** SECTION – 4**

**SECTION – 4**

**Position of center of buoyancy of a box shaped barge is at****Half of the draught;****Half of the depth of the hull****All of the above****None of the above**

**ANS.: A**

**2. Which of the following statements is False? **

**A collision bulkhead must be fitted on all types of ships.****An after peak bulkhead must be fitted on all types of ships.****One bulkhead at each end of machinery spaces must be fitted on all types of ships.****The aft peak bulkhead must extend to the upper deck**

**ANS.: D**

**Shedder plates are sometimes provided between, the corrugated bulkheads and lower stool shelf plates. The purpose of shedder plates is to:****Provide strength to the shelf plate****Reduce the unsupported span of corrugated bulkhead****Prevent piling up of dry cargo on horizontal portions of lower stool shelf plates****Reduce stress concentration at the connections of corrugated bulkheads to the lower stool shelf plates**

**ANS.: C**

**If the cause of severe list or trim is due to off center ballast, counter flooding into empty tanks will______________****increase the righting moment****increase the righting arm****increase list or trim****decrease list or trim**

**ANS.: D**

**Stability after the unintentional flooding of a compartment on a cargo vessel is called.****intact stability****initial stability****immersion stability****damage stability**

**ANS.: D**

**Keel scantlings of any vessel are greatest amidships because __________.****connections between forebody and afterbody are most crucial****of maximum longitudinal bending moments****of severest racking stresses****resistance to grounding is at a maximum amidships**

**ANS.: B**

**A thirty pound plate would be __________.****3/8″ thick****1/2″ thick****3/4″ thick****1″ thick**

**ANS.: C**

**The ceiling is __________.****the overhead in berthing compartments****a wooden protection placed over the tank top****material driven into seams or cracks to prevent leaking****None of the above are correct**

**ANS.: B**

**The wooden planking that protects the tank top from cargo loading is called__________.****ceiling****shores****frames****toms**

**ANS.: A**

**A set of interior steps on a ship leading up to a deck from below is known as______.****a companion way****tween-decks****stairs****All of the above are acceptable**

**ANS.: A**

**Hull-Model relation is based on:****Reynolds numbers of both Hull and Model are equal.****Froude numbers of both Hull and Model are equal.****Reynolds and Froude numbers of both Hull and Model are equal.****None of the above**

**ANS.: B**

**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.**

**ANS.: B**

**In order 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**

**ANS.: D**

**Wake is defined as****w= (PN- V_S)/V_S ;****w= (PN- V_a)/PN;****w= (PN- V_S)/PN;****w= (PN- V_a)/V_a ;**

**ANS.: B**