Tag: #ekmanagmentwritten

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Describe, with the aid of a circuit diagram, the operation of a shaft generator that uses a frequency converter (10) Oct 2022 (Q9)

EK Electrical Jul 2022 (Q11)

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(a) Explain the principle of operation of an insulation resistance test, starting why the test is carried out on regular basis (6) (b) Describe how EACH of the following electrical tests is carried out (2) (i) Resistance (2) (ii) Continuity (2) Jul 2022 (Q11)

EK Electrical Jul 2022 (Q10)

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During a complete loss of electrical power, essential vital services can be maintained by means of an Uninterrupted power supply (UPS) (a) Describe, with the aid of a block diagram, the operation of an AC input UPS arrangement (7) (b) List SIX essential services that UPS may support. (3) Jul 2022 (Q10)

EK Electrical Jul 2022 (Q9)

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With reference to the paralleling and load sharing of A.C. generators: (a) State the requirements for synchronization; (3) (b) State how KW power is shared; (1) (c) State how Kvar power is shared; (1) (d) List the features that the Automatic Power Management System controls for the operation of main switchboards and generators when the…

EK Electrical Mar 2022 (Q11)

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With reference to lithium-ion batteries: (a) Explain why this type of batteries has been adapted for shipboard use (4) (b) State ONE advantage and ONE disadvantage of lithium-ion batteries (2) (c) Define EACH of the following terms (i) Cell drift (2) (ii) Thermal runaway (2) Mar 2022 (Q11)

EK Electrical Mar 2022 (Q10)

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Describe how the starting torque of electric induction motors may be improved using EACH of the following (a) Wound rotor (5) (b) Double cage (5) Mar 2022 (Q10)

EK Electrical Mar 2022 (Q9)

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(a) Sketch a circuit showing how the emergency generator is started, connected to the emergency busbar and how the main busbars are disconnected in the even 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) Mar 2022 (Q9)

EK Electrical Dec 2021 (Q11)

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(a) Explain, with the aid of a sketch, the principle of operation of an earth leakage detection system of the instrument type (6) (b) Explain why an insulated neutral system is used extensively on board ships (2) (c) State, with reasons, why a single earth fault on an insulated neutral system should always be cleared…

EK Electrical Dec 2021 (Q10)

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With reference to AC induction motors (a) State, with reasons, the type of fuse used for protection (2) (b) Explain the effects of single phasing (3) (c) Describe how thermistors can be used to protect the motor (3) (d) State TWO types of relay that provide electrical overload protection (2) Dec 2021 (Q10)

EK Electrical Dec 2021 (Q9)

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