List of top Naval Architecture and Ocean Engineering Questions on Marine Engineering asked in GATE NM

A propeller rotating at a speed of 108 RPM behind the ship produces a thrust of 720 kN with a torque of 700 kNm, when it travels at a speed of 15 knots. In open water, this propeller rotating at the same speed, produces the same thrust at an advance speed of 12 knots, and develops the same torque at an advance speed of 12.3 knots. Then, the average of the wake fractions is ____________ (correct to two decimal places).
A ship moves at \(U = 9.81\ \text{m/s}\) in deep water. A wave is incident at an angle \(\beta = 120^\circ\). The encounter period measured onboard is \(4.187\ \text{s}\). Using \(g = 9.81\ \text{m/s}^2\), determine the actual wave period ____________ s (rounded off to one decimal place).
An autonomous underwater vehicle is made of a long cylinder with a semi-ellipsoid at the forward end and a hemisphere at the aft end as shown in the figure. The origin of the reference frame is located at the centroid of the cylinder.
The positive x, y and z axes, respectively, are pointing towards forward, port and upward directions. The surge, sway and heave motions are represented by indices 1-2-3 and roll, pitch and yaw motions are represented by indices 4-5-6, respectively.
If A = [A\(_{ij}\)] is the added mass matrix, then which of the following are NOT zero?
If a ship hull is subdivided into different watertight compartments, which of the following statements are TRUE?