turn 4. the angular velocity of the aircraft true vertical/real vertical
Correct answer is – 1,3.
Q59. ## turn indicator has? 1. A horizontal spin axis. 2. A vertical spin axis. 3. One degree of freedom. 4. Two degrees of freedom. 5. A spin axis tied to the yawing plane of the aircraft. 6. A gravity erecting unit.
Correct answer is – 3,5.
Q60. The yaw damper system, uses a ………… and produces rudder inputs proportional to…………?
Correct answer is – Horizontal Axis rate gyro ; yaw rate.
Q61. ## 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
Q62. ***Rate of turn indications are:
Correct answer is – Proportional to TAS.
Q63. **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
Q64. ## In a turn indicator, the measurement of rate of turn consists for:
Correct answer is – low bank angle, in measuring the yaw rate
Q65. ***Following a left engine failure the pilot of a multi-engine aircraft uses the rudder to arrest the yaw, whilst side slipping down the track with the wings held level by the ailerons. What will the turn and slip indicator show in this condition?
Correct answer is – Both needle and ball central.
Q66. ## The rigidity of a gyroscope depends on:
Correct answer is – mass, radius of gyration and speed of rotation
Q67. The vertical reference unit of a three-axis data generator is equipped with a gyro with:
Correct answer is – vertical axis with 2 degree of freedom
Q68. The rate-of-turn is the:
Correct answer is – change-of-heading rate of the aircraft
Q69. A 2 axis gyro measuring vertical changes will have? ______1. One degree of freedom. ______2. Two degrees of freedom. ______3. Vertical axis. ______4. Horizontal axis.
Correct answer is – 2,3.
Q70. Rigidity increases with?
Correct answer is – Increasing RPM and concentrating mass at the periphery.
Q71. #Gimballing error:
Correct answer is – will disappear after a turn is completed
Q72. **When the pointer of a rate of turn indicator shows a steady rate of turn:
Correct answer is – the spring is providing a force which produces a precession equal to the rate of turn (in the correct direction)
Q73. How many degrees of freedom and what spin axis will a gyro measuring vertical changes use?
Correct answer is – 2; Vertical.
Q74. What is the maximum gyro drift rate that can be caused by earth rotation?
Correct answer is – 15° per hour.
Q75. A directional gyro indicator is basically a:
Correct answer is – horizontal axis tied gyro
Q76. In an INS a TAS input is?
Correct answer is – Required in order to provide a wind velocity read out.
Q77. ***The dither motor in a ring laser gyroscope?
Correct answer is – Prevents laser lock.
Q78. Setting zero cost index on an FMS gives?
Correct answer is – Best range.
Q79. When initial position is put into an INS system?
Correct answer is – It rejects initial latitude errors, but accepts initial longitude errors.
Q80. **INS errors are classified as “bounded errors” and “unbounded errors”.
Correct answer is – An “unbounded error” is an error that increases with time, an example being the distance gone error due to a ground speed error
Q81. **In gyroscopic theory, the term ‘topple’ is defined as:
Correct answer is – wander, real or apparent, in the vertical plane
Q82. A turn coordinator has (i)………… pivoted (ii)………… in the case.
Correct answer is – a single gimbal ring; longitudinally
Q83. Apparent wander of a gyro can be caused by:
Correct answer is – rotation of the earth
Q84. The product of the first integration of the E/W acceleration sensed by an INS system is?
Correct answer is – Speed along the local parallel.
Q85. *The purpose of the torque motor in a gyro stabilized magnetic compass is o/
Correct answer is – Precesses the directional gyro.
Q86. The directional gyro axis spins about the local vertical by 15°/hour?
Correct answer is – On the North pole.
Q87. A turn indicator is an instrument which indicates rate of turn. Rate of turn depends upon: 1 : bank angle 2 : aeroplane speed 3 : aeroplane weight The combination regrouping the correct statements is :
Correct answer is – 1,2.
Q88. What will be the apparent wander on gyroscope when flying on a northerly track from 05° S to 05° N.
Correct answer is – Zero
Q89. **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
Q90. ### A directional gyro is valid only for a short period of time. The causes of this are: 1. earth rotation 2. longitudinal accelerations 3. a/c motion over the earth 4. mechanical defects 5. gyro mass
Correct answer is – 1, 3 & 4
Q91. *The main advantage of electric gyros are:
Correct answer is – high rpm, high moment of inertia, rapid build-up of speed, constant RPM
Q92. ## 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
Q93. **If the filter of the air-driven rate of turn indicator becomes partially blocked:
Correct answer is – the rate of turn will be more than indicated
Q94. The heading information originating from the gyro-magnetic compass flux valve is sent to the:
Correct answer is – error detector
Q95. ## Dither is used in a laser gyro in order to:
Correct answer is – break the frequency lock which would prevent small rotational rates from being sensed by the gyro
Q96. 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.
Q97. 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.
Q98. The correct latitude must be put into INS?
Correct answer is – Because small latitude errors will not be detected but will cause unbounded errors during the subsequent flight.
Q99. ## A force is applied to deflect a gyroscope. If the rpm of the gyro is then doubled, the precession rate will:
Correct answer is – decrease
Q100. **The triangular cavity in a RLG is filled with which combination of gasses?
Correct answer is – Helium and neon.
Q101. What angle of bank is required to conduct a balanced rate 1 turn in an aircraft at 180 kts TAS?
Correct answer is – 25°
Q102. ## The spin axis of a free gyro:
Correct answer is – Remains fixed in space
Q103. **Which instrument is fitted with an acceleration error cut-out?
Correct answer is – The artificial horizon
Q104. The apparent wander of a directional gyro is?
Correct answer is – Maximum at the poles
Q105. If the turn indicator shows a left turn and the ball is to the right, the aircraft is?
Correct answer is – Slipping to the left
Q106. ## What is the function of an amplifier in a gyro magnetic compass system?
Correct answer is – To increase the current of the signal from the detector
Q107. ## For an aircraft flying a true track of 000° between the 30° N and 30° S parallels. the precession error of the directional gyro due to relative motion of earth is equal to?
Correct answer is – 0°/hour
Q108. ## For an aircraft flying a true track of 090° in the northern hemisphere. the precession error of the directional gyro due to apparent drift is ?
Correct answer is – Depends on the latitude.
Q109. **Which of the following instruments uses a rate gyro?
Correct answer is – Turn indicator
Q110. **Which of the following instruments uses a free gyro?
Correct answer is – Directional gyro
Q111. **Which of the following instruments uses a rate integrating gyro?
Correct answer is – Inertial navigation system