Vayudoot Aviation

1. 15 sine latitude in degrees per hour increasing

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

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

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

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

2. The purpose of the caging knob is

to prevent apparent wander.

to prevent the gyro toppling.

to reset the heading and to prevent toppling.

to reset the heading.

3. A directional gyro indicator is basically a

vertical axis tied gyro.

horizontal axis earth gyro.

vertical axis earth gyro.

horizontal axis tied gyro.

4. Gimballing error

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.

will only occur during a 360 turn.

5. 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 north from 56 N the true heading of the aircraft will decrease

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

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

6. 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 for the time of running.

+15 sine latitude in degrees per hour.

-15 sine latitude in degrees per hour.

7. Apparent wander may be corrected in a DGI by

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.

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

8. 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; wedge plate.

the yawing plane; air jets; torque motor.

the horizontal plane; air jets; wedge plate.

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

85 and 55

55 and 55

55 and 85

85 and 85

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

the rotor axis.

the outer gimbal.

the inner gimbal.

the instrument casing.

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Questions for DIRECTIONAL GYRO INDICATOR (DGI)