Category: EK ELECTRICS

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With reference to main A.C. Generators: (a) State the immediate and subsequent actions to be taken in the event of a high windings temperature alarm being activated (8) (b) State the feature of the winding cooler tubes that prevent damage to the windings in the event of leakage (2) Jul 2023 (Q9)

EK Electrical Mar 2023 (Q11)

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(a) Explain the meaning of each of the following type of electric equipment (i) Intrinsically safe (2) (ii) Flame proof (2) (iii) Increased safety (2) (b) State the electrical test for equipments in hazardous areas, describing the safety precautions. (4) Mar 2023 (Q11)

EK Electrical Mar 2023 (Q10)

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With reference to the protection of High Voltage electric A.C motors: (a) State the type of fuse that are fitted and how they prevent single phasing (3) (b) Describe the operation of EACH of the following direct temperature sensors: (i) Resistance temperature device (3) (ii) Thermistor (4) Mar 2023 (Q10)

EK Electrical Mar 2023 (Q9)

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(a) Sketch a circuit diagram of a self excited a.c. generator. (5) (b) Describe the operation of the circuit sketched in part (a). (5) Mar 2023 (Q9)

EK Electrical Dec 2022 (Q11)

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(a) With reference to battery systems for emergency purposes, explain the precautions that must be taken with regard to personal safety, storage and maintenance. (7) (b) Explain how batteries are kept at the correct rate of charge (3) Dec 2022 (Q11)

EK Electrical Dec 2022 (Q10)

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Describe the construction and operation of EACH of the following: (a) Synchronous motor (5) (b) Induction motor (5) Dec 2022 (Q10)

EK Electrical Dec 2022 (Q9)

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(a) Explain the term power factor. (2) (b) Explain why it is detrimental to have a low power factor. (2) (c) Explain, with the aid of phasor diagrams, how a synchronous motor may be used to assist in power factor correction (6) Dec 2022 (Q9)

EK Electrical Oct 2022 (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 ship (2) (c) State, with reason, why a single earth fault on a insulated neutral system should be always be…

EK Electrical Oct 2022 (Q10)

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With reference to overload protection for electric motors, describe the principle of operation of EACH of the following types of overload relay: (a) Thermal (3) (b) Magnetic (3) (c) Electronic (4) Oct 2022 (Q10)

EK Electrical Oct 2022 (Q9)

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