Category: EK GENERAL

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With reference to pneumatically operated control valves: (a) State FOUR reasons for fitting a valve positioner (4) (b) Explain valve hysteresis, stating how it affects the process (2) (c) State the immediate action to be taken to restore control upon failure of the positioner bellows (2) (d) State the difference between fail safe and fail…

EK General Oct 2021 (Q1)

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Explain the effects of the addition of EACH of the following alloying elements to improve the characteristics of steels: (a) Chromium (2) (b) Manganese (2) (c) Molybdenum (2) (d) Nickel (2) (e) Vanadium (2) Materials Oct 2021 (Q1)

EK General Jul 2021 (Q8)

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Describe the inspection and test that should be carried to ensure satisfactory condition and operation of the ship’s fire fighting equipment (10) Fire Jul 2021 (Q8)

EK General Jul 2021 (Q7)

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(a) Explain the principles of osmosis and reverse osmosis (4) (b) Describe how reverse osmosis is used for the production of fresh water onboard ship (4) (c) State the limitation of the quality of the permeate in a single pass reverse osmosis system, describing how the quality of the permeate could be improved (2) Cooling…

EK General Jul 2021 (Q6)

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Describe with the aid of a block diagram, a compensated control system for an active fin stabilization unit (10) Steering & stabilizers Jul 2021 (Q6)

EK General Jul 2021 (Q5)

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With reference to centrifugal pumps (a) State the operating principle of a centrifugal pump and why it is unnecessary to fit a relief valve to it (2) (b) State TWO impeller types, explaining which type of application EACH would be best suited for (4) (c) Explain why cavitation occurs and how it is reduced by…

EK General Jul 2021 (Q4)

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(a) Explain how power is transmitted through main shafting (2) (b) State FOUR operational factors that may induce high stress in coupling bolts (4) (c) Sketch a coupling bolt for improved design (4) Propeller, shafting & thrusters Jul 2021 (Q4)

EK General Jul 2021 (Q3)

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With reference to automatic control: (a) Sketch a pneumatic proportional plus integral controller (6) (b) Explain the term integral saturation (2) (c) Explain the action to be taken by the operator in the event of integral saturation occurring (2) Control system Jul 2021 (Q3)

EK General Jul 2021 (Q2)

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(a) Describe, with the aid of a sketch, an explosimeter for the detection of combustible gas (6) (b) Describe how the instrument sketched in part (a) is tested and calibrated (4) Control system Jul 2021 (Q2)

EK General Jul 2021 (Q1)

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