Class 2 (2nd Engineer) MEKM 📅 Dec 2019

Exam Question

A diesel generator when fitted in a machinery space which is periodically unmanned may be equipped with monitoring alarms of the exhaust temperatures. Discuss the relative merits of:

(a) Individual cylinder maximum exhaust temperature alarms;

(b) Individual cylinder maximum and minimum exhaust temperature alarms;

(c) Individual cylinder maximum exhaust temperature alarm and an alarm for any two cylinders exhaust temperatures deviating more than 35°C.

(d) Explain how arrangement (c) can be provided for.

Reference Answer

(a) Individual cylinder maximum exhaust temperature alarms:
An alarm for the maximum exhaust temperature in each cylinder is beneficial because it can provide an early indication of localized problems specific to an individual cylinder. Common causes include:
Blocked or sticking fuel injector.
Dripping injector nozzle causing afterburning.

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