Class 2 (2nd Engineer) MEKM 📅 Nov 2023

Exam Question

(a) Explain the possible reasons T/C vibration while operating at a steady speed. (3)

(b) State how the incidence of turbo charger vibration might be minimized. (3)

(c) Explain the action to be taken in order to maintain 2 stroke engine operation in the event of turbo charger having to be taken out of service. (6)

(d) Indicate the effect this action will have on engine operation. (4)

Reference Answer

(a) Possible reasons for Turbocharger vibration while operating at steady speed:
Accumulated dirt or deposits on turbine blades or compressor impellers can cause an imbalance in the rotating assembly.
Turbine blades or lashing wires may be damaged due to wear, fatigue, or foreign object impact.
A loose or improperly secured blower impeller can create uneven rotation and vibrations.

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