Mock

Question 1

Where does a gyroscope experience maximum tilt?

Answer 1

The equator

Question 2

What does the second law of magnetism state?

Answer 2

The force between two poles varies directly as the product of their pole strengths and inversely as the distance between them

Question 3

What is the viscosity of the liquid in the compass bowl selected to provide?

Answer 3

Good damping of the card movement

Question 4

What is a pelorus?

Answer 4

A sighting device mounted on a 360 degree graduated plate with 0 degree graduation aligned with the ship’s fore and aft line

Question 5

What rods relate to coefficient D?

Answer 5

a and e rods

Question 6

Force P causes the compass deviation to vary in accordance with which curve?

Answer 6

Sin curve

Question 7

Force P is the athwartship component of a ship’s induced magnetic field. True or false?

Answer 7

False

Question 8

What influences the drift of a gyroscope?

Answer 8

Rotation of the Earth and Latitude of the ship

Question 9

What are the foci of magnetic lines of force called?

Answer 9

The poles of the magnet

Question 10

Force Q is which component of a ship’s permanent magnetic field?

Answer 10

Athwartship

Question 11

Is damping error integral to a gyro damped in azimuth?

Answer 11

No

Question 12

What maintenance is carried out on a Fibre Optic Gyro?

Answer 12

Cleaning with a clean cloth

Question 13

Should any accidental movement of the correctors in the binnacle be left until the next compass correction?

Answer 13

No

Question 14

What is ballistic deflection caused by?

Answer 14

Precession that results from a surge in the liquid ballistics

Question 15

Heeling error is the largest at which headings?

Answer 15

North and South

Question 16

What does the first law of magnetism state?

Answer 16

That like poles repel each other and unlike poles attract each other

Question 17

What does k rod represent?

Answer 17

Vertical soft iron that has its effective pole directly below the compass

Question 18

What is variation?

Answer 18

The name given to an angle between the Magnetic and True Meridian of the Earth

Question 19

Damping error can be approximated to what?

Answer 19

1.5TanLat

Question 20

A gyro axis tilts upwards at the rate of approximately how many degrees per hour?

Answer 20

15

Question 21

What path does the axis of a gravity controlled gyro follow?

Answer 21

Elliptical

Question 22

The composition of hard iron is such that once magnetised it will retain that magnetism. True or false?

Answer 22

True

Question 23

A gyroscope spin axis would experience tilt and drift at Latitudes other than the equator. True or false?

Answer 23

True

Question 24

What does the damping of a gyroscope spin axis refer to?

Answer 24

Restricting the movement of a spin axis

Question 25

On modern gyrocompasses the Speed, Course & Latitude error is calculated using manual or GPS inputs. True or false?

Answer 25

True

Question 26

Coefficient D is corrected using what?

Answer 26

Quadrantal correctors

Question 27

Where would speed, course and latitude error be high?

Answer 27

Courses with North component

Question 28

Coefficient C is corrected using what?

Answer 28

Athwartships permanent magnets

Question 29

A fibre-optic gyrocompass relies entirely on the stability of the speed of light in a vacuum. True or false?

Answer 29

False

Question 30

Force Q causes the compass deviation to vary in accordance with which curve?

Answer 30

Cos curve

Question 31

The c rod represents horizontal soft iron that has its effective pole in the same fore and aft line as the compass. True or false.

Answer 31

False

Question 32

What are the components of gyroscopic inertia?

Answer 32

Tilt and drift

Question 33

A gravity-controlled gyroscope may have a pair of Mercury pots attached with a fine bore tube. True or false.

Answer 33

True

Question 34

The output from a fibre-optic gyrocompass can include what?

Answer 34

Rate-of-turn Roll and pitch Heading

Question 35

What relates to coefficient B?

Answer 35

Force P and c rod

Question 36

A free gyroscope has what (3)?

Answer 36

Spin axis, three degrees of freedom of movement, a well-balanced rotor

Question 37

What force relates to coefficient C?

Answer 37

Force Q

Question 38

What is induced magnetism collectively referred to as?

Answer 38

Rod-effects