GATE Naval Architecture and Marine Engineering Practice Quiz

Question 1

For a ship in regular head waves, the heave Response Amplitude Operator (RAO) is defined as the ratio of heave amplitude to wave amplitude. If the incident wave amplitude is doubled while the encounter frequency remains unchanged and the motion stays within the linear range, the heave RAO will

Accepted Answer

remain unchanged because RAO is a linear transfer ratio at fixed frequency

Question 2

A roll RAO plotted against encounter frequency shows a sharp peak near one particular frequency. This peak most directly indicates

Accepted Answer

the ship's roll natural frequency is close to that encounter frequency

Question 3

A heave RAO tends to become very small at very high encounter frequencies mainly because

Accepted Answer

inertia and added-mass effects prevent the hull from following the rapidly varying wave profile

Question 4

For a linear single-degree approximation of roll, the displacement RAO magnitude near resonance is reduced most effectively by increasing

Accepted Answer

roll damping coefficient

Question 5

In linear frequency-domain seakeeping, the phase of a pitch RAO relative to the incident wave elevation primarily represents

Accepted Answer

the time lead or lag of pitch response relative to wave excitation at that frequency

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