Q7. A. Explain why centrifugal pumps cannot handle air or vapours to effect priming yet turbo- blowers operating on the same principle can.
B. If a vessel is fully laden, how may it be ascertained that the fire pump priming arrangements would operate satisfactorily in the ballast condition.
C. Explain a suitable method of priming suitable for a centrifugal pump.
Q7. With reference to Gear pumps used for lubricating oil transfer.
(a) Sketch and describe a gear type pump indicating the flow of fluid.
(b) state the materials that gear type pump components may be manufactured from.
(c) specify THREE applications that are suitable for the employment of gear type pumps.
Q1. With reference to centrifugal pumps and pumping systems. A) Under what conditions, a centrifugal pump require a priming device for pump to operate normally? B) Draw a neat graph and explain and the performance curves of a centrifugal pump.
Q5. A. Sketch a simple cross section through a single stage centrifugal pump with a fully shrouded single entry impeller, name the components of the pump and indicate the direction of fluid flow. B. Describe: - i. The function of the impeller and how suction is created by it; ii. The function of the volute casing. iii. State the material of each component of the pump. C. State the suction lift that may be expected.; D. State why some centrifugal pumps have: - A double volute casing; (ii) A diffuser ring
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