NAV1 MID QUIZ 3 (1242)

The time interval between the transmission and reception of a pulse in an echo sounder is used to determine:

• Ship’s location

• Water depth

• Water salinity

• Atmospheric pressure

Which of the following is NOT a component of an echo sounder?

• Transducer

• Amplifier

• Pulse generator

• Converter

The term "Under Keel Clearance" (UKC) refers to:

• The space between the seabed and the keel of a ship

• The total height of a ship

• The ship's total depth

• The distance from waterline to the top of the mast

The process of compensating for the ship’s draft when reading the depth on an echo sounder is known as:

• Gain adjustment

• Depth correction

• Zero adjustment

• Phasing

How is the velocity of sound in water affected?

• It changes with the water depth

• It remains constant

• It changes with temperature, salinity, and pressure

• It only changes with temperature

The error caused by ferrous materials in a ship is called:

• Magnetic variation

• Compass deviation

• Magnetic heading

• True bearing

What is the primary cause of magnetic deviation on ships?

• Earth's magnetic poles

• Compass calibration

• The ship’s own magnetism

• Incorrect heading

What is the relationship between Earth's magnetic field and a ship’s magnetic compass?

• The compass aligns with Earth's magnetic field

• The compass aligns with Earth's geographic poles

• The compass is unaffected by the Earth's magnetic field

• The compass only aligns with the ship’s heading

A lubber line on a compass indicates:

• Magnetic north

• The ship’s heading

• Wind direction

• The compass variation

The purpose of the liquid in a liquid compass is to:

• Cool down the needle

• Dampen oscillations

• Increase magnetism

• Stabilize the gyrocompass