WorksheetsInstruments Gyroscopic - Gyroscopes
Total questions: 66
Worksheet time: 1hrs 6mins
The centre of gravity acting upon the spin axis is known as?
Static balance
Dynamic balance
Gyroscopic precession
The plane of spin acting at right angles to the axis of spin is known as?
Static balance
Dynamic balance
Gyroscopic precession
Where is the weight of a gyro concentrated to gain higher momentum and therefor stability?
In the rim
The centre
Even across the whole structure
The inertia of mass, keeping the axis rigid or pointing in the same direction is called?
Rigidity
Precession
Dynamic balanc
The angular momentum of a given body point remains constant unless some force is applied to change it is called?
Conservation of angular momentum
Gyroscopic rigidity
Gyroscopic precession
The spinning freedom about an axis perpendicular through its centre of spin is?
X
Y
Z
The tilting freedom about the horizontal axis at right angles to the spin axis of spin is?
X
Y
Z
The veering freedom about the vertical axis perpendicular to both the spin and tilt axes is the axis of veer
X
Y
Z
How do we prevent gimbal lock?
Limiting the movement of the inner gimbal with mechanical stops
Extending the movement of the inner gimbal with mechanical stops
There is no way to prevent gimbal lock
What degree are the stops set of max alignment for gimbal lock?
85
95
90
Out of control precession is called?
Toppling
Gimble lock
Tilting
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?
Free gyro
Tied gyro
Earth gyro
Rate gyro
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?
Free gyro
Tied gyro
Earth gyro
Rate gyro
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?
Free gyro
Tied gyro
Earth gyro
Rate gyro
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?
Free gyro
Tied gyro
Earth gyro
Rate guro
A unrestricted, unreferenced displacement gyro is called?
Space gyro
Tied gyro
Rate gyro
Which axis of freedom enables a gyroscopes rotor to spin?
Spinning
Tilting
Veering
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?
Spinning
Tilting
Veering
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?
Spinning
Tilting
Veering
Which gyro has two degrees of freedom it can measure?
Two frame
Three frame
Four frame
What allows the gyro to frame to move around the gyro while it maintains its original attitude and direction of spin axis?
Gimbals
Bearings
Rotors
What does not require a gimbal as this plane is simply the freedom of the rotor to spin on its axis?
Gimbals
Plane of spin
Rotors
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?
Rigidity
Precession
Dynamic balance
The strength and direction of applied force, moment of inertia of the rotor and angular velocity are all factors which affect the rate of?
Precession
Rigidity
Dynamic balance
The axis which the torque is applied is the?
Input axis
Output axis
Middle axis
The axis which precession takes place at is the?
Input axis
Output axis
Middle axis
What should older gyros have done to them when aerobatic manoeuvres are to be carried out to avoid damaging the bearings?
Caging
30 minute run up
Avoid old gyros when acrobatic flying
What degree of nose up or down from level flight must be avoided to prevent tumbling?
85
75
65
How many degrees an hour would a frictionless space gyro turn from the earth's rotation?
15
20
10
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?
Case tied gyro
Earth tied gyro
Case tied free gyro
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?
Case tied gyro
Earth tied gyro
Case tied free gyro
DG's, AH's and Bank gyros are all termed?
Tied gyros
Rate gyros
Displacement gyros
Which characteristic establishes a stabilised reference unaffected by movement of the supporting body for a reference established gyroscope?
Rigidity
Precession
Balance
Which characteristic controls the effects of apparent and real drift thus maintaining stabilised reference datums for a reference established gyroscope?
Rigidity
Precession
Balance
Drift relates to which axis?
Horizontal
Vertical
Diagonal
If the gyro is not at the equator, what precession value can be used for apparent drift to eliminate the earth rate?
15 sin λ
15 cos λ
15 tan λ
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?
Apparent drift compensation
Control of drift
Transport wander
How is transport rate corrected?
Reference to centre of earth
Reference to equator
Reference to North/South poles
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?
Real drift
Apparent drift
Transport wander
Up to what degree of effectiveness is deliberately unbalancing the inner ring to control the earth rate error on a gyro?
60 degrees latitude
50 degrees latitude
40 degrees latitude
What are gimbal errors caused by?
External forces
Output from the sensing synchros
Heading
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?
Gimbal error
No gimbal error
Incorrect readings
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?
Gimbal error
No gimbal error
Incorrect readings
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?
Sagnac effect
Coherent light
Phase shift
Fibre optic gyros can measure anywhere from?
100m to 5KM
50m to 1KM
500m to 7KM
The longer the path for a fibre optic signal the?
More accurate
Less accurate
No effect
Air driven gyroscope erection systems rely on which characteristic to move the spinning rotor back to a balanced or erect position?
Precession
Rigidity
Dynamic balance
Which air driven gyroscope erection system deflects air evenly across the plate and has no effect on the outer gimbal?
Wedge plate
Pendulous vane
Rotor housing
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?
Wedge plate
Pendulous vane
Dynamic balance
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?
Ball cage
Rolling ball
Torque ball
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?
Ball cage
Rolling ball
Torque ball
How is the pitch torque motor positioned in a torque motor?
Between inner and outer gimbal
Between outer gimbal and frame
Between inner gimbal and frame
How is the roll torque motor positioned in a torque motor?
Between inner and outer gimbal
Between outer gimbal and frame
Between inner gimbal and frame
When a gyroscope is in its normal vertical position, where does the mercury lie and which electrode is it in contact with?
Centre of tube and in contact with only centre electrode
Centre of tube and in contact with only left electrode
Centre of tube and in contact with only right electrode
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?
>10
<10
10
What does the erection rate increase to when the fast erection switch is on?
120 to 180 degrees per min
100 to 160 degrees per min
80 to 120 degrees per min
What duration should you not operate the fast erection switch longer than in case it overheats the stator coils?
15 seconds
20 seconds
25 seconds
When is it appropriate in flight to depress the fast erection switch to prevent false indications of pitch and bank attitude?
During straight and level flight
At a steady bank angle
Never switch on during flight, only on ground
When is a permanent magnet used in a DC coil as in case for the correction for apparent drift?
Constant correction force
Sporadic correction force
Temporary correction force
How long does the electromagnet operate for after power has been applied?
20 seconds
10 seconds
15 seconds
How do you correct for erection error in erection systems?
Apply torque to outer gimbal, precessing the inner
Apply torque to inner gimbal, precessing the outer
Apply torque to both inner and outer gimbal
In acceleration, an AH can make a false reading of?
Ascent
Decent
No effect
Inclination of gyro spin axis, erection cut out, pitch-bank compensation are all factors which can prevent?
Erection error
Caging
Erection cut out
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?
0.18g
0.19g
0.2g
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?
3-6 degrees per second
6-9 degrees per second
10-13 degrees per second
What is the rotor speed of a turn and slip indicator?
4,200 rpm
3,200 rpm
2,200 rpm
