GATE Naval Architecture and Marine Engineering Practice Quiz

Question 1

For a ship floating at an even keel in seawater, the displacement is $12000\,\text{t}$ and the longitudinal center of flotation is $2\,\text{m}$ forward of amidships. A weight of $60\,\text{t}$ is shifted longitudinally by $20\,\text{m}$ aft. If the moment to change trim by $1\,\text{cm}$ is $240\,\text{t-m/cm}$, the change of trim is closest to

Accepted Answer

$5.0\,\text{cm}$ by stern

Question 2

A rectangular barge has length $60\,\text{m}$, breadth $12\,\text{m}$, draft $3\,\text{m}$, and floats in freshwater. Its transverse metacentric radius $BM_T$, neglecting shell thickness, is approximately

Accepted Answer

$4.0\,\text{m}$

Question 3

In potential-flow wave theory, for deep-water regular waves of wavelength $\lambda$, the phase velocity $c$ is given by

Accepted Answer

$c=\sqrt{\frac{g\lambda}{2\pi}}$

Question 4

A ship model is tested at Froude similarity. The model scale ratio is $\lambda=\frac{L_s}{L_m}=25$. If the model speed is $1.8\,\text{m/s}$, the corresponding ship speed is

Accepted Answer

$9.0\,\text{m/s}$

Question 5

For a propeller operating in open water, the thrust coefficient is $K_T=0.20$, torque coefficient is $K_Q=0.035$, and advance coefficient is $J=0.75$. The open-water efficiency $\eta_0$ is closest to

Accepted Answer

$0.68$

GATE Naval Architecture and Marine Engineering

Practice Quizzes

GATE Naval Architecture and Marine Engineering Practice Quiz

Hydrostatic Pressure on Surfaces Fundamentals | GATE Naval Architecture and Marine Engineering