Tag: #ukmmarineengineering

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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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Describe with the aid of a circuit diagram, the operation of an automatic voltage regulator, which employs the use of thyristor (10) Dec 2021 (Q9)

EK Electrical Oct 2021 (Q11)

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With reference to insulation testing of electric equipments: (a) State the reasons for insulation testing and why it is carried out on regular basis (2) (b) Describe the procedure for taking a set of insulation readings on an electric motor in situ, stating the minimum acceptable readings (6) (c) Explain the term Polarisation Index. (2)…

EK Electrical Oct 2021 (Q10)

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(a) State the consequences of using a DOL starters for comparatively large sized AC induction motors (2) (b) Describe, with the aid of a sketch, an electronic soft starting system that may be used for large sized AC induction motors (8) Oct 2021 (Q10)

EK Electrical Jul 2021 (Q11)

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(a) With reference to battery systems for emergency purposes, explain the precautions that must be taken with regards to personnel safety, storage and maintenance (7) (b) Explain how batteries are kept at the correct rate of charge (3) Jul 2021 (Q11)

EK Electrical Jul 2021 (Q10)

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With reference to the protection of electrical equipment in a distribution system (a) State the aims of the protection devices. (3) (b) List the parameters that are monitored and acted upon by the protection devices (4) (c) State, with reason, THREE causes of electrical fires (3) Jul 2021 (Q10)

EK Electrical Jul 2021 (Q9)

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