Vayudoot Aviation

1. Rigidity of a gyroscope depends on:

mass, radius of gyration and speed of rotation.

rate of precession and the force applied.

weight, force applied and speed of rotation.

weight, rate of precession and speed of rotation.

2. Apparent wander of a gyro can be caused by

rotation of the earth.

clear air turbulence.

gimbal friction.

external torque.

3. A gyro with only one degree of freedom is known as a

earth gyro.

tied gyro.

space gyro.

rate gyro.

4. A perfectly balanced space gyro at the equator has its spin axis aligned with true north. After 6 hours the axis will be aligned with

true south direction.

true west direction.

true east direction.

true north direction.

5. In gyroscopic theory the term ‘drift' is defined as

real wander only, in the horizontal plane.

wander, real or apparent, in the vertical plane.

wander, real or apparent, in the horizontal plane

apparent wander only, in the horizontal plane.

6. Real wander of a gyro can be caused by

increasing the RPM of the rotor.

moving the gyro north or south of its present position

rotation of the earth.

asymmetrical friction at the spinning axis.

7. In gyroscopic theory the term ‘topple' is defined as

wander, real or apparent, in the vertical plane.

real wander only, in the horizontal plane.

wander, real or apparent, in the horizontal plane.

real wander only, in the vertical plane.

8. The main advantage of electric gyros are

light weight, high RPM, constant speed, inexpensive

high RPM, high moment of inertia, rapid build-up of speed, constant RPM.

high RPM, only require low voltage DC, constant speed, sealed casing.

sealed casing, constant speed, high precession rate, low cost.

9. A force applied to the spinning axis of a rotor is precessed

through 270° in the direction of spin of the rotor.

through 90° in the direction of spin of the rotor.

through 90° in the direction of spin of the rotor in the northern hemisphere through 90° in the opposite direction in the southern hemisphere.

at a rate proportional to the speed of rotation of the gyro.

10. A force is applied to deflect a gyroscope. If the RPM of the gyro is then doubled the precession rate will

remain as before.

decrease

increase

cease altogether.

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