Vayudoot Aviation

1. 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.

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

rate gyro.

earth gyro.

tied gyro.

space gyro.

3. Real wander of a gyro can be caused by

rotation of the earth.

increasing the RPM of the rotor.

moving the gyro north or south of its present position

asymmetrical friction at the spinning axis.

4. Rigidity of a gyroscope depends on:

weight, force applied and speed of rotation.

rate of precession and the force applied.

mass, radius of gyration and speed of rotation.

weight, rate of precession and speed of rotation.

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

cease altogether.

increase

decrease

remain as before.

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

real wander only, in the horizontal plane.

wander, real or apparent, in the horizontal plane

apparent wander only, in the horizontal plane.

wander, real or apparent, in the vertical plane.

7. The main advantage of electric gyros are

light weight, high RPM, constant speed, inexpensive

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

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

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

8. Apparent wander of a gyro can be caused by

gimbal friction.

external torque.

rotation of the earth.

clear air turbulence.

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

wander, real or apparent, in the horizontal plane.

real wander only, in the vertical plane.

real wander only, in the horizontal plane.

wander, real or apparent, in the vertical plane.

10. 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 west direction.

true east direction.

true south direction.

true north direction.

Question Bank

Questions for GYROSCOPES