Which of the following hull distortion(s) is/are resisted by a ship’s transverse bulkhead?
Show Hint
- Racking
- Torsion
- Longitudinal bending
- Horizontal bending
The Correct Option is A
Solution and Explanation
Step 1: Understand the function of transverse bulkheads.
Transverse bulkheads are structural elements placed perpendicular to the ship's longitudinal axis. They resist forces acting laterally on the hull and provide rigidity to minimize deformation caused by external forces.
Step 2: Analyze racking.
Racking refers to the deformation of the ship's hull due to lateral forces (e.g., waves or cargo shifts) that create a parallelogram-like distortion. Transverse bulkheads resist racking by maintaining lateral rigidity and preventing excessive deformation.
Step 3: Analyze torsion.
Torsion occurs due to twisting forces along the longitudinal axis of the ship, often caused by asymmetrical wave loading. While longitudinal structures play a significant role, transverse bulkheads assist in resisting torsion by contributing to the overall structural integrity of the ship.
Step 4: Analyze other distortions.
Longitudinal bending (Option C): This is caused by uneven loading or wave-induced forces and is resisted primarily by the keel and longitudinal girders, not transverse bulkheads. Horizontal bending (Option D): This results from uneven lateral forces and is resisted by side structures, not transverse bulkheads.
Conclusion: The hull distortions resisted by a ship's transverse bulkhead are racking and torsion.
Top Questions on Naval Engineering
A steel deck plate of a tanker is supported by two longitudinal stiffeners as shown in the figure. The width of the plate is \( a \) and its length is 5 times the width. Assume that the long edge is simply supported, and the short edge is free. The plate is loaded by a distributed pressure, \( p = p_0 \sin\left(\frac{\pi y}{a}\right) \), where \( p_0 \) is the pressure at \( y = a/2 \). The flexural rigidity of the plate is \( D \). The plate equation is given by
- GATE NM - 2024
- Naval Architecture and Ocean Engineering
- Naval Engineering
Consider the matrices
\( M = \begin{pmatrix} 2 & 1 \\ 0 & 2 \end{pmatrix} \)
\( N = \begin{pmatrix} 1 & 0 & 0 \\ 1 & 2 & 0 \\ 1 & 1 & 0 \end{pmatrix} \)
Which one of the following is true?- GATE NM - 2024
- Naval Architecture and Ocean Engineering
- Naval Engineering
A ship with a standard right-handed coordinate system has positive \(x\), \(y\), and \(z\) axes respectively pointing towards bow, starboard, and down as shown in the figure. If the ship takes a starboard turn, then the drift angle, sway velocity, and the heel angle of the ship for a steady yaw rate respectively are:
- GATE NM - 2024
- Naval Architecture and Ocean Engineering
- Naval Engineering
- A ship with controls fixed is modeled as a two degrees of freedom system. For the linear maneuvering equations of motion for coupled sway and yaw, if the derived eigenvalues are real and negative, then the ship must possess:
- GATE NM - 2024
- Naval Architecture and Ocean Engineering
- Naval Engineering
- Which one of the following cooling systems is used in large marine diesel engines?
- GATE NM - 2024
- Naval Architecture and Ocean Engineering
- Naval Engineering
Questions Asked in GATE NM exam
- Consider the function \( f(x) = |x| - 1 \). Which of the following statements is/are true in the interval \([-10, 10]\)?
- GATE NM - 2025
- Continuity and differentiability
A closed system is undergoing a reversible process 1–P–2 from state 1 to 2, as shown in the figure, where X and Y are thermodynamic properties. An irreversible process 2–Q–1 brings the system back from 2 to 1. The net change in entropy of the system and surroundings during the above-mentioned cycle are _______ respectively.
- GATE NM - 2025
- Thermodynamics
A ship of 3300 tonne displacement is undergoing an inclining experiment in seawater of density 1025 kg/m\(^3\). A mass of 6 tonne is displaced transversely by 12 m as shown in the figure. This results in a 0.12 m deflection of a 11 m long pendulum suspended from the centerline. The transverse metacenter of the ship is located at 7.25 m above the keel.
The distance of the center of gravity from the keel is ________ m (rounded off to two decimal places).
- GATE NM - 2025
- Ship Dynamics
A multi-cell midship section of a ship with \( B = 40 \, {m} \) and \( D = 20 \, {m} \) is shown in the figure. The shear-flows are given as \( q_1 = q_2 = q_3 = 0.9376 \, {MN/m} \). The applied twisting moment on the midship section is ___________ MN·m (rounded off to two decimal places).
- GATE NM - 2025
- Ship Dynamics
Consider a weightless, frictionless piston with a 2 kg mass placed on it as shown in the figure. At equilibrium in position 1, the cylinder contains 0.1 kg of air. The piston cross-sectional area is 0.01 m2. The ambient pressure in the surroundings outside the piston-cylinder arrangement is 0 bar (absolute). When the mass above the piston is removed instantaneously, it moves up and hits the stop at position 2, which is 0.1 m above the initial position.
Assuming \( g = 9.81 \, {m/s}^2 \), the thermodynamic work done by the system during this process is ________ J (answer in integer).
- GATE NM - 2025
- Thermodynamics