Tag: #ukmmarineengineering

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With reference to the protective devices fitted to a main alternating current generator, explain EACH of the following (a) Overcurrent and short circuit protection (2) (b) Generator negative phases sequence (2) (c) Loss of field (Excitation) (2) (d) Under voltage (2) (e) Reverse power (2) Generator & circuit protection Dec 2019 (Q9)

EK Electrical Oct 2019 (Q11)

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With reference to electrical short circuits: (a) State, with reasons, THREE factors that will influence the severity of a short circuit; (6) (b) Explain the role of reactance when selecting protective devices. (4) Electrical safety Oct 2019 (Q11)

EK Electrical Oct 2019 (Q10)

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(a) Describe the principle of operation of a ship’s Impressed Current Cathodic Protection system. (6) (b) State the routine maintenance that should be carried out on an Impressed Current Cathodic Protection system. (4) Control engineering Oct 2019 (Q10)

EK Electrical Oct 2019 (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) AC Generator Oct 2019 (Q9)

EK Electrical Jul 2019 (Q11)

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With reference to the protection of electrical power circuits: (a) Explain discrimination, describing how it is affected (5) (b) State, with reasons, the type of fuse used for protection (3) (c) Explain Preferential tripping (2) Generator & circuit protection Jul 2019 (Q11)

EK Motor Jul 2022 (Q9)

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in EK Motor

With reference to an economiser: (a) Write a procedure for the cleaning of the gas side of an economiser when the associated main engine is: (i) Running (5) (ii) Stopped (5) (b) Write a procedure for operation of the main engine when the associated economiser cannot be operated due to tube failure (6) Scavenging &…

EK Motor Jul 2022 (Q8)

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in EK Motor

(a) Explain why a diesel engine cylinder is supplied with excess air (4) (b) Explain why fuel droplet size produced during injection has to be within narrow limits in order to enable good cylinder combustion to be achieved (4) (c) Explain how the desired fuel droplet size is produced by fuel injections (4) (d) State…

EK Electrical Jul 2019 (Q10)

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With reference to three phase induction motor starters (a) Explain why star-delta starters are employed (2) (b) Explain what is meant by reduced voltage starting in context with star-delta starting (2) (c) Explain, with the aid of power circuit, the sequence of star-delta. (6) AC Starters Jul 2019 (Q10)

EK Electrical Jul 2019 (Q9)

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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 variations in part ‘a’ (4) (c) Outline FOUR salient factors that assist recovery from the…

EK Motor Jul 2022 (Q7)

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