Q5. With reference to centrifugal pumps:
(a) state the operating principle of a centrifugal pump and why it is unnecessary to fit a relief valve to it; (2)
(b) State TWO impeller types, explaining which type of application EACH would be best suited for; (4)
(c) Explain why cavitation occurs, and how it is reduced by design; (4)
Q8. The company, with which you are employed, requests that all Chief Engineer Officers prepare standing orders regarding the prevention and detection of fires in the machinery spaces. Compile such a list of recommendations to be submitted to central office. (10)
Q11. With reference to electrical short-circuits: (a) state, with reasons, THREE factors that will influence the severity of a short circuit; (6)
(b) explain the role of reactance when selecting protective devices. (4)
Q9. (a) Explain why it is necessary to provide reverse power protection for a.c. generators operating in parallel. (2)
(b) Sketch a generator protecting circuit. (5)
(c) Explain how to check the operation of the reverse power trip. (3)
Q14. (a) State the system of classification for access doors passing through watertight bulkheads of a vessel. (3)
(b) State THREE circumstances under which all watertight doors must be closed when situations are defined as potentially hazardous. (3)
(c) Explain the safety features built into the watertight door operating system to enhance safety to personnel. (4)
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