NA & Ship Co Quiz II

1. Plating on bulk heads are generally fitted _______ for better graduation of thickness

Vertically in bulk heads

horizontally in bulk heads

vertically in transverse bulk head only

Horizontally in transverse bulk head only

2. Relation between CB, CP and CM is

C_P= C_B* C_M

C_M= C_P* C_B

C_M* C_P* C_B=1

C_B= C_P* C_M

3. Hull model relation is based on ______

Reynolds no of both hull and model are equal

Fraud’s no of both hull and model are equal

Reynolds and Fraud no of both hull and model are equal

None

4. Inorder to calculate the TPI of a vessel, for any given draft, it is necessary to divide the area of the waterplane by __________.

35.0-r.

120.0.

240.0.

420.0.

5. The ship's model estimates the __________.

Hull Frictional Resistance

Hull Wave Making Resistance

All the above

None of the above

6. Position of centre of buoyancy of vessel is at

Centroid of the full cargo space

Centroid of underwater hull

Centroid of all masses

Centroid of hull where buoyancy is maximum

7. Adding the FSCL to KG yields __________.

KM

GM

KGT

KGL

8. Subtracting FSCT from KGT yields __________.

BL

GMT

FSCT

KG

9. Many vessels are provided with flume tanks, which also have a dump tank located under the flume tanks. In the event the ship is damaged, you could dump the flume tanks into the dump tank which would __________. Uscg 1661 deck safety

reduce the free surface effect and raise the KG

not have any effect on free surface and raise the KG

reduce the free surface effect and lower the KG

not have any effect on free surface and lower the KG

10. That center around which a vessel trims is called the __________.

tipping center.

center of buoyancy.

center of gravity

turning center

Show Answers:

1-horizontally in bulk heads;
2-C_B= C_P* C_M;
3-Reynolds and Fraud no of both hull and model are equal ;
4-420.0;
5-All the above;
6-Centroid of underwater hull ;
7-KGL;
8-KG;
9-reduce the free surface effect and lower the KG;
10-tipping center.

NA & Ship Co Quiz I

1. After transferring a weight forward on a vessel, the draft at the center of flotation will :________

change, depending on the location of the LCG

increase

decrease

remain constant

2. The pillar shape that gives the greatest strength for the least weight is the :_______

octagonal pillar

"H" Beam pillar

"I" Beam pillar

circular type pillar

3. by using which of the tank we can change the draft but not changing trim of the ship?

peak tank

DB tank

deep tank

top side tank

4. A tank 36 ft. by 36 ft. by 6 ft. is filled with water to a depth of 5 ft. If a bulkhead is placed in the center of the tank running fore-and-aft along the 36-foot axis, how will the value of the moment of inertia of the free surface be affected?

The moment of inertia would remain unchanged.

The moment of inertia would be 1/4 its original value

The moment of inertia would be 1/2 the original value

None of the above

5. The average of the forward and after drafts is the __________.

mean draft

true mean draft

mean of the calculated drafts

draft at the center of flotation

6. The GM of the ship will change with_______

shifting of weight longitudinally

shifting of weight transversely

shifting of weight vertically

all the above

7. Which statement about the free surface correction is TRUE

It is added to the uncorrected GM to arrive at the corrected available GM

It is obtained by dividing the free surface moments by 12 times the
volume of displacement

It is obtained by dividing the total free surface by the total vertical moments

It is subtracted from the total longitudinal moments before dividing by displacement to find LCG

8. a section of standard weight seamless steel pipe has an external diameter of 4.0 inches .when the pipe is bent into 90 degree turn ,the length of the outside edge of the curve A-B will exceed the length of the inside edge curve C-D by _______ inch.

1.05

1.25

2.67

6.28

9. The lower and the upper stools are provided for bulk carriers

with plate type of transverse watertight bulkheads and they normally extend athwartship from ship side to ship side

with corrugated type of transverse watertight bulkheads and they normally extend athwartship from ship side to ship side

with plate type of transverse watertight bulkheads and they normally extend athwartship from one side lower hopper to other side lower hopper

with corrugated type of transverse watertight bulkheads and they normally extend athwartship from one side lower hopper to other side lower hopper

10. Better freeing arrangements on tanker decks inform of open rails for 50% of length are provided

To ensure no seawater gets into the tanks.

Because tankers have less freeboard.

Both A and B

None of the above

Show Answers:

1-remain constant;
2-circular type pillar;
3-DB tank;
4-The moment of inertia would be 1/4 its original value;
5-mean draft;
6-all the above;
7-It is obtained by dividing the free surface moments by 12 times the volume of displacement;
8-6.28;
9-with corrugated type of transverse watertight bulkheads and they normally extend athwartship from one side lower hopper to other side lower hopper;
10-Because tankers have less freeboard.

Latest Jobs In Goa Shipyard || GOA

Adv Ref No : 02/2017
Grade Name : Kindly refer our detail Advt. 02/2017 and corrigendum
Pay Scale : Kindly refer our detail Advt. 02/2017 and corrigendum
Job Titles :
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ASSISTANT MANAGER (HULL) || Goa Shipyard

Adv Ref No : 02/2017
Post ID : 02/2017/13
Job Title : ASSISTANT MANAGER (HULL) - (ON FIXED TERM BASIS FOR 3 YEARS)
Grade Name : E1
Pay Scale : 16400-3%-40500
Job Overview :
Essential Educational Qualification: Candidates should have Bachelor of Engineering (B.E.) / Bachelor of Technology (B. Tech.) in Naval Architecture from a recognized University / Institution with minimum First class or 60% marks or equivalent CGPA.
Other Information :
Essential Educational Qualification: Ex- Navy/ CG, retired as MCPO or equivalent grade. Desirable Qualification: Any advanced / additional Diploma / Certificate Course from a recognized University / AICTE approved institution in Manufacturing Technology / Production Engineering. Essential Work Experience: Hands on experience of minimum 10 years in hull systems, deck equipment, LSA/ FFA etc. In case of Govt./PSU minimum 01 year in the pay scale of ? 12600-3%-32500/- (IDA). Desirable Experience: Relevant managerial work experience in Hull Outfit areas like Fitting / alignment / welding etc., in ships/submarines production industry.
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MANAGEMENT TRAINEE (NAVAL ARCHITECTURE) || Goa Shipyard

Adv Ref No : 02/2017
Post ID : 02/2017/23
Job Title : MANAGEMENT TRAINEE (NAVAL ARCHITECTURE)
Grade Name : E1
Pay Scale : 16400-3%-40500
Job Overview :
Essential Educational Qualification: Candidates should have Bachelor of Engineering (B.E.) / Bachelor of Technology (B. Tech.) in Naval Architecture from a recognized University / Institution with minimum First class or 60% marks or equivalent CGPA.
Other Information :
CONDITIONS FOR MANAGEMENT TRAINEE POSTS:
Candidates studying the Final Year may also be considered for training, provided they get at least 60% or more (aggregate marks till the Last semester) as decided by the Management. However before joining the Company they should complete their final year in 1st class. Candidates will be short listed for calling for written test based on their performance/result/grading/ percentage as declared by the respective University. The selected candidate will undergo “On the Job training” for a period of one year which may be extended if necessary. During the training period the candidate will be paid a basic pay of ? 16,400/- per month in the pay scale of ? 16400-3%-40500 (E-1 grade) plus other allowances / benefits as applicable to Management Trainees in accordance with the GSL policy. On satisfactory completion of training, based on the company’s requirement and depending upon the performance during the training period, they may be considered for absorption as Assistant Manager in the E-1 grade carrying pay scale of ? 16400-3%-40500 or its equivalent as revised from time to time on Fixed Term Employment basis for a period of 3 years which can be further extended upto another two years or as per the Fixed Term Employment policy in vogue. On satisfactory completion of the training and on absorption in the Assistant Manager grade on fixed term employment, they will be given one increment in the scale. All Management Trainees considered for absorption as Assistant Manager will be on probation for a period of one year from the date of absorption as Assistant Manager. The period of 01 year as Management Trainee (or extended period as Management Trainee) will not be counted as service and for other consequential service benefits.
Education Requirment :
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How to apply :
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OBJECTIVE

To determine the Lightship Particulars of the vessel, which include Lightship displacement and center of gravity (VCG, LCG) of the vessel.

PREPARATIONS

1.      Minor items to go onboard and off board shall be identified and minimized. Details like weight, LCG, VCG of those items to be collected. Trim of the vessel should be minimized.


2.      All tanks are preferred to keep empty. In case of practical difficulties with some of the tanks, they can be kept pressed full. Sounding table should be available for slack tanks. Number of slack tanks should be minimized to reduce the effect of FSM.


3.      The depth of water under the hull should be sufficient to ensure that the hull will be entirely free of bottom. Prior to the experiment the water depth is to be measured. The mooring ropes will be loose enough for easy movement of the vessel.


4.      Weight transfer: As a minimal prerequisite for acceptability, the following conditions would be required:


a.       Sand Bags or Iron weights with pre-weighted weights will be used for inclining experiment. The final weight will be confirmed before inclining experiment.


b.      The weights will be divided in to four (4) groups of equal weights in each group and to be kept on main deck at same transverse distance from longitudinal centerline of main deck.


c.       Mechanical shifting for the weights will be used.


d.      All inclining weights would be recorded before and after each shift and longitudinal and transverse centers should be calculated for each movement.


e.       The ship’s initial heel and trim angle should be established prior to the inclining. The draft marks (port and starboard) should be used when establishing the initial heel angle.


f.       The time to conduct the inclining would be evaluated.


5.      Two pendulums (one fwd and one Aft of the vessel) shall be used to measure the deflection of the vessel. The length of the pendulums should be long enough to get accurate results. Pendulum wire should be of piano wire or other monofilament material. One small tank filled with viscous oil to be arranged below each pendulum to dampen the movement of the pendulum bob. A calibrated batten or paper shift shall be arranged on both the tanks to measure the deflection of pendulum string.


6.      A small boat shall be available to aid in taking the draft mark reading.

ESTIMATION OF LIST ANGLE

Weight transfer details:

Transfer of weights:                             X kg. Required per shift
Total inclining weight required:          4X kg.

List measurement:

Two pendulums installed one Aft and one Fwd for measuring the list of the vessel. Piano wires should be used to hang the pendulum. Calibrated battens or paper shifts are fixed on the tanks filled with viscous oil for damping.

Estimated List Angle:

Estimated list angles during shift 1 and 2 are ____ and ___ degree respectively.

Pendulum details:

Aft pendulum: 

Location - Fr. ___
Length - _____ mm

Fwd pendulum:

 Location - Fr.___
 Length - ______ mm

Both the pendulums should be located at the Centerline of the vessel
Anticipated pendulum reading will be about ___ mm (each shift) and ___ mm (total shift) respectively for various shifts for above pendulum length.

PROCEDURE

Initial Walkthrough and Survey:

The person responsible for conducting the inclining test should arrive on board the ship well in advance of the scheduled time of the test to ensure that the ship is properly prepared for the test. If the ship to be inclined is large, a preliminary walk through may need to be done the day preceding the actual incline. To ensure the safety of personnel conducting the walk through, and to improve the documentation of surveyed weights and deficiencies, at least two persons should make the initial walk through. Things to check include: all compartments are open, clean, and dry, tanks are well ventilated and gas free, movable or suspended items are secured and their position documented, pendulums are in place, weights are on board and in place, a crane or other method for moving weights is available, and the necessary plans and equipment are available

Experiment Procedure:

Four groups of weights weighing X kg each will be kept on either sides of the vessel (port and starboard).
The width of the vessel at main deck is __ m. The center-to-center distance between the weights to be shifted transversely would be about __ m. The weights will be re arranged accordingly subject to availability of empty space and in same line in longitudinal direction. The centerline of the weights will be at about 1.5 m from longitudinal centerline of the vessel.
Once the vessel is ready for the experiment the draft readings of the vessel to be noted using the small boat arranged for the same. The specific gravity of the seawater is also measured using hydrometer. Now the initial reading can be marked on the paper strip fixed perpendicular to the fore and aft pendulum of the vessel [initial] reading should be marked on paper shift at the same time.

WEIGHT SHIFT SEQUENCE

Let each weight be X kg.

Reading 0

	Aft side	Fore side
Port  Side	X	X
Starboard Side	X	X

Reading 1

	Aft side	Fore side
Port  Side	X	0
Starboard Side	X	2X

Reading 2

	Aft side	Fore side
Port  Side	0	0
Starboard Side	2X	2X

Reading 3

	Aft side	Fore side
Port  Side	0	X
Starboard Side	2X	X

Reading 4

	Aft side	Fore side
Port  Side	X	X
Starboard Side	X	X

Reading 5

	Aft side	Fore side
Port  Side	X	2X
Starboard Side	X	0

Reading 6

	Aft side	Fore side
Port  Side	2X	2X
Starboard Side	0	0

Reading 7

	Aft side	Fore side
Port  Side	2X	X
Starboard Side	0	X

Reading 8

	Aft side	Fore side
Port  Side	X	X
Starboard Side	X	X

 

CALCULATION PROCEDURE

A shift of inclining weight or in other words an inclining moment due to such a shift may be related to a ships stabilizing moment as follows.

w x d = Δ x GM Tan θ (1)

Of all the quantities in the above equation, only GM is the unknown.

Thus,

GM = w x d /( Δ x Tan θ) (2)

This is the governing equation for an inclining experiment. Thus we relate the inclining moment w x d to GM and isolate GM from the exercise. Once GM is known, we may easily deduce KG (VCG) by relating the height of metacenter KM to GM as

KM = KG + GM (3)

KM can be obtained from the hydrostatic tables. GM is deduced as explained earlier. The KG can be determined as

KG = KM – GM (4)

This KG is the effective KG inclusive of the weights to go off board. This KG is corrected for,

i. Weights to go off board

ii. Weights to go onboard

iii. Weights to be re located

This will yield the actual lightship particulars of the ship. The weights to go off board shall consist of people onboard, any equipment to be offloaded, partially or fully filled tanks and the inclining weights (if a tank is partially filled its weight & FSM shall be deducted). The weights to go onboard shall contain those things that are part of the ship but currently off board.

DATA ACQUISITION

All data acquired during the test should be initialized by both the person conducting the test as well as the surveyor as an indication of their mutual agreement on the data. The following data are to be recorded and presented.

Before inclination experiment

1. Detail of inclining weights (LCG, VCG and TCG)
2. Distance of shift
3. Sequence of shift
4. Length, location of pendulums
5. Condition of tanks
6. Weights to go off board, onboard.
7. No. of persons present.
8. Draft mark location and distances from AP and FP.
9. Location of AP and FP.

Start of Inclination experiment

1. Draft readings
2. Condition of mooring ropes
3. Density of water
4. Temperature
5. Weather condition like wind etc.

During inclination experiment

1. Pendulum deflection for each shift duly numbered and identified with pendulum

After inclination experiment

1. Density of water.
2. Draft readings.

CALCULATION SHEET - I

Deflection readings:

Pendulum readings were marked on the batten boards. Initial positions were also marked. After each movement of the weights, pendulum deflection readings were recorded. The vessel was verified to be floating free before recording the pendulum readings.

Deflection of each of the three pendulums was measured. The measured deflections and the calculated tangents are shown below table below.

Based on final average Tangent value of all 8 readings, the GM and then KG values are calculated as mentioned earlier.

Shift	P	S	Weight(P)	Weight(S)	Dist	Def	tanθ	GMT
			t	t	M	M	-	m
0	2,4	1,3
1	4	1,2,3
2	-	1,2,3,4
3	1	2,3,4
4	1,3	2,4
5	1,2,3	4
6	1,2,3,4	-
7	2,3,4	1
8	2,4	1,3

 

CALCULATION SHEET - II

Lightship Calculation:

From the calculated vessel displacement and the calculated CG, corrections were made for the weights to deduct, weights to add and weights to relocate, to arrive at the lightship weight from the incline as per following table.

Description	Weight	LCG	TCG	VCG	Lmom	Tmom	Vmom
	t	m	m	m	t-m	t-m	t-m
Lightweight
Inclining Weight4
Inclining Weight3
Inclining Weight2
Inclining Weight1
Men on Board
Displacement

Hydrostatics at inclining condition:

Trim		m
LCB		m
MCT 1cm		tm/cm
Def		m
Heel (per shift)		deg
Length of Pend		m
GM		m
KMT		m
KG		m