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Worksheets

Instruments Gyroscopic - Gyroscopes

Total questions: 66

Worksheet time: 1hrs 6mins

Name
Class
Date
1.

The centre of gravity acting upon the spin axis is known as?

a)

Static balance

b)

Dynamic balance

c)

Gyroscopic precession

2.

The plane of spin acting at right angles to the axis of spin is known as?

a)

Static balance

b)

Dynamic balance

c)

Gyroscopic precession

3.

Where is the weight of a gyro concentrated to gain higher momentum and therefor stability?

a)

In the rim

b)

The centre

c)

Even across the whole structure

4.

The inertia of mass, keeping the axis rigid or pointing in the same direction is called?

a)

Rigidity

b)

Precession

c)

Dynamic balanc

5.

The angular momentum of a given body point remains constant unless some force is applied to change it is called?

a)

Conservation of angular momentum

b)

Gyroscopic rigidity

c)

Gyroscopic precession

6.

The spinning freedom about an axis perpendicular through its centre of spin is?

a)

X

b)

Y

c)

Z

7.

The tilting freedom about the horizontal axis at right angles to the spin axis of spin is?

a)

X

b)

Y

c)

Z

8.

The veering freedom about the vertical axis perpendicular to both the spin and tilt axes is the axis of veer

a)

X

b)

Y

c)

Z

9.

How do we prevent gimbal lock?

a)

Limiting the movement of the inner gimbal with mechanical stops

b)

Extending the movement of the inner gimbal with mechanical stops

c)

There is no way to prevent gimbal lock

10.

What degree are the stops set of max alignment for gimbal lock?

a)

85

b)

95

c)

90

11.

Out of control precession is called?

a)

Toppling

b)

Gimble lock

c)

Tilting

12.

A gyro having a complete freedom in three planes at right angles to each other, with two gimbals inner tilt and outer veer, is called?

a)

Free gyro

b)

Tied gyro

c)

Earth gyro

d)

Rate gyro

13.

A gyro having freedom in three planes at right angles to each other but controlled by some external force made to point in a desired direction is called?

a)

Free gyro

b)

Tied gyro

c)

Earth gyro

d)

Rate gyro

14.

A tied gyro controlled by gravity to maintain its position relative to the earth , the axis of spin points to the centre of the earth is called?

a)

Free gyro

b)

Tied gyro

c)

Earth gyro

d)

Rate gyro

15.

A tied gyro having one plane of freedom at right angles to the plane of rotation, and one gimbal so constructed as to measure rate of movement about the plane at right angles to both the plane of rotation and the plane of freedom is called?

a)

Free gyro

b)

Tied gyro

c)

Earth gyro

d)

Rate guro

16.

A unrestricted, unreferenced displacement gyro is called?

a)

Space gyro

b)

Tied gyro

c)

Rate gyro

17.

Which axis of freedom enables a gyroscopes rotor to spin?

a)

Spinning

b)

Tilting

c)

Veering

18.

Which axes of freedom does the gyro case or inner gimbal was free to rotate about the horizontal plane, at right angles to the spin axis?

a)

Spinning

b)

Tilting

c)

Veering

19.

Which axes of freedom does the outer gimbal free to rotate about the vertical plane, which is perpendicular to both the spin and tilt axes and the outer gimbal is supported in the frame or case of the gyro system?

a)

Spinning

b)

Tilting

c)

Veering

20.

Which gyro has two degrees of freedom it can measure?

a)

Two frame

b)

Three frame

c)

Four frame

21.

What allows the gyro to frame to move around the gyro while it maintains its original attitude and direction of spin axis?

a)

Gimbals

b)

Bearings

c)

Rotors

22.

What does not require a gimbal as this plane is simply the freedom of the rotor to spin on its axis?

a)

Gimbals

b)

Plane of spin

c)

Rotors

23.

Increasing the mass of the rotor, concentrating mass neat the rim of the rotor (increasing the radius of gyration) and increasing the rotor speed all increase?

a)

Rigidity

b)

Precession

c)

Dynamic balance

24.

The strength and direction of applied force, moment of inertia of the rotor and angular velocity are all factors which affect the rate of?

a)

Precession

b)

Rigidity

c)

Dynamic balance

25.

The axis which the torque is applied is the?

a)

Input axis

b)

Output axis

c)

Middle axis

26.

The axis which precession takes place at is the?

a)

Input axis

b)

Output axis

c)

Middle axis

27.

What should older gyros have done to them when aerobatic manoeuvres are to be carried out to avoid damaging the bearings?

a)

Caging

b)

30 minute run up

c)

Avoid old gyros when acrobatic flying

28.

What degree of nose up or down from level flight must be avoided to prevent tumbling?

a)

85

b)

75

c)

65

29.

How many degrees an hour would a frictionless space gyro turn from the earth's rotation?

a)

15

b)

20

c)

10

30.

The gyro spin axis being tied horizontal in respect to the indicator case and as such in parallel to the aircraft lateral and longitudinal axes is called?

a)

Case tied gyro

b)

Earth tied gyro

c)

Case tied free gyro

31.

A vertical gyro that is required to continuously be corrected to the vertical position in relation to the surface of the earth is called a?

a)

Case tied gyro

b)

Earth tied gyro

c)

Case tied free gyro

32.

DG's, AH's and Bank gyros are all termed?

a)

Tied gyros

b)

Rate gyros

c)

Displacement gyros

33.

Which characteristic establishes a stabilised reference unaffected by movement of the supporting body for a reference established gyroscope?

a)

Rigidity

b)

Precession

c)

Balance

34.

Which characteristic controls the effects of apparent and real drift thus maintaining stabilised reference datums for a reference established gyroscope?

a)

Rigidity

b)

Precession

c)

Balance

35.

Drift relates to which axis?

a)

Horizontal

b)

Vertical

c)

Diagonal

36.

If the gyro is not at the equator, what precession value can be used for apparent drift to eliminate the earth rate?

a)

15 sin λ

b)

15 cos λ

c)

15 tan λ

37.

When causing a gyroscope to be processed in the opposite direction to the earths rotation by placing weights in the spin axis of the gyro rotor to unbalance the unit so that the weight force causes the gyro to precess is called?

a)

Apparent drift compensation

b)

Control of drift

c)

Transport wander

38.

How is transport rate corrected?

a)

Reference to centre of earth

b)

Reference to equator

c)

Reference to North/South poles

39.

What is a result from imperfections in the manufacture of the gyroscope such as bearing friction or gimbal imbalances and can only be minimised by applying precision engineering techniques called?

a)

Real drift

b)

Apparent drift

c)

Transport wander

40.

Up to what degree of effectiveness is deliberately unbalancing the inner ring to control the earth rate error on a gyro?

a)

60 degrees latitude

b)

50 degrees latitude

c)

40 degrees latitude

41.

What are gimbal errors caused by?

a)

External forces

b)

Output from the sensing synchros

c)

Heading

42.

When an aircraft headings such that its longitudinal axis is aligned with the gyro's rotor axis, banking of the aircraft on a constant heading will produce?

a)

Gimbal error

b)

No gimbal error

c)

Incorrect readings

43.

Combining a pitch attitude change with an aircraft banking on a constant heading and the longitudinal axis aligned with the gyros rotor axis will cause?

a)

Gimbal error

b)

No gimbal error

c)

Incorrect readings

44.

If two pulses of light are sent in opposite direction around a stationary circular loop of radius R, they will travel the same distance at the same speed, so they arrive at the same end point simultaneously is called?

a)

Sagnac effect

b)

Coherent light

c)

Phase shift

45.

Fibre optic gyros can measure anywhere from?

a)

100m to 5KM

b)

50m to 1KM

c)

500m to 7KM

46.

The longer the path for a fibre optic signal the?

a)

More accurate

b)

Less accurate

c)

No effect

47.

Air driven gyroscope erection systems rely on which characteristic to move the spinning rotor back to a balanced or erect position?

a)

Precession

b)

Rigidity

c)

Dynamic balance

48.

Which air driven gyroscope erection system deflects air evenly across the plate and has no effect on the outer gimbal?

a)

Wedge plate

b)

Pendulous vane

c)

Rotor housing

49.

Which type of air driven gyroscope erection system ports the exhausted air through four ports located at right angles to each other to encourage the precession effect to balance it?

a)

Wedge plate

b)

Pendulous vane

c)

Dynamic balance

50.

Which mechanical gyro erection system uses hooks to capture balls moving around to apply precession force and in the vertical plane the mass of the balls in centred therefore no precession force is applied?

a)

Ball cage

b)

Rolling ball

c)

Torque ball

51.

Which mechanical gyro erection system incorporates a slotted disc with a ball free to travel inside the slot and the slot is driven at a uniform speed of 30 rpm?

a)

Ball cage

b)

Rolling ball

c)

Torque ball

52.

How is the pitch torque motor positioned in a torque motor?

a)

Between inner and outer gimbal

b)

Between outer gimbal and frame

c)

Between inner gimbal and frame

53.

How is the roll torque motor positioned in a torque motor?

a)

Between inner and outer gimbal

b)

Between outer gimbal and frame

c)

Between inner gimbal and frame

54.

When a gyroscope is in its normal vertical position, where does the mercury lie and which electrode is it in contact with?

a)

Centre of tube and in contact with only centre electrode

b)

Centre of tube and in contact with only left electrode

c)

Centre of tube and in contact with only right electrode

55.

What degree will a gyro rotor axis (from the vertical) cause the circuit to the torque motors to interrupt the gimbal system and never erect in a torque motor gyro?

a)

>10

b)

<10

c)

10

56.

What does the erection rate increase to when the fast erection switch is on?

a)

120 to 180 degrees per min

b)

100 to 160 degrees per min

c)

80 to 120 degrees per min

57.

What duration should you not operate the fast erection switch longer than in case it overheats the stator coils?

a)

15 seconds

b)

20 seconds

c)

25 seconds

58.

When is it appropriate in flight to depress the fast erection switch to prevent false indications of pitch and bank attitude?

a)

During straight and level flight

b)

At a steady bank angle

c)

Never switch on during flight, only on ground

59.

When is a permanent magnet used in a DC coil as in case for the correction for apparent drift?

a)

Constant correction force

b)

Sporadic correction force

c)

Temporary correction force

60.

How long does the electromagnet operate for after power has been applied?

a)

20 seconds

b)

10 seconds

c)

15 seconds

61.

How do you correct for erection error in erection systems?

a)

Apply torque to outer gimbal, precessing the inner

b)

Apply torque to inner gimbal, precessing the outer

c)

Apply torque to both inner and outer gimbal

62.

In acceleration, an AH can make a false reading of?

a)

Ascent

b)

Decent

c)

No effect

63.

Inclination of gyro spin axis, erection cut out, pitch-bank compensation are all factors which can prevent?

a)

Erection error

b)

Caging

c)

Erection cut out

64.

During a turn, the bank levelling switch is disconnected and its erection system is controlled by the pitch levelling switch. What force does the turn need to exceed a 10 degree turn to activate the switch?

a)

0.18g

b)

0.19g

c)

0.2g

65.

Following recovery from unusual attitude, an AH senses gravitational forces, the erection mechanism of caging will immediately begin to correct the precision errors at what rate?

a)

3-6 degrees per second

b)

6-9 degrees per second

c)

10-13 degrees per second

66.

What is the rotor speed of a turn and slip indicator?

a)

4,200 rpm

b)

3,200 rpm

c)

2,200 rpm