Category: EK ELECTRICS

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(a) Sketch a wiring diagram of a shore connection for the supply of electrical power to a vessel, showing the phase sequence indicator. (4) (b) Explain the consequences of connecting an electrical shore supply in EACH of the following cases: (i) In the wrong phase sequence; (2) (ii) At a higher voltage; (2) (iii) At…

EK Electrical Dec 2024 (Q10)

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Describe the construction and operation of EACH of the following: (a) Synchronous motor; (5) (b) Induction motor. (5) 10 marks Dec 2024, Dec 2022, Aug 2020 AC Motor Dec 2024 (Q10)

EK Electrical Dec 2024 (Q9)

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Describe, with the aid of a circuit diagram, the operation of an automatic voltage regulator (AVR) which employs the use of thyristors. (10) 10 marks Dec 2024, Dec 2021, Jul 2018 Generator & circuit protection Dec 2024 (Q9)

EK Electrical Oct 2024 (Q11)

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With reference to insulation testing of electrical equipment: (a) State the reasons for insulation testing and why it is carried out on a 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 2024 (Q10)

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(a) Describe, with the aid of a sketch, the constructional details of a squirrel cage rotor as fitted in an induction motor. (7) (b) Explain why some rotors have a double cage. (3) 10 marks Oct 2024, Jul 2023, Mar 2021 Electric motors Oct 2024 (Q10)

EK Electrical Oct 2024 (Q9)

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With reference to reverse power protection for a.c. generators operating in parallel: (a) Explain why traditional reverse power relays, operating on mechanical principles, have been replaced by electronic digital microprocessor types (2) (b) Describe, with the aid of a sketch, a generator reverse power protection circuit that uses an electronic phase sensitive detector. (8) 10…

EK Electrical Jul 2024 (Q11)

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(a) State FIVE essential electrical services that are able to be operable under fire conditions (5) (b) Explain how electric cables for essential services in part (a) pass through bulkheads whilst maintaining gas tight and water tight integrity (3) (c) State the requirements for the cables which supply electrically driven emergency fire pumps. (2) Electrical…

EK Electrical Jul 2024 (Q10)

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Describe, with the aid of a circuit diagram, a synchro-converter for the variable speed control of a.c. motors (10) Jul 2024 (Q10)

EK Electrical Jul 2024 (Q9)

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With reference to paralleling AC generators (a) Outline the requirement for synchronization (3) (b) Explain how KW power is shared (2) (c) Explain how KVar power is shared (1) (d) State SIX types of damage that may be caused when machines are incorrectly synchronised. (4) Generator & circuit protection Jul 2024 (Q9)

EK Electrical Mar 2024 (Q11)

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