Compasses

The angular difference between the True North and the Magnetic meridian is called _____ .

• deviation

• variation

• angle of dip

• magnetic north

It is a dimensionless proportionality constant that indicates the degree of magnetization of a material in response to an applied magnetic field.

• intensity of magnetization

• magnetic domain

• magnetic susceptibility

• permeability

Marine compasses are usually liquid-filled. The liquid has a ______ (reducing) effect on disturbances caused by the motion of the vessel in rough seas

• deviating

• fluctuating

• slowing

• damping

The __________ is pointed in the direction of the head of the vessel for steering on a given bearing.

• lubber line

• needle line

• head line

• compass line

______ are usually used to mount marine compasses. These keep the compass bowl horizontal, even in heavy rolling and pitching, at sea.

• Binnacles

• Quadrantal spheres

• Compass cards

• Gimbals

Which of the following is not an axis of a gyroscope?

• Diagonal axis

• Vertical axis

• Horizontal Axis

• Spin Axis

When spun rapidly, the gyroscope develops _________ tending to remain spinning in the same plane indefinitely.

• tilting

• gyroscopic inertia

• precession

• drifting

To make a gyrocompass seek and maintain true north, three things are necessary. Which among the following is not necessary?

• It must be made to remain horizontal

• It must be made to remain vertical

• It must stay in this position regardless of what the vessel does or where it goes on the earth

• Gyro must be made to stay on the plane of the meridian

Which of the following is an advantage of using a gyrocompass in marine navigation?

• Used in most ships in order to detect true north, steer, and find positions and record courses

• Not influenced by magnetism

• Any error is constant and equal around the horizon

• Can output a signal to repeaters spaced around the vessel

Defined as the angular difference between the compass direction and the corresponding true direction, may be easily computed since it is the algebraic sum of variation and deviation.

• Compass deviation

• Compass Anomaly

• Compass malfunction

• Compass Error