D:-All of the above
Correct Answer:- Option-D

Question78:-The instrument used for measuring heading angle and which does not depend on Earth's magnetic field is
called

-Gyrocompass
:-Magnetic compass
C:-Tachometer
D:-Speedometer
Correct Answer:- Option-A

Question79:-The yaw motion equation for 6 DoF motion is expressed as follows. The terms *I_{zx}, I_{zy}, |_{xy}" are part
0

1 {2z} dotr +1_{zx} (dotp-rq) + 1_{zy} (dotq + mp} +H_{xy} 2-2)” 4
{I_{yy} - I_{text {3x}}} pg+ mx_G (dotv+ur-wp}

A:-Inertia tensor
B:-Inertia matrix
C:-Mass matrix
0:-{1} २१५ (2)
Correct Answer:- Option-D
Question80:-The 3 DoF motion equation of surface ship is given below :

“m [dotu-vr-x_{G} r*2] = -A_{11} dotu +X_{text{uu}} u”2 +a_3 v*2 +a_7 "2 +a_9 vr+X_P+X R’

“m [dotv +ur-x_G dotr] =

*-A_{22) dotv - ^ {26} वजा - A_{11}ur+b_1lv+b_3r+b_{13}v~2r+b_{15} vr*2 + b_{26} v~3 +b_{28}r*3 +Y P+Y R’
`| {व्यो वणौ =`

"^ {62} 4०५ - ^ {66} वन - (^ {22} -4 {11}) ५४ -५ (26) + 1४ + 137 + 1 {13} ४^2 1 {15} भ^2 + { {26} ४^३
+ {28} 3 + ॥ 6 + ५

[158 differential equation.
A:-Coupled and linear
B:-Partial

C:-Coupled and non [ध्वा
D:-None of the above
Correct Answer:- Option-C

Question81:-The sway + yaw coupled oscillation motion equation and PD autopilot equation at steady forward speed fora
ship is given below. When expressed in the state space form *Adotx=Bx+Cz" , the size of A matrix will be:

[[(m"-Y"_{dotv}}, YL[-(N'_{dotv}-m'x’_{CG}}, உச்‌ ண்ண உபி ளக
{(Y'_{delta} delta_R),(N'_{delta} delta_R})

“T'_E dotdelta’ = K'_P (psi_d - psi} - T_D(r'} - delta_R*
‏۰4ھ‎
‎B:-No
‎C:-Sway
‎0:-{1} २१५ (2)
Correct Answer:- Option-A
Question82:-Explain why a conventional merchant ship heels when the rudder angle is given. Does the direction of heel
angle change as the ship's sway + yaw dynamics build up?
A:-Roll moment is induced because rudder is offset from ship's vertical centre of gravity. Yes
itch moment is induced because rudder is offset from ship's vertical centre of gravity. No
C:-Incorrect statement
D:-(1) and (2)
Correct Answer:- Option-A
Question83:-For a moving ship rudder is more effective at the of a ship.
A:-Forward
:-Pitch
C:-Aft
0:-{1} २१५ (2)
Correct Answer:- Option-C