Q9. a) Sketch a circuit showing how the emergency generator is started, connected to the emergency busbars and how the main busbars are disconnected in the event of a blackout.(6)
b) Explain how an emergency generator can be tested to ensure that it is capable of satisfactorily delivering the rated power.(4)
Q10. Describe how the starting torque of electric induction motors may be improved by using EACH of the following:
(a) wound rotor; (5) (b) double cage. (5)
11. With reference to lithium-ion batteries:
(a) explain why this type of battery has been adopted for shipboard use; (4)
(b) state ONE advantage and ONE disadvantage of lithium-ion batteries; (2)
(c) define EACH of the following:
(i) cell drift; (2) (ii) thermal runaway. (2)
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