DieselShip's Online Content Library

Q1. Do you think that marine engineers should also be well versed about the concepts of Naval Architecture? Why?

Q2. The half-ordinates(m) of a waterplane, which are 6m apart, are given by: 11,16,24,84,39,42,47,52,40,23,26,46,13,23.

Calculate and compare the areas of waterplane as given by the 1,4,1 rule, the 1,3,3,1 rule and the trapezoidal rule

Q3. Outline the simple momentum theory for a propulsor. Show that the ideal efficiency is related to the axial and rotational inflow factors.

Q4. Just before entering drydock a ship of 5000 tonnes mass floats at draughts of 2.7 m forward and 4.2 m aft. The length between perpendiculars is 150 m and the water has a density of 1025 Kg/m3. Assuming the blocks are horizontal and the hydrostatic data given are constant over the variation in draught involved, find the force on the heel of the sternframe, which is at the after-perpendicular, when the ship is just about to settle on the dock blocks, and the metacentric height at that instant.

Hydrostatic data: KG = 8.5 m, KM = 9.3 m, MCT1 m = 105 MNm. longitudinal Centre of flotation(LCF) = 2.7 m aft of amidships.

Q5. A. Discuss how ship model can be used to determine ship resistance. B. How are the following used? i. The ITTC correlation line ii. Methodical series

Q6. A vessel of constant rectangular cross section is 60 m long and 10 m wide, it floats at a level keel draught of 3 m and has a Centre of gravity 2.5 m above the keel. Determine the fore and aft draughts if an empty, full width, fore-end compartment 8 m long is opened to the sea. For simplicity, a permeability of 100 per cent may be assumed. (solve using lost buoyancy method)

Q7. Discuss the various types of passenger vessel now in use.

Q8. When and why is an including experiment carried out? Discuss how it is carried out and the steps taken to ensure accurate results.

Q9. Define the following principal dimensions of ship: A. Length overall; B. Length on waterline; C. Length between perpendiculars; D. Forward perpendicular; E. After perpendicular; F. After sheer; G. Forward sheer; H. Upper deck at side; I. Amidships; J. Forward side of stern; K. Camber; L. Rounded gunwale; M. Tumble home; N. Rise of floor; O. Flat of keel; P. Bilge radius.