29 Questions
What is the purpose of the slip rings and brushes or finger contact assemblies in an AC electric gyro?
To supply power to the gyro stator
What is the approximate speed of the rotor in an AC electric gyro?
20 000–23 000 rpm
What is the purpose of the torque motors in an AC electric gyro?
To maintain the erection of the gyro
What is indicated by a flag marked 'off' in an AC electric gyro?
The power supply has failed
What is an advantage of DC gyro systems over AC systems?
Rugged, light-weight instrument
What is the term for the process when the outer gimbal rotates 180 degrees due to the forces acting on the gimbal system?
Toppling
What is the main cause of unavoidable precession in a gyro?
Friction of gimbal bearings
What happens when deflective forces are too strong or applied rapidly to a gyro?
The gyro rotor topples over
What is the minimum consequence of a gyro rotor toppling over?
The bearings are damaged and the instrument is rendered useless
What type of gyro has complete freedom about three axes that are acting at right angles to each other?
Space gyro
What is the assumption for a space gyro to maintain its position relative to space for an indefinite time?
There are no gimbal or rotor bearing imperfections or external forces
What is the effect of a greater moment of inertia and greater angular velocity on the rate of precession?
The rate of precession decreases
What happens to the plane of rotation when a force is applied to a rotor?
It aligns with the plane of the applied force
What is the axis called where a torque is applied to a rotor?
Input axis
Why do we feel rigidity resisting us when we turn the handlebars of a spinning bicycle wheel?
Due to precession trying to twist the handlebars
What is the purpose of the course deviation bar in the Horizontal Situation Indicator?
To display the offset distance from the selected track
What is the purpose of mechanical stops in a gimbal system?
To prevent gimbal lock
What is represented by the small fixed symbol at the centre of the Horizontal Situation Indicator?
The aircraft itself
What happens when the spin axis of the rotor becomes aligned with the axis of the outer gimbal?
The gimbals become locked
What is the purpose of the heading bug in the Horizontal Situation Indicator?
To position the desired heading
What is the source of the aircraft heading information in the Horizontal Situation Indicator?
Different systems, including the inertial navigation system
What is displayed on the azimuth card in the Horizontal Situation Indicator?
The magnetic heading of the aircraft
What is a feature of the Electronic Horizontal Situation Indicator (EHSI)?
A moving map display with superimposed weather radar information
What happens when an aircraft is turning too fast for its bank angle?
The ball moves to the outside of the index marks.
What is the purpose of a turn coordinator in an aircraft?
To indicate the rate of turn and alignment of the wings.
What happens to the ball when the angle of bank is too high?
It drops below the index marks.
What is the characteristic of a skidding turn?
The aircraft is turning too fast for its bank angle.
What does the ball in the turn coordinator indicate when the aircraft is being flown in a coordinated manner?
The ball is centred.
What is the main difference between a turn coordinator and a turn-and-bank indicator?
The turn coordinator responds more quickly to changes in the aircraft's bank.
Understand how AC electric gyros work, including the role of three-phase supply, rotating magnetic fields, and squirrel-cage rotors. Learn about the interactions between the stator and rotor fields that enable the gyro to function.
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