Tag: #ukmmarineengineering

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(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) Dec 2023 (Q9)

EK Electrical Oct 2023 (Q11)

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With reference to large electrical transformers on board ships (a) State where these transformers may be used (1) (b) State a typical efficiency range for a transformer (1) (c) State the regulations pertaining to transformers (3) (d) State the protective devices that are fitted (2) (e) Describe the maintenance requirements (3) Oct 2023 (Q11)

EK Electrical Oct 2023 (Q10)

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With reference to voltage variation profiles caused by load changes imposed on alternating current generators when starting large motors on line: (a) Sketch a voltage dip, showing an acceptable recovery time (2) (b) State FOUR salient factors that cause the variation in part (a) (4) (c) Outline FOUR salient factors that assist recovery from the…

EK Electrical Oct 2023 (Q9)

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operating in parallel (a) Explain why traditional reverse power relays, operating on mechanical principles, have been replaced by electronic digital microprocessor types (2) (b) Describe, with the aid of a sketch, a generator reverse power protection circuit that uses an electronic phase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

EK Electrical Jul 2023 (Q11)

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With reference to testing High Voltage equipment: (a) Explain why earthing down is considered essential (2) (b) State the operating voltage for an insulation resistance tester (megger) suitable for 6.6KV equipment (1) (c) Describe how an insulation resistance test is carried out on High Voltage equipment making reference to personnel safety (5) (d) Explain why…

EK Electrical Jul 2023 (Q10)

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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) Jul 2023 (Q10)

EK Electrical Jul 2023 (Q9)

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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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