Vayudoot Aviation

1. A directional gyro requires?

Three gimbals, three degrees of freedom and a lateral spin axis.

One gimbal, one degree of freedom and horizontal spin axis.

One gimbal, one degree of freedom and a vertical spin axis.

Two gimabls, two degrees of freedom and a horizontal spin axis.

2. 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 about the real vertical. The combination of correct statements is?

2, 4.

1, 2.

1, 3.

3, 4.

3. Transport wander when flying west at 300 Kts at 25 degrees south is?

3.34° per hour.

-2.33° per hour.

-3.34° per hour.

2.33° per hour.

4. The heading information originating from the gyro-magnetic compass flux value is sent to the?

Amplifler.

Erector system.

Heading indicator.

Error detector.

5. When, in flight, the needle of a needle and ball indicator is on the left and the ball on the right, the aircraft is?

Turning left with too much bank.

Turning right with not enough bank.

Turning right with too much bank.

Turning left with not enough bank.

6. An airborne instrument, equipped with a gyro with 2 degrees of freedom and a horizontal spin axis is?

A fluxgate compass.

A directional gyro.

An artificial horizon.

A turn indicator.

7. 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

1, 4.

1, 3.

2, 4.

2, 3.

8.
The diagram which shows a 40° left bank and 15° nose down attitude is?

2.

3.

1.

4.

9. A gravity erector system is used to correct errors in?

A ROT Indicator.

An artificial horizon.

A DGI.

An inertial platform.

10. The number of degrees of freedom of a gyro is?

Not related to the number of gimbals.

The same as the number of gimbals.

One more than the number of gimbals.

One less than the number of gimbals.

11. The purpose of the torque motor in a gyro stabilised magnetic compass is to?

Preccess the directional gyro.

Move the selsyn stator or calibrate the compass.

Remove flux valve errors.

Align the heading pointer with true heading prior to flight.

12. Note: in this question, the degrees of freedom of a gyro are determined by the number of gimbal rings it comprises. Among the flight control instruments, the artificial horizon plays an essential part. It uses a gyroscope with?

Two degrees of freedom, whose axis is oriented and continuously maintained to local vertical by an automatic erecting system.

One degree of freedom, whose horizontal axis is maintained in a horizontal plane by an automatic erecting system.

Two degrees of freedom, whose horizontal axis corresponding to a reference direction is maintained in a horizontal plane by an automatic erecting system.

One degree of freedom, whose vertical axis oriented in the direction of the real vertical to the location is maintained in this direction by an automatic erecting system.

13. 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 of the correct statements is?

1, 3.

2, 3.

2, 4.

1, 4.

14. The charcteristics of he directional gyro (DG) used in a gyro stabilised compass system are?

Two degress of freedom, whose axis aligned with the vertical to the location is maintained in this direction by an erecting system.

One degree of freedom, whose horizontal axis is maintained in the horizontal plane by an automatic erecting system.

One degree of fredom, whose vertical axis, aligned with the real vertical to the location is maintained in this direction by an automatic erecting system.

Two degress of freedom, whose horizontal axis corresponding to the reference direction is maintained in the horizontal plane by an automatic erecting system.

15. What error is caused by movement of the gyro relative to the earth in a DGI?

Longitude latitude error.

Earth rate.

Transport wander.

Real wander.

16. Transport wander when flying west at 300 Kts at 25 degrees north is?

2.33° per hour.

-3.34° per hour.

3.34° per hour.

-2.33° per hour.

17. A DGI has ______ degrees of freedom and a _______ spin axis?

1 vertical.

2 horizontal.

3 horizontal.

2 vertical

18. When an aircraft has turned 90 degrees with a constant attitude and bank, the pilot observes the following on a classic artificial horizon?

Attitude and bank correct.

Too much nose-up and bank too low.

Too much nose-up and bank too high.

Too much nose-up and bank correct.

19. In a turn at constant rate, the turn indicator reading is?

Independent to the aircraft true airspeed.

Proportional to the aircraft true airspeed.

Proportional to the aircraft weight.

Inversely proportional to the aircraft true airspeed.

20. Which instrument employs a gravity erecting device on its gyro?

Artificial horizon.

Turn indicator.

ASI.

Directional gyro unit.

21. On the ground, during a left turn, the turn indicator indicates?

Needle in the middle, ball to the left.

Needle in the middle, ball to the righ.

Needle to the left, ball to the right.

Needle to the left ball to the left.

22. The properties of a gyro are? 1. Mass. 2. Rigidity in space. 3. Inertia. 4. Precession . 5. Rigidity with reference to the earth

1, 3, 4, 5.

2, 3, 4, 5.

1, 2, 3, 4.

1, 2, 3, 5.

23. The gyro in an artificial horizon requires.1. One degree of freedom. 2.Two degrees of freedom. 3. Vertical axis. 4. Horizontal axis

2, 4.

1, 4.

1, 3.

2, 3.

24. A Standby horizon or emergency attitude indicator?

Contains its own separate gyro.

Only works of there is a complete electrical failure.

Is automatically connected to the primary vertical gyro if the alternator fails.

Is fully independent of external energy resources in an emergency situation.

25. A slaved directional gyro derives it's directional signal from?

The air-data-computer.

A direct reading magnetic compass.

The flight director.

The flux valve.

26. Heading information given by a gyro platform, is given by a gyro at?

2 degrees-of-freedom in the horizontal axis.

1 degree-of-freedom in the horizontal axis.

1 degree-of-freedom in the vertical axis.

2 degrees-of-freedom in the vertical axis.

27. Earth rate at 25 degrees south is?

6.34° per hour.

-6.34° per hour.

-13.59° per hour.

13.59° per hour.

28. The gimbal error of the directional gyro is due to the effect of?

The aircraft's track over the earth.

A bank or pitch attitude of the aircraft.

Too slow precession on the horizontal gimbal ring.

An apparent weight ad an apparent vertical.

29. Compared with a conventional gyro, a laser gyro?

Has a longer life cycle.

Has a fairly long starting cycle.

Consumes a lot of power.

Is influenced by temperature.

30. Rigidity Increases with?

Increasing RPM and spin axis length.

Increasing RPM, and concentrating mass close to the centre.

Increasing RPM and concentrating mass at the periphery.

Decreasing RPM and radius.

31. When an aircraft has turned 270 degrees with a constant attitude and bank, the pilot observes the following on a classic artificial horizon?

Too much nose-up and bank too high.

Too much nose-up and bank too low.

Too much nose-up and bank correct.

Attitude and bank correct.

32. The yaw damper system, uses a __________ gyro and produces rudder Inputs proportional to_________?

Horizontal rate yaw rate.

Vertical rate yaw and roll.

Horizontal displacement yaw rate.

Vertical displacement roll rate.

33. The properties unique to a gyro include? 1.Mass. 2.Inertia. 3.Rigidity. 4. Precession. 5. Rotational velocity.

2, 3.

3, 4.

1, 2.

34. Where would a rate integrating gyro be used? 1. Rate of turn indicator. 2. Autopilot. 3.Inertial navigation unit. 4.Inertial attitude reference unit. 5.As a stabiliser for an instrumer inertial platform

2, 3.

3, 4.

4, 5.

1, 2.

35. Which instrument uses a vertical gyroscope fitted with a gravity erection device?

Rate gyro.

DGI

Artificial horizon.

Turn indicator.

36. The dither motor in a ring laser gyroscope?

Prevents laser lock.

Stabilises the frequency or the laser source.

Increases accuracy at all rotation rates.

Prevents or minimises transport wander.

37.
The diagram below shows three gyro assemblies: A, B and C. Among these gyros, One is a roll gyro (noted 1). One is a pitch gyro (noted 2). One is a yaw gyro (noted 3) The correct matching of gyros and assemblies is?

1B, 2C, 3A.

1B, 2A, 3C.

1A, 2B, 3C.

1C, 2A, 3B.

38. The vertical reference unit of a three-axis data generator is equipped with a gyro with?

1 degree of freedom and vertical spin axis.

2 degrees of freedom and vertical spin axis.

2 degrees of freedom and horizontal spin axis.

1 degree of freedom and horizontal spin axis.

39. The rate-of -turn is the?

Yaw rate in a turn aircraft.

Pitch rate in a turn.

Speed in a turn.

Change-of-heading rate of the aircraft.

40. The gyro in DGI has. 1. One degree of freedom. 2. Two degrees of freedom. 3. Vertical axis. 4. Horizontal axis

1, 4.

2, 4.

2, 3.

1, 3.

41. The indications of the directional gyro when used as an on-board instrument are valid only for a short period of time. The causes of this inaccuracy are? 1. The earth's rotation. 2. The longitudinal acceleration. 3. The aircraft's motion over the surface of the earth. 4. The mechanical defects of the gyro. 5. The gimbal mount of the gyro rings. The combination of correct statements is?

1, 3, 4.

2, 5, 6.

1, 3, 4, 6.

1, 2, 3, 4, 5, 6.

42. At a low bank angle, the measurement of rate-of-turn actually consists in measuring the?

Angular velocity of the aircraft.

Pitch rate of the aircraft.

Yaw rate of the aircraft.

Roll rate of the aircraft.

43. Integrating gyroscopes are used? 1. Attitude indicators. 2. Inertial attitude units. 3. Rate of turn indicators. 4. Inertial navigation platforms. 5. Autopilots.

2 and 4.

2, 3, and 5.

3 and 4.

4 and 5.

44. The maximum directional gyro error due to the earth rotation is?

5°/hour.

90°/hour.

15°/hour.

180°/hour.

45. To Indicate true heading, the gyros in a gyro stabilised platform require? 1. One degree of freedom. 2. Two degrees of freedom. 3. Vertical axis. 4. Horizontal axis.

1, 4.

2, 4.

2, 3.

1, 3.

46. Following 180° stabilized turn with a constant attitude and bank, the artificial horizon indicates?

Attitude and banking correct.

Too high pitch-up and too low banking.

Too high pitch up and too high banking.

Too high pitch-up and correct baning.

47. For an aircraft flying a true track of 390° between the 005°S and 005°N parallels, the precession error of the directional gyro due to apparent drift is equal to?

Depends only on the aircraft's ground speed.

-5°/hour.

0°/hour.

+5°/hour.

48. During an acceleration phase at constant attitude, the resetting principle of the artificial horizon results in the horizon bar indicating a?

Nose-down attitude.

Nose-down followed by a nose-up attitude.

Nose-up attitude.

Constant attitude.

49. To obtain heading information a gyro-stabilised platform requires?

A horizontal axis and one degree of freedom.

A vertical axis and two degrees of freedom.

A lateral axis and two degrees of freedom.

A vertical axis and one degree of freedom.

50. The directional gyro axis spins about the local vertical by 15°/hour?

On the North pole.

On the equator.

In the latitude 30°.

In the latitude 45°.

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