AC Electric Gyros and Rotating Magnetic Fields

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Questions and Answers

What is the typical voltage and frequency used in an AC electric gyro?

115-V, 400-Hz

What is the purpose of the current induced in the rotor bars in an AC electric gyro?

To interact with the stator's rotating field and cause the rotor to turn

How is the failure of the power supply indicated in an AC electric gyro?

By a flag marked 'off' and actuated by a solenoid

What is an advantage of DC gyro systems?

Rugged, light-weight instrument Signup and view all the answers

What is the typical speed range of the rotor in an AC electric gyro?

20 000–23 000 rpm Signup and view all the answers

What is the purpose of regularly caging and resetting the directional gyroscope during flight?

To ensure correct alignment with the compass heading Signup and view all the answers

Approximately how many rpm does an air-driven directional gyroscope spin?

12 000 to 15 000 Signup and view all the answers

What is the function of the torque generated by the rotor exhaust air in the directional gyroscope?

To maintain the inner gimbal erect Signup and view all the answers

What is indicated by the compass card in the directional gyroscope?

Aircraft heading Signup and view all the answers

What is the name of the indicator that provides a more intuitive presentation of the aircraft heading?

Horizontal situation indicator Signup and view all the answers

What is the purpose of the lubber line in the directional gyroscope?

To indicate the direction of the aircraft nose Signup and view all the answers

What is the purpose of the erection system in an artificial horizon?

To re-align the gyro with respect to gravity Signup and view all the answers

What is the main function of an artificial horizon in an aircraft?

To indicate the aircraft's pitch and roll attitude Signup and view all the answers

Why is the gyro spin axis maintained in a vertical position or horizontal plane of rotation?

To provide a reference point for the aircraft's movement Signup and view all the answers

What is the purpose of electrical or dynamic braking in electrically driven gyros?

To slow the gyro rotor very quickly once power is removed Signup and view all the answers

What is the reference point used to measure the movement of an aircraft in an artificial horizon?

The gyro rotor Signup and view all the answers

What is the purpose of the gimbals in an artificial horizon?

To measure the movement of the aircraft around the gyro Signup and view all the answers

What is the primary function of the rate gyro in a turn-and-slip indicator?

To detect the rate of turn Signup and view all the answers

What type of aircraft is the turn component of the indicator still commonly used in?

Light aircraft Signup and view all the answers

What is the primary component of the slip indicator in a turn-and-slip indicator?

A ball in a curved liquid-filled tube Signup and view all the answers

What is the purpose of the pointer in a rate gyro?

To align with a zero rate turn mark on the dial Signup and view all the answers

What is the purpose of the caging button on a vacuum direction gyro?

To lock the two gimbals together and align the needle with the compass heading Signup and view all the answers

What is the axis of spin of the gyro rotor in a rate gyro?

Lateral axis of the aircraft Signup and view all the answers

How does the readout on a heading indicator differ from that of a direction gyro?

The heading indicator shows the correct direction of turn Signup and view all the answers

What is the typical location of the slip indicator in modern aircraft?

Incorporated into the attitude director indicator Signup and view all the answers

On a direction gyro, what is the direction of 330° relative to north?

To the right of north Signup and view all the answers

What is the benefit of the heading indicator compared to the direction gyro?

It removes the confusion from the display Signup and view all the answers

What is the result of caging the direction gyro?

The two gimbals are locked together Signup and view all the answers

What is the horizontal spin axis directional gyro remotely mounted from?

The Horizontal Situation Indicator (HSI) Signup and view all the answers

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