Ship Structures and Strength - Naval Architecture and Ocean Engineering - Naval Architecture & Marine Engineering Previous Year Questions

1

2022 · Naval Architecture & Marine Engineering · Naval Architecture and Ocean Engineering · Ship Structures and Strength

Naval Architecture & Marine Engineering (NM) 2022

If a ship hull is subdivided into different watertight compartments, which of the following statements are TRUE?

A

It improves the ship stability in damaged conditions

B

It increases the ship hull strength

C

It reduces the ship intact stability

D

It provides more options to carry different types of cargo

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2

2022 · Naval Architecture & Marine Engineering · Naval Architecture and Ocean Engineering · Ship Structures and Strength

Naval Architecture & Marine Engineering (NM) 2022

Consider a ship with one half of its midship cross-section, as shown in the figure, with moulded breadth B of 30 m and moulded depth D of 9 m.
Assume the following:

• The deck, side shell and bottom plate have the same thickness
• The yield stress of the material is 240 MPa
• The section is subjected to a vertical bending moment of 712.8 MNm

Ignore the self-moment of inertia of the deck and bottom plating in calculations. The distance of the fiber farthest from the neutral axis can be considered excluding the plate thickness.
If the maximum bending stress is equal to the yield stress, then the plate thickness is ______ mm (rounded off to one decimal place).

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3

2023 · Naval Architecture & Marine Engineering · Naval Architecture and Ocean Engineering · Ship Structures and Strength

Naval Architecture & Marine Engineering (NM) 2023

A rectangular barge is freely floating in a drydock as shown in the following figure. For longitudinal strength analysis which of the following are TRUE?

A

The barge is considered as a free-free beam

B

At aft and forward ends: shear force = 0, bending moment = 0

C

The barge is considered as a fixed-fixed beam

D

At aft and forward ends: shear force ≠ 0, bending moment ≠ 0

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4

2023 · Naval Architecture & Marine Engineering · Naval Architecture and Ocean Engineering · Ship Structures and Strength

Naval Architecture & Marine Engineering (NM) 2023

A ‘T’ section is welded to the flat bottom shell plate of a ship as shown in the following figure (bottom shell longitudinal). The neutral axis of the ship’s midship section is 14 m above the bottom shell plate. The distance (X) of neutral axis of the ‘T’ section from the ship’s neutral axis is ______ m (round off to two decimal places)

A

12.63

B

13.63

C

15.24

D

11.24

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5

2024 · Naval Architecture & Marine Engineering · Naval Architecture and Ocean Engineering · Ship Structures and Strength

Naval Architecture & Marine Engineering (NM) 2024

Which of the following hull distortion(s) is/are resisted by a ship's transverse bulkhead?

A

Racking

B

Torsion

C

Longitudinal bending

D

Horizontal bending

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6

2025 · Naval Architecture & Marine Engineering · Naval Architecture and Ocean Engineering · Ship Structures and Strength

Naval Architecture & Marine Engineering (NM) 2025

The midship section of a barge of breadth W and depth H is shown in the figure. All plate thicknesses are equal. The barge is subjected to a longitudinal bending moment in the upright condition. Which one of the following statements is correct?

A

Magnitude of longitudinal bending stress is maximum at point P and magnitude of vertical shear stress is maximum at point Q.

B

Magnitude of longitudinal bending stress is maximum at point S and magnitude of vertical shear stress is maximum at point R.

C

Magnitude of longitudinal bending stress is maximum at point Q and magnitude of vertical shear stress is maximum at point S.

D

Magnitude of longitudinal bending stress is maximum at point R and magnitude of vertical shear stress is maximum at point P.

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7

2025 · Naval Architecture & Marine Engineering · Naval Architecture and Ocean Engineering · Ship Structures and Strength

Naval Architecture & Marine Engineering (NM) 2025

Consider a case where the load \( Q \) for a ship structure has only statistical uncertainties. The probability density function of the load \( p_Q(x) \) is shown in the figure. The characteristic limit value of the load (\( Q_{L_c} \)) is 1.5 and factor of safety is 1. Which of the following probability of exceedance value(s) of the load will lead to a safe design?

A

0.05

B

0.10

C

0.15

D

0.20

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8

2025 · Naval Architecture & Marine Engineering · Naval Architecture and Ocean Engineering · Ship Structures and Strength

Naval Architecture & Marine Engineering (NM) 2025

A freely-floating rectangular barge of length 200 m is divided into five equal compartments. In light-weight condition, the weight and buoyancy are uniformly distributed along the length of the barge. Assume g = 9.81 m/s².
If 500 tonne of liquid cargo is added to each of the two end compartments as shown in the figure, then the maximum bending moment is \_\_\_\_\_\_ MN-m (rounded off to two decimal places).

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9

2025 · Naval Architecture & Marine Engineering · Naval Architecture and Ocean Engineering · Ship Structures and Strength

Naval Architecture & Marine Engineering (NM) 2025

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 q₁ = q₂ = q₃ = 0.9376 MN/m. The applied twisting moment on the midship section is ______ MN-m (rounded off to two decimal places).

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10

2026 · Naval Architecture & Marine Engineering · Naval Architecture and Ocean Engineering · Ship Structures and Strength

Mining Engineering (MN) 2026

The firing sequence in a drivage is shown. The charge per hole for Sections 1, 2, and 3 are 2.0 kg, 3.0 kg, and 1.0 kg, respectively, and the delay between each section is 25 milliseconds. The maximum charge per delay, in kg, is

A

8.0

B

12.0

C

20.0

D

28.0

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11

2026 · Naval Architecture & Marine Engineering · Naval Architecture and Ocean Engineering · Ship Structures and Strength

Mining Engineering (MN) 2026

Results from the permeability test of rock samples, E, F, and G are shown. The correct order of hydraulic conductivity (k) of the rock samples is

A

$k_E > k_F > k_G$

B

$k_E < k_F < k_G$

C

$k_E = k_F = k_G$

D

$k_F > k_G > k_E$

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12

2026 · Naval Architecture & Marine Engineering · Naval Architecture and Ocean Engineering · Ship Structures and Strength

Mining Engineering (MN) 2026

The ideal load – deformation characteristic curve of a hydraulic prop is

A

P

B

Q

C

R

D

S

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13

2026 · Naval Architecture & Marine Engineering · Naval Architecture and Ocean Engineering · Ship Structures and Strength

Mining Engineering (MN) 2026

The expected time (P days) and standard deviation (Q days) of the different activities (A to F) in a project are indicated in the network diagram as (P, Q). The standard deviation of the project completion time, in days, is __________. (rounded off to one decimal place)

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14

2026 · Naval Architecture & Marine Engineering · Naval Architecture and Ocean Engineering · Ship Structures and Strength

Mining Engineering (MN) 2026

A regular shaped cut and fill stope is shown. Pillars of size 4 m × 4 m are left at an interval of 13 m along the length of the stope. If the density of the mined ore is 2.5 tonne m⁻³, and slices are extracted to the full stope width, the total tonnage of ore recovered from the 1ˢᵗ slice of the stope is ______ × 10³. (rounded off to one decimal place)

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15

2026 · Naval Architecture & Marine Engineering · Naval Architecture and Ocean Engineering · Ship Structures and Strength

Naval Architecture and Marine Engineering (NM) 2026

The weight of a ship is uniformly distributed along its length.
Under which ONE or MORE of the following conditions will the ship be subjected to hogging moment?
Note: The weight is equal to buoyancy in all of the following conditions.

A

When buoyancy per unit length is greater than weight per unit length amidships

B

When weight per unit length is greater than buoyancy per unit length in the bow and stern region

C

When the ship is on a single wave with its crest at midship and troughs at the bow and stern

D

When the ship is on a single wave with its crests at the bow, stern and the trough at midship

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