Q1. (a) Sketch a Stress/Strain curve for a mild steel test specimen. (2)
(b) With reference to the curve sketched in part (a), explain EACH of the following:
(i) Modulus of elasticity. (2)
(ii) Percentage elongation. (2)
(iii) Ultimate tensile stress. (2)
(iv) Yield stress. (2)
Q3. (a) Define propeller slip, explaining how it is calculated. (2)
(b) State, with reasons, FOUR conditions which will affect the propeller slip. (8)
Q5. With reference to centrifugal pumps
(a) Sketch double entry impeller showing directions of flow (3)
(b) Explain why double entry impellers are fitted (2)
(c) Explain, with the aid of a Head versus Flow diagram, why a two-speed pump is preferable to throttling where high and low capacities are demanded for a large sea water circulating pump. (5)
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