Q9. (a) Define the term Torsional Vibration with respect to an engine crankshaft, stating the effect that high levels can have on an engine crankshaft.
(b) Explain how engine deterioration influences the risk of Torsional Vibration, stating what can be done to minimise that risk.
(c) Explain TWO possible reasons for the activation of a Torsional Vibration alarm after an engine has been started if there had been no previous history of such an alarm and if no maintenance had been undertaken on the engine whilst it was stopped.
Q5. (a) Explain the term torsional vibration, indicating the effect this can have on an engine crankshaft.
(b) Explain why a detuner/vibration damper might be fitted to an engine.
(c) Explain why an engine might have a barred speed range and why the engine should not be operated continuously in that range. (5)
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