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CPL Test Series
Question Bank
Questions for DIRECTIONAL GYRO INDICATOR (DGI)
Answer the following questions
Test Mode
Training Mode
1. Apparent wander may be corrected in a DGI by
attaching a bias weight to the inner gimbal which makes the gyro precess in azimuth in the opposite direction to apparent wander.
correcting wander by means of air jets.
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.
2. An air driven DGI is corrected for apparent wander at 56 N. If the aircraft is maintaining constant DGI readings
when flying south from 56 N the true heading will decrease.
when flying east from 56 N the true heading will decrease.
when flying west from 56 N the true heading will increase.
when flying north from 56 N the true heading of the aircraft will decrease
3. In an air driven directional gyro the air jets are attached to
the inner gimbal.
the instrument casing.
the rotor axis.
the outer gimbal.
4. The purpose of the caging knob is
to prevent the gyro toppling.
to prevent apparent wander.
to reset the heading and to prevent toppling.
to reset the heading.
5. 15 sine latitude in degrees per hour increasing
acceleration error, turning error, altitude error, transport wander, rotor speed error.
gimballing error, looping error, rolling error, rotor speed error, transport wander.
transport wander, apparent wander, latitude error, turning error, acceleration error.
gimballing error, random wander, apparent wander, rotor speed error, transport wander.
6. A directional gyro indicator is basically a
vertical axis earth gyro.
horizontal axis tied gyro.
vertical axis tied gyro.
horizontal axis earth gyro.
7. 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 vertical plane; air jets; torque motor.
the yawing plane; air jets; torque motor.
the horizontal plane; air jets; wedge plate.
the yawing plane; air jets; wedge plate.
8. The formula used to calculate apparent wander of a directional gyro in the northern hemisphere is
+15 sine latitude in degrees per hour.
15 sine latitude in degrees per hour increasing
+15 sine latitude in degrees for the time of running.
-15 sine latitude in degrees per hour.
9. Gimballing error
will be zero on only two headings during a 360 turn.
will disappear after a turn is completed.
will remain until the gyro is reset.
will only occur during a 360 turn.
10. The limits of pitch and roll for a modern directional gyro are respectively
55 and 85
85 and 85
85 and 55
55 and 55
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