Tag: #ukmmarineengineering

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With reference to diesel engine crankshafts: (a) Explain the cause and effect of torsional vibration (4) (b) Explain the term critical speed, stating why the engine should not be continuously operated at this speed (6) (c) Explain the term fatigue cracking, stating with reasons, TWO factors which have an influence on the likelihood of fatigue…

EK Motor Dec 2020 (Q9)

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in EK Motor

(a) Describe how crosshead bearing and guide clearances can be checked (6) (b) Describe, with the aid of a sketch, the procedure for checking the condition of a crosshead engine bottom end bearing surface (10). Bearings Dec 2020 (Q9)

EK Motor Dec 2020 (Q8)

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in EK Motor

With reference to fatigue of engineering components: (a) Draw an S/N curve for steel, showing the Fatigue Limit and two representative stress-cycle conditions on the graph (4) (b) Explain how a component is designed to avoid fatigue failure, using the S/N curve drawn in part (a) (4) (c) Explain how poor maintenance and incorrect machinery…

EK Motor Dec 2020 (Q7)

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in EK Motor

(a) Explain why charge air coolers are fitted to turbo-charged diesel engines, stating the possible effect on engine and performance if they are not maintained in good condition (6) (b) As Chief Engineer Officer, write instructions for the routine in-service checking of charge air cooler performance and cleanliness together with the checking of condensate draining.…

EK General Dec 2022 (Q8)

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With reference to tanks containing hydrocarbon liquids and vapors: (a) Define EACH of the following terms: (i) Explosive limits (2) (ii) Vapor pressure. (2) (iii) Flash point. (2) (b) explain how the atmosphere in cargo tanks containing varying percentages of flammable gas can be maintained in a safe condition at all times (4) Fire Dec…

EK General Dec 2022 (Q7)

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With reference to refrigeration systems. (a) Explain why undercooling of the refrigerant at the condenser outlet is desirable (3) (b) Describe, with the aid of a sketch, how a heat exchanger could be incorporated in the circuit to enhance undercooling (5) (c) Explain the possible consequences of the refrigerant having a dryness fraction at the…

EK General Dec 2022 (Q6)

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(a) Sketch an oily water separator that complies with current MARPOL regulations (5) (b) Describe a monitoring system that ensures that the oil discharge content is below the recommended maximum and that logs and retains data. Also mention any other measures to ensure that illegal discharges are prohibited (5) Bilge, OWS & ORB Dec 2022…

EK General Dec 2022 (Q5)

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With reference to centrifugal pumps. (a) explain how the internal condition may be assessed without having to dismantle the pump (3) (b) state the effects of misalignment between the driving motor and the pump (2) (c) describe with the aid of a sketch how misalignment may be corrected (5) Pumps & system Dec 2022 (Q5)

EK General Dec 2022 (Q4)

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(a) Sketch a hydraulic type of shaft coupling bolt. (4) (b) State the advantages of the arrangement in part (a) compared to conventional bolts. (3) (c) State THREE operational factors that may induce high stress in shaft coupling bolts. (3) Propeller, shafting & thrusters Dec 2022 (Q4)

EK General Dec 2022 (Q3)

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