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Class 2 (2nd Engineer) MEP 📅 Jul 2018

Exam Question

During normal engine operation a turbocharger rapidly loses speed and the speed reduction is accompanied by appreciable noise.

(a) State, with reasons, the possible causes.

(b) Explain in detail how the engine might be safely operated if the damage causes by this incident is such that the turbocharger cannot function.

(c) State, with reasons, the factors. which may limit engine operating speed with a turbocharger out of action.

Reference Answer

(a) Causes of Rapid Loss of Turbocharger Speed with Noise (4 marks)
Mechanical Damage to Internal Components such as turbine blades, diffuser blades, or bearings may fail partially or completely. This can cause metal fragments to damage the casing, leading to rapid speed loss and increased noise.
Contamination by Impurities such as Dust, ash, or other impurities entering the turbocharger housing can collide with moving parts, causing vibrations, noise, and speed reduction.
Insufficient lubrication or bearing damage may result in high friction, overheating, and rapid deceleration of the turbocharger.

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