AEIS CHAPTER 5

Question 1

What is a gyroscope

Answer 1

A gyroscope is a rotating mass having freedom in one or more planes perpendicular to the plane of rotation

Question 2

Gyroscope possesses two important characteristics

Answer 2

1. Gyroscope inertia or rigidity
2. Precession

Question 3

Gyroscopic inertia or rigidity is defined as

Answer 3

the property which resists any force tending to change the plane of rotation of its rotor

Question 4

Gyroscopic inertia or rigidity is dependant on i) and ii) of the rotor, iii) of rotation and iv)

Answer 4

i) mass
ii) radius
iii) speed
iv) radius of gyration

Question 5

define precession

Answer 5

defined as the angular change in direction of the plane when a force is applied

Question 6

rate of precession depends on 3 factors which are :

Answer 6

i) strength and direction of applied force
ii) moment of inertia of the rotor
iii) angular velocity of the rotor

Question 7

increase in strength and direction of the applied force results in an i) in the rate of precession

Answer 7

increase

Question 8

increase in moment of inertia of the rotor results in a i) in the rate of precession

Answer 8

decrease

Question 9

increase in angular velocity of the rotor results in a i) in the rate of precession

Answer 9

decrease

Question 10

i) are the most common type of gyroscope

Answer 10

i) mechanical gyroscope

Question 11

mechanical gyroscopes relies on a i) to spin

Answer 11

i) ball bearing

Question 12

mechanical gyroscopes are mainly used in the navigation of i) and in ii)

Answer 12

i) large aircraft
ii) missile guidance and control

Question 13

mechanical gyroscopes are usually i) than other forms of gyroscope

Answer 13

i) noisier

Question 14

i) was used by NASA in the development of the hubble telescope which they claim to be among the accurate in the world

Answer 14

i) Gas-bearing gyroscope

Question 15

In a gas-bearing gyroscope, the rotor is i), ii) between the moving parts

Answer 15

i) suspended by pressurized gas
ii) reducing the amount of friction

Question 16

gas-bearing gyroscopes are much i) than other forms of gyroscopes and also have greater ii)

Answer 16

i) quieter
ii) accuracy

Question 17

optical gyroscopes do not rely on a i)

Answer 17

i) rotating wheel or bearing

Question 18

optical gyroscopes are not based on the i)

Answer 18

i) conversation of angular momentum

Question 19

there are i) in a optical gyroscope

Answer 19

i) no moving parts

Question 20

fiber optic gyroscopes are very i) and used in modern ii) and iii)

Answer 20

i) durable
ii) rocketry
iii) spacecraft

Question 21

real precession is a i) caused by an ii)

Answer 21

i) deflection of the spin axis
ii) externally applied force

Question 22

the externally applied force that causes real precession is the result of i) or ii) caused by iii) the aircraft or iv)

Answer 22

i) G-forces
ii) acceleration/deceleration
iii) turning
iv) changing airspeeds

Question 23

to generate real precession, the force must attempt either to i) or ii) the iii)

Answer 23

i) turn
ii) tilt
iii) spin axis

Question 24

apparent gyroscopic precession is the i) in relation to the ii)

Answer 24

i) movement of the earth
ii) gyro

Question 25

the greatest amount of apparent precession is at the i)

Answer 25

i) equator

Question 26

the amount of apparent precession i) as the gyro moves toward the North or South Pole

Answer 26

i) decreases

Question 27

apparent precision is i) at the north or south poles

Answer 27

i) zero

Question 28

Gyro drift refers to i) precessions

Answer 28

i) random

Question 29

gyro drift ( random precessions ) is a i) of the spin axis caused by an ii) resulting from iii)

Answer 29

i) deflection of the spin axis ii) internally applied force iii) imperfect construction

Question 30

two major causes of gyro drift (random precessions) are i) and ii)

Answer 30

i) unbalanced rotors ii) bearing friction