Class 2 (2nd Engineer) SC&S 📅 Oct 2019

Exam Question

What is Prismatic Co-efficient (Cp).

(a) Derive the formula Cp = Cb/Cm, where Cb = Co-efficient of fineness and Cm = midship section area co-efficient.

(b) The length of a ship is 18 times the draught, while the breadth is 2.1 times the draught. At the load water plane, the water plane area co-efficient is 0.83 and the difference between the TPC in sea water and the TPC in fresh water is 0.7. Determine the length of the ship and the TPC in fresh water.

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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