Q7. During recent months It has been necessary to frequently retighten some main engine holding down bolts as the steel chocks have become loose: (a) Explain possible reasons for this. (b) State with reasons why re-chocking using a different material might reduce the Incidence (c) Explain the possible consequences if the situation is allowed to continue unchecked.
Q7. a) Describe, with the aid of a sketch, a main engine holding down system explaining how the design features help prevent excessive stress in the holding down studs (8)
b) Describe, with the aid of a sketch, an engine top bracing arrangement, explaining why they are fitted and checked for operational performance (8)
Q2. With reference to behaviour of fabricated bed plates and frames in services:
A. Identify various forces imposed simultaneously upon them;
B. Explain how engine structure withstands these forces;
C. State how these forces are transferred to ship’s structure
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