DIRECTIONAL GYRO INDICATOR (DGI)

Question 1

1. A directional gyro indicator is basically a:

Answer 1

b. horizontal axis tied gyro.

Question 2

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

Answer 2

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

Question 3

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

Answer 3

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

Question 4

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

Answer 4

c. -15 sine latitude in degrees per hour.

Question 5

5. Errors of the directional gyro are:

Answer 5

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

Question 6

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:

Answer 6

c. the yawing plane; air jets; torque motor.

Question 7

7. The purpose of the caging knob is:

Answer 7

c. to reset the heading and to prevent toppling.

Question 8

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

Answer 8

b. the outer gimbal.

Question 9

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

Answer 9

d. 85 and 85

Question 10

10. Gimballing error:

Answer 10

a. will disappear after a turn is completed.