Vayudoot Aviation

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

85 and 85

85 and 55

55 and 85

55 and 55

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

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.

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

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

15 sine latitude in degrees per hour increasing

-15 sine latitude in degrees per hour.

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

+15 sine latitude in degrees per hour.

4. 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 horizontal plane; air jets; wedge plate.

the yawing plane; air jets; torque motor.

the yawing plane; air jets; wedge plate.

5. 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.

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

correcting wander by means of air jets.

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

6. 15 sine latitude in degrees per hour increasing

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

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.

7. A directional gyro indicator is basically a

vertical axis earth gyro.

horizontal axis earth gyro.

vertical axis tied gyro.

horizontal axis tied gyro.

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

the inner gimbal.

the rotor axis.

the outer gimbal.

the instrument casing.

9. Gimballing error

will only occur during a 360 turn.

will remain until the gyro is reset.

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

will disappear after a turn is completed.

10. The purpose of the caging knob is

to prevent apparent wander.

to reset the heading.

to prevent the gyro toppling.

to reset the heading and to prevent toppling.

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Questions for DIRECTIONAL GYRO INDICATOR (DGI)