SHIP CONSTRUCTION DECEMBER ONLINE QUESTIONS

SHIP CONSTRUCTION & STABILITY

DEC 2012

1) Find TPC when offset of water plane is as follows:

 Station AP 2 3 4 5 FP

??Breadth (m) 0.9, 1.5, 2.1, 1.6, 0.9, 0.1

Length of water plane is 15 meters.

a) 0.2 b) 0.3 c) 0.4 d) 0.5

2) What does D5 mean in shell plating?

Ans: Fourth strake from keel & fifth shell from aft

3) GM of ship will change with

a) Shifting of weight longitudinally

b) Shifting of weight transversely

c) Shifting of weight vertically

d) All of the above

4) Find coefficient of water plane area

Station AP 2 3 4 FP

B (m) 0.6, 1.1, 1.6, 0.9, 0.1

Length is 15m.

a) .82 b) .72 c) .62 d) .52

5) What is the purpose of camber?

Ans: For draining water from the deck

6) Diagram question

7) Diagram question

8) Modern medium to large size single side skin bulk carriers have long framing within double bottoms, within hopper tanks & decks while side shell is transversely framed. Why?

Ans: This is required for transverse strength. (I chose this option)

9) Minimum no. of intercoastal girder in transversely framed double bottom of ship whose breadth is more than 10m but less than 20m.

a) 1 (

b) 2

c) 3

d) 4

10) Hull plating strakes are generally numbered as

Ans: from keel to deck alphabetically up & aft to forward numerically up

11) Velocity of advancement is defined as

a) velocity of ship

b) don’t remember, but surely  this option is not the ans

c) axial velocity of propeller in water(something like dat)

d) axial velocity of propeller wrt a fixed object

12) What is must in a shaft tunnel

 a) Drainage well

b)  water tight door

 c) escape route to deck

 d) all of the above

13) Horizontal web plates which support the part of stern formed by radiused plates, between deck, is known as

a) panting stringer

b) breast stringer

c) breast hook

d) breast stiffener

14) Longitudinally framed double bottom, in frame spaces where there are no solid floors the bracket on the sides & center of girder should not be more than _____ apart

a) 2.5m

b) 3.7m

c) 3.8m

d) 1.25m

15) Length=150m, Breadth=30m , draught=10m , Cb=0.84 , Cm=0.92 . A continuous 30m length is added at midship section. Calculate new Cb ______ and Cm _____

a) 0.925

b) 0.9

c) 0.875

d) .85

Note: Cm remains the same

16) Double bottom compartment test

a) hose test

b) By filling them to maximum level

c) With a head of water upto the top of the air pipe

d) None

17) A vessel loaded to summer load line. Summer load line Displacement= 15,000 t, TPC=26.2, ship’s mean draft= 6.2 m. Ship is going in Winter Region…what is the New Displacement?

a) 14112.3

b) 14878.8

c) 14655.1

d) 14321.9

18) Find Cwp & TPC. Length = 14m

Station  AP  1  2  3  4  FP

Breadth (m) 1.0  1.44  1.55  1.33  0.89  0.2

a) 0.56

b) 0.34

c) 0.43

d) 0.65

19) Peak tank is tested by

a) hose test

b) Filled upto load waterline

c) 2.44m above….

d) none

20) Minimum possible no. of watertight bulkheads in ships with machinery space amidships is

a) 4

b) 3

c) 2

d) 5

21) Purpose of bulbous bow

Ans: to improve propulsion efficiency

22) Weight of rudder is taken by

a) steering gear

b) rudder stock

c) rudder carrier bearing

d) locking pintle/////????

23) Why frictional resistance increases when draught increases

a) Deadweight of vessel increases

b) Length of waterplane increases

c) wetted surface area increases

d) temp of water reduces as draught increases

24) 5 years dry docking…one Dry docking

can be missed… if

a)  ABS is given all the necessary information’s about the ship

b) ship less than 15 years old

c)

d) good quality resistant paint in underwater hull

25) Plates used to connect stern frames to flat plate keel are called

a) shoe plate

b) coffin plate

c) stealer plate

d) boss plate