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Compass > Mock > Flashcards

Mock Flashcards

1
Q

Where does a gyroscope experience maximum tilt?

A

The equator

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2
Q

What does the second law of magnetism state?

A

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

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3
Q

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

A

Good damping of the card movement

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4
Q

What is a pelorus?

A

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

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5
Q

What rods relate to coefficient D?

A

a and e rods

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6
Q

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

A

Sin curve

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7
Q

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

A

False

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8
Q

What influences the drift of a gyroscope?

A

Rotation of the Earth and Latitude of the ship

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9
Q

What are the foci of magnetic lines of force called?

A

The poles of the magnet

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10
Q

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

A

Athwartship

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11
Q

Is damping error integral to a gyro damped in azimuth?

A

No

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12
Q

What maintenance is carried out on a Fibre Optic Gyro?

A

Cleaning with a clean cloth

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13
Q

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

A

No

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14
Q

What is ballistic deflection caused by?

A

Precession that results from a surge in the liquid ballistics

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15
Q

Heeling error is the largest at which headings?

A

North and South

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16
Q

What does the first law of magnetism state?

A

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

17
Q

What does k rod represent?

A

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

18
Q

What is variation?

A

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

19
Q

Damping error can be approximated to what?

A

1.5TanLat

20
Q

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

A

15

21
Q
A
21
Q

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

A

Elliptical

22
Q

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

A

True

23
Q

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

A

True

24
Q

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

A

Restricting the movement of a spin axis

25
Q

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

A

True

26
Q

Coefficient D is corrected using what?

A

Quadrantal correctors

27
Q

Where would speed, course and latitude error be high?

A

Courses with North component

28
Q

Coefficient C is corrected using what?

A

Athwartships permanent magnets

29
Q

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

A

False

30
Q

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

A

Cos curve

31
Q

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.

A

False

32
Q

What are the components of gyroscopic inertia?

A

Tilt and drift

33
Q

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

A

True

34
Q

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

A

Rate-of-turn
Roll and pitch
Heading

35
Q

What relates to coefficient B?

A

Force P and c rod

36
Q

A free gyroscope has what (3)?

A

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

37
Q

What force relates to coefficient C?

A

Force Q

38
Q

What is induced magnetism collectively referred to as?

A

Rod-effects

Compass (2 decks)

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