Which of the following boiler(s) is/are NOT used in a nuclear propulsion system for ships?
Show Hint
- Water tube boiler
- Cochran boiler
- Double evaporation boiler
- Boiled water reactor boiler
The Correct Option is A
Solution and Explanation
Step 1: Understand the role of boilers in nuclear propulsion systems.
Nuclear propulsion systems rely on reactors to generate heat through nuclear fission, which is then used to produce steam for turbines. Boilers used in such systems must efficiently handle high pressures, temperatures, and specific requirements for nuclear safety.
Step 2: Analyze the options.
Water tube boiler (Option A):Although widely used in conventional steam generation, it is not suitable for nuclear propulsion systems because it does not meet the specific safety and operational requirements of nuclear reactors.
Cochran boiler (Option B): This is a fire-tube boiler used for small-scale applications. It cannot handle the high-pressure and high-temperature requirements of nuclear propulsion systems.
Double evaporation boiler (Option C): This boiler is used in specialized non-nuclear applications to improve thermal efficiency. However, it is not part of the standard nuclear propulsion system for ships.
Boiled water reactor boiler (Option D): This is integral to nuclear propulsion systems as it uses nuclear fission to generate steam directly, making it essential in such applications.
Step 3: Determine the correct answer.
Boilers not used in nuclear propulsion systems are: Water tube boiler (A), Cochran boiler (B), Double evaporation boiler (C). Conclusion: The boilers NOT used in nuclear propulsion systems for ships are Water tube boiler, Cochran boiler, and Double evaporation boiler.
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