GYROSCOPES – Air – DGCA Question Bank For Politics

#1. Rigidity of a gyroscope depends on:

weight, force applied and speed of rotation.

rate of precession and the force applied.

weight, rate of precession and speed of rotation.

mass, radius of gyration and speed of rotation.

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

remain as before.

increase

decrease

cease altogether.

#3. 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 vertical plane.

wander, real or apparent, in the horizontal plane.

#4. A force applied to the spinning axis of a rotor is precessed:

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.

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

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

#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.

apparent wander only, in the horizontal plane.

wander, real or apparent, in the horizontal plane

#6. Real wander of a gyro can be caused by:

asymmetrical friction at the spinning axis.

rotation of the earth.

increasing the RPM of the rotor.

moving the gyro north or south of its present position

#7. A gyro with only one degree of freedom is known as a:

tied gyro.

earth gyro.

space gyro.

rate gyro.

#8. 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 east direction.

true west direction.

true north direction.

true south direction.

#9. The main advantage of electric gyros are:

light weight, high RPM, constant speed, inexpensive

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

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

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

#10. Apparent wander of a gyro can be caused by:

rotation of the earth.

clear air turbulence.

gimbal friction.

external torque.

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