Vayudoot Aviation

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

space gyro.

rate gyro.

tied gyro.

earth gyro.

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

wander, real or apparent, in the horizontal plane

apparent wander only, in the horizontal plane.

real wander only, in the horizontal plane.

wander, real or apparent, in the vertical plane.

3. 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 north direction.

true east direction.

true west direction.

true south direction.

4. Rigidity of a gyroscope depends on:

mass, radius of gyration and speed of rotation.

weight, rate of precession and speed of rotation.

weight, force applied and speed of rotation.

rate of precession and the force applied.

5. Apparent wander of a gyro can be caused by

external torque.

rotation of the earth.

clear air turbulence.

gimbal friction.

6. Real wander of a gyro can be caused by

increasing the RPM of the rotor.

rotation of the earth.

moving the gyro north or south of its present position

asymmetrical friction at the spinning axis.

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

increase

remain as before.

decrease

cease altogether.

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

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

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

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

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

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

real wander only, in the horizontal plane.

real wander only, in the vertical plane.

wander, real or apparent, in the horizontal plane.

wander, real or apparent, in the vertical plane.

Question Bank

Questions for GYROSCOPES