Class 2 (2nd Engineer) SC&S 📅 Feb 2024

Exam Question

(a) What is Prismatic Co-efficient (CP). Derive the formula CP = Cb/Cm, where Cb = Co-efficient of fineness and Cm = midship section area co-efficient. (6)

(b) A watertight door is 1.2m high and 0.75m wide, with a 0.6m sill. The bulkhead is flooded with seawater to a depth of 3m on one side and 1.5m on the other side. Draw the load diagram and from it determine the resultant load and position of the centre of pressure on the door. (10)

Reference Answer

(a) Prismatic coefficient is the ratio of the volume of displacement to the product of length and area of the immersed portion of the midship section
Cb is the block co-efficient or co-efficient of fitness is the ratio of the volume of displacement to the product of length, breadth and draught
$$\because\space C_{b}\space=\space{{
abla}\over L\times B\times D}\:---\:1$$

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