Chapter 5 - Compass Systems

Question 1

What is the period of a magnet?

Answer 1

The time taken for a magnet to swing from one extremity to another and back again

Question 2

What is magnetic moment?

Answer 2

Tendency for a magnet to turn or be turned by another magnet

Question 3

What is the primary reason for using liquid in the compass bowls?

Answer 3

Make the compass aperiodic

After being deflected, it will return to its equilibrium position directly without oscillating or overshooting

Question 4

In a direct reading compass, what compensates for the expansion and contraction of the fluid?

Answer 4

The liquid expansion bellows

Question 5

What is the mnemonic to remember how a direct reading compass will turn under acceleration effects?

Answer 5

Northern Hemisphere - ANDS (accelerate North decelerate South)

Southern Hemisphere - SAND

Question 6

What is the mnemonic to remember how a direct reading compass will indicate on a turn?

Answer 6

Northern Hemisphere - UNOS (undershoot North Overshoot South)

Southern Hemisphere - ONUS