Correct Answer:- Option-D
Question55:-As per gas carrier ship regulation, the probability of exceeding permissible stress limit **<10~{-8}"" for
acceptable structural design. The permissible stress for mild steel is **235 N/fmm~2"" . There are two structural designs. In
‏۵۱ا۳٣ (ج)‎ (stress *>="""245 ۸۷/۳۱۲۰۸ ‏,٭'٭٭"(7.8۔) -10ھ(2‎ 2೧6 1
{b} Probability (stress * "235 N/mm~2)=10"{-9.2}".
Which one of the design is acceptable?

A:-Only (0)

B:-None of {a} and (b}

C:-Both (೩) 2೧6 (0)

D:-Only (a}

Correct Answer:- Option-A
Question56:-The fatigue load needs to be estimated corresponding to *"10°8"" wave encounters through the operating life
of a ship. For shipl ing steel, परी 5-11 ೧೬/೧ (variation of maximum permissible stress amplitude against number of load
cycles) characteristics shall be available till:

A:-Number of cycles: **10~ {12}

B:-Number of cycles:

C:-Number of cycles:

D:-Numbser of cycles:

Correct Answer:- Option-D
Question57:-A liquid hydrogen carier is designed for 500 thermal cycles during its service life. 5% of the thermal cycles,
correspond to cargo temperature to 45°C and the balance correspond to cargo temperature to -100°C. Cargo (Liquid
hydrogen) temperature -253°C. 45°C and -100°C temperatures may correspond to which operating conditions:

A:-45°C: Drydocking and -100°C: Ballast voyage, -253°C: loaded voyage

B:-45°C: Ballast voyage and -100°C: Drydocking, -253°C: loaded voyage

C:-(1} and (2}

D:-None of the above

Correct Answer:- Option-A
Question58:-A floating LNG terminal is designed to be permanently moored off the Nigerian coast. The probability of
occurrence of the waves (*"H_s"" (m, significant wave height)/ **T_p"* (sec, mean wave period)/p (probability)) are (a} 6.3 /
870.05 ‏(ع) 0.05 10 / 9.3 (ا)‎ 6.5 / 12 / 0.1 )8( 5.5 / 167 0.2 )۵( 7.4 / 16 0.05 ) 71.6/16/0.05 (6)1/32/0.25 (೧)2/12/
0.25. The design criteria is, probability (stress level > 235 **N/mm~2") <10~{-8}". Bending stress on the structure is
estimated by numerical simulation using random wave for each one of the above wave condition. The random wave 15
generated using the wave spectrum suitable for the geographical region. The probabilities (stress level *"> 235 N/mm~2""})
are estimated as *"p_1, p_2, p_3, p_5. p_6, p_4 = p_7 = p_8 = 0"". Write the mathematical expression (inequality) involving
"1... ‏"8م‎ .
"0 1 + 0 2+03+05 + 0 6 < 10^{-8}"`
1+ 02 +03+0 5 + 0 6 > 10^{-8}'
1۰ ‏3م ٭- 2م‎ 05५ 0 6> 10 [ളൂ

D:-None of the above

Correct Answer:- Option-A
Question59:-An offshore supply vessel has very low freeboard in its working deck and a buoyant superstructure at the
forward. The working deck gets immersed in water for low heel angles. The GZ curve is computed with "free to sink and trim"
and "fixed trim" condition. Which one of the GZ curve you will use for the designing the vessel?

A:-(2), (3)and (4)

B:-Both GZ curves will be same

C:-GZ curve computed with "fixed trim"

D:-GZ curve computed with “free to sink and trim"

Correct Answer:- Option-D
Question60:-As per gas carrier ship regulation, the empty independent tanks must be designed to endure antifloating
arrangement. Antifloating arrangement means:

A:-Buoyant force on independent tank > Weight of independent tank

B:-Buoyant force on independent tank < Weight of independent tank

C:-(1) and (2}

D:-None of the above

Correct Answer:- Option-A
Question61:-As per MARPOL Crude Oil washing system needs to be provided for the following ship type:

A:-Oil tanker

B:-Container ship

C:-Tug

D:-None of the above

Correct Answer:- Option-A