DIRECTIONAL GYRO INDICATOR (DGI) – Air – DGCA Question Bank For Politics

#1. A directional gyro indicator is basically a:

horizontal axis earth gyro.

horizontal axis tied gyro.

vertical axis earth gyro.

vertical axis tied gyro.

#2. Apparent wander may be corrected in a DGI by:

causing the gyro to precess in a clockwise direction (in the northern hemisphere).

attaching a bias weight to the inner gimbal which makes the gyro precess in azimuth in the same direction as apparent wander.

correcting wander by means of air jets.

attaching a bias weight to the inner gimbal which makes the gyro precess in azimuth in the opposite direction to apparent wander.

#3. An air driven DGI is corrected for apparent wander at 56 N. If the aircraft is maintaining constant DGI readings:

when flying north from 56 N the true heading of the aircraft will decrease

when flying east from 56 N the true heading will decrease.

when flying south from 56 N the true heading will decrease.

when flying west from 56 N the true heading will increase.

#4. The formula used to calculate apparent wander of a directional gyro in the northern hemisphere is:

+15 sine latitude in degrees for the time of running.

+15 sine latitude in degrees per hour.

-15 sine latitude in degrees per hour.

15 sine latitude in degrees per hour increasing

#5. Errors of the directional gyro are:

acceleration error, turning error, altitude error, transport wander, rotor speed error.

gimballing error, random wander, apparent wander, rotor speed error, transport wander.

gimballing error, looping error, rolling error, rotor speed error, transport wander.

transport wander, apparent wander, latitude error, turning error, acceleration error.

#6. The spin axis of a directional gyro is maintained in ....... by means of ...... in an air driven gyro and by means of a ....... in an electrically driven gyro:

the horizontal plane; air jets; wedge plate.

the vertical plane; air jets; torque motor.

the yawing plane; air jets; torque motor.

the yawing plane; air jets; wedge plate.

#7. The purpose of the caging knob is:

to prevent the gyro toppling.

to reset the heading.

to reset the heading and to prevent toppling.

to prevent apparent wander.

#8. In an air driven directional gyro the air jets are attached to:

the inner gimbal.

the outer gimbal.

the instrument casing.

the rotor axis.

#9. The limits of pitch and roll for a modern directional gyro are respectively:

55 and 85

85 and 55

55 and 55

85 and 85

#10. Gimballing error:

will disappear after a turn is completed.

will remain until the gyro is reset.

will only occur during a 360 turn.

will be zero on only two headings during a 360 turn.

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